DRQ-12/50-L48NBA-C - MURATA MANUFACTURING

The DRQ 600W series provides a fully regulated,

digitally controlled DC output in a ¼-brick format

that will support the evolving Advanced Bus Con-

verter (ABC) industry standard footprint for isolated

board mounted power modules. The DRQ series

supports advances in power conversion technology

including a digital interface supporting the PMBus

protocol for communications to power modules.

The DRQ series offers high output current (up to

50 Amps) in an industry standard “quarter brick”

package. The DRQ series is an isolated, regulated,

600W-12Vout quarter brick that has an input range

of 44-60Vdc with a typical efﬁ ciency of 96%. The

DRQ-12/50-L48 is ideal for intermediate bus ap-

plications.

A digitally controlled version is also available

with the Advanced Bus Converter (ABC) pinout.

Advanced automated surface mount assembly

and planar magnetics deliver galvanic isolation

rated at 2250 Vdc for functional insulation. Target

markets include Networking Equipment, Power

over Ethernet applications, Wireless Network-

ing Equipment, Telecommunications Equipment,

Wireless pre-ampliﬁ ers, Industrial and test equip-

ment, 12V Fan trays and applications requiring a

regulated 12V output.

A wealth of self-protection features include input

undervoltage lockout and overtemperature shut-

down; over current protection using the “hiccup”

autorestart technique, provides indeﬁ nite short-

circuit protection, along with output OVP. The DRQ

series is certiﬁ ed to safety standards UL/IEC/CSA

60950-1, 2nd edition. It meets RFI/EMI conducted

emission compliance to EN55022, CISPR22 with an

external ﬁ lter.

PRODUCT OVERVIEW

APPLICATIONS

 Embedded systems, datacom and telecom

installations, wireless base stations

 Disk farms, data centers and cellular repeater sites

 Remote sensor systems, dedicated controllers

 Instrumentation systems, R&D platforms, auto-

mated test ﬁ xtures

 Data concentrators, voice forwarding and

speech processing systems

FEATURES

 Fixed DC outputs, 12V @ 50A

 Advanced Bus Converter industry standard

quarter-brick with digital PMBus™ interface

 Optional ﬁ ve pin version (DOSA compatible

pinouts)

 44-60 VDC input range

 Load sharing option

 Baseplate & heatsink options

 96% typical efﬁ ciency

 2250 VDC isolation

 Certiﬁ ed to UL 60950-1, CSA-C22.2 No. 60950-1,

2nd edition safety approvals

 Extensive self-protection, OVP, input undervolt-

age, current limiting and thermal shutdown

External

Power

Source

Reference and

Error Ampliﬁer

-Vout (4)

+Vout (8)

On/Off

Control

(2)

-Vin (3)

Open = On

+Vin (1)

logic)

Controller

and Power

Barrier

Figure 1. Connection Diagram (without digital interface)

Typical topology is shown. Murata Power Solutions recommends an external fuse.

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 1 of 26

www.murata-ps.com

www.murata-ps.com/support

For full details go to

www.murata-ps.com/rohs

Typical unitT

➀Please refer to the part number structure for additional ordering information and options.

➁All speciﬁ cations are typical at nominal line voltage and full load, +25°C unless otherwise noted. See

detailed speciﬁ cations. Output capacitors are 1 µF || 10 µF. These caps are necessary for our test equip-

ment and may not be needed for your application.

PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE ➀ ➁

Root Model ➀

Output Input

Efﬁ ciency Dimensions with heat sink

VOUT

(Volts)

IOUT

(Amps,

max.)

Power

(Watts)

R/N (mV

pk-pk)

Regulation

(mV, max.) VIN Nom.

(Volts)

Range

(Volts)

IIN no

load (mA)

IIN full

load

(Amps)Typ. Max. Line Load Min. Typ. (inches) (mm)

DRQ-12/50-L48

DRQ-12/50-L48 12 50 600 150 200 100 120 48 44-60 150 13.02 95% 96%

2.3 x 1.45 x 1.1

58.4 x 36.8 x 27.94

PART NUMBER STRUCTURE

Pin length option

Blank = Standard pin length 0.180 in. (4.6 mm)

L1 = 0.110 in. (2.79 mm)➀

L2 = 0.145 in. (3.68 mm)➁

L48

Input Voltage Range:

L48 = 44-60 Volts (48V nominal)

12 50 -N

On/Off Control Logic

N = Negative logic

P = Positive logic

DRQ

Digital Regulated

Quarter-brick

RoHS Hazardous Materials compliance

C = RoHS-6 (does not claim EU RoHS exemption 7b–lead in solder), standard

-C

Complete Model Number Example:

Negative On/Off logic, Integrated Heat Sink installed, 0.110˝ pin length, RoHS-6 compliance

DRQ-12/50-L48NKL1-C

A = PMBus™ (ABC 16-pin pinout)

Blank = No PMBus™ (DOSA 5-pin pinout)

S = Load-Sharing option

Nominal Output Voltage

Maximum Rated Output

Current in Amps

Baseplate or Integrated Heat Sink (optional)

B = Baseplate installed

K = Integrated Heat Sink

➀Special quantity order is required; samples available with standard pin length only.

➁Some model number combinations may not be available. See website or contact your local Murata sales representative.

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 2 of 26

www.murata-ps.com/support

NOTE: The following products are To Be Discontinued.

DRQ-12/50-L48PBA-C DRQ-12/50-L48PBSA-C DRQ-12/50-L48PKA-C DRQ-12/50-L48PKSA-C

DRQ-12/50-L48PBAL2-C DRQ-12/50-L48PBSAL2-C DRQ-12/50-L48PKAL2-C DRQ-12/50-L48PKSAL2-C

DRQ-12/50-L48PB-C DRQ-12/50-L48PBS-C DRQ-12/50-L48PK-C DRQ-12/50-L48PKS-C

DRQ-12/50-L48PBL2-C DRQ-12/50-L48PBSL2-C DRQ-12/50-L48PKL2-C DRQ-12/50-L48PKSL2-C

To Be Discontinued *

* Last Time Buy date is 3/31/2019. Please click here to view the Discontinuance Notification.

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 3 of 26

www.murata-ps.com/support

FUNCTIONAL SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS Conditions ➀Minimum Typical/Nominal Maximum Units

Input Voltage, Continuous 0 60 Vdc

Isolation Voltage Input to output, continuous 2250 Vdc

On/Off Remote Control Power on, referred to -Vin 0 13.5 Vdc

Output Power 0 612 W

Output Current Current-limited, no damage, short-circuit

protected 050A

Storage Temperature Range Vin = Zero (no power) -55 125 °C

Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those

listed in the Performance/Functional Speciﬁ cations Table is not implied or recommended.

INPUT Conditions ➀ ➂

Operating voltage range 44 48 60 Vdc

Recommended External Fuse Fast blow 25 A

Start-up threshold Rising input voltage 41 42 43 Vdc

Undervoltage shutdown Falling input voltage 39 40 41 Vdc

Overvoltage Shutdown 64 66 68 Vdc

Overvoltage Recover 62 64 66 Vdc

Internal Filter Type Pi

Input current

Full Load Conditions Vin = nominal 13.02 14.02 A

Low Line Vin = minimum 14.2 14.28 A

Inrush Transient 0.15 0.30 A2-Sec.

Short Circuit Input Current 0.05 0.1 A

No Load Input Current Iout = minimum, unit = ON 150 200 mA

Shut-Down Input Current (Off, UV, OT) 10 20 mA

Reﬂ ected (back) ripple current ➁Measured at input with speciﬁ ed ﬁ lter 100 180 mA, p-p

Pre-biased startup External output voltage < Vset Monotonic

GENERAL and SAFETY

Efﬁ ciency Vin = 48V, full load 95 96 %

Vin = min., full load 95.5 96 %

Isolation

Isolation Voltage Input to output, continuous 2250 Vdc

Isolation Voltage Input to baseplate, continuous 1500 Vdc

Isolation Voltage Output to baseplate, continuous 1500 Vdc

Insulation Safety Rating functional

Isolation Resistance 10 M

Isolation Capacitance 1500 pF

Safety Certiﬁ ed to UL-60950-1, CSA-C22.2 No. 60950-

1, IEC 60950-1, 2nd edition Yes

Calculated MTBF Per Telcordia SR332, issue 2, class 3, method 1,

ground ﬁ xed, Tambient = +25°C 3.2 Hours x 106

DYNAMIC CHARACTERISTICS

Fix Frequency Control 150 KHz

Vin Startup delay time Power on to Vout regulated 25 30 mS

Enable startup delay time Remote ON to Vout regulated 3 5 mS

Rise Time 15 20 mS

Dynamic Load Response 50-75-50% load step, settling time to within 1%

of Vout (Cout=3300µF) 200 250 µSec

Dynamic Load Peak Deviation same as above ±250 ±300 mV

FEATURES and OPTIONS

Remote On/Off Control ➃

“N” sufﬁ x:

Negative Logic, ON state ON = Ground pin or external voltage -0.1 0.8 V

Negative Logic, OFF state OFF = Pin open or external voltage 3.5 13.5 V

Control Pin Shutdown Current Open collector/drain 5 mA

Control Pin On Current 1mA

“P” sufﬁ x:

Positive Logic, ON state ON = Pin open or external voltage 3.5 13.5 V

Positive Logic, OFF state OFF = Ground pin or external voltage 0 0.8 V

Control Pin Shutdown Current Open collector/drain 1 mA

Control Pin On Current 5mA

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 4 of 26

www.murata-ps.com/support

OUTPUT Conditions ➀Minimum Typical/Nominal Maximum Units

Total Output Power 0 600 612 W

Voltage

Nominal Output Voltage No trim, all conditions 11.76 12 12.24 Vdc

Setting Accuracy At 50% load, no trim -2 2 % of Vnom

Output Voltage @Vin=48V, Iout=0, Ta=+25°C 11.95 12.05 Vdc

Overvoltage Protection Via magnetic feedback 13.8 14.4 15.6 Vdc

Current

Output Current Range 050A

Minimum Load

Current Limit Inception 90% of Vout, after warmup 56 58 60 A

Short Circuit

Short Circuit Current Hiccup technique, autorecovery within ±1.25%

of Vout 0.4 1 A

Short Circuit Duration

(remove short for recovery) Output shorted to ground, no damage Continuous

Short circuit protection method Current limiting

Regulation ➄

Line Regulation 40 100 mV

Load Regulation Iout = min. to max. 40 120 mV

Ripple and Noise ➅5 Hz- 20 MHz BW 150 200 mV pk-pk

Temperature Coefﬁ cient At all outputs ±0.02 % of Vout./°C

Maximum Capacitive Loading Low ESR 10,000 F

MECHANICAL (Through Hole Models)

Outline Dimensions with heat sink 2.3 x 1.45 x 1.1 Inches

(Please refer to outline drawing) LxWxH 58.4 x 36.83 x 27.94 mm

Outline Dimensions with baseplate 2.3 x 1.45 x .052 Inches

(Please refer to outline drawing) LxWxH 58.4x 36.83x 13.2 mm

Weight with heat sink 3.38 Ounces

96 Grams

Weight with baseplate 2.63 Ounces

74.5 Grams

Through Hole Pin Diameter 0.04 & 0.062 Inches

1.016 & 1.575 mm

Through Hole Pin Material Copper alloy

TH Pin Plating Metal and Thickness Nickel subplate 98.4-299 µ-inches

Gold overplate 4.7-19.6 µ-inches

ENVIRONMENTAL

Operating Ambient Temperature Range See Derating -40 85 °C

Operating Case Temperature No derating -40 110 °C

Storage Temperature Vin = Zero (no power) -55 125 °C

Thermal Protection/Shutdown Measured in center 135 °C

Electromagnetic Interference External ﬁ lter is required

Conducted, EN55022/CISPR22 B Class

RoHS rating RoHS-6

FUNCTIONAL SPECIFICATIONS, (CONT.)

Notes

➀Unless otherwise noted, all speciﬁ cations apply at Vin = nominal, nominal output voltage and full

output load. General conditions are near sea level altitude, no base plate installed and natural

convection airﬂ ow unless otherwise speciﬁ ed. All models are tested and speciﬁ ed with external

parallel 1 F and 10 F output capacitors (see Technical Notes). All capacitors are low-ESR types

wired close to the converter. These capacitors are necessary for our test equipment and may not

be needed in the user’s application.

➁Input (back) ripple current is tested and speciﬁ ed over 5 Hz to 20 MHz bandwidth. Input ﬁ ltering is

Cin = 33 µF/100V, Cbus = 220µF/100V and Lbus = 12 µH.

➂All models are stable and regulate to speciﬁ cation under no load.

➃The Remote On/Off Control is referred to -Vin.

➄Regulation speciﬁ cations describe the output voltage changes as the line voltage or load current

is varied from its nominal or midpoint value to either extreme. The load step is ±25% of full load

current.

➅Output Ripple and Noise is measured with Cout = 1 µF || 10 µF, 20 MHz oscilloscope bandwidth

and full resistive load.

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 5 of 26

www.murata-ps.com/support

PERFORMANCE DATA

Maximum Current Temperature Derating at sea level

(Vin = 48V, airﬂ ow from -Vin to +Vin, with heat sink)

Maximum Current Temperature Derating at sea level

(Vin = 60V, airﬂ ow from -Vin to +Vin, with heat sink)

Maximum Current Temperature Derating at sea level

(Vin = 44V, airﬂ ow from -Vin to +Vin, with heat sink)

Maximum Current Temperature Derating at sea level

(Vin = 54V, airﬂ ow from -Vin to +Vin, with heat sink)

40 50 60 70 80 85

Output Current (Amps)

Ambient Temperature

(°C)

0.5 m/s (100 LFM)

1.0 m/s (200 LFM)

1.5 m/s (300 LFM)

2.0 m/s (400 LFM)

40 50 60 70 80 85

Output Current (Amps)

Ambient Temperature

(°C)

0.5 m/s (100 LFM)

1.0 m/s (200 LFM)

1.5 m/s (300 LFM)

2.0 m/s (400 LFM)

40 50 60 70 80 85

Output Current (Amps)

Ambient Temperature

(°C)

0.5 m/s (100 LFM)

1.0 m/s (200 LFM)

1.5 m/s (300 LFM)

2.0 m/s (400 LFM)

40 50 60 70 80 85

Output Current (Amps)

Ambient Temperature

(°C)

0.5 m/s (100 LFM)

1.0 m/s (200 LFM)

1.5 m/s (300 LFM)

2.0 m/s (400 LFM)

Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

5 1015202530354045

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 44V

VIN = 48V

VIN = 60V

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 6 of 26

www.murata-ps.com/support

PERFORMANCE DATA

Transverse Longitudinal

Maximum Current Temperature Derating at sea level

(Vin = 48V, airﬂ ow from -Vin to +Vin, with baseplate)

Maximum Current Temperature Derating at sea level

(Vin = 48V, airﬂ ow from Vin to Vout, with baseplate)

Maximum Current Temperature Derating at sea level

(Vin = 60V, airﬂ ow from -Vin to +Vin, with baseplate)

Maximum Current Temperature Derating at sea level

(Vin = 60V, airﬂ ow from Vin to Vout, with baseplate)

Maximum Current Temperature Derating at sea level

(Vin = 44V, airﬂ ow from -Vin to +Vin, with baseplate)

Maximum Current Temperature Derating at sea level

(Vin = 44V, airﬂ ow from Vin to Vout, with baseplate)

40 45 50 55 60 65 70 75 80 85

Output Current (Amps)

Ambient Temperature

(°C)

0.5 m/s (100 LFM)

1.0 m/s (200 LFM)

1.5 m/s (300 LFM)

2.0 m/s (400 LFM)

2.5 m/s (500 LFM)

3.0 m/s (600 LFM)

40 45 50 55 60 65 70 75 80 85

Output Current (Amps)

Ambient Temperature

(°C)

0.5 m/s (100 LFM)

1.0 m/s (200 LFM)

1.5 m/s (300 LFM)

2.0 m/s (400 LFM)

2.5 m/s (500 LFM)

3.0 m/s (600 LFM)

40 45 50 55 60 65 70 75 80 85

Output Current (Amps)

Ambient Temperature

(°C)

0.5 m/s (100 LFM)

1.0 m/s (200 LFM)

1.5 m/s (300 LFM)

2.0 m/s (400 LFM)

2.5 m/s (500 LFM)

3.0 m/s (600 LFM)

40 45 50 55 60 65 70 75 80 85

Output Current (Amps)

Ambient Temperature

(°C)

0.5 m/s (100 LFM)

1.0 m/s (200 LFM)

1.5 m/s (300 LFM)

2.0 m/s (400 LFM)

2.5 m/s (500 LFM)

3.0 m/s (600 LFM)

40 45 50 55 60 65 70 75 80 85

Output Current (Amps)

Ambient Temperature

(°C)

0.5 m/s (100 LFM)

1.0 m/s (200 LFM)

1.5 m/s (300 LFM)

2.0 m/s (400 LFM)

2.5 m/s (500 LFM)

3.0 m/s (600 LFM)

40 45 50 55 60 65 70 75 80 85

Output Current (Amps)

Ambient Temperature

(°C)

0.5 m/s (100 LFM)

1.0 m/s (200 LFM)

1.5 m/s (300 LFM)

2.0 m/s (400 LFM)

2.5 m/s (500 LFM)

3.0 m/s (600 LFM)

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 7 of 26

www.murata-ps.com/support

PERFORMANCE DATA

Stepload Transient Response (Vin = 48V, Iout = 50-75-50% of Iout, Cload = 1000µF)

Enable Startup Delay (Vin = 48V, Iout = 50A, Cout = 10000µF, Ta = +25°C)

Ch2 = Vout, Ch4 = Enable.

Output Ripple & Noise (Vin = 48V, Iout = 0A, Cout = 1µF || 10µF, Ta = +25°C)

Stepload Transient Response (Vin = 48V, Iout = 25-75-25% of Iout, Cload = 1000µF)

Startup Delay (Vin = 48V, Iout = 50A, Cout = 10000µF, Ta = +25°C)

Ch1 = Vin, Ch2 = Vout.

Output Ripple & Noise (Vin = 48V, Iout = 50A, Cout = 1µF || 10µF, Ta = +25°C)

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 8 of 26

www.murata-ps.com/support

PERFORMANCE DATA

Output v. Input Voltage @ Full Load

Output v. Input Voltage @ No Load Output v. Input Voltage @ 50% Load

39.0

39.4

39.8

40.2

40.6

41.0

41.4

41.8

42.2

42.6

43.0

43.4

43.8

Output Voltage

VIN OFF

VIN ON

39.0

39.4

39.8

40.2

40.6

41.0

41.4

41.8

42.2

42.6

43.0

43.4

43.8

Output Voltage

VIN OFF

VIN ON

39.0

39.4

39.8

40.2

40.6

41.0

41.4

41.8

42.2

42.6

43.0

43.4

43.8

Output Voltage

VIN OFF

VIN ON

Third Angle Projection

Dimensions are in inches (mm) shown for ref. only.

Tolerances (unless otherwise speciﬁed):

.XX ± 0.02 (0.5)

.XXX ± 0.010 (0.25)

Angles ± 2˚

ABC (PMBUS) MECHANICAL SPECIFICATIONS WITH HEAT SINK

0.079 [2.0]

0.079

[2.0]

14 15

1110 98

PIN SIDE VIEW SQ 0.02 [0.50]

PINS 1-3,:

I0.040 ±0.0015( 1.016±0 .038 )

Shoulde r: I0.076±0.005(1.93±0.13)

PINS 4,8:

I0.062 ±0.0015( 1.575±0 .038 )

Shoul

r: I0.098±0.005(2.49±0.13)

SEE NOTE 4

0.010 minimum clearance

between standoffs and

highest component

NOTES:

UNLESS OTHERWISE SPECIFIED:

1: ALL DIMENSIONS ARE IN INCHES [MILLIMETERS];

2: ALL TOLERANCES: ×.××in, ±0.02in (×.×mm, ±0.5mm)

×.×××in, ±0.01in (×.××mm, ±0.25mm)

3: COMPONENTS WILL VARY BETWEEN MODELS

4: STANDARD PIN LENGTH: 0.180 Inch

FOR PIN LENGTH OPTIONS, SEE PART NUMBER STRUCTURE.

ISOMETRIC VIEW

[50.80]

2.000

[36.8]

1.45

[58.4]

2.30

0.600

[15.24] [10.80]

0.425

0.600

[15.24] [10.80]

0.425

1.10 [28.0]Max

INPUT/OUTPUT CONNECTIONS

Pin Designation Function

1 +VIN Positive Input

2 On/Off 1 Control Primary On/Off Control

3 No Pin No Pin

4 –VIN Negative Input

5 –VOUT Negative Output

6 +S Positive Remote Sense

7 –S Negative Remote Sense

8 SA0 Address Pin 0

9 SA1 Address Pin 1

10 SCL PMBus Clock

11 SDA PMBus Data

12 PG Power Good Output

13 DGND PMBus Ground

14 SMBALERT PMBus Alert Signal

15 On/Off 2 Control Secondary On/Off Control

16 +VOUT Positive Output

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 9 of 26

www.murata-ps.com/support

[50.80]

2.000

[15.24]

0.600

[15.24]

0.600

[13.2]

0.52

[36.8]

1.45

1.030

[26.16]

0.210

[5.33]

0.220

[5.59]

1.860

[47.24]

[58.4]

2.30 NOTES:

UNLESS OTHERWISE SPECIFIED:

1: M3 SCREW USED TO BOLT UNIT'S BASEPLATE TO OTHER SURFACES

(SUCH AS HEATSINK) MUST NOT EXCEED 0.11''(2.8mm) DEPTH BELOW

THE SURFACE OF BASEPLATE

2: APPLIED TORQUE PER SCREW SHOULD NOT EXCEED 5.3In-lb (0.6Nm);

3: ALL DIMENSIONS ARE IN INCHES [MILIMETERS];

4: ALL TOLERANCES: ×.××in, ±0.02in (×.×mm, ±0.5mm)

×.×××in, ±0.01in (×.××mm, ±0.25mm)

5: COMPONENTS WILL VARY BETWEEN MODELS

6: STANDARD PIN LENGTH: 0.180 Inch

FOR PIN LENGTH OPTIONS, SEE PART NUMBER STRUCTURE.

0.079 [2.0]

0.079

[2.0]

[0.50]

SQ 0.02

ISOMETRIC VIEW

WITH BASEPLATE OPTION

SEE NOTE 6

between standoffs and

highest component

0.010 minimum clearance

Max

PIN SIDE VIEW

PINS 1-3:

Î0.040±0.0015(1.016±0.038)

Shoulder: Î0.076±0.005(1.93±0.13)

PINS 4,8:

Î0.062±0.0015(1.575±0.038)

Shoulder: Î0.098±0.005(2.49±0.13)

M3 THREAD TYP 3PL

Third Angle Projection

Dimensions are in inches (mm) shown for ref. only.

Tolerances (unless otherwise speciﬁed):

.XX ± 0.02 (0.5)

.XXX ± 0.010 (0.25)

Angles ± 2˚

ABC (PMBUS) MECHANICAL SPECIFICATIONS WITH BASEPLATE

INPUT/OUTPUT CONNECTIONS

Pin Designation Function

1 +VIN Positive Input

2 On/Off 1 Control Primary On/Off Control

3 No Pin No Pin

4 –VIN Negative Input

5 –VOUT Negative Output

6 +S Positive Remote Sense

7 –S Negative Remote Sense

8 SA0 Address Pin 0

9 SA1 Address Pin 1

10 SCL PMBus Clock

11 SDA PMBus Data

12 PG Power Good Output

13 DGND PMBus Ground

14 SMBALERT PMBus Alert Signal

15 On/Off 2 Control Secondary On/Off Control

16 +VOUT Positive Output

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 10 of 26

www.murata-ps.com/support

ABC (PMBUS) RECOMMENDED FOOTPRINT

2.32 ±0.02

58.93 ±0.50

1.47 ±0.02

37.34 ±0.50

0.300 ±0.010

7.62 ±0.25

0.600 ±0.010

15.24 ±0.25

2.000 ±0.010

50.80 ±0.25

1.961 ±0.010

49.80 ±0.25

0.079 ±0.010

2 ±0.25

0.457 ±0.010

11.62 ±0.25

(4x)

0.079 ±0.010

2 ±0.25

(3x)

0.060 ±0.005

1.52 ±0.13

(2x)

(10x)

0.082 ±0.005

2.08 ±0.13

0.051 ±0.005

1.30 ±0.13

1.000 ±0.010

25.40 ±0.25

(3x)

0.100

(2x)

2.54

MIN FOR

PIN SHOULDERS

0.120

3.05

MIN FOR

PIN SHOULDERS

10 11

12 13

14 15

TOP VIEW

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 11 of 26

www.murata-ps.com/support

Third Angle Projection

Dimensions are in inches (mm) shown for ref. only.

Tolerances (unless otherwise speciﬁed):

.XX ± 0.02 (0.5)

.XXX ± 0.010 (0.25)

Angles ± 2˚

MECHANICAL SPECIFICATIONS (NO PMBUS) WITH HEAT SINK

I/O Connections

Pin Function

1+Vin

2 Remote On/Off Control

3 -Vin

4 -Vout

8 +Vout

NOTES:

UNLESS OTHERWISE SPECIFIED:

1: ALL DIMENSIONS ARE IN INCHES [MILLIMETERS];

2: ALL TOLERANCES: ×.××in, ±0.02in (×.×mm, ±0.5mm)

×.×××in, ±0.01in (×.××mm, ±0.25mm)

3: COMPONENTS WILL VARY BETWEEN MODELS

4: STANDARD PIN LENGTH: 0.180 Inch

FOR PIN LENGTH OPTIONS, SEE PART NUMBER STRUCTURE.

5: DOSA 5 PIN COMPATIBLE

[36.8]

1.45

[58.4]

2.30

[50.80]

2.000

[28]

1.10 Max

SEE NOTE 4

[10.80]

0.425

[15.24]

0.600

[10.80]

0.425

[15.24]

0.600

PIN SIDE VIEW ISOMETRIC VIEW

PINS 1-3,:

I0.040 ±0.0015 ( 1.016 ±0.038 )

Shoulde r: I0.076 ±0 .005 (1 .93 ±0.13 )

PINS 4,8:

I0.062 ±0.0015 ( 1.575 ±0.038 )

Shoul

r: I0.098 ±0.005 (2.49 ±0.13 )

0.010 minimum clearance

between standoffs and

highest component

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 12 of 26

www.murata-ps.com/support

NOTES:

UNLESS OTHERWISE SPECIFIED:

1: M3 SCREW USED TO BOLT UNIT'S BASEPLATE TO OTHER SURFACES

(SUCH AS HEATSINK) MUST NOT EXCEED 0.11''(2.8mm) DEPTH BELOW

THE SURFACE OF BASEPLATE

2: APPLIED TORQUE PER SCREW SHOULD NOT EXCEED 5.3In-lb (0.6Nm);

3: ALL DIMENSIONS ARE IN INCHES [MILIMETERS];

4: ALL TOLERANCES: ×.××in, ±0.02in (×.×mm, ±0.5mm)

×.×××in, ±0.01in (×.××mm, ±0.25mm)

5: COMPONENTS WILL VARY BETWEEN MODELS

6: STANDARD PIN LENGTH: 0.180 Inch

FOR PIN LENGTH OPTIONS, SEE PART NUMBER STRUCTURE.

7: DOSA 5 PIN COMPATIBLE

ISOMETRIC VIEW

between standoffs and

highest component

0.010 minimum clearance

PINS 1-3:

Î0.040±0.0015(1.016±0.038)

Î0.076±0.005(1.93±0.13)

PINS 4,8:

Î0.062±0.0015(1.575±0.038)

Shoulder:

Î0.098±0.005(2.49±0.13)

WITH BASEPLATE OPTION

SEE NOTE 6

[15.24]

0.600

[15.24]

0.600

PIN SIDE VIEW

[50.80]

2.000

[13.2]

0.52 Max

[5.59]

0.220 [47.24]

1.860

[26.16]

1.030

[36.8]

1.45

[5.33]

0.210

[58.4]

2.30

M3 THREAD TYP 3PL

Third Angle Projection

Dimensions are in inches (mm) shown for ref. only.

Tolerances (unless otherwise speciﬁed):

.XX ± 0.02 (0.5)

.XXX ± 0.010 (0.25)

Angles ± 2˚

MECHANICAL SPECIFICATIONS (NO PMBUS) WITH BASEPLATE

I/O Connections

Pin Function

1+Vin

2 Remote On/Off Control

3 -Vin

4 -Vout

8 +Vout

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 13 of 26

www.murata-ps.com/support

RECOMMENDED FOOTPRINT (NO PMBUS)

2.32 ±0.02

58.93 ±0.50

1.47 ±0.02

37.34 ±0.50

0.300 ±0.010

7.62 ±0.25

0.600 ±0.010

15.24 ±0.25

2.000 ±0.010

50.80 ±0.25

(3x)

0.060 ±0.005

1.52 ±0.13

(2x)

0.082 ±0.005

2.08 ±0.13

1.000 ±0.010

25.40 ±0.25

TOP VIEW

(3x)

0.100

(2x)

2.54

MIN FOR

PIN SHOULDERS

0.120

3.05

MIN FOR

PIN SHOULDERS

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 14 of 26

www.murata-ps.com/support

BASEPLATE VERSION HEATSINK VERSION

Carton accommodates two (2) trays yielding 30 converters per carton

10.50 (266.7) ±.25

11.00 (279.4) ±.25

Carton accommodates two (2) trays yielding 24 converters per carton

10.0 (254) ±.25

2.75 (69.85) ±.25

closed height

4.25 (108) ±.25

closed height

0.88 (22.35)

REF

Each static dissipative polyethylene

foam tray accommodates

15 converters in a 3 x 5 array.

Each static dissipative polyethylene

foam tray accommodates

12 converters in a 3 x 4 array.

9.92

(251.97)

REF

9.92

(251.97)

REF

STANDARD PACKAGING

Third Angle Projection

Dimensions are in inches (mm) shown for ref. only.

Tolerances (unless otherwise speciﬁed):

.XX ± 0.02 (0.5)

.XXX ± 0.010 (0.25)

Angles ± 2˚

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 15 of 26

www.murata-ps.com/support

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 16 of 26

www.murata-ps.com/support

Power Management Overview

The module includes a wide range of readable and conﬁ gurable power

management features that are easy to implement with a minimum of external

components. Furthermore, the module includes protection features that

continuously protect the load from damage due to unexpected system faults.

The SMBALERT pin alerts the host if there is a fault in the module. The follow-

ing product parameters can continuously be monitored by a host: Vout, Iout,

Vin, Temperature, and Power Good. The module is distributed with a default

conﬁ guration suitable for a wide range operation in terms of Vin, Vout, and

load. All power management functions can be reconﬁ gured using the PMBus

interface. The product provides a PMBus digital interface that enables the user

to conﬁ gure many aspects of the device operation as well as monitor the input

and output parameters. Please contact our FAE for special conﬁ gurations.

Soft-start Power Up

The default rise time of the ramp up is 20 ms. When starting by applying

input voltage the control circuit boot-up time adds an additional 10 ms delay.

The soft-start power up of the module can be reconﬁ gured using the PMBus

interface.

Over Voltage Protection (OVP)

The module includes over voltage limiting circuitry for protection of the load.

The default OVP limit is 20% above the nominal output voltage. If the output

voltage surpasses the OVP limit, the module can respond in different ways.

The default response from an over voltage fault is to immediately shut down.

The device will continuously check for the presence of the fault condition,

and when the fault condition no longer exists the device will be re-enabled.

The OVP fault level and fault response can be reconﬁ gured using the PMBus

interface.

Over Current Protection (OCP, Current limit)

The module includes current limiting circuitry for protection at continuous over

load. The default setting for the product is hicup mode. The current limit could

be conﬁ gured by simply setting the IOUT_OC_FAULT_LIMIT to be greater than

the IOUT_OC_WARN_LIMIT. The maximum value that the current limit could be

set is 50A.

Power Good

The module provides Power Good (PG) ﬂ ag in the Status Word register that

indicates the output voltage is within a speciﬁ ed tolerance of its target level

and no fault condition exists. The Power Good pin default logic is negative and

it can be conﬁ gured by MFR_PGOOD_POLARITY.

TECHNICAL NOTES

PMBus Interface

This module offers a PMBus digital interface that enables the user to conﬁ gure

many characteristics of the device operation as well as to monitor the input

and output voltages, output current and device temperature. The module can

be used with any standard two-wire I2C or SMBus host device. In addition, the

module is compatible with PMBus version 1.2 and includes an SMBALERT line

to help alleviate bandwidth limitations related to continuous fault monitoring.

The module supports 100 kHz and 400 kHz bus clock frequency only.

Monitoring via PMBus

A system controller (host device) can monitor a wide variety of parameters

through the PMBus interface. The controller can monitor fault conditions by

monitoring the SMBALERT pin, which will be asserted when any number of

pre-conﬁ gured fault or warning conditions occur. The system controller can

also continuously monitor any number of power conversion parameters includ-

ing but not limited to the following:

• Input voltage

• Output voltage

• Output current

• Module temperature

Software Tools for Design and Production

For these modules, Murata-PS provides software for conﬁ guring and monitor-

ing via the PMBus interface. For more information please contact your local

Murata-PS representative.

Click here for Application Note AN-63, Digital DC-DC Evaluation Board

User Guide.

Click here for Application Note AN-64, Murata Power Brick GUI User Guide.

CMD Command Name

SMBus

Transaction

Type:

Writing

Data

SMBus

Transaction

Type:

Reading

Data

Number

of Data

Bytes

Default Value Lower

Limit

Upper

Limit Cross check Unit

01h OPERATION2Write Byte Read Byte 1 0x80    

02h ON_OFF_CONFIG3Write Byte Read Byte 1 0x1D    

03h CLEAR_FAULTS Send byte N/A 0 N/A    

10h WRITE_PROTECT Write Byte Read Byte 1 0x00    

11h STORE_DEFAULT_ALL4Send byte N/A 0 N/A    

12h RESTORE_DEFAULT_ALL4Send byte N/A 0 N/A    

15h STORE_USER_ALL4Send byte N/A 0 N/A    

16h RESTORE_USER_ALL4Send byte N/A 0 N/A    

19h CAPABILITY N/A Read Byte 1 0xB0    

20h VOUT_MODE N/A Read Byte 1 0x17    

21h VOUT_COMMAND Write Word Read Word 2 12.000 8.100 13.200  V

22h VOUT_TRIM Write Word Read Word 2 0   8.1<=Vout<=13.215 V

25h VOUT_MARGIN_HIGH Write Word Read Word 2 13.199 8.100 13.199 >VOUT_MARGIN_LOW V

26h VOUT_MARGIN_LOW Write Word Read Word 2 8.100 8.100 13.200 <VOUT_MARGIN_HIGH V

28h VOUT_DROOP Write Word12 Read Word 2 0/1213 0 100 Vout>=8.100 m

40h VOUT_OV_FAULT_LIMIT Write Word Read Word 2 14.199 8.100 15.600 >VOUT_OV_WARN_LIMIT V

41h VOUT_OV_FAULT_RESPONSE5Write Byte Read Byte 1 0xB8    

42h VOUT_OV_WARN_LIMIT Write Word Read Word 2 13.500 8.100 15.600 <VOUT_OV_FAULT_LIMIT

>VOUT_COMMAND V

46h IOUT_OC_FAULT_LIMIT Write Word Read Word 2 59.00 0.00 65.00 >IOUT_OC_WARN_LIMIT A

47h IOUT_OC_FAULT_RESPONSE6Write Byte Read Byte 1 0xF8    

4Ah IOUT_OC_WARN_LIMIT Write Word Read Word 2 56.00 0.00 65.00 <IOUT_OC_FAULT_LIMIT A

4Fh OT_FAULT_LIMIT Write Word Read Word 2 135 30 145 >OT_WARN_LIMIT °C

50h OT_FAULT_RESPONSE5Write Byte Read Byte 1 0xB8    

51h OT_WARN_LIMIT Write Word Read Word 2 115 30 145 <OT_FAULT_LIMIT °C

55h VIN_OV_FAULT_LIMIT Write Word Read Word 2 66.50 32.00 110.00 >VIN_OV_WARN_LIMIT V

56h VIN_OV_FAULT_RESPONSE7Write Byte Read Byte 1 0xF8    

57h VIN_OV_WARN_LIMIT Write Word Read Word 2 64.50 32.00 110.00 <VIN_OV_FAULT_LIMIT

>VIN_UV_WARN_LIMIT V

58h VIN_UV_WARN_LIMIT Write Word Read Word 2 42.00 32.00 75.00 <VIN_OV_WARN_LIMIT

>VIN_UV_FAULT_LIMIT V

59h VIN_UV_FAULT_LIMIT Write Word Read Word 2 40.00 32.00 75.00 <VIN_UV_WARN_LIMIT V

5Ah VIN_UV_FAULT_RESPONSE7Write Byte Read Byte 1 0xF8    

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 17 of 26

www.murata-ps.com/support

PMBus Addressing

Figure 2 and the accompanying table display the recommended resistor values

for hard-wiring PMBus addresses (1% tolerance resistors recommended): The

address is set in the form of two octal (0 to 7) digits, with each pin setting one

digit. The resistor values for each digit is shown below.

The SA0 and SA1 pins can be conﬁ gured with a resistor to GND according to

the following equation.

PMBus Address = 8 x (SA0value) + (SA1 value)

If the calculated PMBus address is 0d, 11d or 12d, PMBus address 119d is

assigned instead. From a system point of view, the user shall also be aware of

further limitations of the addresses as stated in the PMBus Speciﬁ cation. It is

not recommended to keep the SA0 and SA1 pins left open.

PMBus Commands

The products are designed to be PMBus compliant. The following tables list

the implemented PMBus read commands. For more detailed information see

“PMBus Power System Management Protocol Speciﬁ cation, Part I – General

Requirements, Transport and Electrical Interface” and “PMBus Power System

Management Protocol, Part II – Command Language.”

Figure 2. Schematic of Connection of Address Resistors

SA0

SA1

R1R0

Digit (SA0, SA1 index) Resistor Value [kΩ]

010

122

233

347

468

5 100

6 150

7 220

OVERALL

OVERALL (CONT.)

CMD Command Name

SMBus

Transaction

Type:

Writing

Data

SMBus

Transaction

Type:

Reading

Data

Number

of Data

Bytes

Default Value Lower

Limit

Upper

Limit Cross check Unit

5Eh POWER_GOOD_ON Write Word Read Word 2 10.799 1.000 13.199 >POWER_GOOD_OFF V

5Fh POWER_GOOD_OFF Write Word Read Word 2 9.600 1.000 13.199 <POWER_GOOD_ON V

60h TON_DELAY Write Word12 Read Word 2 1 1 500  ms

61h TON_RISE16 Write Word12 Read Word 2 0 10 100  ms

64h TOFF_DELAY Write Word12 Read Word 2 0 0 500  ms

65h TOFF_FALL16 Write Word12 Read Word 2 0 10 100  ms

78h STATUS_BYTE Write Byte Read Byte 1 N/A    

79h STATUS_WORD Write Word Read Word 2 N/A    

7Ah STATUS_VOUT Write Byte Read Byte 1 N/A    

7Bh STATUS_IOUT Write Byte Read Byte 1 N/A    

7Ch STATUS_INPUT Write Byte Read Byte 1 N/A    

7Dh STATUS_TEMPERATURE Write Byte Read Byte 1 N/A    

7Eh STATUS_CML Write Byte Read Byte 1 N/A    

88h READ_VIN N/A Read Word 2 N/A    V

8Bh READ_VOUT N/A Read Word 2 N/A    V

8Ch READ_IOUT N/A Read Word 2 N/A    A

8Dh READ_TEMPERATURE_18N/A Read Word 2 N/A    °C

8Eh READ_TEMPERATURE_29N/A Read Word* 2 N/A    °C

94h READ_DUTY_CYCLE N/A Read Word 2 N/A    %

95h READ_FREQUENCY N/A Read Word 2 N/A    kHZ

96h READ_POUT N/A Read Word 2 N/A    W

98h PMBUS_REVISION N/A Read Byte 1 0x42    

99h MFR_ID N/A Block Read 22 “Murata Power

Solutions”   

9Ah MFR_MODEL10 Block Write* Block Read <=20 N/A    

9Bh MFR_REVISION10 Block Write* Block Read <=10 N/A    

9Dh MFR_DATE10 Block Write* Block Read <=10 N/A    

9Eh MFR_SERIAL10 Block Write* Block Read <=10 N/A    

A0h MFR_VIN_MIN N/A Read Word 2 44.00    V

A1h MFR_VIN_MAX N/A Read Word 2 60.00    V

A2h MFR_IIN_MAX N/A Read Word 2 14.28    A

A3h MFR_PIN_MAX N/A Read Word 2 438    W

A4h MFR_VOUT_MIN N/A Read Word 2 8.100    V

A5h MFR_VOUT_MAX N/A Read Word 2 13.199    V

A6h MFR_IOUT_MAX N/A Read Word 2 50.00    A

A7h MFR_POUT_MAX N/A Read Word 2 600    W

A8h MFR_TAMBIENT_MAX N/A Read Word 2 85    °C

A9h MFR_TAMBIENT_MIN N/A Read Word 2 -40    °C

B0h USER_DATA_00 Block Write Block Read <=20 “---”    

B1h USER_DATA_01 Block Write Block Read <=20 “---”    

C0h MFR_MAX_TEMP_1 N/A Read Word 2 135    °C

D0h MFR_VARIABLE_FREQUENCY_DISABLE Write Byte Read Byte 1 0x00    

DBh MFR_CURRENT_SHARE_CONFIG Write Byte* Read Byte 1 0x00/0x0111   

DDh MFR_PRIMARY_ON_OFF_CONFIG Write Byte Read Byte 1 0x04/0x0614   

DEh MFR_PGOOD_POLARITY Write Byte Read Byte 1 0x00    

E8h MFR_VIN_OV_FAULT_HYS Write Word Read Word 2 2.00 1.00 20.00  V

E9h MFR_VIN_UV_FAULT_HYS Write Word Read Word 2 2.00 1.00 20.00  V

EAh MFR_OT_FAULT_HYS Write Word Read Word 2 20 5 50  °C

F6h MFR_CALIBRATION_STATUS N/A Read Byte* 1 0xC7    

F9h MFR_VIN_SENSE_CALIBRATION Write byte* N/A 1 N/A    

FAh MFR_IOUT_SENSE_CALIBRATION Write Word* N/A 2 N/A    

FBh MFR_VOUT_SET_POINT_CALIBRATION Write Word* N/A 2 N/A    

FCh MFR_SUPERVISOR_PASSWORD Block Write N/A N/A N/A    

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 18 of 26

www.murata-ps.com/support

OVERALL (CONT.)

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 19 of 26

www.murata-ps.com/support

MURATA-PS deﬁ ned commands (01-CFh Refer to PMBus 1.2 SPEC)

D0h: MFR_VARIABLE_FREQUENCY_DISABLE

Bits Purpose Value Meaning

7:1 0000000 Reserved

0Variable frequency

control

0 Turn on variable frequency control

1 Turn off variable frequency control

DBh: MFR_CURRENT_SHARE_CONFIG

Bits Purpose Value Meaning

7:1 0000000 Reserved

0Droop Current

Share Control

0 Current share disabled

1 Droop current share mode enabled

DDh: MFR_PRIMARY_ON_OFF_CONFIG

Bits Purpose Value Meaning

7:3 00000 Reserved

Controls how the

unit responds to

the CONTROL pin

0 Unit ignores the primary ON/OFF pin

1Unit requires the primary ON/OFF pin to

be asserted to start the unit.

1Polarity of primary

ON/OFF logic

0 Active low (Pull pin low to start the unit)

1Active high (Pull high or open to start

the unit)

0 0 Reserved

DEh: MFR_ PGOOD_POLARITY

Bits Purpose Value Meaning

7:1 0000000 Reserved

0Power good

polarity of pin 12

0Negative logic, output low if Vout rises to

speciﬁ c value

1Positive logic, output high if Vout rises to

speciﬁ c value

E8h: MFR_VIN_OV_FAULT_HYS

Hysteresis of VIN_OV_FAULT recover, Linear data format

E9h: MFR_VIN_UV_FAULT_HYS

Hysteresis of VIN_UV_FAULT recover, Linear data format

EAh: MFR_OT_FAULT_HYS

Hysteresis of OT_FAULT recover, Linear data format

F6h: MFR_CALIBRATION_STATUS

Refer to calibration procedure ﬁ le

F9h: MFR_VIN_SENSE_CALIBRATION

Refer to calibration procedure ﬁ le

FAh: MFR_IOUT_SENSE_CALIBRATION

Refer to calibration procedure ﬁ le

FBh: MFR_VOUT_SET_POINT_CALIBRATION

Refer to calibration procedure ﬁ le

FCh: MFR_SUPERVISOR_PASSWORD

Set unit to supervisor mode or ROM mode, Refer to password table

Notes:

* Only available in supervisor mode (default state is user mode, send password to comand 0xFC to

change to supervisor mode)

1. a) Unit restores the entire contents of the non-volatile User Store memory when power up

b) PEC is supported

c) Max bus speed: 400kHZ

d) SMBALERT# is supported

e) Linear data format used

f) addressing: If the calculated PMBus address is 0d, 11d or 12d, SA0 or SA1 lefts open, default

PMBus address 120d is assigned instead.

2. Not supported items:

100101XXb Margin Low(Ignore Fault),

101001XXb On Margin High(Ignore Fault)

3. Restart delay of turned off by OPEATION or CONTROL or primary on/off is 200ms

4. Unit will shutdown 1 second for protection , then recover automaticly

5. Restart delay unit: 500ms, lower limit: 500ms.

Turn off delay unit: 0ms, lower limit: 0ms

if bits 7:6=11b, restart delay is 500ms

6. Restart delay unit and Turn off delay unit are same as note 5

Bits 7:6: 00b,01b,10b are not supported

7. Restart delay unit: 100ms, lower limit: 100ms.

Turn off delay unit:0ms, lower limit: 0ms if bits 7:6=11b, restart delay is 100ms

8. Temperature of baseplate side

9. Temperature of pin side

10. Unit’s actual inforamtion

11. Default value of DROOP CURRENT SHARE mode: 0x01

Default value of CURRENT SHARE DISABLED mode: 0x00

12. Not available in Droop current share mode

13. Locked to 12m in DROOP CURRENT SHARE mode; conﬁ gurable and default value is 0m in CUR-

RENT SHARE DISABLED mode

14. Default value of negative logic: 0x04

Default value of positive logic: 0x06

15. Unit can receive any value for VOUT_TRIM command, but Vout is limited to 8.1~13.2V, if calculated

Vout exceeds limit, then equal to limit.

16. Value of 0 is acceptable, which is the same as lower limit to unit.

CTRL/CS Pin VOUT_DROOP TON_DELAY TOFF_DELAY TON_RISE TOFF_FALL

-- -- -- -- -- --

CTRL conﬁ gurable conﬁ gurable conﬁ gurable conﬁ gurable conﬁ gurable

CTRL locked to 0x000A locked to 0x0001 locked to 0x0000 locked to 0x0000 locked to 0x0000

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 20 of 26

www.murata-ps.com/support

STATUS WORD AND BYTE (GREEN = SUPPORTED)

STATUS_VOUT

7 VOUT_OV_FAULT

6 VOUT_OV_WARNING

5 VOUT_UV_WARNING

4 VOUT_UV_FAULT

3 VOUT_MAX Warning

2 TON_MAX_FAULT

1 TOFF_MAX_WARNING

0 VOUT Tracking Error

STATUS_IOUT

7 IOUT_OC_FAULT

6 IOUT_OC_LV_FAULT

5 IOUT_OC_WARNING

4 IOUT_UC_FAULT

3 Current Share Fault

2 In Power Limiting Mode

1 POUT_OP_FAULT

0 POUT_OP_WARNING

STATUS_TEMPERATURE

7 OT_FAULT

6 OT_WARNING

5 UT_WARNING

4 UT_FAULT

3 Reserved

2 Reserved

1 Reserved

0 Reserved

STATUS_CML

7 Invalid/Unsupported Command

6 Invalid/Unsupported Data

5 Packet Error Check Failed

4 Memory Fault Detected

3 Processor Fault Detected

2 Reserved

1 Other Communication Fault

0 Other Memory Or Logic Fault

STATUS_WORD

7 VOUT

6 IOUT/POUT

5 INPUT

4 MFR_SPECIFIC

3 POWER_GOOD#

2 FANS

1 OTHER

0 UNKNOWN

7 BUSY

6 OFF

5 VOUT_OV_FAULT

4 IOUT_OC_FAULT

3 VIN_UV_FAULT

2 TEMPERATURE

1 CML

0 NONE OF THE ABOVE

STATUS_OTHER

7 Reserved

6 Reserved

5 Input A Fuse/Breaker Fault

4 Input B Fuse/Breaker Fault

3 Input A OR-ing Device Fault

2 Input B OR-ing Device Fault

1 Output OR-ing Device Fault

0 Reserved

STATUS_INPUT

7 VIN_OV_FAULT

6 VIN_OV_WARNING

5 VIN_UV_WARNING

4 VIN_UV_FAULT

3 Unit Off For Low Input Voltage

2 IIN_OC_FAULT

1 IIN_OC_WARNING

0 PIN_OP_WARNING

STATUS_MFR_SPECIFIC

Manufacturer Deﬁ ned

STATUS_FANS_1_2

7 Fan 1 Fault

6 Fan 2 Fault

5 Fan 1 Warning

4 Fan 2 Warning

3 Fan 1 Speed Override

2 Fan 2 Speed Override

1 Air Flow Fault

0 Air Flow Warning

STATUS_FANS_3_4

7 Fan 3 Fault

6 Fan 4 Fault

5 Fan 3 Warning

4 Fan 4 Warning

3 Fan 3 Speed Override

2 Fan 4 Speed Override

1 Reserved

0 Reserved

Parallel Load Sharing (S Option, Load Sharing)

Two or more converters may be connected in parallel at both the input and

output terminals to support higher output current (total power, see ﬁ gure 3) or

to improve reliability due to the reduced stress that results when the modules

are operating below their rated limits. For applications requiring current share,

followed the guidelines below. The products have a pre-conﬁ gured volt-

age. The stated output voltage set point is at no load. The output voltage will

decrease when the load current is increased. The voltage will drop 0.35V while

load reaches max load. Our goal is to have each converter contribute nearly

identical current into the output load under all input, environmental and load

conditions.

Using Parallel Connections – Load Sharing (Power Boost)

Direct Connection Parallel Guidelines

 Use a common input power source. The input voltage must be between 44V

and 60V.

 +Vout and –Vout of all parallel units should be connected with a balance

output impedance; +Sense and –Sense should be connected together with

PMBus option (see ﬁ

gure 3).

 Turn all units off before conﬁ guring the output voltage via PMBus com-

mands; all units must have the same output voltage conﬁ guration.

 It is recommended to turn on one unit ﬁ rst and then turn other unit (s) on

after the output for the ﬁ

rst one has settled. Turn on the next unit (s) after the

previous unit reaches its regulated output voltage for at least 10mS. Users

can use a different control signal to turn each unit on.

 Users have the option to use a common primary or secondary Remote On/

Off logic control signal to turn on modules at the same time after the input

voltage rises above 44V.

 Do not use PMBus to control unit On/Off when parallel operation is used.

 First power up the parallel system (all converters) with a load not exceeding

the rated load of 60%*50A*UNITS_QUANTITY and allow converters to settle

(typically 10-50mS) before applying full load (90% load is recommended).

If the loads are downstream POL converters, power these up shortly after

the converter has reached steady state output. Also be aware of the delay

caused by charging up external bypass capacitors.

 When converters are connected in parallel, allow for a safety factor of at

least 10%. Up to 90% of max output current can be used from each module.

 It is critical that the PCB layout incorporates identical connections from each

module to the load; use the same trace rating and airﬂ ow/thermal environ-

ments. If you add input ﬁ lter components, use identical components and

layout.

 For Power-down, do not soft-off (GUI) while in parallel operation. Power

down units by primary or secondary On/Off signal. Turn units off at the same

time or one by one to avoid the OCP being triggered.

CAUTION: This converter is not internally fused. To avoid danger to persons

or equipment and to retain safety certiﬁ cation, the user must connect an

external fast-blow input fuse as listed in the speciﬁ cations. Be sure that the PC

board pad area and etch size are adequate to provide enough current so that

the fuse will blow with an overload.

Using Parallel Connections – Redundancy (N+1)

The redundancy connections require external user supplied “OR”ing diodes or

“OR”ing MOSFETs for reliability purposes. The diodes allow for an uninterrupt-

able power system operation in case of a catastrophic failure (shorted output)

by one of the converters.

The diodes should be identical part numbers to enhance balance between

the converters. The default factory nominal voltage should be sufﬁ ciently

matched between converters. The OR’ing diode system is the responsibility of

the user. Be aware of the power levels applied to the diodes and possible heat

sink requirements.

Schottky power diodes with approximately 0.3V drops or “OR”ing MOSFETs

may be suitable in the loop whereas 0.7 V silicon power diodes may not be

advisable. In the event of an internal device fault or failure of the mains power

modules on the primary side, the other devices automatically take over the

entire supply of the loads. In the basic N+1 power system, the “N” equals the

number of modules required to fully power the system and “+1” equals one

back-up module that will take over for a failed module. If the system consists

of two power modules, each providing 50% of the total load power under

normal operation and one module fails, another one delivers full power to the

load. This means you can use smaller and less expensive power converters as

the redundant elements, while achieving the goal of increased availability.

Thermal Shutdown

Extended operation at excessive temperature will initiate overtemperature

shutdown triggered by a temperature sensor outside the PWM controller. This

operates similarly to overcurrent and short circuit mode. The inception point

of the overtemperature condition depends on the average power delivered,

the ambient temperature and the extent of forced cooling airﬂ ow. Thermal

shutdown uses only the hiccup mode (autorestart) and PMBus conﬁ gurable

hysteresis.

Start Up Considerations

When power is ﬁ rst applied to the DC-DC converter, there is some risk of start

up difﬁ

culties if you do not have both low AC and DC impedance and adequate

regulation of the input source. Make sure that your source supply does not allow

the instantaneous input voltage to go below the minimum voltage at all times.

Use a moderate size capacitor very close to the input terminals. You may

need two or more parallel capacitors. A larger electrolytic or ceramic cap sup-

plies the surge current and a smaller parallel low-ESR ceramic cap gives low

AC impedance.

Remember that the input current is carried both by the wiring and the

ground plane return. Make sure the ground plane uses adequate thickness

copper. Run additional bus wire if necessary.

Input Fusing

Certain applications and/or safety agencies may require fuses at the inputs of

power conversion components. Fuses should also be used when there is the

possibility of sustained input voltage reversal which is not current-limited. For

greatest safety, we recommend a fast blow fuse installed in the ungrounded

input supply line.

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 21 of 26

www.murata-ps.com/support

TECHNICAL NOTES (CONT.)

Figure 3. Load Sharing Block Diagram

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 22 of 26

www.murata-ps.com/support

Input Under-Voltage Shutdown and Start-Up Threshold

Converters will not begin to regulate properly until the rising input voltage

exceeds and remains at the Start-Up Threshold Voltage (see Speciﬁ cations).

Once operating, converters will not turn off until the input voltage drops below

the Under-Voltage Shutdown Limit. Subsequent restart will not occur until the

input voltage rises again above the Start-Up Threshold. This built-in hysteresis

prevents any unstable on/off operation at a single input voltage. The over/

under-voltage fault level and fault response and hysterisis can be conﬁ gured

via the PMBus interface.

Start-Up Time

Start-Up Time (see Speciﬁ cations) is the time interval between the point when

the rising input voltage crosses the Start-Up Threshold and the output voltage

enters and remains within its speciﬁ ed accuracy band.

These converters include a soft start circuit to control Vout ramp time,

thereby limiting the input inrush current.

The On/Off Remote Control interval from On command to Vout (ﬁ nal ±5%)

assumes that the converter already has its input voltage stabilized above the

Start-Up Threshold before the On command. The interval is measured from the

On command until the output enters and remains within its speciﬁ ed accuracy

band.

Recommended Input Filtering

The user must assure that the input source has low AC impedance to provide

dynamic stability and that the input supply has little or no inductive content,

including long distributed wiring to a remote power supply. The converter will

operate with no additional external capacitance if these conditions are met.

For best performance, we recommend installing a low-ESR capacitor im-

mediately adjacent to the converter’s input terminals. The capacitor should be

a ceramic type such as the Murata GRM32 series or a polymer type. More input

bulk capacitance may be added in parallel (either electrolytic or tantalum) if

needed.

Recommended Output Filtering

The converter will achieve its rated output ripple and noise with no additional

external capacitor. However, the user may install more external output capaci-

tance to reduce the ripple even further or for improved dynamic response.

Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors.

Mount these close to the converter. Measure the output ripple under your load

conditions.

Use only as much capacitance as required to achieve your ripple and noise

objectives. Excessive capacitance can make step load recovery sluggish or

possibly introduce instability. Do not exceed the maximum rated output capaci-

tance listed in the speciﬁ cations.

Input Ripple Current and Output Noise

All models in this converter series are tested and speciﬁ ed for input reﬂ ected

ripple current and output noise using designated external input/output com-

ponents, circuits and layout as shown in the ﬁ gures below. The Cbus and Lbus

components simulate a typical DC voltage bus.

Minimum Output Loading Requirements

All models regulate within speciﬁ cation and are stable under no load to full

load conditions.

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 23 of 26

www.murata-ps.com/support

BUS

= 220µF, ESR < 700mΩ @ 100kHz

BUS

= 220µF, ESR < 100mΩ @ 100kHz

BUS

= 12µH

+Vin

-Vin

CURRENT

PROBE

OSCILLOSCOPE

–

Figure 4. Measuring Input Ripple Current

Thermal Shutdown (OTP, UTP)

To prevent many over temperature problems and damage, these converters

include thermal shutdown circuitry. If environmental conditions cause the

temperature of the DC-DCs to rise above the Operating Temperature Range

up to the shutdown temperature, an on-board electronic temperature sensor

will power down the unit. When the temperature decreases below the turn-on

threshold set in the command recover temp is (OT_FAULT_LIMIT-MFR_OT_

FAULT_HYS), the hysteresis is deﬁ ned in general electrical speciﬁ cation

section. The OTP and hysteresis of the module can be reconﬁ gured using the

PMBus. The OTP and UTP fault limit and fault response can be conﬁ gured via

the PMBus.

CAUTION: If you operate too close to the thermal limits, the converter may

shut down suddenly without warning. Be sure to thoroughly test your applica-

tion to avoid unplanned thermal shutdown.

Temperature Derating Curves

The graphs in this data sheet illustrate typical operation under a variety of

conditions. The Derating curves show the maximum continuous ambient air

temperature and decreasing maximum output current which is acceptable

under increasing forced airﬂ ow measured in Linear Feet per Minute (“LFM”).

Note that these are AVERAGE measurements. The converter will accept brief

increases in current or reduced airﬂ ow as long as the average is not exceeded.

Note that the temperatures are of the ambient airﬂ ow, not the converter

itself which is obviously running at higher temperature than the outside air.

Also note that “natural convection” is deﬁ ned as very ﬂ ow rates which are not

using fan-forced airﬂ ow. Depending on the application, “natural convection” is

usually about 30-65 LFM but is not equal to still air (0 LFM).

Murata Power Solutions makes Characterization measurements in a closed

cycle wind tunnel with calibrated airﬂ ow. We use both thermocouples and an

infrared camera system to observe thermal performance. As a practical matter,

it is quite difﬁ cult to insert an anemometer to precisely measure airﬂ ow in

most applications. Sometimes it is possible to estimate the effective airﬂ ow if

you thoroughly understand the enclosure geometry, entry/exit oriﬁ ce areas and

the fan ﬂ owrate speciﬁ cations.

CAUTION: If you exceed these Derating guidelines, the converter may have

an unplanned Over Temperature shut down. Also, these graphs are all collected

near Sea Level altitude. Be sure to reduce the derating for higher altitude.

Output Short Circuit Condition

The short circuit condition is an extension of the “Current Limiting” condition.

When the monitored peak current signal reaches a certain range, the PWM

controller’s outputs are shut off thereby turning the converter “off.” This is

followed by an extended time out period. This period can vary depending on

other conditions such as the input voltage level. Following this time out period,

the PWM controller will attempt to re-start the converter by initiating a “normal

start cycle” which includes softstart. If the “fault condition” persists, another

“hiccup” cycle is initiated. This “cycle” can and will continue indeﬁ nitely until

such time as the “fault condition” is removed, at which time the converter will

resume “normal operation.” Operating in the “hiccup” mode during a fault

condition is advantageous in that average input and output power levels are

held low preventing excessive internal increases in temperature.

Remote On/Off Control

The DRQ series modules are equipped with both primary (On/Off 1, enabled,

pull up internal) and secondary (On/Off 2, disabled, pull up internal) control pins

for increased system ﬂ exibility. Both are conﬁ gurable via PMBus. The On/Off

pins are TTL open-collector and/or CMOS open-drain compatible. (See general

speciﬁ cations for threshold voltage levels. See also MFR_PRIMARY_ON_OFF_

CONFIG section.)

Negative-logic models are on (enabled) when the On/Off is grounded or

brought to within a low voltage (see speciﬁ cations) with respect to –Vin.

The device is off (disabled) when the On/Off is left open or is pulled high to

+13.5Vdc with respect to –Vin. The On/Off function allows the module to be

turned on/off by an external device switch.

Positive-logic models are enabled when the On/Off pin is left open or is

pulled high to +13.5V with respect to –Vin. Positive-logic devices are disabled

when the On/Off is grounded or brought to within a low voltage (see speciﬁ ca-

tions) with respect to –Vin. For voltage levels for On/Off 2 signal see functional

speciﬁ cations.

The restart delay for this module to turn On/Off by the On/Off control pin is

100ms.

C1 = 1µF; C2 = 10µF

LOAD 2-3 INCHES (51-76mm) FROM MODULE

LOAD

C1 C2 SCOPE

+Vout

-Vout

Figure 5. Measuring Output Ripple and Noise (PARD)

On/Off 1 or 2 Control status

Not ignored Ignored

On/Off 1 or 2 pin P LOGIC N LOGIC P LOGIC N LOGIC

OPEN ON OFF ON ON

PULL HIGH ON OFF ON ON

PULL LOW OFF ON ON ON

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 24 of 26

www.murata-ps.com/support

On/Off 1 can be conﬁ gured by PMBus command MFR_PRIMARY_ON_OFF_

CONFIG (DDh); default conﬁ guration is not ignored; required On/Off 1 control

pin to be asserted to start the unit.

On/Off 2 can be conﬁ gured by PMBUS command ON_OFF_CONFIG (02h);

default conﬁ guration is ignored; treat it as always ON.

DRQ's On/Off status is dependent on On/Off 1 control, On/Off 2 control, and

OPERATION (PMBus command) status; all three must be ON to turn DRQ on; if

one of them is OFF, unit will be turned off.

Output Capacitive Load

These converters do not require external capacitance added to achieve rated

speciﬁ

cations. Users should only consider adding capacitance to reduce

switching noise and/or to handle spike current load steps. Install only enough

capacitance to achieve noise objectives. Excess external capacitance may

cause degraded transient response and possible oscillation or instability.

Remote Sense Input

Use the Sense inputs with caution. Sense is normally connected at the load.

Sense inputs compensate for output voltage inaccuracy delivered at the load.

Figure 6. Remote Sense Circuit Conﬁ guration

LOAD

Contact and PCB resistance

losses due to IR drops

Contact and PCB resistance

losses due to IR drops

+VOUT

+SENSE

−

SENSE

-VOUT

−V

ON/OFF

CONTROL

Sense Current

IOUT

Sense Return

IOUT Return

Soldering Guidelines

Murata Power Solutions recommends the speciﬁ cations below when installing these

converters. These speciﬁ cations vary depending on the solder type. Exceeding these

speciﬁ cations may cause damage to the product. Be cautious when there is high atmo-

spheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). Your

production environment may differ; therefore please thoroughly review these guidelines

with your process engineers.

Wave Solder Operations for through-hole mounted products (THMT)

For Sn/Ag/Cu based solders:

Maximum Preheat Temperature 115° C.

Maximum Pot Temperature 270° C.

Maximum Solder Dwell Time 7 seconds

For Sn/Pb based solders:

Maximum Preheat Temperature 105° C.

Maximum Pot Temperature 250° C.

Maximum Solder Dwell Time 6 seconds

This is done by correcting IR voltage drops along the output wiring and the

current carrying capacity of PC board etch. This output drop (the difference

between Sense and Vout when measured at the converter) should not exceed

0.5V. Consider using heavier wire if this drop is excessive. Sense inputs also

improve the stability of the converter and load system by optimizing the control

loop phase margin.

Note: The Sense input and power Vout lines are internally connected through

low value resistors to their respective polarities so that the converter can

operate without external connection to the Sense. Nevertheless, if the Sense

function is not used for remote regulation, the user should connect +Sense to

+Vout and –Sense to –Vout at the converter pins.

The remote Sense lines carry very little current. They are also capacitively

coupled to the output lines and therefore are in the feedback control loop to

regulate and stabilize the output. As such, they are not low impedance inputs

and must be treated with care in PC board layouts. Sense lines on the PCB

should run adjacent to DC signals, preferably Ground. In cables and discrete

wiring, use twisted pair, shielded tubing or similar techniques.

Any long, distributed wiring and/or signiﬁ cant inductance introduced into the

Sense control loop can adversely affect overall system stability. If in doubt, test

your applications by observing the converter’s output transient response during

step loads. There should not be any appreciable ringing or oscillation. You

may also adjust the output trim slightly to compensate for voltage loss in any

external ﬁ lter elements. Do not exceed maximum power ratings.

Please observe Sense inputs tolerance to avoid improper operation:

[Vout(+) −Vout(-)] − [Sense(+) −Sense(-)] ≤ 10% of Vout

Output overvoltage protection is monitored at the output voltage pin, not the

Sense pin. Therefore excessive voltage differences between Vout and Sense

together with trim adjustment of the output can cause the overvoltage protec-

tion circuit to activate and shut down the output.

Power derating of the converter is based on the combination of maximum

output current and the highest output voltage. Therefore the designer must

ensure:

(Vout at pins) x (Iout) ≤ (Max. rated output power)

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 25 of 26

www.murata-ps.com/support

Emissions Performance

Murata Power Solutions measures its products for conducted emissions

against the EN 55022 and CISPR 22 standards. Passive resistance loads are

employed and the output is set to the maximum voltage. If you set up your

own emissions testing, make sure the output load is rated at continuous power

while doing the tests.

The recommended external input and output capacitors (if required) are

included. Please refer to the fundamental switching frequency. All of this

information is listed in the Product Speciﬁ cations. An external discrete ﬁ lter is

installed and the circuit diagram is shown below.

[1] Conducted Emissions Parts List

[2] Conducted Emissions Test Equipment Used

Hewlett Packard HP8594L Spectrum Analyzer – S/N 3827A00153

2Line V-networks LS1-15V 50/50Uh Line Impedance Stabilization Network

[3] Conducted Emissions Test Results

[4] Layout Recommendations

Most applications can use the ﬁ ltering which is already installed inside the

converter or with the addition of the recommended external capacitors. For

greater emissions suppression, consider additional ﬁ lter components and/or

shielding. Emissions performance will depend on the user’s PC board layout,

the chassis shielding environment and choice of external components. Please

refer to Application Note GEAN-02 for further discussion.

Since many factors affect both the amplitude and spectra of emissions, we

recommend using an engineer who is experienced at emissions suppression.

Reference Part Number Description Vendor

C1, C2, C3, C4, C5 GRM32ER72A105KA01L SMD CERAMIC-100V-

1000nF-X7R-1210 Murata

C6 GRM319R72A104KA01D SMD CERAMIC100V-100nF-

±10%-X7R-1206 Murata

L1, L2 PG0060T COMMON MODE-473uH-

±25%-14A Pulse

C8, C9, C10, C11 GRM55DR72J224KW01L SMD CERAMIC630V-0.22uF-

±10%-X7R-2220 Murata

C7 UHE2A221MHD Aluminum100V-220Uf-

±10%-long lead Nichicon

C12 NA

LOAD

C2 L1

C6 C7 DC/DC C12

VCC

RTN

-48V

GND

C3C1 L2

C5C4

C8 C9 C10 C11

Figure 7. Conducted Emissions Test Circuit

Graph 1. Conducted emissions performance, Positive Line,

CISPR 22, Class B, full load

Graph 2. Conducted emissions performance, Negative Line,

CISPR 22, Class B, full load

Figure 8. Vertical Wind Tunnel

IR Video

Camera

IR Transparent

optical window Variable

speed fan

Heating

element

Ambient

temperature

sensor

Airﬂow

collimator

Precision

low-rate

anemometer

3” below UUT

Unit under

test (UUT)

Vertical Wind Tunnel

Murata Power Solutions employs a computer controlled

custom-designed closed loop vertical wind tunnel, infrared

video camera system, and test instrumentation for accurate

airﬂ ow and heat dissipation analysis of power products.

The system includes a precision low ﬂ ow-rate anemometer,

variable speed fan, power supply input and load controls,

temperature gauges, and adjustable heating element.

The IR camera monitors the thermal performance of the

Unit Under Test (UUT) under static steady-state conditions. A

special optical port is used which is transparent to infrared

wavelengths.

Both through-hole and surface mount converters are

soldered down to a 10"x10" host carrier board for realistic

heat absorption and spreading. Both longitudinal and trans-

verse airﬂ ow studies are possible by rotation of this carrier

board since there are often signiﬁ cant differences in the heat

dissipation in the two airﬂ ow directions. The combination of

adjustable airﬂ ow, adjustable ambient heat, and adjustable

Input/Output currents and voltages mean that a very wide

range of measurement conditions can be studied.

The collimator reduces the amount of turbulence adjacent

to the UUT by minimizing airﬂ ow turbulence. Such turbu-

lence inﬂ uences the effective heat transfer characteristics

and gives false readings. Excess turbulence removes more

heat from some surfaces and less heat from others, possibly

causing uneven overheating.

Both sides of the UUT are studied since there are differ-

ent thermal gradients on each side. The adjustable heating

element and fan, built-in temperature gauges, and no-contact

IR camera mean that power supplies are tested in real-world

conditions.

DRQ-12/50-L48 Series

600W Digital Fully Regulated

Intermediate DC-DC Bus Converter

MDC_DRQ-12/50-L48NK.B03 Page 26 of 26

www.murata-ps.com/support

Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other

technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply

the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Speciﬁ cations are subject to change

Murata Power Solutions, Inc.

129 Flanders Road, Westborough, MA 01581 U.S.A.

ISO 9001 and 14001 REGISTERED

This product is subject to the following operating requirements

and the Life and Safety Critical Application Sales Policy:

Refer to: http://www.murata-ps.com/requirements/