ULS-12/2.5-D48P-C - Murata - Product.Network

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ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 1 of 24

FEATURES

Small footprint DC/DC converter, ideal for

high current applications

Tiny 0.9" x 1.3" x 0.40" open frame package

Industry standard DOSA "brick" format

and pinout with surface mount option

36-75 Volts DC input range

2250 Volt Basic input/output isolation

(48V models)

Up to 66 Watts total output power with

overtemperature shutdown

High efﬁ ciency synchronous rectiﬁ er forward

topology

Stable no-load operation with no required

external components

Operating temperature range -40 to +85°C

with derating

Certiﬁ ed to UL 60950-1, CSA-C22.2 No. 234,

EN60950-1 safety approvals, 2nd Edition

Extensive self-protection shut down features

The world of “brick” DC/DC converters has seen

a steady size reduction. The ULS series makes

another dramatic size shrink down to a “sixteenth-

brick” width (0.9 inches) while still retaining up

to 66Watt output and full 2250 Volt DC isolation.

The PC-board mount converter family accepts

36to 75 Volts DC inputs and delivers ﬁ xed outputs

regulated to within ±0.2%. The ULS converters

are ideal for datacom and telecom applications,

cell phone towers, data centers, server farms and

network repeaters.

ULS outputs may be trimmed within ±10% of

nominal output while delivering fast settling to

current step loads and no adverse effects from

higher capacitive loads. Excellent ripple and noise

speciﬁ cations assure compatibility to circuits using

CPU’s, ASIC’s, programmable logic and FPGA’s. No

minimum load is required. For systems requiring

controlled startup/shutdown, an external remote

On/Off control may use a switch, transistor or digital

logic. Remote Sense inputs compensate for resis-

tive line drops at high currents.

Many self-protection features on the ULS series

avoid both converter and external circuit hazards.

These include input undervoltage lockout and

overtemperature shutdown. The outputs current

limit using the “hiccup” autorestart technique and

the outputs may be short-circuited indeﬁ nitely.

Additional features include output overvoltage and

reverse conduction elimination.

The synchronous rectiﬁ er forward topology yields

high efﬁ ciency for minimal heat buildup and “no

fan” operation.

PRODUCT OVERVIEW

SWITCH

CONTROL

PWM

CONTROLLER

OPTO

ISOLATION

REFERENCE

ERROR AMP

+Vin

(1)

-Vin

(3)

Vout

TRIM

(6)

-SENSE

(5)

-Vout

(4)

+Vout

(8)

REMOTE

ON/OFF

CONTROL

(2)

INPUT

UNDER VOLTAGE,

OVER TEMPERATURE,

AND OUTPUT

OVER VOLTAGE

COMPARATORS

PULSE

TRANSFORMER

+SENSE

(7)

Typical topology is shown

Typical unit

Figure 1. Simpliﬁ ed Block Diagram

REG.-Nr. D216

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PART NUMBER STRUCTURE

ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 2 of 24

PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE M

Root Model M

Output Input Efﬁ ciency C76

Package

VOUT

(V)

IOUT

(A, max.)

Power

(W)

R/N (mV pk-pk) NRegulation (max.) PVIN Nom.

(V)

Range

(V)

IIN, no load

(mA)

IIN, full

load (A)

Typ. Max. Line Load Min. Typ. Case (inches)

ULS-3.3/20-D48N-C 3.3 20 66 70 120 ±0.1% ±0.2% 48 36-75 20 1.53 89% 90% 0.9x1.3x0.40

ULS-5/12-D48N-C 5 12 60 50 80 ±0.125% ±0.25% 48 36-75 40 1.39 88% 90% 0.9x1.3x0.40

ULS-12/5-D48N-C 12 5 60 80 120 ±0.125% ±0.25% 48 36-75 50 1.37 88% 91% 0.9x1.3x0.40

Maximum Rated Output Current

Current in Amps

Sixteenth Brick Series

Nominal Output Voltage:

ULS -/D48-3.3 20 N

Input Voltage Range:

D48 = 36-75 Volts (48V nominal)

On/Off Control Logic:

N = Negative

P = Positive

Conformal Coating:

Blank = No coating, standard

H = Coating added, optional special order

M Please refer to the Part Number Structure when ordering.

N These speciﬁ cations are preliminary. Contact Murata Power Solutions for availability.

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

speciﬁ cations. Output capacitors are 1 μF ceramic multilayer in parallel with 10 μF electrolytic.

I/O caps are necessary for our test equipment and may not be needed for your application.

➃ Regulation speciﬁ cations describe output voltage deviations from a nominal/midpoint value to either

extreme (50% load step).

RoHS Hazardous Substance Compliance

(does not claim EU RoHS exemption 7b–lead in solder)

C = RoHS-6

Y = RoHS-5

Pin Length Option (Thru-hole only)

Blank = Standard pin length 0.180˝ (4.6mm)

L1 = 0.110˝ (2.79mm)*

L2 = 0.145˝ (3.68mm)*

SMT Version

Blank = Through-hole mount, no SMT

M = Surface mount (MSL Rating 3)

Note:

Some model number combinations

may not be available. Please contact

Murata Power Solutions.

*Special quantity order is required;

no sample quantities available.

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ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 3 of 24

FUNCTIONAL SPECIFICATIONS, ULS-3.3/20-D48

ABSOLUTE MAXIMUM RATINGS Conditions ➀Minimum Typical/Nominal Maximum Units

Input Voltage, Continuous Full power operation 80 Vdc

Input Voltage, Transient Operating or non-operating, tested:

100 mS max. duration 100 Vdc

Isolation Voltage Input to output 2250 Vdc

Input Reverse Polarity None, install external fuse None Vdc

On/Off Remote Control Power on, referred to -Vin 0 15 Vdc

Output Power 0 66.66 W

Output Current Current-limited, no damage,

short-circuit protected 020A

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

Operating voltage range 36 48 75 Vdc

Recommended External Fuse Fast blow 4 A

Start-up threshold, turn on Rising input voltage 33.5 34.5 35.5 Vdc

Undervoltage shutdown, turn off 12 Falling input voltage 31.5 32.5 33.5 Vdc

Overvoltage protection NA Vdc

Reverse Polarity Protection None, install external fuse None Vdc

Internal Filter Type Capacitive

Input current

Full Load Conditions Vin = nominal 1.53 1.56 A

Low Line Vin = minimum 2.08 2.15 A

Inrush Transient 0.05 A2-Sec.

Output in Short Circuit 150 300 mA

No Load input current Iout = minimum, unit=ON 30 100 mA

Shut-Down Mode Input Current 515mA

Reﬂ ected (back) ripple current ➁no ﬁ ltering 150 210 mAp-p

Reﬂ ected (back) ripple current ➁Measured at input with speciﬁ ed ﬁ lter 20 30 mAp-p

Pre-biased startup External output voltage < Vset

The converter will

start if the external

load pre-bias does

not exceed Vnom

GENERAL and SAFETY

Efﬁ ciency Vin=48V, full load 89 90 %

Vin=Min 86 88 %

Isolation

Isolation Voltage, input to output 2250 Vdc

Insulation Safety Rating basic

Isolation Resistance 100 M

Isolation Capacitance 1000 pF

Safety (meets the following requirements) UL-60950-1, CSA-C22.2 No.60950-1,

IEC/EN60950-1, 2nd Edition Yes

Calculated MTBF Per MIL-HDBK-217F, ground benign,

Tambient=+40°C TBD Hours x 103

Calculated MTBF ➃Per Telcordia SR332, issue 1, class 3, ground

ﬁ xed, Tambient=+40°C 3200 Hours x 103

DYNAMIC CHARACTERISTICS

Fixed Switching Frequency 480 500 520 KHz

Startup Time Power on, Vout regulated 5 15 mS

Startup Time Remote ON to Vout regulated 5 10 mS

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

1% of Vout. 50 150 µSec

Dynamic Load Peak Deviation same as above ±150 ±200 mV

FEATURES and OPTIONS

Remote On/Off Control

“N” sufﬁ x:

Negative Logic, ON state ON = Pin grounded or external voltage -0.1 0.8 V

Negative Logic, OFF state OFF = Pin open or external voltage 2.5 15 V

Control Current open collector/drain 1 2 mA

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ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 4 of 24

FEATURES and OPTIONS (cont.) Conditions ➀Minimum Typical/Nominal Maximum Units

Remote On/Off Control (cont.)

“P” sufﬁ x:

Positive Logic, ON state ON = Pin open or external voltage 3.5 15 V

Positive Logic, OFF state OFF = Ground pin or external voltage 0 1 V

Control Current open collector/drain 1 2 mA

OUTPUT

Total Output Power 0 66 66.66 W

Voltage

Nominal Output Voltage ➂ No trim 3.267 3.3 3.333 Vdc

Settling Accuracy At 50% load -1 1 % of Vset

Output Voltage Range ➇User-adjustable -10 10

Overvoltage Protection Via magnetic feedback 3.75 4.25 4.95 Vdc

Remote Sense Compensation Of Vset 10 %

Current

Output Current Range 02020A

Minimum Load No minimum load

Current Limit Inception 98% of Vnom., cold condition 22 26 30 A

Short Circuit ➄

Short Circuit Current Hiccup technique, autorecovery within ±1%

of Vout 6.6 A

Short Circuit Duration

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

Short circuit protection method Hiccup current limiting

Regulation

Line Regulation ➆Vin=min. to max., Vout=nom., nom load ±0.1 V

Load Regulation ➆Iout=min. to max ±0.2 V

Ripple and Noise 5 Hz- 20 MHz BW 70 120 mV pk-pk

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

Maximum Capacitive Loading

(10% ceramic, 90% Oscon) Low ESR, .02 ohms max (resistive load) 1000 F

MECHANICAL (Through Hole Models)

Outline Dimensions Cxx case 1.3x0.9x0.4 Inches

(Please refer to outline drawing) WxLxH 33x22.9x10.2 mm

Weight 0.58 Ounces

16.4 Grams

Through Hole Pin Diameter .062 & .04 Inches

1.575 & 1.016 mm

Through Hole Pin Material

Gold-plated copper

alloy with nickel

underplate

TH Pin Plating Metal and Thickness Nickel subplate 50 µ-inches

Gold overplate 5 µ-inches

ENVIRONMENTAL

Operating Ambient Temperature Range No derating, full power, 200 LFM,

no condensation -40 85 °C

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

Operating Case Temp No derating required -40 120 °C

Thermal Protection/Shutdown Measured at hotspot 110 115 120 °C

Electromagnetic Interference External ﬁ lter is required

Conducted, EN55022/CISPR22 B Class

Radiated, EN55022/CISPR22 B Class

RoHS rating RoHS-6

FUNCTIONAL SPECIFICATIONS, ULS-3.3/20-D48 (CONT.)

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TYPICAL PERFORMANCE DATA, ULS-3.3/20-D48

ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 5 of 24

Maximum Current Temperature Derating at Sea Level

(VIN = 48V, longitudinal airﬂ ow)

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

100

3 4 6 8 10 12 14 16 18 20

VIN = 75V

VIN = 48V

VIN = 36V

Efﬁciency (%)

Load Current (Amps)

30 35 40 45 50 55 60 65 70 75 80 85

Output Current (Amps)

Ambient Temperature (ºC)

Natural convection

0.5 m/s (100 LFM)

1.0 m/s (200 LFM)

1.5 m/s (300 LFM)

2.0 m/s (400 LFM)

(Resistive loads 50% with +25% step Vin=48V)

Transient Response (Load from 75% to 50%)

Enable Start-up

Enable Start-up (Vin=48V Iout=20A)

Transient Response (Load from 50% to 75%)

Enable Start-up (Vin=48V Iout=0A)

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ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 6 of 24

TYPICAL PERFORMANCE DATA, ULS-3.3/20-D48 (CONT.)

Ripple and Noise (1uF Ceramic and 10uF Tantalum Capcitors)

R/N Waveform (Vin=48V Iout=20A) R/N Waveform (Vin=48V Iout=0A)

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ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 7 of 24

FUNCTIONAL SPECIFICATIONS, ULS-5/12-D48

ABSOLUTE MAXIMUM RATINGS Conditions ➀Minimum Typical/Nominal Maximum Units

Input Voltage, Continuous Full power operation 80 Vdc

Input Voltage, Transient Operating or non-operating, tested:

100 mS max. duration 100 Vdc

Isolation Voltage Input to output 2250 Vdc

Input Reverse Polarity None, install external fuse None Vdc

On/Off Remote Control Power on, referred to -Vin 0 15 Vdc

Output Power 0 60.6 W

Output Current Current-limited, no damage,

short-circuit protected 012A

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

Operating voltage range 36 48 75 Vdc

Recommended External Fuse Fast blow 4 A

Start-up threshold, turn on Rising input voltage 33 34.5 35.5 Vdc

Undervoltage shutdown, turn off 12 Falling input voltage 31 32.5 33.5 Vdc

Overvoltage protection NA Vdc

Reverse Polarity Protection None, install external fuse None Vdc

Internal Filter Type LC

Input current

Full Load Conditions Vin = nominal 1.39 1.43 A

Low Line Vin = minimum 1.85 1.91 A

Inrush Transient 0.05 A2-Sec.

Output in Short Circuit 100 200 mA

No Load input current Iout = minimum, unit=ON 40 80 mA

Shut-Down Mode Input Current 510mA

Reﬂ ected (back) ripple current ➁no ﬁ ltering 400 500 mAp-p

Reﬂ ected (back) ripple current ➁Measured at input with speciﬁ ed ﬁ lter 25 35 mAp-p

Pre-biased startup External output voltage < Vset

The converter will

start if the external

load pre-bias does

not exceed Vnom

GENERAL and SAFETY

Efﬁ ciency Vin=48V, full load 88 90 %

Vin=Min 88 90 %

Isolation

Isolation Voltage, input to output 2250 Vdc

Insulation Safety Rating basic

Isolation Resistance 10 M

Isolation Capacitance 1000 pF

Safety (meets the following requirements) UL-60950-1, CSA-C22.2 No.60950-1,

IEC/EN60950-1, 2nd Edition Yes

Calculated MTBF Per MIL-HDBK-217F, ground benign,

Tambient=+40°C TBD Hours x 103

Calculated MTBF ➃Per Telcordia SR332, issue 1, class 3, ground

ﬁ xed, Tambient=+40°C 3200 Hours x 103

DYNAMIC CHARACTERISTICS

Fixed Switching Frequency 400 KHz

Startup Time Power on, Vout regulated 10 20 mS

Startup Time Remote ON to Vout regulated 10 20 mS

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

1% of Vout. 50 100 µSec

Dynamic Load Peak Deviation same as above ±200 ±250 mV

FEATURES and OPTIONS

Remote On/Off Control

“N” sufﬁ x:

Negative Logic, ON state ON = Pin grounded or external voltage -0.1 0.8 V

Negative Logic, OFF state OFF = Pin open or external voltage 2.5 15 V

Control Current open collector/drain 1 2 mA

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ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 8 of 24

FEATURES and OPTIONS (cont.) Conditions ➀Minimum Typical/Nominal Maximum Units

Remote On/Off Control (cont.)

“P” sufﬁ x:

Positive Logic, ON state ON = Pin open or external voltage 3.5 15 V

Positive Logic, OFF state OFF = Ground pin or external voltage 0 1 V

Control Current open collector/drain 1 2 mA

OUTPUT

Total Output Power 0 60 60.6 W

Voltage

Nominal Output Voltage ➂ No trim 4.95 5 5.05 Vdc

Settling Accuracy At 50% load -1 1 % of Vset

Output Voltage Range ➇User-adjustable -10 10

Overvoltage Protection Via magnetic feedback 6 6.5 7.2 Vdc

Remote Sense Compensation Of Vset 10 %

Current

Output Current Range 01212A

Minimum Load No minimum load

Current Limit Inception 98% of Vnom., after warm up 14 16 19 A

Short Circuit ➄

Short Circuit Current Hiccup technique, autorecovery within ±1%

of Vout 0.5 1 A

Short Circuit Duration

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

Short circuit protection method Hiccup current limiting

Regulation

Line Regulation ➆Vin=min. to max., Vout=nom., nom load ±0.125 V

Load Regulation ➆Iout=min. to max ±0.25 V

Ripple and Noise 5 Hz- 20 MHz BW 50 100 mV pk-pk

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

Maximum Capacitive Loading

(10% ceramic, 90% Oscon) Low ESR, .02 ohms max (resistive load) 220 1000 F

MECHANICAL (Through Hole Models)

Outline Dimensions Cxx case 1.3x0.9x0.4 Inches

(Please refer to outline drawing) WxLxH 33x22.9x10.2 mm

Weight 0.58 Ounces

16.4 Grams

Through Hole Pin Diameter .062 & .04 Inches

1.575 & 1.016 mm

Through Hole Pin Material

Gold-plated copper

alloy with nickel

underplate

TH Pin Plating Metal and Thickness Nickel subplate 50 µ-inches

Gold overplate 5 µ-inches

ENVIRONMENTAL

Operating Ambient Temperature Range No derating, full power, 200 LFM,

no condensation -40 85 °C

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

Operating Case Temp No derating required -40 120 °C

Thermal Protection/Shutdown Measured at hotspot 110 115 130 °C

Electromagnetic Interference External ﬁ lter is required

Conducted, EN55022/CISPR22 A Class

Radiated, EN55022/CISPR22 A Class

RoHS rating RoHS-6

FUNCTIONAL SPECIFICATIONS, ULS-5/12-D48 (CONT.)

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TYPICAL PERFORMANCE DATA, ULS-5/12-D48

ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 9 of 24

Maximum Current Temperature Derating at Sea Level

(VIN = 48V, airﬂ ow is from Vin to Vout)

Efﬁ ciency and Power Dissipation @ 25°C

100

3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0

VIN = 75V

VIN = 48V

VIN = 36V

Power Dissipation

(Vin = 48V)

Efﬁciency (%)

Load Current (Amps)

Power Dissipation (Watts)

30 35 40 45 50 55 60 65 70 75 80 85

Natural convection

Output Current (Amps)

Ambient Temperature (ºC)

Enable Start-up (Vin=48V, Iout=12A, Cload=1000uF, Ta=+25°C)

Trace 2=Output, Trace 4= Enable.

Enable Start-up (Vin=48V, Iout=12A, Ta=+25°C) Trace 2=Output, Trace 4= Enable. Enable Start-up (Vin=48V, Iout=0A, Ta=+25°C) Trace 2=Output, Trace 4= Enable.

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TYPICAL PERFORMANCE DATA, ULS-5/12-D48 (CONT.)

Transient Response (Vin=48V, Iout=50-75-50% of Imax)

(Recovery time=9.6uS)

Transient Response (Vin=48V, Iout=50-75-50% of Imax)

(Recovery time=10uS)

Thermal image with hot spot at full load with 85 °C ambient; air is ﬂ owing at 400LFM. Air

if ﬂ owing across the converter from +V to -V at 48V input. Identiﬁ able and recommended

value to be veriﬁ ed in application. (Q2, max temp=120 °C/IPC9592 guidelines)

Output and Ripple Noise (Vin=48V, Iout=12A, 1uF Ceramic and 10uF tantalum capacitors) Output and Ripple Noise (Vin=48V, Iout=0A, 1uF Ceramic and 10uF tantalum capacitors)

ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 10 of 24

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ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 11 of 24

FUNCTIONAL SPECIFICATIONS, ULS-12/5-D48

ABSOLUTE MAXIMUM RATINGS Conditions ➀Minimum Typical/Nominal Maximum Units

Input Voltage, Continuous Full power operation 80 Vdc

Input Voltage, Transient Operating or non-operating, tested:

100 mS max. duration 100 Vdc

Isolation Voltage Input to output 2250 Vdc

Input Reverse Polarity None, install external fuse None Vdc

On/Off Remote Control Power on, referred to -Vin 0 15 Vdc

Output Power 0 60.6 W

Output Current Current-limited, no damage,

short-circuit protected 05A

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

Operating voltage range 36 48 75 Vdc

Recommended External Fuse Fast blow 4 A

Start-up threshold, turn on Rising input voltage 33 34.5 35.5 Vdc

Undervoltage shutdown, turn off 12 Falling input voltage 31 32.5 33.5 Vdc

Overvoltage protection NA Vdc

Reverse Polarity Protection None, install external fuse None Vdc

Internal Filter Type Capacitance

Input current

Full Load Conditions Vin = nominal 1.37 1.43 A

Low Line Vin = minimum 1.83 1.89 A

Inrush Transient 0.05 A2-Sec.

Output in Short Circuit 100 200 mA

No Load input current Iout = minimum, unit=ON 50 150 mA

Shut-Down Mode Input Current 15 25 mA

Reﬂ ected (back) ripple current ➁no ﬁ ltering 150 200 mAp-p

Reﬂ ected (back) ripple current ➁Measured at input with speciﬁ ed ﬁ lter 15 30 mAp-p

Pre-biased startup External output voltage < Vset

The converter will

start if the external

load pre-bias does

not exceed Vnom

GENERAL and SAFETY

Efﬁ ciency Vin=48V, full load 88 91 %

Vin=Min 89 90 %

Isolation

Isolation Voltage, input to output 2250 Vdc

Insulation Safety Rating basic

Isolation Resistance 100 M

Isolation Capacitance 1000 pF

Safety (meets the following requirements) UL-60950-1, CSA-C22.2 No.60950-1,

IEC/EN60950-1, 2nd Edition Yes

Calculated MTBF Per MIL-HDBK-217F, ground benign,

Tambient=+40°C TBD Hours x 103

Calculated MTBF ➃Per Telcordia SR332, issue 1, class 3, ground

ﬁ xed, Tambient=+40°C 3200 Hours x 103

DYNAMIC CHARACTERISTICS

Fixed Switching Frequency 470 520 570 KHz

Startup Time Power on, Vout regulated 30 mS

Startup Time Remote ON to Vout regulated 30 mS

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

1% of Vout. 25 50 µSec

Dynamic Load Peak Deviation same as above ±180 ±240 mV

FEATURES and OPTIONS

Remote On/Off Control

“N” sufﬁ x:

Negative Logic, ON state ON = Pin grounded or external voltage -0.1 0.8 V

Negative Logic, OFF state OFF = Pin open or external voltage 2.5 15 V

Control Current open collector/drain 1 2 mA

www.murata-ps.com/support

ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 12 of 24

FEATURES and OPTIONS (cont.) Conditions ➀Minimum Typical/Nominal Maximum Units

Remote On/Off Control (cont.)

“P” sufﬁ x:

Positive Logic, ON state ON = Pin open or external voltage 3.5 15 V

Positive Logic, OFF state OFF = Ground pin or external voltage 0 1 V

Control Current open collector/drain 1 2 mA

OUTPUT

Total Output Power 0 60 60.6 W

Voltage

Nominal Output Voltage ➂ No trim 11.88 12 12.12 Vdc

Settling Accuracy At 50% load -1 1 % of Vset

Output Voltage Range ➇User-adjustable -10 10

Overvoltage Protection Via magnetic feedback 13.3 14.5 18 Vdc

Remote Sense Compensation Of Vset 10 %

Current

Output Current Range 055A

Minimum Load No minimum load

Current Limit Inception 98% of Vnom., after warm up 5.5 6.8 8 A

Short Circuit ➄

Short Circuit Current Hiccup technique, autorecovery within ±1%

of Vout 0.6 A

Short Circuit Duration

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

Short circuit protection method Hiccup current limiting

Regulation

Line Regulation ➆Vin=min. to max., Vout=nom., nom load ±0.125 V

Load Regulation ➆Iout=min. to max ±0.25 V

Ripple and Noise 5 Hz- 20 MHz BW 80 120 mV pk-pk

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

Maximum Capacitive Loading

(10% ceramic, 90% Oscon) Low ESR, .02 ohms max (resistive load) 1000 F

Maximum Capacitive Loading loads: CC mode F

MECHANICAL (Through Hole Models)

Outline Dimensions Cxx case 1.3x0.9x0.4 Inches

(Please refer to outline drawing) WxLxH 33x22.9x10.2 mm

Weight 0.58 Ounces

16.4 Grams

Through Hole Pin Diameter .062 & .04 Inches

1.575 & 1.016 mm

Through Hole Pin Material

Gold-plated copper

alloy with nickel

underplate

TH Pin Plating Metal and Thickness Nickel subplate 50 µ-inches

Gold overplate 5 µ-inches

ENVIRONMENTAL

Operating Ambient Temperature Range No derating, full power, 200 LFM,

no condensation -40 85 °C

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

Operating Case Temp No derating required -40 105 °C

Thermal Protection/Shutdown Measured at hotspot 115 125 130 °C

Electromagnetic Interference External ﬁ lter is required

Conducted, EN55022/CISPR22 B Class

Radiated, EN55022/CISPR22 B Class

RoHS rating RoHS-6

FUNCTIONAL SPECIFICATIONS, ULS-12/5-D48 (CONT.)

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ULS 60-Watt Series

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MDC_ULS Series.B27 Page 13 of 24

Performance Speciﬁ cation Notes

➀ All speciﬁ cations are typical unless noted. Ambient temperature =

+25°Celsius, VIN is nominal, output current is maximum rated nominal.

External output capacitance is 1 µF multilayer ceramic paralleled with

10µF electrolytic. All caps are low ESR. These capacitors are necessary for

our test equipment and may not be needed in your application.

Testing must be kept short enough that the converter does not appreciably

heat up during testing. For extended testing, use plenty of airﬂ ow. See

Derating Curves for temperature performance. All models are stable and

regulate within spec without external cacacitance.

➁ Input Ripple Current is tested and speciﬁ ed over a 5-20 MHz bandwidth

and uses a special set of external ﬁ lters only for the Ripple Current speci-

ﬁ cations. Input ﬁ ltering is CIN = 33 µF, CBUS = 220 µF, LBUS = 12µH. Use

capacitor rated voltages which are twice the maximum expected voltage.

Capacitors must accept high speed AC switching currents.

➂ Note that Maximum Current Derating Curves indicate an average current

at nominal input voltage. At higher temperatures and/or lower airﬂ ow, the

converter will tolerate brief full current outputs if the average RMS current

over time does not exceed the Derating curve. All Derating curves are

presented at sea level altitude. Be aware of reduced power dissipation

with increasing density altitude.

➃ Mean Time Before Failure (MTBF) is calculated using the Telcordia

(Belcore) SR-332 Method 1, Case 3, Issue 1, ground ﬁ xed conditions. Oper-

ating temperature = +30°C, full output load, natural air convection.

➄ The output may be shorted to ground indeﬁ nitely with no damage. The

Output Short Circuit Current shown in the speciﬁ cations is an average con-

sisting of very short bursts of full rated current to test whether the output

circuit can be repowered.

➅ The On/Off Control is normally driven from a switch or relay. An open

collector/open drain transistor may be used in saturation and cut-off

(pinch-off) modes. External logic may also be used if voltage levels are

fully compliant to the speciﬁ cations.

➆ Regulation speciﬁ cations describe the deviation as the input line voltage

or output load current is varied from a nominal midpoint value to either

extreme (50% load).

➇ Do not exceed maximum power ratings, Sense limits or output overvoltage

when adjusting output trim values.

➈ At zero output current, Vout may contain components which slightly

exceed the ripple and noise speciﬁ cations.

➉ Output overload protection is non-latching. When the output overload

is removed, the output will automatically recover.

All models are fully operational and meet published speciﬁ cations,

including “cold start” at –40°C.

The converter will shut off if the input falls below the undervoltage thresh-

old. It will not restart until the input exceeds the Input Start Up Voltage.

Short circuit shutdown begins when the output voltage degrades approxi-

mately 2% from the selected setting.

Output noise may be further reduced by installing an external ﬁ lter. See

the Application Notes. Use only as much output ﬁ ltering as needed and no

more. Larger caps (especially low-ESR ceramic types) may slow transient

response or degrade dynamic performance. Thoroughly test your applica-

tion with all components installed.

To avoid damage or unplanned shutdown, do not sink appreciable reverse

output current.

If reverse polarity is accidentally applied to the input, always connect an

external fast blow input fuse in series with the +VIN input.

Although extremely unlikely, failure of the internal components of this

product may expose external application circuits to dangerous voltages,

currents, temperatures or power levels. Please thoroughly verify all appli-

cations before committing them to service. Be sure to include appropri-

ately rated FUSES (see speciﬁ cations and Application Notes) to reduce the

risk of failure.

If Sense is not wired to an external load, connect sense pins to their

respective Vout pins. Do not leave sense unconnected.

All models use ﬁ xed switching frequencies.

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TYPICAL PERFORMANCE DATA, ULS-12/5-D48

ULS 60-Watt Series

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Isolated DC/DC Converters

MDC_ULS Series.B27 Page 14 of 24

Maximum Current Temperature Derating at Sea Level

(VIN = 48V, airﬂ ow is from Vin to Vout)

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

100

0.50 0.95 1.40 1.85 2.30 2.75 3.20 3.65 4.10 4.55 5.00

VIN = 75V

VIN = 48V

VIN = 36V

Power Dissipation

(Vin = 48V)

Efﬁciency (%)

Load Current (Amps)

Loss (Watts)

30 35 40 45 50 55 60 65 70 75 80 85

Natural convection

0.5 m/s (100 LFM)

1.0 m/s (200 LFM)

1.5 m/s (300 LFM)

2.0 m/s (400 LFM)

Output Current (Amps)

Ambient Temperature (ºC)

Enable Start-up (Vin=48V, Iout=5A, Cload=1000uF Ta=+25°C) Trace 2=Output,

Trace 4= Enable.

Enable Start-up (Vin=48V, Iout=5A, Ta=+25°C) Trace 2=Output, Trace 4= Enable. Enable Start-up (Vin=48V, Iout=0A, Ta=+25°C) Trace 2=Output, Trace 4= Enable.

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TYPICAL PERFORMANCE DATA, ULS-12/5-D48 (CONT.)

Transient Response (Vin=48V, Iout=50-75-50% of Imax)

(Delta=170mv, Recovery time=16uS)

Output and Ripple Noise (Vin=48V, Iout=0A, 1uF Ceramic and 10uF tantalum capacitors)

Transient Response (Vin=48V, Iout=50-75-50% of Imax)

(-Delta=183.12mV, Recovery time=18.2uS)

Output and Ripple Noise (Vin=48V, Iout=5A, 1uF Ceramic and 10uF tantalum capacitors)

Thermal image with hot spot at full load with 85 °C ambient; air is ﬂ owing at 400LFM. Air

if ﬂ owing across the converter from -V to +V at 48V input. Identiﬁ able and recommended

value to be veriﬁ ed in application. (Q2, max temp=120 °C/IPC9592 guidelines)

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MECHANICAL SPECIFICATIONS, THROUGH-HOLE MOUNT

ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 16 of 24

INPUT/OUTPUT CONNECTIONS P75

Pin Function Pin Function

3 -Vin 4 -Vout

5 –Sense In

2 On/Off Control 6 Trim

7 +Sense In

1 +Vin 8 +Vout

Important! Always connect the sense pins. If they

are not connected to a remote load, wire each

sense pin to its respective voltage output at the

converter pins.

The 0.145-inch pin length is shown. Please refer to

the part number structure for alternate pin lengths.

Pin material: Copper alloy. Plating: Gold over nickel

Please note that some competitive units may use

different pin numbering or alternate outline views;

however, all units are plugin-compatible.

It is recommended that no parts be placed beneath

the converter

Third Angle Projection

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

Components are shown for reference only

and may vary between units.

Tolerances (unless otherwise speciﬁed):

.XX ± 0.02 (0.5)

.XXX ± 0.010 (0.25)

Angles ± 2˚

TOP VIEW

END VIEW

.90

22.9

.100 MIN

ANNULAR RING

FOR ALL PIN

SHOULDERS

.300

7.62

.300

7.62

1.100

[27.94]

1.30

11.7

.46

14.0

.55

3.81

.150

3.81

.150

RECOMMENDED FOOTPRINT

(VIEW THROUGH CONVERTER)

LFINISHED HOLE SIZES

@ PINS 4 & 8

(PER IPC-D-275, LEVEL C)

.070-.084

(SEC)

(PRI)

TOP VIEW

FINISHED HOLE SIZES

@ PINS 1-3, 6, 5*, 7*

(PER IPC-D-275, LEVEL C)

.048-.062

0.300 (7.62)

0.600 (15.24)

0.90 (22.9)

1.30 (33.0)

BOTTOM PIN VIEW

SIDE VIEW

1.100 (27.9)

0.145

(3.68)

0.136 ±0.005

0.400 (10.16) Max

0.030 (0.8) Min

PINS 1-3,5-7:

ĳ0.040±0.001(1.016±0.025)

PINS 4,8:

ĳ0.062±0.001(1.575±0.025)

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ULS 60-Watt Series

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MDC_ULS Series.B27 Page 17 of 24

SHIPPING TRAYS AND BOXES, THROUGH-HOLE MOUNT

Corner spacer

13.79 (350)

12.6 (320)

11.42 (290)

Anti-static foam

2 cartons

per box

128 units

per carton

256 units total per box

Each tray is 4 x 8 units

(32 units total per tray)

All materials in contact with the units are anti-static protective.

Dimensions are in inches (mm).

Corrugated

cardboard box

Label

128 units

SHIPPING TRAY DIMENSIONS

Material: Low density, closed cell polyethylene anti-static foam

4-C 0.26

(6.5)

0.87

(22.00)

0.59

(15.00)

0.91

(23.00)

9.84

(250.00)

9.84

(250.00)

0.47

(12.00)

0.24

(6.00)

0.51

(13.00)

1.34

(34.00)

1.97

(50.00)

0.31

(8.00)

R0.31

(8.00)

Third Angle Projection

Dimensions are in milimeters.

Tolerances (unless otherwise speciﬁed):

.XX ± 0.5

.XXX ± 0.25

Angles ± 2˚

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MECHANICAL SPECIFICATIONS, SURFACE MOUNT (MSL RATING 3).

Important! Always connect the sense pins. If they

are not connected to a remote load, wire each

sense pin to its respective voltage output at the

converter pins.

Pin material: Copper alloy. Plating: Gold over nickel

Please note that some competitive units may use

different pin numbering or alternate outline views;

however, all units are plugin-compatible.

It is recommended that no parts be placed beneath

the converter

Third Angle Projection

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

Components are shown for reference only

and may vary between units.

Tolerances (unless otherwise speciﬁed):

.XX ± 0.02 (0.5)

.XXX ± 0.010 (0.25)

Angles ± 2˚

TOP VIEW

END VIEW

BOTTOM PIN VIEW

SIDE VIEW

1.100 (27.9)

0.400 (10.16) Max

0.300 (7.62)

0.600 (15.24)

0.90 (22.9)

0.600 (15.24)

1.100

0.150 (3.8)0.020 (0.5) Min

0.062

(1.575)

1.30 (33.0)

.90

22.9

1.30

11.7

.46

14.0

.55 .070 MIN PAD

(6 OR 8 PLACES

AS REQUIRED)

3.81

.150

3.81

.150

7.62

.300

7.62

.300

27.94

1.100

RECOMMENDED FOOTPRINT

(VIEW THROUGH CONVERTER)

(SEC)

(PRI)

TOP VIEW

INPUT/OUTPUT CONNECTIONS P75

Pin Function Pin Function

3 -Vin 4 -Vout

5 –Sense In

2 On/Off Control 6 Trim

7 +Sense In

1 +Vin 8 +Vout

ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 18 of 24

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ULS 60-Watt Series

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MDC_ULS Series.B27 Page 19 of 24

Third Angle Projection

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

Components are shown for reference only.

Tolerances (unless otherwise speciﬁed):

.XX ± 0.02 (0.5)

.XXX ± 0.010 (0.25)

Angles ± 1˚

[2.0]

0.079

[18.92]

0.745

1.260

PITCH

32.00

NOZZLE

6-8mm

PICK-UP

Feed (Unwind)

Direction ----

Holes

Round

Holes

Pin #1

Oblong

1.732

44.00

.069

1.75

.512

13.00

330.20

13.00

4.00

CORE

101.60

Top Cover Tape

[9.65]

.38 REF

TAPE AND REEL

(200 UNITS

PER REEL)

1.73

REF

44.0

TAPE AND REEL INFORMATION

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ULS 60-Watt Series

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MDC_ULS Series.B27 Page 20 of 24

TECHNICAL NOTES

I/O Filtering, Input Ripple Current, and Output Noise

All models in the ULS Series are tested/speciﬁ ed for input reﬂ ected ripple

current and output noise using the speciﬁ ed external input/output components/

circuits and layout as shown in the following two ﬁ gures. External input capaci-

tors (CIN in Figure 2) serve primarily as energy-storage elements, minimiz-

ing line voltage variations caused by transient IR drops in conductors from

backplane to the DC/DC. Input caps should be selected for bulk capacitance

(at appropriate frequencies), low ESR, and high rms-ripple-current ratings. The

switching nature of DC/DC converters requires that dc voltage sources have

low ac impedance as highly inductive source impedance can affect system sta-

bility. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus. Your speciﬁ c

system conﬁ guration may necessitate additional considerations.

In critical applications, output ripple/noise (also referred to as periodic and

random deviations or PARD) may be reduced below speciﬁ ed limits using ﬁ lter-

ing techniques, the simplest of which is the installation of additional external

output capacitors. They function as true ﬁ lter elements and should be selected

for bulk capacitance, low ESR and appropriate frequency response.

All external capacitors should have appropriate voltage ratings and be

located as close to the converter as possible. Temperature variations for all

relevant parameters should also be taken carefully into consideration. The most

effective combination of external I/O capacitors will be a function of line voltage

and source impedance, as well as particular load and layout conditions.

Input Fusing

Certain applications and/or safety agencies may require the installation of

fuses at the inputs of power conversion components. Fuses should also be

used if the possibility of sustained, non-current-limited, input-voltage polarity

reversals exists. For DATEL ULS series DC/DC converters, we recommend the

use of a fast blow fuse, installed in the ungrounded input supply line with a

typical value about twice the maximum input current, calculated at low line

with the converter’s minimum efﬁ ciency.

All relevant national and international safety standards and regulations must

be observed by the installer. For system safety agency approvals, the convert-

ers must be installed in compliance with the requirements of the end- use

safety standard.

Input Reverse-Polarity Protection

If the input voltage polarity is accidentally reversed, an internal diode will

become forward biased and likely draw excessive current from the power

source. If this source is not current limited or the circuit appropriately fused, it

could cause permanent damage to the converter.

Input Under-Voltage Shutdown and Start-Up Threshold

Under normal start-up conditions, devices will not begin to regulate properly

until the ramping-up input voltage exceeds the Start-Up Threshold Voltage.

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

Under-Voltage Shutdown limit. Subsequent re-start will not occur until the input

is brought back up to the Start-Up Threshold. This built in hysteresis prevents

any unstable on/off situations from occurring at a single input voltage.

Start-Up Time

The VIN to VOUT Start-Up Time is the time interval between the point at which

the ramping input voltage crosses the Start-Up Threshold and the fully loaded

output voltage enters and remains within its speciﬁ ed accuracy band. Actual

measured times will vary with input source impedance, external input capaci-

tance, and the slew rate and ﬁ nal value of the input voltage as it appears at the

converter. The ULS Series implements a soft start circuit to limit the duty cycle

of its PWM controller at power up, thereby limiting the input inrush current.

The On/Off Control to VOUT start-up time assumes the converter has its

nominal input voltage applied but is turned off via the On/Off Control pin. The

speciﬁ cation deﬁ nes the interval between the point at which the converter is

turned on (released) and the fully loaded output voltage enters and remains

within its speciﬁ ed accuracy band. Similar to the VIN to VOUT start-up, the On/Off

Control to VOUT start-up time is also governed by the internal soft start circuitry

and external load capacitance. The difference in start up time from VIN to VOUT

and from On/Off Control to VOUT is therefore insigniﬁ cant.

Input Source Impedance

The input of ULS converters must be driven from a low ac-impedance source.

The DC/DC’s performance and stability can be compromised by the use of

highly inductive source impedances. The input circuit shown in Figure 2 is a

practical solution that can be used to minimize the effects of inductance in the

input traces. For optimum performance, components should be mounted close

to the DC/DC converter.

BUS

= 33μF, ESR < 700mΩ @ 100kHz

BUS

= 220μF, ESR < 100mΩ @ 100kHz

BUS

= 12μH

+VIN

–VIN

CURRENT

PROBE

OSCILLOSCOPE

–

Figure 2. Measuring Input Ripple Current

C1 = 1μF

C2 = 10μF

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

C2 RLOAD

SCOPE

+VOUT

–VOUT

+SENSE

–SENSE

Figure 3. Measuring Output Ripple/Noise (PARD)

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Remote Sense

Note: The Sense and VOUT lines are internally connected through low-value

resistors. Nevertheless, if the sense function is not used for remote regulation

the user should connect the +Sense to +VOUT and –Sense to –VOUT at the DC/

DC converter pins. ULS series converters employ a sense feature to provide

point of use regulation, thereby overcoming moderate IR drops in PCB conduc-

tors or cabling. The remote sense lines carry very little current and therefore

require minimal cross-sectional-area conductors. The sense lines, which are

capacitively coupled to their respective output lines, are used by the feedback

control-loop to regulate the output. As such, they are not low impedance points

and must be treated with care in layouts and cabling. Sense lines on a PCB

should be run adjacent to dc signals, preferably ground.

[VOUT(+)-VOUT(–)] – [Sense(+)-Sense(–)] d 10%VOUT

In cables and discrete wiring applications, twisted pair or other techniques

should be used. Output over-voltage protection is monitored at the output volt-

age pin, not the Sense pin. Therefore, excessive voltage differences between

VOUT and Sense in conjunction with trim adjustment of the output voltage can

cause the over-voltage protection circuitry to activate (see Performance Speci-

ﬁ cations for over-voltage limits). Power derating is based on maximum output

current and voltage at the converter’s output pins. Use of trim and sense func-

tions can cause output voltages to increase, thereby increasing output power

beyond the converter’s speciﬁ ed rating, or cause output voltages to climb into

the output over-voltage region. Therefore, the designer must ensure:

(VOUT at pins) x (IOUT) d rated output power

Floating Outputs

Since these are isolated DC/DC converters, their outputs are “ﬂ oating” with

respect to their input. Designers will normally use the –Output as the ground/

return of the load circuit. You can however, use the +Output as ground/return to

effectively reverse the output polarity.

Minimum Output Loading Requirements

ULS converters employ a synchronous-rectiﬁ er design topology and all models

regulate within spec and are stable under no-load to full load conditions.

Operation under no-load conditions however might slightly increase the output

ripple and noise.

Thermal Shutdown

The ULS converters are equipped with thermal-shutdown circuitry. If environ-

mental conditions cause the temperature of the DC/DC converter to rise above

the designed operating temperature, a precision temperature sensor will power

down the unit. When the internal temperature decreases below the threshold

of the temperature sensor, the unit will self start. See Performance/Functional

Speciﬁ cations.

Output Over-Voltage Protection

The ULS output voltage is monitored for an over-voltage condition using a com-

parator. The signal is optically coupled to the primary side and if the output volt-

age rises to a level which could be damaging to the load, the sensing circuitry

will power down the PWM controller causing the output voltage to decrease.

Following a time-out period the PWM will restart, causing the output voltage

to ramp to its appropriate value. If the fault condition persists, and the output

voltage again climbs to excessive levels, the over-voltage circuitry will initiate

another shutdown cycle. This on/off cycling is referred to as “hiccup” mode.

Current Limiting

As soon as the output current increases to approximately 130% of its rated

value, the DC/DC converter will go into a current-limiting mode. In this condi-

tion, the output voltage will decrease proportionately with increases in output

current, thereby maintaining somewhat constant power dissipation. This is

commonly referred to as power limiting. Current limit inception is deﬁ ned

as the point at which the full-power output voltage falls below the speciﬁ ed

tolerance. See Performance/Functional Speciﬁ cations. If the load current, being

drawn from the converter, is signiﬁ cant enough, the unit will go into a short

circuit condition as described below.

Short Circuit Condition

When a converter is in current-limit mode, the output voltage will drop as the

output current demand increases. If the output voltage drops too low, the mag-

netically coupled voltage used to develop primary side voltages will also drop,

thereby shutting down the PWM controller. Following a time-out period, the

PWM will restart causing the output voltage to begin ramping to their appropri-

ate value. If the short-circuit condition persists, another shutdown cycle will be

initiated. This on/off cycling is referred to as “hiccup” mode. The hiccup cycling

reduces the average output current, thereby preventing internal temperatures

from rising to excessive levels. The ULS Series is capable of enduring an indeﬁ -

nite short circuit output condition.

On/Off Control

The input-side, remote On/Off Control function can be ordered to operate with

either logic type:

Positive ("P" sufﬁ x) logic models are enabled when the on/off pin is left

open (or is pulled high, applying +3.5V to +15V with respect to –Input) as per

Figure 5. Positive-logic devices are disabled when the on/off pin is pulled low

(0 to 1V with respect to –Input).

Negative (“N” sufﬁ x) logic devices are off when pin is left open (or pulled

high, applying +2.5V to +15V), and on when pin is pulled low (–0.1 to +0.8V)

with respect to –Input as shown in Figure 5.

LOAD

+VOUT

–VIN

Sense Current

Contact and PCB resistance

losses due to IR drops

Contact and PCB resistance

losses due to IR drops

Sense Return

+VIN

ON/OFF

CONTROL TRIM

+SENSE

–VOUT

–SENSE

IOUT Return

IOUT

Figure 4. Remote Sense Circuit Conﬁ guration

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ULS 60-Watt Series

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MDC_ULS Series.B27 Page 22 of 24

DOWN

RT (k:) =

Where ∆ _ _

– 10.22

∆

5.11

Trim Down

Trim Equations

Trim Up

RT (k:) = –

1.225 × ∆

5.11 × VNOM x (1 + ∆)

∆

5.11 – 10.22

VOUT – VNOM

VNOM

Note: “∆” is always a positive value.

“VNOM” is the nominal, rated output voltage.

“VOUT” is the desired, changed output voltage.

Where ∆ _ _

VOUT – VNOM

VNOM Figure 6. Trim Connections To Increase Output Voltages

Connect sense to its respective VOUT pin if sense is not used with a remote load.

LOAD

RTRIM UP

+VOUT

–VIN

+VIN

ON/OFF

CONTROL TRIM

+SENSE

–VOUT

–SENSE

LOAD

RTRIM DOWN

+VOUT

–VIN

+VIN

ON/OFF

CONTROL TRIM

+SENSE

–VOUT

–SENSE

Figure 7. Trim Connections To Decrease Output Voltages

OUTPUT VOLTAGE ADJUSTMENT

Dynamic control of the remote on/off function is best accomplished with a

mechanical relay or an open-collector/open-drain drive circuit (optically isolated

if appropriate). The drive circuit should be able to sink appropriate current (see

Performance Speciﬁ cations) when activated and withstand appropriate voltage

when deactivated. Applying an external voltage to pin 2 when no input power is

applied to the converter can cause permanent damage to the converter.

+Vcc

13V CIRCUIT

5V CIRCUIT

–VIN

O N /O F F

C O N TR O L

+VIN

Figure 5. Driving the Negative Logic On/Off Control Pin

(simpliﬁ ed circuit)

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ULS 60-Watt Series

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MDC_ULS Series.B27 Page 23 of 24

Through-hole Soldering Guidelines

Murata Power Solutions recommends the TH soldering speciﬁ cations below when install-

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

these speciﬁ cations may cause damage to the product. 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

SMT Reﬂ ow Soldering Guidelines

The surface-mount reﬂ ow solder proﬁ le shown below is suitable for SAC305 type lead-

free solders. This graph should be used only as a guideline. Many other factors inﬂ uence

the success of SMT reﬂ ow soldering. Since your production environment may differ,

please thoroughly review these guidelines with your process engineers.

Trimming by Using an External Voltage Source

1. The easiest way to trim the output using an external voltage source is to

drive the Trim pin directly from a variable source. The following equation can

be used to calculate the voltage at the Trim pin.

Vo is the output voltage you want; Vonominal is the nominal output voltage;

Vtrim is the voltage that should appear at the trim pin.

2. If the purpose of trimming is to compensate voltage drop of power path

from converter to the Load, you may separately connect the sense pin directly

to the load. It’s much easier than real time adjusting trim voltage.

3. CAUTION: To avoid unplanned power down cycles, do not exceed EITHER

the maximum output voltage OR the maximum output power when setting

the trim. If the output voltage is excessive, the OVP circuit may shut down the

converter. If the maximum power is exceeded, the converter may enter current

limiting. If the power is exceeded for an extended period, the converter may

overheat and encounter overtemperature shut down. Be careful of external

electrical noise. The Trim input is a sensitive input to the converter’s feedback

control loop. Excessive electrical noise may cause instability or oscillation.

Vonominal

Vtrim = 2 x 1.225 x − 1.225

Figure 8. Trimming with an External Source

LOAD

+VOUT

+VIN

–VIN

ON/OFF

CONTROL TRIM

+SENSE

–VOUT

External

source

–SENSE

–

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 without

Murata Power Solutions, Inc.

11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 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/

ULS 60-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

MDC_ULS Series.B27 Page 24 of 24

Figure 9. 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 sol-

dered down to a host carrier board for realistic heat absorp-

tion and spreading. Both longitudinal and transverse 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 mea-

surement conditions can be studied.

The collimator reduces the amount of turbulence adjacent

to the UUT by minimizing airﬂ ow turbulence. Such turbulence

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 different

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.