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For full details go to
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ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C06 Page 1 of 24
FEATURES
nSmall footprint DC/DC converter, ideal for
high current applications
nTiny 0.9" x 1.3" x 0.40" open frame package
nIndustry standard DOSA "brick" format
and pinout with surface mount option
n36-75 Volts DC input range
n2250 Volt Basic input/output isolation
(48V models)
nUp to 66 Watts total output power with
overtemperature shutdown
nHigh efficiency synchronous rectifier forward
topology
nStable no-load operation with no required
external components
nOperating temperature range -40 to +85°C
with derating
nCertified to UL 60950-1, CSA-C22.2 No. 234,
EN60950-1 safety approvals, 2nd Edition
nExtensive 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 fixed 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
specifications 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 indefinitely.
Additional features include output overvoltage and
reverse conduction elimination.
The synchronous rectifier forward topology yields
high efficiency 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. Simplified Block Diagram
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PART NUMBER STRUCTURE
ULS-3.3/20-D48P-C ULS-3.3/20-D48P-Y ULS-5/12-D48PH-Y ULS-12/5-D48P-Y ULS-12/5-D48PH-Y
ULS-3.3/20-D48PH-C ULS-5/12-D48P-Y ULS-5/12-D48PL2-C ULS-12/5-D48P-C ULS-12/5-D48PL2-C
ULS-3.3/20-D48PH-Y ULS-5/12-D48P-C ULS-5/12-D48PM-C ULS-12/5-D48PH-C ULS-12/5-D48PM-C
ULS-3.3/20-D48PM-C ULS-5/12-D48PH-C
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C06 Page 2 of 24
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Root Model
Output Input Efficiency C76
Package
Vout
(V)
Iout
(A, max.)
Power
(W)
R/N (mV pk-pk) Regulation (max.) Vin 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
H
Conformal Coating:
Blank = No coating, standard
H = Coating added, optional special order*
(not available on SMT models)
Please refer to the Part Number Structure when ordering.
These specifications are preliminary. Contact Murata Power Solutions for availability.
All specifications are at nominal line voltage and full load, +25°C unless otherwise noted. See
detailed specifications. 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 specifications describe output voltage deviations from a nominal/midpoint value to either
extreme (50% load step).
C
RoHS Hazardous Substance Compliance
(does not claim EU RoHS exemption 7b–lead in solder)
C = RoHS-6
Y = RoHS-5
-
Lx
Pin Length Option (Thru-hole only)
Blank = Standard pin length 0.180˝ (4.6mm)
L1 = 0.110˝ (2.79mm) ➀
L2 = 0.145˝ (3.68mm) ➀
M
SMT Version
Blank = Through-hole mount, no SMT ➁
M = Surface mount (MSL = 3)
➀Special quantity order is required; samples available with standard pin length only.
➁SMT (M) versions not available in sample quantities.
➂Some model number combinations may not be available. See website or contact your
local Murata sales representative.
Product Label
As shown in figure 2, because of the small size of these products, the product labels
contain a simplified Murata-PS logo and a character-reduced code to indicate the model
number and manufacturing date code. Not all items on the label are always used. Please
note that the label differs from the product photograph.
Label 1
Serial # (4 digits)
Simplified Murata-PS logo
Date code
0001
YYWW
Bar code: Data matrix
Rev
Label 2
MODEL NAME
REG.-Nr. D216
Figure 2. Label Artwork Layout
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ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C06 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 0 20 A
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 Specifications 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 5 15 mA
Reflected (back) ripple current ➁no filtering 150 210 mAp-p
Reflected (back) ripple current ➁Measured at input with specified filter 20 30 mAp-p
GENERAL and SAFETY
Efficiency 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 MΩ
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
fixed, 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” suffix:
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
19
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ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C06 Page 4 of 24
FEATURES and OPTIONS (cont.) Conditions ➀Minimum Typical/Nominal Maximum Units
Remote On/Off Control (cont.)
“P” suffix:
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 0 20 20 A
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 Coefficient At all outputs 0.02 % of Vout./°C
Maximum Capacitive Loading
(10% ceramic, 90% Oscon) Low ESR, .02 ohms max (resistive load) 1000 μF
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 filter is required
Conducted, EN55022/CISPR22 B Class
Radiated, EN55022/CISPR22 B Class
RoHS rating RoHS-6
FUNCTIONAL SPECIFICATIONS, ULS-3.3/20-D48 (CONT.)
15
18
13
11
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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.C06 Page 5 of 24
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, longitudinal airflow)
Efficiency vs. Line Voltage and Load Current @ 25°C
60
65
70
75
80
85
90
95
100
3 4 6 8 10 12 14 16 18 20
VIN = 75V
VIN = 48V
VIN = 36V
Efficiency (%)
Load Current (Amps)
0
5
10
15
20
25
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)
Ripple and Noise (1uF Ceramic and 10uF Tantalum Capcitors)
R/N Waveform (Vin=48V Iout=20A)
Transient Response (Load from 50% to 75%)
Enable Start-up (Vin=48V Iout=0A)
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.C06 Page 6 of 24
TYPICAL PERFORMANCE DATA, ULS-3.3/20-D48 (CONT.)
(Resistive loads50% with +25% step Vin=48V)
Transient Response (Load from 75% to 50%)
Enable Start-up
Enable Start-up (Vin=48V Iout=20A)
Ripple and Noise (1uF Ceramic and 10uF Tantalum Capcitors)
R/N Waveform (Vin=48V Iout=20A)
Transient Response (Load from 50% to 75%)
Enable Start-up (Vin=48V Iout=0A)
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.C06 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 0 12 A
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 Specifications 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 5 10 mA
Reflected (back) ripple current ➁no filtering 400 500 mAp-p
Reflected (back) ripple current ➁Measured at input with specified filter 25 35 mAp-p
GENERAL and SAFETY
Efficiency 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 MΩ
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
fixed, 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” suffix:
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
19
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ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C06 Page 8 of 24
FEATURES and OPTIONS (cont.) Conditions ➀Minimum Typical/Nominal Maximum Units
Remote On/Off Control (cont.)
“P” suffix:
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 0 12 12 A
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 Coefficient At all outputs 0.02 % of Vout./°C
Maximum Capacitive Loading
(10% ceramic, 90% Oscon) Low ESR, .02 ohms max (resistive load) 220 1000 μF
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 filter is required
Conducted, EN55022/CISPR22 A Class
Radiated, EN55022/CISPR22 A Class
RoHS rating RoHS-6
FUNCTIONAL SPECIFICATIONS, ULS-5/12-D48 (CONT.)
15
18
13
11
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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.C06 Page 9 of 24
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin to Vout)
Efficiency and Power Dissipation @ 25°C
50
55
60
65
70
75
80
85
90
95
100
3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0
2
3
4
5
6
7
8
9
10
11
12
VIN = 75V
VIN = 48V
VIN = 36V
Power Dissipation
(Vin = 48V)
Efficiency (%)
Load Current (Amps)
Power Dissipation (Watts)
7
8
9
10
11
12
13
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)
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 flowing at 400LFM. Air
if flowing across the converter from +V to -V at 48V input. Identifiable and recommended
value to be verified 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.C06 Page 10 of 24
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ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C06 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 0 5 A
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 Specifications 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 (TH) 15 25 mA
Shut-Down Mode Input Current (SMT) 15 20 mA
Reflected (back) ripple current ➁no filtering 150 200 mAp-p
Reflected (back) ripple current ➁Measured at input with specified filter 15 30 mAp-p
GENERAL and SAFETY
Efficiency Vin=48V, full load 88 91 %
Vin=Min (TH) 89 90 %
Vin=Min (SMT) 89 91.5 %
Isolation
Isolation Voltage, input to output 2250 Vdc
Insulation Safety Rating basic
Isolation Resistance 100 MΩ
Isolation Capacitance (TH) 1000 pF
Isolation Capacitance (SMT) 1500 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
fixed, 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 (TH) Remote ON to Vout regulated 30 mS
Startup Time (SMT) Remote ON to Vout regulated 20 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
19
*NOTE: The ULS-12/5-D48NM-C (SMT version) contains ceramic capacitors. No tantalum capacitors are used.
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ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C06 Page 12 of 24
FEATURES and OPTIONS Conditions ➀Minimum Typical/Nominal Maximum Units
Remote On/Off Control
“N” suffix:
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
“P” suffix:
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 (TH) ➇User-adjustable -10 10
Output Voltage Range (SMT) ➇User-adjustable -15 10
Overvoltage Protection Via magnetic feedback 13.3 14.5 18 Vdc
Remote Sense Compensation Of Vset 10 %
Current
Output Current Range 0 5 5 A
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 Coefficient At all outputs 0.02 % of Vout./°C
Maximum Capacitive Loading
(10% ceramic, 90% Oscon) Low ESR, .02 ohms max (resistive load) 1000 μF
Maximum Capacitive Loading loads: CC mode μF
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 filter is required
Conducted, EN55022/CISPR22 B Class
Radiated, EN55022/CISPR22 B Class
RoHS rating RoHS-6
FUNCTIONAL SPECIFICATIONS, ULS-12/5-D48 (CONT.)
15 18
13
11
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ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C06 Page 13 of 24
Performance Specification Notes
➀All specifications 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 airflow. See
Derating Curves for temperature performance. All models are stable and
regulate within spec without external cacacitance.
➁Input Ripple Current is tested and specified over a 5-20 MHz bandwidth
and uses a special set of external filters only for the Ripple Current speci-
fications. Input filtering 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.
➂Note that Maximum Current Derating Curves indicate an average current
at nominal input voltage. At higher temperatures and/or lower airflow, 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.
➃Mean Time Before Failure (MTBF) is calculated using the Telcordia
(Belcore) SR-332 Method 1, Case 3, Issue 1, ground fixed conditions. Oper-
ating temperature = +30°C, full output load, natural air convection.
➄The output may be shorted to ground indefinitely with no damage. The
Output Short Circuit Current shown in the specifications is an average con-
sisting of very short bursts of full rated current to test whether the output
circuit can be repowered.
➅The 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 specifications.
➆Regulation specifications describe the deviation as the input line voltage
or output load current is varied from a nominal midpoint value to either
extreme (50% load).
➇Do not exceed maximum power ratings, Sense limits or output overvoltage
when adjusting output trim values.
➈At zero output current, Vout may contain components which slightly
exceed the ripple and noise specifications.
➉Output overload protection is non-latching. When the output overload
is removed, the output will automatically recover.
All models are fully operational and meet published specifications,
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 filter. See
the Application Notes. Use only as much output filtering 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 specifications 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 fixed switching frequencies.
11
12
13
14
15
16
17
18
19
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TYPICAL PERFORMANCE DATA, ULS-12/5-D48
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C06 Page 14 of 24
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin to Vout)
Efficiency and Power Dissipation vs. Line Voltage and Load Current @ 25°C
50
55
60
65
70
75
80
85
90
95
100
2
3
4
5
6
7
8
9
10
11
12
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
0
1
2
3
4
5
6
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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Sixteenth-brick DOSA-Compatible,
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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)
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 flowing at 400LFM. Air
if flowing across the converter from -V to +V at 48V input. Identifiable and recommended
value to be verified 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.C06 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]
33
1.30
11.7
.46
14.0
.55
3.81
.150
3.81
.150
RECOMMENDED FOOTPRINT
(VIEW THROUGH CONVERTER)
1
2
34
8
C
LFINISHED HOLE SIZES
@ PINS 4 & 8
(PER IPC-D-275, LEVEL C)
.070-.084
(SEC)
C
L
(PRI)
C
L
TOP VIEW
FINISHED HOLE SIZES
@ PINS 1-3, 6, 5, 7
(PER IPC-D-275, LEVEL C)
.048-.062
5
7
6
0.300 (7.62)
0.600 (15.24)
0.600 (15.24)
0.90 (22.9)
1.30 (33.0)
BOTTOM PIN VIEW
3
26
5
1
7
8
4
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:
φ0.040±0.001(1.016±0.025)
PINS 4,8:
φ0.062±0.001(1.575±0.025)
0.100 ±0.005 2X
0.078 ±0.005 6X
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ULS 60-Watt Series
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MDC_ULS Series.C06 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
Label
128 units
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 = 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
3
26
5
1
7
8
4
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)
0.150 (3.8)0.020 (0.5) Min
0.062
(1.575)
1.30 (33.0)
.90
22.9
33
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)
1
2
34
8
C
L
(SEC)
C
L
(PRI)
C
L
TOP VIEW
5
7
6
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.C06 Page 18 of 24
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ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C06 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
Sixteenth-brick DOSA-Compatible,
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MDC_ULS Series.C06 Page 20 of 24
TECHNICAL NOTES
highly inductive source impedances. The input circuit shown in Figure 3 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.
I/O Filtering, Input Ripple Current, and Output Noise
All models in the ULS Series are tested/specified for input reflected ripple
current and output noise using the specified external input/output components/
circuits and layout as shown in the following two figures. External input capaci-
tors (CIN in Figure 3) 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 3, CBUS and LBUS simulate a typical dc voltage bus. Your specific
system configuration may necessitate additional considerations.
In critical applications, output ripple/noise (also referred to as periodic and
random deviations or PARD) may be reduced below specified limits using filter-
ing techniques, the simplest of which is the installation of additional external
output capacitors. They function as true filter 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 efficiency.
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.
Pre-Bias Protection
For applications where a pre-bias potential can be present at the output of the
power module it is recommended that either blocking diodes are added in series
with the Vout power lines or, a preferred solution is to use an OR-ing FET control-
ler like the LM5050-1 High-Side & LM5051 Low-Side OR-ing FET Controller from
TI. Starting the module into a pre-bias condition can cause permanent damage
to the module.
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 specified accuracy band. Actual
measured times will vary with input source impedance, external input capaci-
tance, and the slew rate and final 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
specification defines the interval between the point at which the converter is
turned on (released) and the fully loaded output voltage enters and remains
within its specified 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 insignificant.
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
C
IN
V
IN
C
BUS
L
BUS
C
IN
= 33µF, ESR < 700mΩ @ 100kHz
C
BUS
= 220µF, ESR < 100mΩ @ 100kHz
L
BUS
= 12µH
+VIN
–VIN
CURRENT
PROBE
TO
OSCILLOSCOPE
+
–
Figure 3. Measuring Input Ripple Current
C1
C1 = 1µF
C2 = 10µF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
C2 R
LOAD
SCOPE
+VOUT
–VOUT
+SENSE
–SENSE
Figure 4. 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(–)] ≤ 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-
fications 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 specified rating, or cause output voltages to climb into
the output over-voltage region. Therefore, the designer must ensure:
(VOUT at pins) x (IOUT) ≤ rated output power
Floating Outputs
Since these are isolated DC/DC converters, their outputs are “floating” 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-rectifier 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
Specifications.
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 defined
as the point at which the full-power output voltage falls below the specified
tolerance. See Performance/Functional Specifications. If the load current, being
drawn from the converter, is significant 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" suffix) 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 6. Positive-logic devices are disabled when the on/off pin is pulled low
(0 to 1V with respect to –Input).
Negative (“N” suffix) 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 6.
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 5. Remote Sense Circuit Configuration
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ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
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MDC_ULS Series.C06 Page 22 of 24
DOWN
RT (kΩ) =
Where ∆% =
|(
× 100
)|
– 10.22
∆%
511
Trim Down
Trim Equations
Trim Up
UP
RT (kΩ) = –
1.225 × ∆%
5.11 × VNOM × (100 + ∆%)
∆%
511 – 10.22
VNOM – VDES
VNOM
Note: “∆%” is always a positive value.
“VNOM” is the nominal, rated output voltage.
“VDES” is the desired, changed output voltage.
Figure 7. 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 8. 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 Specifications) 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 6. Driving the Negative Logic On/Off Control Pin
(simplified circuit)
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ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C06 Page 23 of 24
Through-hole Soldering Guidelines
Murata Power Solutions recommends the TH soldering specifications below when install-
ing these converters. These specifications vary depending on the solder type. Exceeding
these specifications 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 Reflow Soldering Guidelines
The surface-mount reflow solder profile shown below is suitable for SAC305 type lead-
free solders. This graph should be used only as a guideline. Many other factors influence
the success of SMT reflow 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
Vo
Vtrim = 2 x 1.225 x − 1.225
Figure 9. 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. Specifications are subject to change
without notice. © 2018 Murata Power Solutions, Inc.
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/
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C06 Page 24 of 24
Figure 10. Vertical Wind Tunnel
Vertical Wind Tunnel
Murata Power Solutions employs a computer controlled cus-
tom-designed closed loop vertical wind tunnel, infrared video
camera system, and test instrumentation for accurate airflow
and heat dissipation analysis of power products. The system
includes a precision low flow-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 airflow
studies are possible by rotation of this carrier board since
there are often significant differences in the heat dissipation
in the two airflow directions. The combination of adjustable
airflow, 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 airflow turbulence. Such turbulence
influences 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 condi-
tions.
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Authorized Distributor
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