ULS-5/6-D48P-C [MURATA]
DC-DC Regulated Power Supply Module, 1 Output, 30W, Hybrid, ROHS COMPLIANT, SIXTEENTH BRICK PACKAGE-6;
| 型号： | ULS-5/6-D48P-C |
| 厂家： | 
muRata |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, 30W, Hybrid, ROHS COMPLIANT, SIXTEENTH BRICK PACKAGE-6 |
| 文件： | 总30页 (文件大小：2552K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ULS 30-Watt Series
s
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FEATURES
nꢀSmall footprint DC/DC converter, ideal for
embedded applications
nꢀ1.30" x 0.90" x 0.36" open frame package
nꢀIndustry standard DOSA "brick" format
and pinout with surface mount option
nꢀ2:1 Input Voltage Range (36V-75V, D48)
PRODUCT OVERVIEW
The world of “brick” DC/DC converters has seen
a steady size reduction. The ULS series makes an- FPGA’s. No minimum load is required. For systems
other dramatic size shrink down to a “sixteenth-
brick” width (0.91 inches) while still retaining up
to 30 Watt output and full 2250 Volt DC isolation.
The PC-board mount converter family accepts
nꢀ2250 Volt Basic input/output isolation
(48V models)
using CPU’s, ASIC’s, programmable logic and
nꢀUp to 30 Watts total output power with
overtemperature shutdown
requiring controlled startup/shutdown, an external
remote On/Off control may use a switch, transistor
or digital logic.
nꢀHigh efficiency synchronous rectifier forward
topology
Many self-protection features on the ULS series
36 to 75 Volts DC inputs and delivers fixed outputs avoid both converter and external circuit hazards.
nꢀStable no-load operation with no required
external components
regulated to within 0.125ꢀ. 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 -20ꢀ to
+10ꢀ of nominal output while delivering fast set-
tling to current step loads and no adverse effects
from higher capacitive loads. Excellent ripple and
noise specifications assure compatibility to circuits
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.
nꢀOperating temperature range -40 to +85°C
with derating
nꢀCertified to UL/EN/IEC 60950-1, CAN/CSA
C22.2 No. 60950-1, EN60950-1 safety
approvals, 2nd Edition
nꢀExtensive self-protection shut down features
Isolation
F1
+Vin (1)
+Vout (8)
Barrier
• Switching
• Filters
+Sense (7)*
External
DC
Power
Source
On/Off
Control
(2)
Controller
and Power
Transfer
• Current Sense
-Sense (5)*
Open = On
Closed = Off
(Positive
logic)
Reference and
Error Amplifier
Trim (6)
-Vin (3)
-Vout (4)
*Sense is included on the ULS-3.3/8-D48 and ULS-5/6-D48 only.
Figure 1. Simplified Block Diagram
Typical topology is shown
For full details go to
www.murata-ps.com/rohs
REG.-Nr. D216
www.murata-ps.com/support
MDC_ULS-30W_C08 Page 1 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
Input
Vin Nom. Range Iin, no load
Efficiency
Root Model
R/N (mV pk-pk)
Case (inches)
Regulation (max.) ➂
Vout
(V)
Iout
(A, max.)
Power
(W)
Iin, full
load (A)
(V)
(V)
(mA)
Typ.
90
Max.
130
100
150
125
Line
Load
Min. Typ.
89ꢀ 90ꢀ
89ꢀ 91ꢀ
86ꢀ 87.7ꢀ
87.5ꢀ 89ꢀ
ULS-3.3/8-D48
ULS-5/6-D48
3.3
5
8
6
26.5
30
0.1ꢀ
0.1ꢀ
48
48
48
48
36-75
36-75
36-75
36-75
75
20
25
25
0.58
0.69
0.71
0.70
1.30x0.90x0.36
1.30x0.90x0.36
1.30x0.90x0.36
1.30x0.90x0.36
75
0.125ꢀ
0.125ꢀ
0.125ꢀ
0.1ꢀ
ULS-12/2.5-D48
ULS-15/2-D48
12
15
2.5
2
30
130
115
0.125ꢀ
0.125ꢀ
30
Please refer to the Part Number Structure when ordering.
Regulation specifications describe output voltage deviations from a nominal/midpoint value to either
extreme (50% load step).
All specifications are typical 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.
PART NUMBER STRUCTURE
ULS - 12 / 2.5 - D48 N M Lx - C
RoHS Hazardous Substance Compliance
(does not claim EU RoHS exemption 7b–lead in solder)
C = RoHS-6
Sixteenth Brick Series
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
Nominal Output Voltage:
SMT Version
Blank = Through-hole mount, no SMT
Maximum Rated Output Current
Current in Amps
M = Surface mount (MSL Rating 2) ➁
On/Off Control Logic:
N = Negative
P = Positive
Input Voltage Range:
D48 = 36-75 Volts (48V nominal)
➀ꢀ Special quantity order is required; samples available with standard pin length only.
➁ꢀ SMT (M) versions not available in sample quantities.
➂ꢀ Some model number combinations may not be available. See website or contact your local Murata sales representative.
www.murata-ps.com/support
MDC_ULS-30W_C08 Page 2 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-3.3/8-D48
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Minimum
Typical/Nominal
Maximum
80
100
Units
Vdc
Vdc
Vdc
Vdc
Vdc
W
Conditions ➀
0
100 mS max. duration
Isolation Voltage
Input to output, continuous
None, install external fuse
Power on, referred to -Vin
2250
Input Reverse Polarity
On/Off Remote Control
Output Power
None
0
0
15
26.66
Current-limited, no damage, short-circuit
protected
Output Current
0
8
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
Conditions ➀ꢀ➂
Operating voltage range
Recommended External Fuse
Start-up threshold
Undervoltage shutdown
Turn-On/Turn-Off Hysteresis
Overvoltage shutdown
Reverse Polarity Protection
Internal Filter Type
36
48
75
1.5
36
Vdc
A
Fast blow
Rising input voltage
Falling input voltage
34
32
35.2
34
1.5
None
None
LC
Vdc
Vdc
Vdc
Vdc
Vdc
35.2
None, install external fuse
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load
Shut-Down Input Current (Off, UV, OT)
Reflected (back) ripple current ➁
GENERAL and SAFETY
Efficiency
Vin = nominal
Vin = minimum
0.58
0.77
0.05
50
75
1
0.63
0.83
A
A
A2-Sec.
mA
100
100
2
Iout = minimum, unit = ON
mA
mA
mA, p-p
Measured at input with specified filter
30
Vin = 48V, full load
Vin = min., full load
89
89.5
90
90.5
ꢀ
ꢀ
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Input to output, continuous
2250
10
Vdc
basic
MΩ
pF
1000
Yes
Certified to UL-60950-1, CSA-C22.2 No. 60950-1,
IEC/EN60950-1, 2nd edition
Safety
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient = +25°C
Calculated MTBF
2
Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
320
350
380
50
50
KHz
mS
mS
Power on to Vout regulated
Remote ON to Vout regulated
50-75-50ꢀ load step, settling time to within
2ꢀ of Vout
Startup Time
Dynamic Load Response
100
30
150
100
µSec
mV
Dynamic Load Peak Deviation
FEATURES and OPTIONS
Remote On/Off Control ➄
“N” suffix:
same as above
Negative Logic, ON state
Negative Logic, OFF state
Control Current
ON = Ground pin or external voltage
OFF = Pin open or external voltage
Open collector/drain
-0.7
10
1.2
15
V
V
mA
1
1
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
ON = Pin open or external voltage
OFF = Ground pin or external voltage
Open collector/drain
10
-0.7
15
1.2
V
V
mA
SMT Mounting
"M" suffix
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MDC_ULS-30W_C08 Page 3 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-3.3/8-D48 (CONT.)
OUTPUT
Total Output Power
Conditions ➀
See Derating
Minimum
2.61
Typical/Nominal
Maximum
26.66
Units
W
25
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
Output Current Range
Minimum Load
Current Limit Inception
Short Circuit
No trim
At 50ꢀ load, no trim
User-adjustable
3.2674
-1
-10
3.3
3.333
1
10
Vdc
ꢀ of Vnom
ꢀ of Vnom.
Vdc
Via magnetic feedback
4.2
5
8
5.7
0.8
8.5
8
A
A
98ꢀ of Vnom., after warmup
10
11.3
Hiccup technique, autorecovery within 1.25ꢀ
of Vout
Short Circuit Current
0.3
mA
Short Circuit Duration (remove short for
recovery)
Short circuit protection method
Output shorted to ground, no damage
Current limiting
Continuous
Regulation ➅
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
MECHANICAL (Through Hole Models)
Outline Dimensions
(Please refer to outline drawing)
Weight
Vin = min. to max., Vout = nom., Iout = nom.
Iout = min. to max., Vin = 48V
5 Hz- 20 MHz BW
0.1
0.1
130
ꢀ of Vout
ꢀ of Vout
mV pk-pk
ꢀ of Vout./°C
μF
90
0.02
At all outputs
Low ESR, resistive load only
2000
Conditions ➀ꢀ➂
1.30x0.90x0.36
33.02x22.86x9.144
0.58
Inches
mm
Ounces
Grams
Inches
mm
LxWxH
16.4
Through Hole Pin Diameter
0.04 & 0.062
1.016 & 1.575
Copper alloy
50
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Nickel subplate
Gold overplate
µ-inches
µ-inches
5
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
Relative humidity, non-condensing
Altitude
With Derating
No derating, full power, 200lfm, Vertical mount
Vin = Zero (no power)
-40
-40
-55
110
85
70
125
120
°C
°C
°C
°C
Measured in center
External filter is required
115
B
B
Class
Class
ꢀRH
feet
meters
To +85°C
must derate -1ꢀ/1000 feet
10
-500
-152
90
10,000
3048
RoHS-6
RoHS rating ➃
Performance Specification Notes
➀ Unless otherwise noted, all specifications are typical at nominal input voltage, nominal output voltage
and full load. General conditions are +25° Celsius ambient temperature, near sea level altitude,
natural convection airflow. All models are tested and specified with external parallel 1 μF and 10 μF
multi-layer ceramic output capacitors. The external input capacitor is 22 μF ceramic. All capacitors
are low-ESR types wired close to the converter. These capacitors are necessary for our test equip-
ment and may not be needed in the user's application.
➂ꢀAll models are stable and regulate to specification under no load.
➃ Reduction of Hazardous Substances (RoHS) compliance is to RoHS-6 (six substances restricted
including lead). See specifications.
➄ The Remote On/Off Control is referred to -Vin.
➅ Regulation specifications describe the output voltage changes as the line voltage or load current is
varied from its nominal or midpoint value to either extreme.
➁ꢀInput (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering is
Cbus = 220 μF/100V, Cin = 33 μF/100V and Lbus = 12 μH.
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MDC_ULS-30W_C08 Page 4 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TYPICAL PERFORMANCE CURVES, ULS-3.3/8-D48
Efficiency vs. Line Voltage and Load Current @ 25°C
Maximum Current Temperature Derating at Sea Level
(Vin = 36-75V, airflow is from pin 1 to pin 3)
ꢊꢅ
ꢊꢀ
ꢂꢂ
ꢂꢄ
ꢂꢆ
ꢂꢅ
ꢂꢀ
ꢉꢂ
ꢈ
ꢇ
ꢆ
ꢅ
ꢄ
ꢃ
ꢂ
ꢁ
ꢀ
ꢀꢉꢃꢃ to ꢂꢉꢀ m/s ꢊꢆꢅ to ꢄꢀꢀ ꢋꢌꢍꢎ
ꢉꢄ
ꢋIꢌ ꢍ ꢉꢈꢋ
ꢉꢆ
ꢉꢅ
ꢉꢀ
ꢄꢂ
ꢄꢄ
ꢄꢆ
ꢋIꢌ ꢍ ꢄꢀꢋ
ꢋIꢌ ꢍ ꢆꢂꢋ
ꢋIꢌ ꢍ ꢇꢄꢋ
ꢃꢀ
ꢃꢅ
ꢄꢀ
ꢄꢅ
ꢅꢀ
ꢅꢅ
ꢆꢀ
ꢆꢅ
ꢇꢀ
ꢇꢅ
ꢈꢀ
ꢈꢅ
ꢆꢇꢉieꢄt ꢊeꢇꢂeratꢁre ꢅꢋꢃꢈ
ꢀꢁꢀꢀ
ꢀꢁꢂꢃ
ꢃꢁꢄꢃ
ꢅꢁꢆꢃ
ꢇꢁꢅꢃ
ꢆꢁꢀꢃ
ꢆꢁꢂꢃ
ꢈꢁꢄꢃ
ꢄꢁꢆꢃ
ꢉꢁꢅꢃ
ꢂꢁꢀꢃ
Load Current (Amps)
INFRARED THERMAL IMAGE, ULS-3.3/8-D48
Thermal image with hot spot at full load current with 25°C ambient temperature. Natural convention is used with no forced airflow. Identifiable and recommended maximum value
to be verified in application. Vin=48V, Q7 max temp=120°C/IPC9592 guidelines.
(+Vin)
(+Vout)
(-Vin)
(-Vout)
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MDC_ULS-30W_C08 Page 5 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
OSCILLOGRAMS, ULS-3.3/8-D48
On/Off Enable Delay (Vin=36V, vout=nom, Iout=8A, Cload =1uF || 10uF, Ta=+25°C,
ScopeBW=20Mhz) Trace 1= Enable, Trace 3= Vout.
On/Off Enable Delay (Vin=75V, vout=nom, Iout=8A, Cload =1uF || 10uF, Ta=+25°C,
ScopeBW=20Mhz) Trace 1= Enable, Trace 3= Vout.
Startup Delay (Vin=48V, Vout=nom, Iout=8A, Cload= 1uF || 10 uF, Ta=+25°C,
ScopeBW=20Mhz) Trace 1= Vin, Trace3, Vout.
Startup Delay (Vin=48V, Vout=nom, Iout=8A, Cload= 1uF || 10 uF & 2000uF, Ta=+25°C,
ScopeBW=20Mhz) Trace 1= Vin, Trace3, Vout.
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MDC_ULS-30W_C08 Page 6 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
OSCILLOGRAMS, ULS-3.3/8-D48
Step Load Transient Response (Vin=48V, Vout=nom, Iout=50-100-50ꢀ of full load,
Cload= 1uF || 10uF, Ta=+25°C, ScopeBW=20Mhz)
Step Load Transient Response (Vin=48V, Vout=nom, Iout=50-75-50ꢀ of full load,
Cload= 1uF || 10uF, Ta=+25°C, ScopeBW=20Mhz)
Output Ripple and Noise (Vin=48V, Vout=nom, Iout=8A, Cload= 1uF || 10uF, Ta=+25°C,
ScopeBW=20Mhz)
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MDC_ULS-30W_C08 Page 7 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-5/6-D48
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
Minimum
Typical/Nominal
Maximum
80
100
Units
Vdc
Vdc
Vdc
Vdc
Vdc
W
Conditions ➀
0
100 mS max. duration
Input to output, continuous
None, install external fuse
Power on, referred to -Vin
2250
None
0
0
15
30.3
Current-limited, no damage, short-circuit
protected
Output Current
0
6
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
Conditions ➀ꢀ➂
Operating voltage range
Recommended External Fuse
Start-up threshold
Undervoltage shutdown
Turn-On/Turn-Off Hysteresis
Overvoltage shutdown
Reverse Polarity Protection
Internal Filter Type
36
48
75
2
35.9
34
Vdc
A
Fast blow
Rising input voltage
Falling input voltage
32.5
31
1.62
35
Vdc
Vdc
Vdc
Vdc
Vdc
33.5
1.67
None
None
LC
1.72
None, install external fuse
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load
Shut-Down Input Current (Off, UV, OT)
Reflected (back) ripple current ➁
GENERAL and SAFETY
Efficiency
Vin = nominal
Vin = minimum
0.69
0.92
0.05
10
20
1
0.71
0.95
A
A
A2-Sec.
mA
100
60
3
Iout = minimum, unit = ON
mA
mA
mA, p-p
Measured at input with specified filter
30
Vin = 48V, full load
Vin = min., full load
89
89
91
91
ꢀ
ꢀ
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Input to output, continuous
2250
Vdc
basic
10
3300
MΩ
pF
Certified to UL-60950-1, CSA-C22.2 No. 60950-1,
IEC/EN60950-1, 2nd edition
Safety
Yes
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient = +25°C
Calculated MTBF
TBD
Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
325
355
10
10
385
40
40
KHz
mS
mS
Power on to Vout regulated
Remote ON to Vout regulated
50-75-50ꢀ load step, settling time to within
1ꢀ of Vout
Startup Time
Dynamic Load Response
75
100
µSec
mV
Dynamic Load Peak Deviation
FEATURES and OPTIONS
Remote On/Off Control ➄
“N” suffix:
same as above
150
Negative Logic, ON state
Negative Logic, OFF state
Control Current
ON = Ground pin or external voltage
OFF = Pin open or external voltage
Open collector/drain
-0.1
2.5
0.8
15
V
V
mA
1
1
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
ON = Pin open or external voltage
OFF = Ground pin or external voltage
Open collector/drain
10
0
15
0.7
V
V
mA
SMT Mounting
“M” suffix
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MDC_ULS-30W_C08 Page 8 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-5/6-D48 (CONT.)
OUTPUT
Total Output Power
Conditions ➀
Minimum
Typical/Nominal
Maximum
30.3
Units
W
0
30
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
Output Current Range
Minimum Load
Current Limit Inception
Short Circuit
No trim
At 50ꢀ load, no trim
User-adjustable
4.95
-1
-10
6
5
5.05
1
10
Vdc
ꢀ of Vnom
ꢀ of Vnom.
Vdc
Via magnetic feedback
6.5
6
7.2
0
6
A
A
98ꢀ of Vnom., after warmup
6.5
7.5
8.25
Hiccup technique, autorecovery within 1.25ꢀ
of Vout
Short Circuit Current
0.3
A
Short Circuit Duration (remove short for
recovery)
Short circuit protection method
Output shorted to ground, no damage
Current limiting
Continuous
Regulation ➅
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
MECHANICAL (Through Hole Models)
Outline Dimensions
(Please refer to outline drawing)
Weight
Vin = min. to max., Vout = nom., Iout = nom.
Iout = min. to max., Vin = 48V
5 Hz- 20 MHz BW
0.125
0.1
100
ꢀ of Vout
ꢀ of Vout
mV pk-pk
ꢀ of Vout./°C
μF
75
0.02
At all outputs
Low ESR, resistive load only
2000
Conditions ➀ꢀ➂
1.30x0.90x0.36
33.02x22.86x9.144
0.58
Inches
mm
Ounces
Grams
Inches
mm
LxWxH
16.4
Through Hole Pin Diameter
0.04 & 0.062
1.016 & 1.575
Copper alloy
50
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Nickel subplate
Gold overplate
µ-inches
µ-inches
5
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
RoHS rating ➃
With Derating
No derating, full power, 200lfm, Vertical mount
Vin = Zero (no power)
-40
-40
-55
110
85
70
125
120
°C
°C
°C
°C
Measured in center
External filter is required
115
B
B
Class
Class
RoHS-6
Performance Specification Notes
➀ Unless otherwise noted, all specifications are typical at nominal input voltage, nominal output voltage
and full load. General conditions are +25° Celsius ambient temperature, near sea level altitude,
natural convection airflow. All models are tested and specified with external parallel 1 μF and 10 μF
multi-layer ceramic output capacitors. The external input capacitor is 22 μF ceramic. All capacitors
are low-ESR types wired close to the converter. These capacitors are necessary for our test equip-
ment and may not be needed in the user's application.
➂ꢀAll models are stable and regulate to specification under no load.
➃ Reduction of Hazardous Substances (RoHS) compliance is to RoHS-6 (six substances restricted
including lead). See specifications.
➄ The Remote On/Off Control is referred to -Vin.
➅ Regulation specifications describe the output voltage changes as the line voltage or load current is
varied from its nominal or midpoint value to either extreme.
➁ꢀInput (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering is
Cbus = 220 μF/100V, Cin = 33 μF/100V and Lbus = 12 μH.
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MDC_ULS-30W_C08 Page 9 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TYPICAL PERFORMANCE CURVES, ULS-5/6-D48
Efficiency vs. Line Voltage and Load Current @ 25°C
Maximum Current Temperature Derating at Sea Level
(Vin = 36-75V, airflow is from pin 3 to pin 1)
ꢊꢀ
ꢊꢂ
ꢉꢊ
ꢉꢉ
ꢉꢈ
ꢉꢇ
ꢉꢃ
ꢉꢆ
ꢉꢅ
ꢉꢄ
ꢉꢀ
ꢉꢂ
ꢈꢊ
ꢈꢉ
ꢈꢈ
ꢈꢇ
ꢇ
ꢆ
ꢅ
ꢄ
ꢃ
ꢂ
ꢁ
ꢀ
ꢀꢉꢃꢃ to ꢂꢉꢀ m/s ꢊꢆꢅ to ꢄꢀꢀ ꢋꢌꢍꢎ
ꢋIꢌ ꢍ ꢈꢃꢋ
ꢋIꢌ ꢍ ꢇꢂꢋ
ꢋIꢌ ꢍ ꢆꢉꢋ
ꢋIꢌ ꢍ ꢅꢇꢋ
ꢃꢀ
ꢃꢅ
ꢄꢀ
ꢄꢅ
ꢅꢀ
ꢅꢅ
ꢆꢀ
ꢆꢅ
ꢇꢀ
ꢇꢅ
ꢈꢀ
ꢈꢅ
ꢀꢁꢂ
ꢀꢁꢃ
ꢄꢁꢂ
ꢄꢁꢃ
ꢅꢁꢂ
ꢅꢁꢃ
ꢆꢁꢂ
ꢆꢁꢃ
ꢃꢁꢂ
ꢃꢁꢃ
ꢇꢁꢂ
ꢆꢇꢉieꢄt ꢊeꢇꢂeratꢁre ꢅꢋꢃꢈ
Load Current (Amps)
Power Dissipation vs. Load Current @ 25°C
Current Limit
ꢂꢁꢂ
ꢂ
ꢅꢁꢂ
ꢆꢁꢂ
ꢆ
ꢅꢁꢀ
ꢄꢁꢂ
ꢄꢁꢀ
ꢃꢁꢂ
ꢃꢁꢀ
ꢀꢁꢂ
ꢅꢁꢂ
ꢅ
ꢊIꢋ ꢌ ꢇꢂꢊ
ꢄꢁꢂ
ꢄ
ꢈIꢉ ꢊ ꢋꢂꢈ
ꢈIꢉ ꢊ ꢇꢀꢈ
ꢈIꢉ ꢊ ꢆꢌꢈ
ꢈIꢉ ꢊ ꢅꢇꢈ
ꢊIꢋ ꢌ ꢈꢀꢊ
ꢊIꢋ ꢌ ꢅꢈꢊ
ꢃꢁꢂ
ꢃ
ꢊIꢋ ꢌ ꢆꢉꢊ
ꢀꢁꢂ
ꢀ
ꢃꢁꢀ
ꢃꢁꢂ
ꢄꢁꢀ
ꢄꢁꢂ
ꢅꢁꢀ
ꢅꢁꢂ
ꢆꢁꢀ
ꢆꢁꢂ
ꢂꢁꢀ
ꢂꢁꢂ
ꢇꢁꢀ
ꢇꢁꢀ
ꢇꢁꢄ
ꢇꢁꢆ
ꢇꢁꢈ
ꢇꢁꢉ
ꢉꢁꢀ
ꢉꢁꢄ
Lꢀaꢃ ꢄꢅrreꢆt ꢁꢇꢈꢉsꢂ
ꢀꢁtꢂꢁt Lꢃaꢄ ꢅꢁrreꢆt ꢇꢈꢉꢂsꢊ
INFRARED THERMAL IMAGE, ULS-5/6-D48
Thermal image with hot spot at full current with 25°C ambient temperature. Natural convention is used with no forced airflow. Identifiable and recommended maximum value to
be verified in application. Vin=48V, Q7 max temp=120°C/IPC9592 guidelines.
91.5°C
90
(+Vin)
(+Vout)
Q6: 81.3
T1: 78.1
Q7: 82.9
R4: 80.1
80
70
60
50
R20: 82.3
(-Vin)
(-Vout)
47.9°C
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MDC_ULS-30W_C08 Page 10 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
OSCILLOGRAMS, ULS-5/6-D48
Startup Delay (Vin=48V, Iout=6A, Cload=0, Ta=+25°C) Trace1=Vin, Trace4=Vout.
Startup Delay (Vin=48V, Iout=6A, Cload=2200uF, Ta=+25°C) Trace1=Vin, Trace4=Vout
On/Off Enable Delay (Vin=48V, Iout=6A, Cload=0, Ta=+25°C)
Trace1=Enable, Trace4=Vout
On/Off Enable Delay (Vin=48V, Iout=6A, Cload=2000uF, Ta=+25°C)
Trace1=Enable, Trace4=Vout
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MDC_ULS-30W_C08 Page 11 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
OSCILLOGRAMS, ULS-5/6-D48
Output Ripple and Noise (Vin=48V, Iout=0A, Cload= 1uF || 10uf, Ta=+25°C)
Output Ripple and Noise (Vin=48V, Iout=6A, Cload= 1uF || 10uf, Ta=+25°C)
Step Load Transient Response (Vin=48V, Iout=50-75-50ꢀ of Imax,
Cload= 1uf || 10uF, Ta=+25°C)
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MDC_ULS-30W_C08 Page 12 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-12/2.5-D48
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
Minimum
Typical/Nominal
Maximum
80
100
Units
Vdc
Vdc
Vdc
Vdc
Vdc
W
Conditions ➀
0
100 mS max. duration
Input to output, continuous
None, install external fuse
Power on, referred to -Vin
2250
None
0
0
15
30
Current-limited, no damage, short-circuit
protected
Output Current
0
2.5
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
Conditions ➀ꢀ➂
Operating voltage range
Recommended External Fuse
Start-up threshold
Undervoltage shutdown
Turn-On/Turn-Off Hysteresis
Overvoltage shutdown
Reverse Polarity Protection
Internal Filter Type
36
48
75
2
35.5
33
Vdc
A
Fast blow
Rising input voltage
Falling input voltage
32.5
31
1.40
33.5
32
1.46
None
None
Vdc
Vdc
Vdc
Vdc
Vdc
1.52
None, install external fuse
Capacitive
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load
Vin = nominal
Vin = minimum
0.71
0.95
0.05
100
25
0.73
0.97
A
A
A2-Sec.
mA
200
50
Iout = minimum, unit = ON
mA
Shut-Down Input Current (Off, UV, OT)
Reflected (back) ripple current ➁
GENERAL and SAFETY
Efficiency
5
15
10
30
mA
mA, p-p
Measured at input with specified filter
Vin = 48V, full load
Vin = min., full load
86.0
85.5
87.7
87.5
ꢀ
ꢀ
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Input to output, continuous
2250
Vdc
basic
100
1600
MΩ
pF
Certified to UL-60950-1, CSA-C22.2 No. 60950-1,
IEC/EN60950-1, 2nd edition
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient = +25°C
Safety
Yes
3
Calculated MTBF
Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
260
285
310
30
30
KHz
mS
mS
Power on to Vout regulated
Remote ON to Vout regulated
50-75-50ꢀ load step, settling time to within
1ꢀ of Vout
Startup Time
Dynamic Load Response
200
250
300
300
µSec
mV
Dynamic Load Peak Deviation
FEATURES and OPTIONS
Remote On/Off Control ➄
“N” suffix:
same as above
Negative Logic, ON state
Negative Logic, OFF state
Control Current
ON = Ground pin or external voltage
OFF = Pin open or external voltage
Open collector/drain
-0.1
2.5
0.8
15
2
V
V
mA
1
1
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
ON = Pin open or external voltage
OFF = Ground pin or external voltage
Open collector/drain
10
0
15
0.7
2
V
V
mA
SMT Mounting
"M" suffix
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MDC_ULS-30W_C08 Page 13 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-12/2.5-D48 (CONT.)
OUTPUT
Total Output Power
Conditions ➀
See Derating
Minimum
Typical/Nominal
Maximum
30
Units
W
0
30
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
No trim
At 50ꢀ load, no trim
User-adjustable
11.88
-1
-20
12.00
15
12.12
+1
+10
18
Vdc
ꢀ of Vnom
ꢀ of Vnom.
Vdc
Via magnetic feedback
13.3
Output Current Range
Minimum Load
Current Limit Inception
Short Circuit
0.0
3.3
2.5
No minimum load
3.5
2.5
4.5
A
A
98ꢀ of Vnom., after warmup
Hiccup technique, autorecovery within 1.25ꢀ
of Vout
Short Circuit Current
40
mA
Short Circuit Duration (remove short for
recovery)
Short circuit protection method
Output shorted to ground, no damage
Current limiting
Continuous
Regulation ➅
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
MECHANICAL (Through Hole Models)
Outline Dimensions
(Please refer to outline drawing)
Weight
Vin = min. to max., Vout = nom., Iout = nom.
Iout = min. to max., Vin = 48V
5 Hz- 20 MHz BW
0.125
0.125
150
ꢀ of Vout
ꢀ of Vout
mV pk-pk
ꢀ of Vout./°C
μF
130
0.02
2200
At all outputs
Low ESR, resistive load only
0
Conditions ➀ꢀ➂
1.30x0.90x0.36
33.02x22.86x9.144
0.58
Inches
mm
Ounces
Grams
Inches
mm
LxWxH
16.4
Through Hole Pin Diameter
0.04 & 0.062
1.016 & 1.575
Copper alloy
50
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Nickel subplate
Gold overplate
µ-inches
µ-inches
5
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
Relative humidity, non-condensing
Altitude
With Derating
-40
-40
-55
115
85
°C
°C
°C
°C
No derating, full power
Vin = Zero (no power)
Measured in center
105
125
130
125
External filter is required
B
B
Class
Class
ꢀRH
feet
meters
To +85°C
must derate -1ꢀ/1000 feet
10
-500
-152
90
10,000
3048
RoHS-6
RoHS rating ➃
Performance Specification Notes
➀ Unless otherwise noted, all specifications are typical at nominal input voltage, nominal output voltage
and full load. General conditions are +25° Celsius ambient temperature, near sea level altitude,
natural convection airflow. All models are tested and specified with external parallel 1 μF and 10 μF
multi-layer ceramic output capacitors. The external input capacitor is 22 μF ceramic. All capacitors
are low-ESR types wired close to the converter. These capacitors are necessary for our test equip-
ment and may not be needed in the user's application.
➂ꢀAll models are stable and regulate to specification under no load.
➃ Reduction of Hazardous Substances (RoHS) compliance is to RoHS-6 (six substances restricted
including lead). See specifications.
➄ The Remote On/Off Control is referred to -Vin.
➅ Regulation specifications describe the output voltage changes as the line voltage or load current is
varied from its nominal or midpoint value to either extreme.
➁ꢀInput (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering is
Cbus = 220 μF/100V, Cin = 33 μF/100V and Lbus = 12 μH.
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MDC_ULS-30W_C08 Page 14 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TYPICAL PERFORMANCE CURVES, ULS-12/2.5-D48
Efficiency vs. Line Voltage and Load Current @ 25°C
Power Dissipation vs. Load Current @ 25°C
ꢃꢂ
ꢃꢀ
ꢃꢁ
ꢃꢅ
ꢃꢄ
ꢆꢁꢂ
ꢆꢁꢀ
ꢅꢁꢂ
ꢅꢁꢀ
ꢄꢁꢂ
ꢄꢁꢀ
ꢃꢁꢂ
ꢃꢁꢀ
ꢀꢁꢂ
ꢋIꢌ ꢍ ꢇꢂꢋ
ꢋIꢌ ꢍ ꢉꢀꢋ
ꢋIꢌ ꢍ ꢆꢊꢋ
ꢋIꢌ ꢍ ꢅꢉꢋ
ꢀꢂ
ꢋIꢌ ꢍ ꢀꢁꢋ
ꢋIꢌ ꢍ ꢊꢆꢋ
ꢋIꢌ ꢍ ꢉꢃꢋ
ꢋIꢌ ꢍ ꢅꢊꢋ
ꢀꢀ
ꢀꢁ
ꢆꢇꢈꢁ
ꢆꢇꢉꢃ
ꢆꢇꢀꢆ
ꢆꢇꢂꢅ
ꢄꢇꢄꢁ
ꢄꢇꢅꢃ
ꢄꢇꢊꢆ
ꢄꢇꢃꢅ
ꢈꢇꢆꢁ
ꢈꢇꢈꢃ
ꢈꢇꢁꢆ
ꢀꢁꢅ
ꢀꢁꢂ
ꢀꢁꢇ
ꢀꢁꢈ
ꢃꢁꢄ
ꢃꢁꢆ
ꢃꢁꢉ
ꢃꢁꢊ
ꢄꢁꢃ
ꢄꢁꢅ
ꢄꢁꢂ
Lꢀaꢃ ꢄꢅrreꢆt ꢁꢇꢈꢉsꢂ
Load Current (Amps)
Maximum Current Temperature Derating at Sea Level
Maximum Current Temperature Derating at Sea Level
(Vin = 36V, 48V, and 75V, airflow is from pin 3 to pin 1)
(Vin = 60V, airflow is from pin 3 to pin 1)
ꢄꢁꢂ
ꢀꢁꢃ
ꢀꢁꢂ
ꢄꢁꢂ
ꢀꢁꢃ
ꢀꢁꢂ
ꢂꢁꢄꢄ to ꢀꢁꢂ m/s ꢉꢆꢃ to ꢅꢂꢂ ꢊꢋꢌꢍ
ꢂꢁꢄꢄ m/s ꢉꢆꢃ ꢊꢋꢌꢍ
ꢂꢁꢃ to ꢀꢁꢂ m/s ꢉꢎꢂꢂ to ꢅꢂꢂ ꢊꢋꢌꢍ
ꢄꢂ
ꢄꢃ
ꢅꢂ
ꢅꢃ
ꢃꢂ
ꢃꢃ
ꢆꢂ
ꢆꢃ
ꢇꢂ
ꢇꢃ
ꢈꢂ
ꢈꢃ
ꢄꢂ
ꢄꢃ
ꢅꢂ
ꢅꢃ
ꢃꢂ
ꢃꢃ
ꢆꢂ
ꢆꢃ
ꢇꢂ
ꢇꢃ
ꢈꢂ
ꢈꢃ
ꢆꢇꢉieꢄt ꢊeꢇꢂeratꢁre ꢅꢋꢃꢈ
ꢆꢇꢉieꢄt ꢊeꢇꢂeratꢁre ꢅꢋꢃꢈ
INFRARED THERMAL IMAGE, ULS-12/2.5-D48
Thermal image with hot spot at full load current with 25 °C ambient temperature. Natural convention is used with no forced airflow. Identifiable and recommended maximum value
to be verified in application. Vin=48V, Q6 max Temp=120 °C/IPC9592 guidelines.
99.5°C
(+Vin)
(+Vout)
L1:77.3
80
60
T1:79.4
CR17:94.3
Q6:94.7
R6:92.4
42.4°C
(-Vin)
(-Vout)
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MDC_ULS-30W_C08 Page 15 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
OSCILLOGRAMS, ULS-12/2.5-D48
On/Off Enable Delay (Vin = 48V, Vout = nom., Iout = 2.5A, Cload = 0 µF, Ta = +25°C.,
ScopeBW = 20MHz) Trace 1 = Enable, Trace 4 = Vout
Power On Startup Delay (Vin = 48V, Vout = nom., Iout = 2.5A, Cload = 0 µF, Ta = +25°C.,
ScopeBW = 20MHz) Trace 1 = Vin, Trace 4 = Vout
Step Load Transient Response (Vin = 48V, Vout = nom., Iout = 50-75-50ꢀ of full load,
Output Ripple and Noise (Vin = 48V, Vout = nom., Iout = no load, Cload = 1 µF ceramic ||
10µF tantalum, Ta = +25°C., ScopeBW = 20MHz)
Cload = 1 µF ceramic || 10µF tantalum, Ta = +25°C., ScopeBW = 20MHz)
Output Ripple and Noise (Vin = 48V, Vout = nom., Iout = 2.5A, Cload = 1 µF ceramic || 10µF
tantalum, Ta = +25°C., ScopeBW = 20MHz)
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MDC_ULS-30W_C08 Page 16 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-15/2-D48
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
Minimum
Typical/Nominal
Maximum
80
100
Units
Vdc
Vdc
Vdc
Vdc
Vdc
W
Conditions ➀
0
100 mS max. duration
Input to output, continuous
None, install external fuse
Power on, referred to -Vin
2250
None
0
0
15
30
Current-limited, no damage, short-circuit
protected
Output Current
0
2
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
Conditions ➀ꢀ➂
Operating voltage range
Recommended External Fuse
Start-up threshold
Undervoltage shutdown
Turn-On/Turn-Off Hysteresis
Overvoltage shutdown
Reverse Polarity Protection
Internal Filter Type
36
48
75
2
35.5
33
Vdc
A
Fast blow
Rising input voltage
Falling input voltage
32.5
31
1.42
33.5
32
1.48
None
None
Vdc
Vdc
Vdc
Vdc
Vdc
1.52
None, install external fuse
Capacitive
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load
Vin = nominal
Vin = minimum
0.7
0.94
0.05
100
25
0.714
0.95
A
A
A2-Sec.
mA
200
50
Iout = minimum, unit = ON
mA
Shut-Down Input Current (Off, UV, OT)
Reflected (back) ripple current ➁
GENERAL and SAFETY
Efficiency
5
15
10
30
mA
mA, p-p
Measured at input with specified filter
Vin = 48V, full load
Vin = min., full load
87.5
87.5
89.0
89.0
ꢀ
ꢀ
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Input to output, continuous
2250
Vdc
basic
100
1600
MΩ
pF
Certified to UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd edition
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient = +25°C
Safety
Yes
3
Calculated MTBF
Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
280
290
310
30
30
KHz
mS
mS
Power on to Vout regulated
Remote ON to Vout regulated
50-75-50ꢀ load step, settling time to within
1ꢀ of Vout
Startup Time
Dynamic Load Response
200
250
300
300
µSec
mV
Dynamic Load Peak Deviation
FEATURES and OPTIONS
Remote On/Off Control ➄
“N” suffix:
same as above
Negative Logic, ON state
Negative Logic, OFF state
Control Current
ON = Ground pin or external voltage
OFF = Pin open or external voltage
Open collector/drain
-0.1
2.5
0.8
15
2
V
V
mA
1
1
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
ON = Pin open or external voltage
OFF = Ground pin or external voltage
Open collector/drain
10
0
15
0.7
2
V
V
mA
SMT Mounting
"M" suffix
www.murata-ps.com/support
MDC_ULS-30W_C08 Page 17 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-15/2-D48 (CONT.)
OUTPUT
Total Output Power
Conditions ➀
See Derating
Minimum
Typical/Nominal
Maximum
30
Units
W
0
30
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
No trim
At 50ꢀ load, no trim
User-adjustable
14.85
-1
-20
18
15.00
19
15.15
+1
+10
20
Vdc
ꢀ of Vnom
ꢀ of Vnom.
Vdc
Via magnetic feedback
Output Current Range
Minimum Load
Current Limit Inception
Short Circuit
0.0
2.0
No minimum load
3.0
2.0
A
A
98ꢀ of Vnom., after warmup
2.45
3.45
Hiccup technique, autorecovery within 1.25ꢀ
of Vout
Short Circuit Current
0.6
A
Short Circuit Duration (remove short for
recovery)
Short circuit protection method
Output shorted to ground, no damage
Current limiting
Continuous
Regulation ➅
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
MECHANICAL (Through Hole Models)
Outline Dimensions
(Please refer to outline drawing)
Weight
Vin = min. to max., Vout = nom., Iout = nom.
Iout = min. to max., Vin = 48V
5 Hz- 20 MHz BW
0.125
0.125
125
ꢀ of Vout
ꢀ of Vout
mV pk-pk
ꢀ of Vout./°C
μF
115
0.02
2200
At all outputs
Low ESR, resistive load only
0
Conditions ➀ꢀ➂
1.30x0.90x0.36
33.02x22.86x9.144
0.58
Inches
mm
Ounces
Grams
Inches
mm
LxWxH
16.4
Through Hole Pin Diameter
0.04 & 0.062
1.016 & 1.575
Copper alloy
50
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Nickel subplate
Gold overplate
µ-inches
µ-inches
5
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
Relative humidity, non-condensing
Altitude
With Derating
-40
-40
-55
115
85
°C
°C
°C
°C
No derating, full power
Vin = Zero (no power)
Measured in center
105
125
130
125
External filter is required
B
B
Class
Class
ꢀRH
feet
meters
To +85°C
must derate -1ꢀ/1000 feet
10
-500
-152
90
10,000
3048
RoHS-6
RoHS rating ➃
Performance Specification Notes
➀ Unless otherwise noted, all specifications are typical at nominal input voltage, nominal output voltage
and full load. General conditions are +25° Celsius ambient temperature, near sea level altitude,
natural convection airflow. All models are tested and specified with external parallel 1 μF and 10 μF
multi-layer ceramic output capacitors. The external input capacitor is 22 μF ceramic. All capacitors
are low-ESR types wired close to the converter. These capacitors are necessary for our test equip-
ment and may not be needed in the user's application.
➂ꢀAll models are stable and regulate to specification under no load.
➃ Reduction of Hazardous Substances (RoHS) compliance is to RoHS-6 (six substances restricted
including lead). See specifications.
➄ The Remote On/Off Control is referred to -Vin.
➅ Regulation specifications describe the output voltage changes as the line voltage or load current is
varied from its nominal or midpoint value to either extreme.
➁ꢀInput (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering is
Cbus = 220 μF/100V, Cin = 33 μF/100V and Lbus = 12 μH.
www.murata-ps.com/support
MDC_ULS-30W_C08 Page 18 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TYPICAL PERFORMANCE CURVES, ULS-15/2-D48
Efficiency vs. Line Voltage and Load Current @ 25°C
Power Dissipation vs. Load Current @ 25°C
ꢅꢃ
ꢊꢅ
ꢊꢇ
ꢊꢆ
ꢅꢁꢂ
ꢅꢁꢀ
ꢄꢁꢂ
ꢄꢁꢀ
ꢃꢁꢂ
ꢃꢁꢀ
ꢀꢁꢂ
ꢋIꢌ ꢍ ꢇꢆꢋ
ꢋIꢌ ꢍ ꢉꢀꢋ
ꢋIꢌ ꢍ ꢈꢊꢋ
ꢋIꢌ ꢍ ꢄꢉꢋ
ꢊꢄ
ꢊꢃ
ꢇꢅ
ꢇꢇ
ꢇꢆ
ꢋIꢌ ꢍ ꢈꢂꢋ
ꢋIꢌ ꢍ ꢇꢀꢋ
ꢋIꢌ ꢍ ꢆꢊꢋ
ꢋIꢌ ꢍ ꢅꢇꢋ
ꢀꢁꢄ
ꢀꢁꢆ
ꢀꢁꢇ
ꢀꢁꢈ
ꢀꢁꢉ
ꢃꢁꢃ
ꢃꢁꢅ
ꢃꢁꢂ
ꢃꢁꢇ
ꢃꢁꢊ
ꢄꢁꢀ
ꢀꢁꢂꢃ
ꢀꢁꢄꢅ
ꢀꢁꢆꢇ
ꢀꢁꢇꢆ
ꢀꢁꢅꢄ
ꢃꢁꢃꢃ
ꢃꢁꢂꢅ
ꢃꢁꢈꢇ
ꢃꢁꢉꢆ
ꢃꢁꢊꢄ
ꢂꢁꢀꢃ
Lꢀaꢃ ꢄꢅrreꢆt ꢁꢇꢈꢉsꢂ
Load Current (Amps)
Maximum Current Temperature Derating at Sea Level
(Vin = 36V, 48V, 60V, and 75V, airflow is from pin 3 to pin 1)
ꢃꢁꢂ
ꢃꢁꢄ
ꢀꢁꢂ
ꢄꢁꢅꢅ to ꢃꢁꢄ m/s ꢊꢇꢂ to ꢆꢄꢄ ꢋꢌꢍꢎ
ꢅꢄ
ꢅꢂ
ꢆꢄ
ꢆꢂ
ꢂꢄ
ꢂꢂ
ꢇꢄ
ꢇꢂ
ꢈꢄ
ꢈꢂ
ꢉꢄ
ꢉꢂ
ꢆꢇꢉieꢄt ꢊeꢇꢂeratꢁre ꢅꢋꢃꢈ
INFRARED THERMAL IMAGE, ULS-15/2-D48
Thermal image with hot spot at full load current with 25 °C ambient temperature. Natural convention is used with no forced airflow. Identifiable and recommended maximum value
to be verified in application. Vin=48V, Q6 max Temp=120 °C/IPC9592 guidelines.
80.6°C
80
(+Vin)
(+Vout)
70
60
50
T1:62
Q6: 75
R6: 73
(-Vin)
(-Vout)
45.7°C
www.murata-ps.com/support
MDC_ULS-30W_C08 Page 19 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
OSCILLOGRAMS, ULS-15/2-D48
On/Off Enable Delay (Vin = 48V, Vout = nom., Iout = 2A, Cload = 0 µF, Ta = +25°C.,
ScopeBW = 20MHz) Trace 1 = Enable, Trace 4 = Vout
Power On Startup Delay (Vin = 48V, Vout = nom., Iout = 2A, Cload = 0 µF, Ta = +25°C.,
ScopeBW = 20MHz) Trace 1 = Vin, Trace 4 = Vout
Step Load Transient Response (Vin = 48V, Vout = nom., Iout = 50-75-50ꢀ of full load,
Cload = 1 µF ceramic || 10µF tantalum, Ta = +25°C., ScopeBW = 20MHz)
Output Ripple and Noise (Vin = 48V, Vout = nom., Iout = no load, Cload = 1 µF ceramic ||
10µF tantalum, Ta = +25°C., ScopeBW = 20MHz)
Output Ripple and Noise (Vin = 48V, Vout = nom., Iout = 2A, Cload = 1 µF ceramic || 10µF
tantalum, Ta = +25°C., ScopeBW = 20MHz)
www.murata-ps.com/support
MDC_ULS-30W_C08 Page 20 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MECHANICAL SPECIFICATIONS,THROUGH-HOLE MOUNT
Sꢀꢋꢃ ꢇꢀꢃW ꢃꢊꢋ ꢇꢀꢃW
ꢀꢁꢅꢋ
ꢃꢆꢁꢄꢎꢎꢈ
ꢀꢁꢄꢊ
ꢃꢎꢁꢂꢇꢌꢈ
ꢀꢀꢁꢀꢋꢀ ꢟ
ꢕAꢚꢗꢘIAꢉꢛ
ꢀꢁꢀꢄꢀ ꢕIꢑ
ꢐIꢑS ꢎ ꢠ ꢊ
ꢁꢀꢎꢀ ꢐIꢑSꢛ COꢐꢐꢗꢘ AꢉꢉOꢜ
ꢁꢀꢋꢌ ꢐIꢑSꢛ COꢐꢐꢗꢘ AꢉꢉOꢜ
CꢉꢗAꢘAꢑCꢗ
ꢝIꢑISꢞꢛ ꢃAꢉꢉ ꢐIꢑSꢈ
ꢒOꢉD ꢃꢂꢓꢔꢕIꢑꢈ Oꢖꢗꢘ ꢑICꢙꢗꢉ ꢃꢂꢀꢓꢔ ꢕIꢑꢈ
ꢀꢁꢀꢎꢀ ꢟ
ꢐIꢑS ꢄ-ꢅ, ꢂ-ꢇ
ꢈꢁꢄꢄꢁꢂ ꢉꢀꢊ ꢇꢀꢃW
ꢐIꢑ
ꢏꢅ
ꢄꢁꢅꢀ
ꢐIꢑ
ꢏꢊ
ꢃꢅꢅꢁꢀꢌꢈ
ꢄꢁꢄꢀꢀ
ꢃꢌꢇꢁꢆꢎꢈ
ꢐIꢑ
ꢏꢎ
ꢀSꢁꢂꢃꢄꢅꢀꢆ ꢇꢀꢃW
ꢅ
ꢎ
INPUT/OUTPUT CONNECTIONS P75
ꢂꢍ
ꢀꢁꢅꢀꢀ
ꢃꢇꢁꢋꢌꢈ
Pin
Function
-Vin
Pin
4
Function
-Vout
ꢀꢁꢄꢂꢀ
ꢃꢅꢁꢊꢄꢈ
ꢀꢁꢆꢀ
ꢋ
3
2
1
C
ꢃꢌꢌꢁꢊꢋꢈ
ꢀꢁꢄꢂꢀ
ꢃꢅꢁꢊꢄꢈ
ꢉ
ꢌ
ꢄ
ꢀꢁꢅꢀꢀ
ꢃꢇꢁꢋꢌꢈ
5
(-)Sense
Trim
ꢇꢍ
ꢊ
On/Off Control
+Vin
6
7
(+)Sense
+Vout
8
ꢀꢁꢂꢂꢀ
*Sense is included on the ULS-3.3/8-D48 and
ULS-5/6-D48 only.
ꢃꢄꢅꢁꢆꢇꢈ
C
ꢉ
The 0.18-inch pin length is shown. Please refer to the
part number structure for alternate pin lengths.
Pin material: Copper alloy. Plating: Gold over nickel
ꢍecommended ꢏootprint
ꢄꢚieꢜ ꢝhroꢞꢟh Converterꢇ
ꢝop ꢚieꢜ
Please note that some competitive units may use differ-
ent pin numbering or alternate outline views; however, all
units are plugin-compatible.
ꢏIꢊISꢑꢒD ꢑOꢌꢒ SIꢗꢒS
ꢘ ꢐIꢊS ꢈ-ꢅ, ꢕ-ꢓ
ꢄꢐꢒꢍ IꢐC-D-ꢃꢓꢕ, ꢌꢒꢚꢒꢌ Cꢇ
ꢁꢀꢆꢖ-ꢁꢀꢔꢃ
ꢄꢐꢍIꢇ
ꢄSꢒCꢇ
ꢈꢁꢈꢀꢀ
It is recommended that no parts be placed beneath
the converter.
ꢄꢃꢓꢁꢂꢆꢇ
ꢀꢁꢈꢕꢀ
ꢄꢅꢁꢖꢀꢇ
ꢖ
ꢈ
ꢃ
ꢀꢁꢆꢔ
Dimensions are in inches (mm shown for ref. only).
ꢀꢁꢅꢀꢀ
ꢄꢓꢁꢔꢃꢇ
ꢓꢛ
ꢄꢈꢈꢁꢓꢇ
ꢀꢁꢂꢃ
ꢄꢃꢅꢁꢆꢇ
ꢔ
C
C
ꢌ
ꢌ
ꢀꢁirꢂ ꢃꢄꢅꢆe ꢇrꢈꢉeꢊtiꢈꢄ
ꢀꢁꢅꢀꢀ
ꢄꢓꢁꢔꢃꢇ
ꢕꢛ
ꢅ
ꢆ
ꢀꢁꢈꢕꢀ
ꢄꢅꢁꢖꢀꢇ
ꢀꢁꢕꢕ
ꢄꢈꢆꢁꢀꢇ
ꢀꢁꢈꢀꢀ ꢉIꢊ
AꢊꢊꢋꢌAꢍ ꢍIꢊꢎ
ꢏOꢍ Aꢌꢌ ꢐIꢊ
C
Tolerances (unless otherwise specified):
.XX ꢀ.ꢀ0 (ꢀ.ꢁ)
.XXX ꢀ.ꢀꢂꢀ (ꢀ.0ꢁ)
Angles 02
ꢏIꢊISꢑꢒD ꢑOꢌꢒ SIꢗꢒS
ꢌ
ꢘ ꢐIꢊS ꢆ ꢙ ꢖ
ꢄꢐꢒꢍ IꢐC-D-ꢃꢓꢕ, ꢌꢒꢚꢒꢌ Cꢇ
ꢁꢀꢓꢀ-ꢁꢀꢖꢆ
SꢑOꢋꢌDꢒꢍS
ꢈꢁꢅꢃ
ꢄꢅꢅꢁꢕꢇ
Components are shown for reference only.
It is recommended that no parts be placed beneath converter
www.murata-ps.com/support
MDC_ULS-30W_C08 Page 21 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MECHANICAL SPECIFICATIONS, SURFACE MOUNT (MSL RATING 2)
Sꢀꢋꢃ ꢇꢀꢃW
ꢃꢊꢋ ꢇꢀꢃW
ꢀꢁꢂꢃ
ꢁꢂꢃ
ꢄꢅꢁꢆꢇꢇꢈ
ꢀꢁꢀꢆꢀ ꢐIꢑ
CꢒꢎAꢍAꢑCꢎ
ꢀꢁꢀꢃꢉ ꢔꢕꢖ
ꢄAꢒꢒ ꢖIꢑSꢈ
ꢐAꢔꢎꢍIAꢒꢗ
Sꢐꢔ COꢑꢔACꢔSꢗ COꢖꢖꢎꢍ AꢒꢒOꢕ
ꢀꢁꢆꢉꢌ
ꢍꢎꢏ
ꢏIꢑISꢘꢗ ꢄAꢒꢒ ꢖIꢑSꢈ
ꢙOꢒD ꢄꢌꢚꢛꢐIꢑꢈ Oꢜꢎꢍ ꢑICꢝꢎꢒ ꢄꢌꢀꢚꢛ ꢐIꢑꢈ
ꢈꢁꢄꢄꢁꢂ ꢉꢀꢊ ꢇꢀꢃW
ꢆꢁꢂꢀ
ꢄꢂꢂꢁꢀꢉꢈ
ꢆꢁꢆꢀꢀ
ꢄꢉꢊꢁꢅꢇꢈ
ꢖIꢑ
ꢞꢋ
ꢂ
ꢇ
ꢀꢁꢂꢀꢀ
ꢄꢊꢁꢃꢉꢈ
ꢌꢓ
ꢀꢁꢆꢌꢀ
ꢄꢂꢁꢋꢆꢈ
ꢀꢁꢅꢀ
ꢖIꢑ
ꢞꢇ
ꢃ
ꢄꢉꢉꢁꢋꢃꢈ
C
ꢀꢁꢆꢌꢀ
ꢄꢂꢁꢋꢆꢈ
ꢒ
ꢀSꢁꢂꢃꢄꢅꢀꢆ ꢇꢀꢃW
ꢉ
ꢆ
ꢀꢁꢂꢀꢀ
ꢄꢊꢁꢃꢉꢈ
ꢊꢓ
ꢋ
INPUT/OUTPUT CONNECTIONS P75
Pin
Function
-Vin
Pin
4
Function
-Vout
ꢀꢁꢌꢌꢀ
ꢄꢆꢂꢁꢅꢊꢈ
3
5
(-)Sense
Trim
C
ꢒ
2
1
On/Off Control
+Vin
6
7
(+)Sense
+Vout
8
ꢀecommended ꢁootprint
ꢂꢃieꢄ ꢅhroꢆꢇh Converterꢈ
ꢅop ꢃieꢄ
Please note that some competitive units may use
different pin numbering or alternate outline views;
however, all units are plugin-compatible.
ꢂꢖꢀIꢈ
ꢂSꢘCꢈ
It is recommended that no parts be placed
beneath the converter.
ꢉꢊꢉꢋꢋ
ꢂꢌꢍꢊꢎꢏꢈ
ꢋꢊꢉꢒꢋ
ꢂꢑꢊꢓꢋꢈ
Sense is included on the ULS-3.3/8-D48 and
ULS-5/6-D48 only.
ꢓ
ꢉ
ꢌ
ꢋꢊꢏꢐ
ꢍꢛ
ꢐ
ꢋꢊꢑꢋꢋ
ꢂꢍꢊꢐꢌꢈ
ꢂꢉꢉꢊꢍꢈ
ꢋꢊꢎꢌ
ꢂꢌꢑꢊꢏꢈ
C
C
ꢗ
ꢗ
Dimensions are in inches (mm shown for ref. only).
ꢋꢊꢑꢋꢋ
ꢂꢍꢊꢐꢌꢈ
ꢒꢛ
ꢏ
ꢀꢁirꢂ ꢃꢄꢅꢆe ꢇrꢈꢉeꢊtiꢈꢄ
ꢑ
ꢋꢊꢉꢒꢋ
ꢂꢑꢊꢓꢋꢈ
ꢋꢊꢒꢒ
ꢂꢉꢏꢊꢋꢈ
ꢋꢊꢋꢍꢋ ꢔIꢕ ꢖAD
ꢂꢐ or ꢓ ꢖꢗS
AS ꢀꢘꢙꢚIꢀꢘDꢈ
C
ꢗ
ꢉꢊꢑꢌ
ꢂꢑꢑꢊꢒꢈ
Tolerances (unless otherwise specified):
.XX ꢀ.ꢀ0 (ꢀ.ꢁ)
.XXX ꢀ.ꢀꢂꢀ (ꢀ.0ꢁ)
Angles 02
Components are shown for reference only.
It is recommended that no parts be placed beneath converter
www.murata-ps.com/support
MDC_ULS-30W_C08 Page 22 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
SHIPPING TRAYS AND BOXES,THROUGH-HOLE MOUNT
ꢊꢂꢃꢁ ꢄꢀꢀꢊꢂꢋꢈ ꢂꢅꢃ
Closed heiꢌht
ꢋꢅ ꢍnits per traꢎ
ꢊ traꢎs per box
ꢀꢀꢂꢁꢁ ꢄꢅꢇꢉꢂꢊꢈ ꢂꢅꢃ
ꢀꢁꢂꢃꢁ ꢄꢅꢆꢆꢂꢇꢈ ꢂꢅꢃ
ꢏach static dissipative polꢎethꢎlene ꢐoam traꢎ accommodates ꢋꢅ converters in a ꢊ x ꢑ arraꢎꢂ
SHIPPING TRAY DIMENSIONS
ꢀaterialꢁ ꢂoꢃ densitꢄ, closed cell polꢄethꢄlene anti-static ꢅoam
ꢐꢈꢎꢆ
ꢋꢉꢌꢇꢈꢇꢇꢍ
ꢇꢈꢎꢏ
ꢋꢉꢉꢈꢇꢇꢍ
ꢇꢈꢌꢐ
ꢋꢑꢌꢈꢇꢇꢍ
ꢆ-C ꢇꢈꢉꢊ
ꢋꢊꢈꢌꢍ
Dimensions are in inches (mm shown for ref. only).
ꢀꢁirꢂ ꢃꢄꢅꢆe ꢇrꢈꢉeꢊtiꢈꢄ
Tolerances (unless otherwise specified):
.XX ꢀ.ꢀ0 (ꢀ.ꢁ)
.XXX ꢀ.ꢀꢂꢀ (ꢀ.0ꢁ)
Angles ꢂ1
ꢓꢇꢈꢒꢑ
ꢋꢎꢈꢇꢇꢍ
Components are shown for reference only.
ꢇꢈꢌꢑ
ꢋꢑꢒꢈꢇꢇꢍ
ꢑꢈꢒꢆ
ꢋꢒꢆꢈꢇꢇꢍ
ꢑꢈꢐꢏ
ꢋꢌꢇꢈꢇꢇꢍ
ꢇꢈꢒꢑ
ꢋꢎꢈꢇꢇꢍ
www.murata-ps.com/support
MDC_ULS-30W_C08 Page 23 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TAPE AND REEL INFORMATION (MSL RATING 2)
ꢗeed ꢅꢌnꢘindꢇ
Direction ----
ꢀꢁꢑꢄ
ꢅꢂꢁꢃꢃꢒꢇ
ꢀꢁꢀꢒꢆ
ꢅꢑꢁꢝꢃꢇ
ꢊin ꢜꢑ
ꢙoꢚnd
ꢖoles
ꢀꢁꢓꢃ
ꢅꢔꢑꢁꢃꢆꢇ
ꢑꢁꢝꢂꢔ
ꢅꢄꢄꢁꢀꢀꢇ
ꢑꢁꢔꢒ
ꢅꢂꢔꢁꢀꢇ
ꢊIꢕCꢖ
Oblonꢛ
ꢖoles
ꢀꢁꢂꢃꢄꢅꢆꢁꢀꢀꢇ ꢈAꢉ
ꢊICꢋꢌꢊ ꢍOꢎꢎꢏꢐ
ꢕop Cover ꢕape
ꢑꢂꢁꢀꢀ
ꢅꢂꢂꢀꢁꢔꢀꢇ
ꢕAꢊꢐ AꢍD ꢙꢐꢐꢏ
ꢅꢔꢀꢀ ꢌꢍIꢕS
ꢊꢐꢙ ꢙꢐꢐꢏꢇ
ꢄꢁꢀꢀ
ꢅꢑꢀꢑꢁꢒꢀꢇ
COꢙꢐ
ꢁꢃꢑꢔ
ꢅꢑꢂꢁꢀꢀꢇ
ꢑꢁꢝꢂ
ꢅꢄꢄꢁꢀꢇ
ꢙꢐꢗ
Dimensions are in inches (mm shown for ref. only).
ꢀꢁirꢂ ꢃꢄꢅꢆe ꢇrꢈꢉeꢊtiꢈꢄ
Tolerances (unless otherwise specified):
.XX ꢀ.ꢀ0 (ꢀ.ꢁ)
.XXX ꢀ.ꢀꢂꢀ (ꢀ.0ꢁ)
Angles ꢂ1
Components are shown for reference only.
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MDC_ULS-30W_C08 Page 24 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TECHNICAL NOTES
Input Fusing
I/O Filtering, Input Ripple Current, and Output Noise
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 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 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 specific
system configuration may necessitate additional considerations.
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, i.e. IEC/EN/UL60950-1.
TO
Input Reverse-Polarity Protection
CURRENT
PROBE
OSCILLOSCOPE
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.
+VIN
–VIN
LBUS
+
VIN
CBUS
CIN
–
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.
C
IN = 33µF, ESR < 700mΩ @ 100kHz
BUS = 220µF, ESR < 100mΩ @ 100kHz
C
L
BUS = 12µH
Figure 2. Measuring Input Ripple Current
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.
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.
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.
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.
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.
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.
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MDC_ULS-30W_C08 Page 25 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
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
indefinite short circuit output condition.
+VOUT
–VOUT
RLOAD
SCOPE
C1
C2
C1 = 1µF
C2 = 10µF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
On/Off Control
Figure 3. Measuring Output Ripple/Noise (PARD)
The input-side, remote On/Off Control function can be ordered to operate with
either logic type:
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.
Positive ("P" suffix) logic models are enabled when the on/off pin is
left open (or is pulled high, applying +10V to +15V with respect to –Input).
Positive-logic devices are disabled when the on/off pin is pulled low (0 to 0.7V
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 4.
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.
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.
+VIN
+Vcc
Current Limiting
13V CIRCUIT
As soon as the output current increases to approximately 130ꢀ 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.
ON/OFF
CONTROL
5V CIRCUIT
–VIN
Figure 4. Driving the Negative Logic On/Off Control Pin (simplified circuit)
+VOUT
–VIN
+VOUT
–VIN
RTRIM DOWN
ON/OFF
TRIM
ON/OFF
CONTROL
TRIM
LOAD
LOAD
CONTROL
RTRIM UP
+VIN
+VIN
–VOUT
–VOUT
Figure 5. Trim Connections To Increase Output Voltages.
If units have sense pins, Connect trim to + Sense pin.
Figure 6. Trim Connections To Decrease Output Voltages.
If units have sense pins, connect Trim to (-) Sense pins.
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MDC_ULS-30W_C08 Page 26 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
Remote Sense (ULS-3.3/8-D48 and ULS-5/6-D48 models only)
Note: The Sense and VOUT lines are internally connected through low-value
resistors. Nevertheless, if the sense function is not used for remote regula-
tion 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
conductors 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.
ꢁriꢂ ꢇꢈꢉatiꢄꢆs
ꢁriꢂ ꢃꢄꢅꢆ
511
RT DOWN (kΩ) =
Where ∆% = |(
ꢀ 10.22
∆%
VNOM – VDES
VNOM
× 100
)|
ꢁriꢂ Uꢊ
5.11 × VNOM × (100 + ∆%)
1.225 × ∆%
511
∆%
ꢀ 10.22
ꢀ
RT UP (kΩ) =
[VOUT(+)-VOUT(–)] – [Sense(+)-Sense(–)] ≤ 10ꢀVOUT
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:
ꢋꢄteꢌ “∆%” is always a positive value.
“VNOM” is the nominal, rated output voltage.
“VDES” is the desired, changed output voltage.
(VOUT at pins) x (IOUT) ≤ rated output power
Contact and PCB resistance
losses due to IR drops
+VOUT
+VIN
IOUT
+SENSE
Sense Current
ON/OFF
CONTROL
TRIM
–SENSE
–VOUT
LOAD
Sense Return
IOUT Return
–VIN
Contact and PCB resistance
losses due to IR drops
Figure 7. Remote Sense Circuit Configuration
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MDC_ULS-30W_C08 Page 27 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
Trimming by Using an External Voltage Source
+VOUT
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.
+VIN
External
+SENSE
source
+
–
Vo
ON/OFF
CONTROL
TRIM
–SENSE
–VOUT
LOAD
Vtrim = 2 x 1.24 x
− 1.24
Vonominal
Vo is the output voltage you want; Vonominal is the nominal output voltage;
Vtrim is the voltage that should appear at the trim pin.
–VIN
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.
Figure 8. Trimming with an external source
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.
Through-hole Soldering Guidelines
SMT Reflow 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
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
these specifications may cause damage to the product. Your production environment may the success of SMT reflow soldering. Since your production environment may differ,
please thoroughly review these guidelines with your process engineers.
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
Maximum Pot Temperature
Maximum Solder Dwell Time
For Sn/Pb based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
115° C.
270° C.
7 seconds
105° C.
250° C.
6 seconds
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MDC_ULS-30W_C08 Page 28 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
Emissions Performance
[4] Conducted Emissions Test Results
Murata Power Solutions measures its products for radio frequency emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your
own emissions testing, make sure the output load is rated at continuous power
while doing the tests.
The recommended external input and output capacitors (if required) are
included. Please refer to the fundamental switching frequency. All of this
information is listed in the Product Specifications. An external discrete filter is
installed and the circuit diagram is shown below.
ꢊest Card
ꢉesistive ꢁoad
Cꢍ
ꢁꢀ
ꢋꢋꢊ
ꢅꢆ
DC Soꢇrce
ꢉesistive ꢁoad
inside a metal
container
ꢈlack
ꢅinꢆ
ꢅin-
ꢅoꢇtꢆ
Cꢂ
Cꢀ
Cꢄ
Cꢃ
ꢁꢂ
Graph 1. ULS-3.3/8-D48N-C conducted emissions performance, Peak Detection Mode,
CISPR/EN55022, Class B, full load at 48Vin
ꢅ-
ꢅoꢇt-
Cꢌ
Figure 9. Conducted Emissions Test Circuit
[1] Conducted Emissions Parts List
Reference
Part Number
PE-62913
NC
Description
1mH, 6A
Vendor
Pulse
Murata
L1
L2
4.7uH, 3.6A
Ceramic Capacitor
C1, C2
VZ Series
(3.2uf) = 2.2ufd/1ufd in
parallel, 100V
Panasonic
Qty 2 - Electrolytic Capacitor
22ufd, 100V
3.3nF, 1500V
Electrolytic Capacitor 33ufd,
100V
C3
C4, C5
C6
VZ Series
Unknown
VZ Series
Panasonic
Unknown
Panasonic
Graph 2. ULS-12/2.5-D48N-C conducted emissions performance, Peak Detection Mode,
CISPR/EN55022, Class B, full load at 48Vin
[2] Conducted Emissions Test Equipment Used
Rohde & Schwarz EMI Test Receiver (9KHz – 1000MHz) ESPC
Rohde & Schwarz Software ESPC-1 Ver. 2.20
HP11947A Transient Limiter (Agilent)
OHMITE 25W – Resistor combinations
DC Source Programmable DC Power Supply Model 62012P-100-50
[3] Layout Recommendations
Most applications can use the filtering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional filter components and/or
shielding. Emissions performance will depend on the user’s PC board layout,
the chassis shielding environment and choice of external components. Please
refer to Application Note GEAN-02 for further discussion.
Since many factors affect both the amplitude and spectra of emissions, we
recommend using an engineer who is experienced at emissions suppression.
Graph 3. ULS-15/2-D48P-C conducted emissions performance, Peak Detection Mode,
CISPR/EN55022, Class B, full load at 48Vin
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MDC_ULS-30W_C08 Page 29 of 30
ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
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
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.
IR Transparent
optical window
Variable
speed fan
Unit under
test (UUT)
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.
IR Video
Camera
Both through-hole and surface mount converters are
soldered down to a host carrier board for realistic heat
absorption 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 measurement conditions can be studied.
Heating
element
Precision
low-rate
anemometer
3” below UUT
The collimator reduces the amount of turbulence adjacent
to the UUT by minimizing airflow turbulence. Such turbu-
lence 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.
Ambient
temperature
sensor
Airflow
collimator
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.
Figure 10. Vertical Wind Tunnel
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/
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
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.
© 2017 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_ULS-30W_C08 Page 30 of 30
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