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
36 to 75 Volts DC inputs and delivers fixed outputs
regulated to within ±0.125%. 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 -20% to
+10% 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
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.
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.
F1
+Vin (1)
Isolation
Barrier
• Switching
• Filters
Controller
and Power
Transfer
• Current Sense
+Vout (8)
+Sense (7)*
External
DC
Power
Source
On/Off
Control
(2)
Open = On
Closed = Off
(Positive
logic)
-Vin (3)
-Sense (5)*
Reference and
Error Amplifier
Trim (6)
-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
Root Model
ULS-3.3/8-D48
ULS-5/6-D48
ULS-12/2.5-D48
ULS-15/2-D48
V
out
(V)
3.3
5
12
15
I
out
Power
(A, max.)
(W)
8
6
2.5
2
26.5
30
30
30
R/N (mV pk-pk)
Typ.
90
75
130
115
Max.
130
100
150
125
Regulation (max.)
➂
Line
±0.1%
±0.125%
±0.125%
±0.125%
Load
±0.1%
±0.1%
±0.125%
±0.125%
V
in
Nom.
(V)
48
48
48
48
Range
(V)
36-75
36-75
36-75
36-75
Input
I
in
, no load
(mA)
75
20
25
25
I
in
, full
load (A)
0.58
0.69
0.71
0.70
Efficiency
Min.
89%
89%
86%
87.5%
Typ.
90%
91%
87.7%
89%
1.30x0.90x0.36
1.30x0.90x0.36
1.30x0.90x0.36
1.30x0.90x0.36
Case (inches)
Please refer to the Part Number Structure when ordering.
Regulation specifications describe output voltage deviations from a nominal/midpoint value to either
All specifications are typical at nominal line voltage and full load, +25°C unless otherwise noted. See
extreme (50% load step).
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
SMT Version
Blank = Through-hole mount, no SMT
M = Surface mount (MSL Rating 2)
➁
Nominal Output Voltage:
Maximum Rated Output Current
Current in Amps
Input Voltage Range:
D48 = 36-75 Volts (48V nominal)
On/Off Control Logic:
N = Negative
P = Positive
➀
Special quantity order is required; samples available with standard pin length only.
➁
SMT (M) versions not available in sample quantities.
➂
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
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
Output Current
Conditions
➀
100 mS max. duration
Input to output, continuous
None, install external fuse
Power on, referred to -Vin
Minimum
0
Typical/Nominal
Maximum
80
100
2250
Units
Vdc
Vdc
Vdc
Vdc
Vdc
W
None
0
0
15
26.66
Current-limited, no damage, short-circuit
0
8
A
protected
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
Recommended External Fuse
Start-up threshold
Undervoltage shutdown
Turn-On/Turn-Off Hysteresis
Overvoltage shutdown
Reverse Polarity Protection
Internal Filter Type
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
Conditions
➀ ➂
36
Fast blow
Rising input voltage
Falling input voltage
34
32
48
35.2
34
1.5
None
None
LC
0.58
0.77
0.05
50
75
1
30
89
89.5
2250
basic
10
1000
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
320
Power on to Vout regulated
Remote ON to Vout regulated
50-75-50% load step, settling time to within
2% of Vout
same as above
Yes
2
350
380
50
50
150
±100
Hours x 10
6
KHz
mS
mS
µSec
mV
MΩ
pF
90
90.5
75
1.5
36
35.2
Vdc
A
Vdc
Vdc
Vdc
Vdc
Vdc
None, install external fuse
Vin = nominal
Vin = minimum
0.63
0.83
100
100
2
Iout = minimum, unit = ON
Measured at input with specified filter
Vin = 48V, full load
Vin = min., full load
Input to output, continuous
A
A
A
2
-Sec.
mA
mA
mA
mA, p-p
%
%
Vdc
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
100
±30
FEATURES and OPTIONS
Remote On/Off Control
➄
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
SMT Mounting
ON = Ground pin or external voltage
OFF = Pin open or external voltage
Open collector/drain
ON = Pin open or external voltage
OFF = Ground pin or external voltage
Open collector/drain
"M" suffix
-0.7
10
1
10
-0.7
1
1.2
15
V
V
mA
V
V
mA
15
1.2
www.murata-ps.com/support
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
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
Output Current Range
Minimum Load
Current Limit Inception
Short Circuit
Short Circuit Current
Short Circuit Duration (remove short for
recovery)
Short circuit protection method
Regulation
➅
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
Conditions
➀
See Derating
No trim
At 50% load, no trim
User-adjustable
Via magnetic feedback
Minimum
2.61
3.2674
-1
-10
4.2
0.8
Typical/Nominal
25
3.3
Maximum
26.66
3.333
1
10
5.7
8
11.3
0.3
Units
W
Vdc
% of Vnom
% of Vnom.
Vdc
A
A
mA
5
8
10
98% of Vnom., after warmup
Hiccup technique, autorecovery within ±1.25%
of Vout
Output shorted to ground, no damage
Current limiting
Vin = min. to max., Vout = nom., Iout = nom.
Iout = min. to max., Vin = 48V
5 Hz- 20 MHz BW
At all outputs
Low ESR, resistive load only
8.5
Continuous
90
±0.02
±0.1
±0.1
130
2000
% of Vout
% of Vout
mV pk-pk
% of Vout./°C
μF
Inches
mm
Ounces
Grams
Inches
mm
µ-inches
µ-inches
MECHANICAL (Through Hole Models)
Outline Dimensions
(Please refer to outline drawing)
Weight
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Conditions
➀ ➂
LxWxH
1.30x0.90x0.36
33.02x22.86x9.144
0.58
16.4
0.04 & 0.062
1.016 & 1.575
Copper alloy
50
5
-40
-40
-55
110
85
70
125
120
Nickel subplate
Gold overplate
With Derating
No derating, full power, 200lfm, Vertical mount
Vin = Zero (no power)
Measured in center
External filter is required
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
RoHS rating
➃
°C
°C
°C
°C
Class
Class
%RH
feet
meters
115
B
B
To +85°C
must derate -1%/1000 feet
10
-500
-152
RoHS-6
90
10,000
3048
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.
➁ Input
(back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering is
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.
www.murata-ps.com/support
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
92
90
88
86
84
82
80
78
76
74
72
70
68
66
64
0.00
0.81
1.61
Maximum Current Temperature Derating at Sea Level
(V
in
= 36-75V, airflow is from pin 1 to pin 3)
8
Output Current (Amps)
7
6
5
4
3
2
1
0
30
35
40
45
50
55
60
65
Ambient Temperature (ºC)
70
75
80
85
0.33 to 2.0 m/s (65 to 400 LFM)
Efficiency (%)
V
IN
= 75V
V
IN
= 60V
V
IN
= 48V
V
IN
= 36V
2.41
3.21
4.01
4.81
Load Current (Amps)
5.61
6.41
7.21
8.01
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.
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