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.
+SENSE
(7)
+Vin
(1)
+Vout
(8)
SWITCH
CONTROL
-Vout
(4)
-Vin
(3)
PULSE
TRANSFORMER
-SENSE
(5)
REFERENCE
ERROR AMP
INPUT
UNDER VOLTAGE,
OVER TEMPERATURE,
AND OUTPUT
OVER VOLTAGE
COMPARATORS
PWM
CONTROLLER
OPTO
ISOLATION
Vout
TRIM
(6)
REMOTE
ON/OFF
CONTROL
(2)
Typical topology is shown
Figure 1. Simplified Block Diagram
For full details go to
www.murata-ps.com/rohs
REG.-Nr. D216
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MDC_ULS Series.B26
Page 1 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
Root Model
V
OUT
(V)
3.3
5
12
I
OUT
Power R/N (mV pk-pk)
(A, max.) (W)
Typ.
Max.
20
12
5
66
60
60
70
50
80
120
80
120
Regulation (max.)
Line
±0.1%
±0.125%
±0.125%
Load
±0.2%
±0.25%
±0.25%
Input
V
IN
Nom. Range I
IN
, no load
(V)
(V)
(mA)
48
48
48
36-75
36-75
36-75
20
40
50
I
IN
, full
load (A)
1.53
1.39
1.37
Efficiency
Min.
89%
88%
88%
Typ.
90%
90%
91%
C76
Package
Case (inches)
0.9x1.3x0.40
0.9x1.3x0.40
0.9x1.3x0.40
ULS-3.3/20-D48N-C
ULS-5/12-D48N-C
ULS-12/5-D48N-C
Please refer to the Part Number Structure when ordering.
I/O caps are necessary for our test equipment and may not be needed for your application.
These specifications are preliminary. Contact Murata Power Solutions for availability.
➃
Regulation specifications describe output voltage deviations from a nominal/midpoint value to either
All specifications are at nominal line voltage and full load, +25°C unless otherwise noted. See detailed
extreme (50% load step).
specifications. Output capacitors are 1 μF ceramic multilayer in parallel with 10 μF electrolytic.
PART NUMBER STRUCTURE
ULS
-
3.3
/
20
-
D48 N M H Lx
-
C
RoHS Hazardous Substance Compliance
(does not claim EU RoHS exemption 7b–lead in solder)
C = RoHS-6
Y = RoHS-5
Sixteenth Brick Series
Pin Length Option (Thru-hole only)
Blank = Standard pin length 0.180˝ (4.6mm)
L1 = 0.110˝ (2.79mm)*
L2 = 0.145˝ (3.68mm)*
Conformal Coating:
Blank = No coating, standard
H = Coating added, optional special order
SMT Version
Blank = Through-hole mount, no SMT
M = Surface mount (MSL Rating 3)
On/Off Control Logic:
N = Negative
P = Positive
*Special quantity order is required;
no sample quantities available.
Note:
Some model number combinations
may not be available. Please contact
Murata Power Solutions.
Nominal Output Voltage:
Maximum Rated Output Current
Current in Amps
Input Voltage Range:
D48 = 36-75 Volts (48V nominal)
www.murata-ps.com/support
MDC_ULS Series.B26
Page 2 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-3.3/20-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
Full power operation
Operating or non-operating, tested:
100 mS max. duration
Input to output
None, install external fuse
Power on, referred to -Vin
Minimum
Typical/Nominal
Maximum
80
100
2250
Units
Vdc
Vdc
Vdc
Vdc
Vdc
W
None
0
0
15
66.66
Current-limited, no damage,
0
20
A
short-circuit 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
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
Falling input voltage
31.5
32.5
33.5
Vdc
Undervoltage shutdown, turn off
12
Overvoltage protection
NA
Vdc
Reverse Polarity Protection
None, install external fuse
None
Vdc
Internal Filter Type
Capacitive
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load input current
Shut-Down Mode Input Current
Reflected (back) ripple current
➁
Reflected (back) ripple current
➁
Pre-biased startup
Vin = nominal
Vin = minimum
Iout = minimum, unit=ON
no filtering
Measured at input with specified filter
External output voltage < Vset
1.53
2.08
0.05
150
30
5
150
20
The converter will
start if the external
load pre-bias does
not exceed Vnom
89
86
90
88
1.56
2.15
300
100
15
210
30
A
A
A2-Sec.
mA
mA
mA
mAp-p
mAp-p
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage, input to output
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety (meets the following requirements)
Calculated MTBF
Calculated MTBF
➃
Vin=48V, full load
Vin=Min
%
%
2250
Vdc
MΩ
pF
basic
100
1000
UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd Edition
Per MIL-HDBK-217F, ground benign,
Tambient=+40°C
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient=+40°C
480
Power on, Vout regulated
Remote ON to Vout regulated
50-75-50% load step, settling time to within
1% of Vout.
same as above
Yes
TBD
3200
500
5
5
50
±150
520
15
10
150
±200
Hours x 10
3
Hours x 10
3
KHz
mS
mS
μSec
mV
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
19
FEATURES and OPTIONS
Remote On/Off Control
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
ON = Pin grounded or external voltage
OFF = Pin open or external voltage
open collector/drain
-0.1
2.5
1
0.8
15
2
V
V
mA
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MDC_ULS Series.B26
Page 3 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-3.3/20-D48 (CONT.)
FEATURES and OPTIONS (cont.)
Remote On/Off Control (cont.)
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
Conditions
➀
Minimum
Typical/Nominal
Maximum
Units
ON = Pin open or external voltage
OFF = Ground pin or external voltage
open collector/drain
3.5
0
1
0
66
3.3
15
1
2
66.66
3.333
1
10
4.95
V
V
mA
W
Vdc
% of Vset
Vdc
%
A
A
A
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
➂
15
Settling Accuracy
Output Voltage Range
➇
Overvoltage Protection
Remote Sense Compensation
Current
Output Current Range
Minimum Load
Current Limit Inception
13
Short Circuit
➄
Short Circuit Current
Short Circuit Duration
(remove short for recovery)
Short circuit protection method
Regulation
Line Regulation
➆
Load Regulation
➆
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
(10% ceramic, 90% Oscon)
No trim
At 50% load
User-adjustable
Via magnetic feedback
Of Vset
18
3.267
-1
-10
3.75
4.25
10
20
No minimum load
26
6.6
Continuous
0
98% of Vnom., cold condition
Hiccup technique, autorecovery within ±1%
of Vout
Output shorted to ground, no damage
Hiccup current limiting
Vin=min. to max., Vout=nom., nom load
Iout=min. to max
5 Hz- 20 MHz BW
At all outputs
Low ESR, .02 ohms max (resistive load)
Cxx case
WxLxH
22
20
30
±0.1
±0.2
70
0.02
1000
1.3x0.9x0.4
33x22.9x10.2
0.58
16.4
.062 & .04
1.575 & 1.016
Gold-plated copper
alloy with nickel
underplate
50
5
-40
-55
-40
110
120
V
V
mV pk-pk
% of Vout./°C
μF
Inches
mm
Ounces
Grams
Inches
mm
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
Nickel subplate
Gold overplate
No derating, full power, 200 LFM,
no condensation
Vin = Zero (no power)
No derating required
Measured at hotspot
External filter is required
μ-inches
μ-inches
85
125
120
120
°C
°C
°C
°C
Class
Class
ENVIRONMENTAL
Operating Ambient Temperature Range
Storage Temperature
Operating Case Temp
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
RoHS rating
11
115
B
B
RoHS-6
www.murata-ps.com/support
MDC_ULS Series.B26
Page 4 of 24
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
TYPICAL PERFORMANCE DATA, ULS-3.3/20-D48
Efficiency vs. Line Voltage and Load Current @ 25°C
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