Featuring a full 25 Watt output in one square inch
of board area, the UEI25 series isolated DC/DC
converter family offers efficient regulated DC power
for printed circuit board mounting. The 0.96" x 1.1"
x 0.32" (24.4 x 27.9 x 8.1 mm) converter accepts a
2:1 input voltage range of 36 to 75 Volts DC, ideal
for telecom equipment. The industry-standard pin-
out fits larger 1" x 2" converters. The fixed output
voltage is tightly regulated. Applications include
small instruments, area-limited microcontrollers,
data communications equipment, remote sensor
systems, telephone equipment, vehicle and portable
electronics.
The UEI25 series includes full magnetic and
optical isolation with Basic protection up to 2250
Volts DC. For powering digital systems, the outputs
offer fast settling to step transients and will accept
higher capacitive loads. Excellent ripple and noise
specifications assure compatibility to noise-sus-
ceptible circuits. For systems requiring controlled
startup/shutdown, an external remote On/Off control
may use a switch, transistor or digital logic.
A wealth of self-protection features avoid both
converter and external circuit faults. These include
input undervoltage lockout and overtemperature
shutdown. The outputs current limit using the
“hiccup” autorestart technique and the outputs are
short-circuit protected. Additional features include
output overvoltage and reverse conduction elimina-
tion. The high efficiency offers minimal heat buildup
and “no fan” operation.
F1
+Vin (1)
Barrier
+Vout (3)
External
DC
Power
Source
On/Off
Control
(6)
Controller
and Power
Open = On
Reference and
Error Amplifier
Trim (4)
polarity)
-Vin (2)
-Vout (5)
Figure 1. Connection Diagram
Typical topology is shown. Murata Power Solutions
recommends an external fuse.
For full details go to
www.murata-ps.com/rohs
REG.-Nr. D806
www.murata-ps.com/support
MDC_UEI25W.B07
Page 1 of 24
UEI25 Series
Single Output Isolated 25-Watt DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
➀ ➂
Output
Input
I
IN
,
full
load
(A)
0.58
0.57
0.6
Root Models
➀
UEI25-033-D48
➃
UEI25-050-D48
UEI25-120-D48
V
OUT
(V)
3.3
5
12
R/N (mVp-p) Regulation (Max.)
I
IN
,
min.
I
OUT
Total
V
IN
(A, Power
Nom. Range load
Line
Load
max) (W) Typ.
➁
Max.
(V)
(V) (mA)
7.5
5
2.1
25
25
25.2
50
50
95
80
80
120
±0.1%
±0.1%
±0.1%
±0.2%
±0.2%
±0.1%
48
48
48
36-75
36-75
36-75
75
30
20
Efficiency
Package, C75
Min.
89.0%
Typ.
91%
Case (inches)
0.96x1.1x0.32
0.96x1.1x0.32
0.96x1.1x0.32
Case (mm)
24.4x27.9x8.1
24.4x27.9x8.1
24.4x27.9x8.1
Pinout
P85
P85
P85
87.0% 89.5%
86.0% 87.5%
Notes:
➀
Please refer to the part number structure for additional options and complete order-
ing part numbers.
➁
Ripple and Noise is shown at 20 MHz bandwidth.
➂
All specifications are at nominal line voltage and full load, +25 °C. unless otherwise
noted. See detailed specifications for full conditions.
Output capacitors are 1 μF ceramic in parallel with 10 μF electrolytic. The input cap
is 4.7 μF ceramic, low ESR.
I/O caps are necessary for our test equipment and may not be needed for your ap-
plication.
➃
Minimum load is 10% for rated specifications.
PART NUMBER STRUCTURE
UEI25
-
033
-
D48 P M Lx
-
C
Unipolar Output Isolated
25-Watt Series
Nominal Output Voltage
in Tenths of a Volt
RoHS-6 Hazardous Substance Compliance
(Does not claim EU RoHS exemption 7b, lead in solder)
Pin Length Option (through-hole only)
Blank
= Std. pin length 0.25˝ (6.3mm)
L1
= 0.110˝ (2.79mm)*
L2
= 0.145˝ (3.68mm)*
Note:
Some model number combinations
may not be available.
Contact Murata Power Solutions.
Input Voltage Range
D48 = 36-75 Vdc
Surface Mount Option
Blank
= Through-hole mount
M
= Surface mount (MSL rating 2)
On/Off Control Logic:
P = Positive
N = Negative
*Alternate pin lengths may
require quantity order.
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MDC_UEI25W.B07
Page 2 of 24
UEI25 Series
Single Output Isolated 25-Watt DC/DC Converters
FUNCTIONAL SPECIFICATIONS – MODEL UEI25-033-D48
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Conditions
➀
Full power operation
Operating or non-operating, 100 mS max.
duration
Input to output
None, install external fuse
Power on or off, referred to -Vin
Minimum
0
0
Typical/Nominal
Maximum
80
100
Units
Vdc
Vdc
Isolation Voltage
2250
Vdc
Input Reverse Polarity
None
Vdc
On/Off Remote Control
0
15
Vdc
Output Power
0
25.25
W
Output Current
Current-limited, no damage, short-circuit protected
0
7.5
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
Recommended External Fuse
Start-up threshold
Undervoltage shutdown
Overvoltage shutdown
Reverse Polarity Protection
Internal Filter Type
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load
Standby Mode (Off, UV, OT)
Reflected (back) ripple current
➁
Pre-biased startup
36
Fast blow
Rising input voltage
Falling input voltage
None, install external fuse
34
32
48
35.2
34.0
None
None
LC
0.58
0.79
0.05
50
75
1
30
Monotonic
87
86.5
2250
basic
10
1000
Certified to UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd edition
Per MIL-HDBK-217F, ground benign,
Tambient=+30˚C
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient=+40°C
300
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
TBD
2
330
360
50
50
250
2
±100
Hours x 10
6
Hours x 10
6
KHz
mS
mS
μSec
A/μSec
mV
Mohm
pF
89.5
87.5
75
1.5
36
35.2
Vdc
A
Vdc
Vdc
Vdc
Vdc
Vin = nominal
Vin = minimum
0.60
0.81
100
100
2
Iout = minimum, unit=ON
Measured at input with specified filter
External output voltage < Vset
Vin=48V, full load
Vin=36V, full load
Input to output, continuous
A
A
A2-Sec.
mA
mA
mA
mA, RMS
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
Calculated MTBF
%
%
Vdc
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic load di/dt
Dynamic Load Peak Deviation
180
±30
FEATURES and OPTIONS
Remote On/Off Control
➃
"N" suffix
Negative Logic, ON state
Negative Logic, OFF state
Control Current
"P" suffix
Positive Logic, ON state
Positive Logic, OFF state
Control Current
ON = Ground pin or external voltage
OFF = Pin open or external voltage
-0.7
10
1
ON = Pin open or external voltage
OFF = Ground pin or external voltage
10
-0.7
1
15
1.2
1.2
15
V
V
mA
V
V
mA
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MDC_UEI25W.B07
Page 3 of 24
UEI25 Series
Single Output Isolated 25-Watt DC/DC Converters
FUNCTIONAL SPECIFICATIONS (CONT.) – MODEL UEI25-033-D48
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
Output Current Range
Minimum Load
➂
Current Limit Inception
Short Circuit
Short Circuit Current
Short Circuit Duration (remove short for
recovery)
Short circuit protection method
Regulation
➄
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading (10% ceramic,
90% Oscon)
Conditions
➀ ➂
See Derating
No trim
At 50% load
User-adjustable
Via magnetic feedback
Minimum
0.0
3.267
-1
-10
4.2
0.7575
Typical/Nominal
25.0
3.30
Maximum
25.25
3.333
+1
+10
5.7
7.575
11
0.3
Units
W
Vdc
% of Vset.
% of Vnom.
Vdc
A
% of Iout
A
A
5
7.575
10% minimum load
10
98% of Vnom., after warmup
Hiccup technique, autorecovery
Output shorted to ground, no damage
Current limiting
Vin=min. to max., Vout=nom., 50% load
Iout=min. to max., Vin=48V
5 Hz- 20 MHz BW
At all outputs
Cap. ESR=<0.02Ω, full resistive load
8.5
Continuous
50
0.02
0
±0.1
±0.2
80
2000
% of Vout
% of Vout
mV pk-pk
% of Vnom./°C
μF
MECHANICAL (Through Hole Models)
Outline Dimensions (no baseplate)
(Please refer to outline drawing)
Weight
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Conditions
➀
C75 case
WxLxH
Minimum
Typical/Nominal
0.9x1.1x0.32
22.86x27.9x8.1
0.32
9.07
0.04
1.016
Copper alloy
50
5
Maximum
Units
Inches
mm
Ounces
Grams
Inches
mm
μ-inches
μ-inches
Nickel subplate
Gold overplate
With derating, 200 LFM
No derating, 200 LFM
Vin = Zero (no power)
Measured in center
External filter is required
-40
-40
-55
110
ENVIRONMENTAL
Operating Ambient Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
Relative humidity, non-condensing
Altitude
RoHS rating
85
70
125
120
°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
Notes
➀
Unless otherwise noted, all specifications are at nominal input voltage, nominal out-
put 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 ex-
ternal input capacitor is 4.7 μF ceramic. All capacitors are low-ESR types wired close
to the converter. These capacitors are necessary for our test equipment 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 Cbus=220 μF, Cin=33 μF and Lbus=12 μH.
➂
All models are stable and regulate to specification under minimum (10%) load.
Operation under no load will not damage the converter but may increase regulation,
output ripple, and noise.
➃
The Remote On/Off Control is referred to -Vin.
➄
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_UEI25W.B07
Page 4 of 24
UEI25 Series
Single Output Isolated 25-Watt DC/DC Converters
FUNCTIONAL SPECIFICATIONS – MODEL UEI25-050-D48
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Conditions
➀
Full power operation
Operating or non-operating, 100 mS max.
duration
Input to output
None, install external fuse
Power on or off, referred to -Vin
Minimum
0
0
Typical/Nominal
Maximum
80
100
Units
Vdc
Vdc
Isolation Voltage
2250
Vdc
Input Reverse Polarity
None
Vdc
On/Off Remote Control
0
15
Vdc
Output Power
0
25.25
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.
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