Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232
WPN20
20W Regulated DC/DC Converter
KDC_WPN20RC.E01 Page 1 of 5
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For full details go to
www.murata-ps.com/rohs
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SELECTION GUIDE
Order Code
Input Voltage Output
Voltage
Output Current Input Current Efficiency Recommeneded
Alternative
Nom. Min. Nom. Nom. Load
VVAAA%
WPN20R48S05C
Obsolete, recommended alternative:
(click to view data sheets)
UWR-5/4000-D48A-C
WPN20R12S05C UWR-5/4000-D12A-C
WPN20R12S12C UWR-12/1650-D12A-C
WPN20R12D12C BWR-12/830-D12A-C
WPN20R24S03C UWR-3.3/4850-D12A-C
WPN20R24S05C UWR-5/4000-D12A-C
WPN20R24S12C UWR-12/1650-D12A-C
WPN20R24D12C BWR-12/830-D12A-C
WPN20R24D15C BWR-15/670-D12A-C
WPN20R48S12C UWR-12/1650-D48A-C
WPN20R48D12C BWR-12/830-D48A-C
WPN20R48D15C BWR-15/670-D48A-C
INPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Voltage range
All WPN20R12 types 9 12 18
V
All WPN20R24 types 18 24 36
All WPN20R48 types 33 48 75
Reflected ripple current 50 mA p-p
Undervoltage lockout
threshold
All WPN20R12 types 7 8.8
V
All WPN20R24 types 15.5 17
All WPN20R48 types 30 33
OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Rated power 20 W
Voltage setpoint accuracy ±1.5 %
Temperature coefficient ±0.005 %/ºC
Line regulation High line to low line Singles ±0.1 %
Duals ±0.5 %
Load regulation Min load to
Nom. load
Singles ±0.5 %
Duals ±2.0 %
Ripple & Noise Single outputs, BW = 5Hz to 20MHz 60 100 mVp-p
Dual outputs, BW = 5Hz to 20MHz 50 100 mVp-p
Output voltage adjust range See attached plots
Short circuit &
overcurrent protection Continuous
GENERAL CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Switching frequency 300 kHz
Max capacitive load 550 mF/A
MTTF per ML-HDBK-217
Ground benign
Circuit stress method
TA = +25º unmodified database 1.4 MHr
FEATURES
RoHS compliant
Operating temperature range: -40ºC to
+100ºC
Industry standard pinout
Input and output filtering
Low profile shell
Single and dual outputs
Output trim function
DESCRIPTION
The WPN20RC series is available in three input
voltage ranges of 9-18V, 18-36V and 33-75V. The
unit is housed in a space saving aluminum shell.
The 300KHz switching frequency and forward
converter topology provide excellent performance
across all line and load conditions. Other features
include: under voltage lock-out, internal tem-
perature shutdown, soft start and over current
protection.
An output trim feature is provided, allowing the
user to compensate for long line lengths.
Applications include: Telecommunications, Battery
Powered Sytems, Process Control Equipment,
Transportation Equipment and Distributed Power
Systems.
The product range has been recognised by Under-
writers Laboratory (UL) to UL 1950 for operational
insulation, file number E179522 applies.
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
0W
OBSOLETE
OBSOLETE
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WPN20
20W Regulated DC/DC Converter
KDC_WPN20RC.E01 Page 2 of 5
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THERMAL DERATING CURVE
ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Rated voltage 1500 Vpk
Test voltage 60Hz, 10 seconds 1500 Vpk
Resistance 10 GΩ
Capacitance 2400 pF
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Specification Ambient (with no derating) -40 +85 °C
Operation Case (with no derating) -40 +100 °C
Storage -55 +125 °C
Thermal shutdown Case 105 115 °C
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260ºC
for 10 seconds. The pin termination finish on this product series is matte tin (100 microns min.) over
nickel (40-80 microinches min.). The series is backward compatible with Sn/Pb soldering systems.
For further information, please visit www.murata-ps.com/rohs
TECHNICAL NOTES
ISOLATION VOLTAGE
‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test voltage,
applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
Murata Power Solutions WPN20 series of dc/dc converters are all 100% production tested at their stated isolation voltage. This is 1500 Vpk for 10 seconds.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The WPN20 series has been recognized by Underwriters Laboratory, both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or 60VDC.
The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part could be
expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides of the barrier must be regarded
as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry according to safety standard
requirements.
REPEATED HIGH-VOLTAGE ISOLATION TESTING
It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materi-
als, construction and environment. While manufactured parts can withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any
material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of
tests should be strictly limited. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from
specified test voltage.
Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232
WPN20
20W Regulated DC/DC Converter
KDC_WPN20RC.E01 Page 3 of 5
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APPLICATION NOTES
OUTPUT VOLTAGE ADJUSTMENT
VNOM 3.3V 5V 12V 15V
G27604 8250 235050 362450
H7500 1100 17800 2200
K9280 2200 21700 26990
*Note: For 3.3V outputs, VNOM is 3.327V and for 15V outputs VNOM is 14.967V.
TRIM UP SINGLE TRIM DOWN SINGLE
TRIM UP DUAL TRIM DOWN DUAL
When the output voltage is trimmed up, output current must be derated so that the maximum output power (shown in the selection table) is not
exceeded.
FUSING
The WPN20R Series of converters are not internally fused. In order to maintain maximum safety an input line fuse should always be included. A slow blow, UL listed, 8A fuse
is recommended for all models.
Remote on/off
The WPN20R Series of converters are equipped with a primary on/off control pin for increased system flexibility. The input is TTL open-collector and/or CMOS open-drain
compatible. The primary on/off pin uses positive logic, which turns the unit off when a logic low signal is applied (<0.7V). The figure below illustrates the typical external
connections to enable this function. If no connection is made to the primary on/off control pin, the module will operate normally.
RDOWN = G - (VOUT x H)
V
OUT - VNOM*
RUP = G - (VOUT x K)
V
OUT - VNOM*
The trim resistor equations are: Where:
+VIN +VOUT
-VOUT
TRIM
RUP
WPN20
+VIN +VOUT
-VOUT
TRIM
RDOWN
WPN20
+VIN +VOUT
Common
TRIM
RUP
+VIN +VOUT
TRIM
RDOWN
-VOUT
Common
-VOUT
WPN20WPN20
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WPN20
20W Regulated DC/DC Converter
KDC_WPN20RC.E01 Page 4 of 5
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PERFORMANCE GRAPHS
(I¿FLHQF\
15V
12V
5V
3V
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1RUPDOL]HG2XWSXW5LSSOH
-40 -15 25 65 110
7FDVH&
75,05(6,67259628738792/7$*(&+$1*(
50
45
40
35
30
25
20
15
10
5
0
10 9 8 7 6 5 4 3 2 1
3HUFHQWDJH&KDQJH,Q2XWSXW9ROWDJH
7ULP5HVLVWRU.2KPV
5 5
3 -trim +trim
-40 -15 25 65 110
100% Load
20% Load
7FDVH&
&KDQJHLQ(I¿FLHQF\
-10
-5
0
5
10
Change in Eciency (%)
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
Vin
()),&,(1&<96,138792/7$*(
LL Nom HL
50%Load
10%Load
100%Load
3HUFHQWDJH&KDQJH,Q2XWSXW9ROWDJH
100
90
80
70
60
50
40
30
20
10
010 9 8 7 6 5 4 3 2 1
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7ULP5HVLVWRU.2KPV
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90
85
80
75
70
65
60
55
50 10 20 40 50 60 80 100
2XWSXW/RDGRU5DWHG
1.4
1.2
1
0.8
0.6
0.4
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1RUPDOL]HG2XWSXW5LSSOH
Vin
LL Nom HL
12 15 15
+trim -trim trim
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1
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81/
20W Regulated DC/DC Converter
KDC_WPN20RC.E01 Page 5 of 5
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. © 2012 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
www.murata-ps.com/locations
MECHANICAL DIMENSTIONS
Weight: 32g
All pins on a 0.1 (2.54) pitch and within ±0.01 (0.25) of true position.
Unless otherwise stated all dimensions are in inches (mm) ±0.01 (0.25).
PIN SIDE DOWN
PIN SIDE UP
WPN20RxxyzzC
1.590 ± 0.005
(40.39 ± 0.13)
1.990 ± 0.005
(50.55 ± 0.13)
0.425 ± 0.00
(10.80 ± 0.08)
0.150
(3.81)
0.040 ± 0.002
(1.02 ± 0.05)
0.015 ± 0.003
(0.38 ± 0.08)
1
4
2
5
6
7
8
SIDE VIEW
PIN CONNECTIONS
Pin Function
Singles Duals
1+VIN +VIN
2-VIN -VIN
4 Remote on/off Remote on/off
5 NO PIN +VOUT
6+VOUT OV
7-V
OUT -VOUT
8 TRIM TRIM
