DC/DC Converter
URA_LD-20WR3 & URB_LD-20WR3 Series
2019.11.14-B/5 Page 1 of 9
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20W isolated DC-DC converter
Ultra-wide input and regulated dual / single output
CB Patent Protection RoHS
FEATURES
Ultra-wide 4:1 input voltage range
High efficiency up to 90%
No-load power consumption as low as 0.15W
I/O isolation test voltage1.5k VDC
Input under-voltage protection, output
short-circuit, over-voltage, over-current
protection
Operating ambient temperature range: -40℃
to +85℃
CISPR32/EN55032 CLASS A EMI compliant
without external components
Six-sided metal shielded package
Input reverse polarity protection available with
Chassis (A2S) or 35mm DIN-Rail mounting (A4S)
version
IEC60950, UL60950, EN60950 approved
Meets EN50155 railway standard
URA_LD-20WR3 & URB_LD-20WR3 series of isolated 20W DC-DC products with a 4:1 input voltage range. They feature efficiencies of up to
90%, 1500VDC input to output isolation, operating ambient temperature range of -40℃to +85℃, input under-voltage protection, output
short-circuit, over-voltage, over-current protection. They meet CLASS A of CISPR32/EN55032 EMI standards without external components,
optional packages are offered for chassis or DIN-rail mounting (A2S, A4S), adding additional input reverse polarity protection and they are
widely used in applications such as data transmission device, battery power supplies, telecommunication device, distributed power supply
system, hybrid module system, remote control system, industrial robot system and railway fields.
Selection Guide
Certification
Part No. ①
Input Voltage (VDC)
Output
Full Load
Efficiency③(%)
Min./Typ.
Nominal
(Range)
Max. ②
Voltage (VDC)
Current (mA)
Max./Min.
UL/CE/CB
URA2405LD-20WR3
24
(9-36)
40
±5
±2000/0
84/86
URA2409LD-20WR3
±9
±1111/0
86/88
URA2412LD-20WR3
±12
±834/0
86/88
URA2415LD-20WR3
±15
±667/0
86/88
URB2403LD-20WR3
3.3
5000/0
84/86
URB2405LD-20WR3
5
4000/0
86/88
URB2409LD-20WR3
9
2222/0
87/89
URB2412LD-20WR3
12
1667/0
87/89
URB2415LD-20WR3
15
1333/0
88/90
URB2424LD-20WR3
24
834/0
88/90
URA4805LD-20WR3
48
(18-75)
80
±5
±2000/0
84/86
URA4812LD-20WR3
±12
±834/0
86/88
URA4815LD-20WR3
±15
±667/0
87/89
URB4803LD-20WR3
3.3
5000/0
84/86
URB4805LD-20WR3
5
4000/0
84/86
URB4809LD-20WR3
9
2222/0
87/89
URB4812LD-20WR3
12
1667/0
85/87
URB4815LD-20WR3
15
1333/0
88/90
URB4824LD-20WR3
24
834/0
86/88
Notes：
①Use “H” suffix for heat sink mounting, “A2S” suffix for chassis mounting and “A4S” suffix for DIN-Rail mounting. We recommend to choose modules with a heat
sink for enhanced heat dissipation and applications with extreme temperature requirements;
②Exceeding the maximum input voltage may cause permanent damage;
DC/DC Converter
URA_LD-20WR3 & URB_LD-20WR3 Series
2019.11.14-B/5 Page 2 of 9
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③Efficiency is measured at nominal input voltage and rated output load; efficiencies for A2S and A4S Model’s is decreased by 2% due to the input reverse
polarity protection circuit;
④The capacitive loads of positive and negative outputs are identical.
Input Specifications
Item
Operating Conditions
Min.
Typ.
Max.
Unit
Input Current (full load / no-load)
24VDC input
3.3V output
--
799/40
818/45
mA
5V output
--
969/40
993/80
Others
--
947/6
969/10
48VDC input
3.3V output
--
400/20
409/25
5V output
--
485/20
497/60
Others
--
474/5
485/9
Reflected Ripple Current
24VDC input
--
30
--
48VDC input
--
30
--
Surge Voltage (1sec. max.)
24VDC input
-0.7
--
50
VDC
48VDC input
-0.7
--
100
Start-up Voltage
24VDC input
--
--
9
48VDC input
--
--
18
Under-Voltage Shutdown
24VDC input
5.5
6.5
--
48VDC input
12
15.5
--
Start-up Time
Nominal input & constant resistance load
--
10
--
ms
Input Filter
Pi filter
Ctrl *
Module on
Ctrl pin open or pulled high (3.5-12VDC)
Module off
Ctrl pin pulled low to GND (0-1.2VDC)
Input current when off
--
4
7
mA
Hot Plug
Unavailable
Note: *The Ctrl pin voltage is referenced to input GND.
Output Specifications
Item
Operating Conditions
Min.
Typ.
Max.
Unit
Voltage Accuracy①
0%-100% load
--
±1
±3
%
Linear Regulation
Input voltage variation from low to
high at full load
Positive Output
--
±0.2
±0.5
Negative Output
--
±0.5
±1
Load Regulation②
5%-100% load
Positive Output
--
±0.5
±1
Negative Output
--
±0.5
±1.5
Cross Regulation
Dual output with Positive output at 50% load and
Negative output from 10%-100% load
--
--
±5
Transient Recovery Time
25% load step change,
nominal input voltage
--
300
500
µs
Transient Response Deviation
3.3V/5V/±5V output
--
±5
±8
%
Others
--
±3
±5
Temperature Coefficient
Full load
--
--
±0.03
%/℃
Ripple & Noise③
20MHz bandwidth, 5%-100% load
--
50
100
Mv p-p
Trim
Input voltage range
--
±10
--
%Vo
Over-voltage Protection
110
--
160
Over-current Protection
110
--
190
%Io
Short-- circuit Protection
Hiccup, continuous, self-recovery
Note:
①Output voltage accuracy of ±5VDC/±9VDC output converter for 0%-5% load is ±5% max;
②Load regulation for 0%-100% load is ±5%;
③Ripple & Noise at ≤5% load is 5%Vo. Max. The “parallel cable” method is used for Ripple and Noise test, please refer to DC-DC Converter Application Notes
for specific information.
DC/DC Converter
URA_LD-20WR3 & URB_LD-20WR3 Series
2019.11.14-B/5 Page 3 of 9
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General Specifications
Item
Operating Conditions
Min.
Typ.
Max.
Unit
Isolation
Input-output Electric Strength test for 1 minute with a
leakage current of 1mA max.
1500
--
--
VDC
Insulation Resistance
Input-output resistance at 500VDC
1000
--
--
MΩ
Isolation Capacitance
Input-output capacitance at
100KHz/0.1V
URB2424LD-20WR3
--
2050
--
pF
Others
--
1050
--
Operating Temperature
See Fig. 1
-40
--
+85
℃
Storage Temperature
-55
--
+125
Storage Humidity
Non-condensing
5
--
95
%RH
Pin Soldering Resistance
Temperature
Soldering spot is 1.5mm away from case for 10 seconds
--
--
300
℃
Vibration
IEC/EN61373 - Category 1, Grade B
Switching Frequency*
PWM mode
--
270
--
KHz
MTBF
MIL-HDBK-217F@25℃
1000
--
--
K hours
Note:*Switching frequency is measured at full load. The module reduces the switching frequency for light load (below 50%) efficiency improvement.
Mechanical Specifications
Case Material
Aluminum alloy
Dimensions
Horizontal package (without heat sink)
50.80 × 25.40 × 11.80 mm
Horizontal package (with heat sink)
51.40 × 26.20 × 16.50mm
A2S chassis mounting (without heat sink)
76.00 × 31.50 × 21.20 mm
A2S chassis mounting (with heat sink)
76.00 × 31.50 × 25.30 mm
A4S Din-rail mounting (without heat sink)
76.00 × 31.50 × 25.80 mm
A4S Din-rail mounting (with heat sink)
76.00 × 31.50 × 29.90 mm
Weight
Without heat sink
Horizontal package/A2S chassis mounting/A4S Din-rail mounting
25.0g/48.0g/68.0g(Typ.)
With heat sink
Horizontal package/A2S chassis mounting/A4S Din-rail mounting
34.0g/56.0g/76.0g(Typ.)
Cooling Method
Free air convection
Electromagnetic Compatibility (EMC)
Emissions
CE
CISPR32/EN55032
CLASS A (without external components)/ CLASS B (see Fig.3-②for
recommended circuit)
RE
CISPR32/EN55032
CLASS A (without external components)/ CLASS B (see Fig.3-②for
recommended circuit)
Immunity
ESD
IEC/EN61000-4-2 Contact ±4KV
perf. Criteria B
RS
IEC/EN61000-4-3 10V/m
perf. Criteria A
EFT
IEC/EN61000-4-4 ±2KV (see Fig.3-①for recommended circuit)
perf. Criteria B
Surge
IEC/EN61000-4-5 line to line ±2KV (see Fig.3-①for recommended circuit)
perf. Criteria B
CS
IEC/EN61000-4-6 3 Vr.m.s
perf. Criteria A
Voltage dips, short
interruptions and voltage
variations immunity
IEC/EN61000-4-29 0%, 70%
perf. Criteria B
Electromagnetic Compatibility (EMC) (EN50155)
Emissions
CE
EN50121-3-2 150kHz-500kHz 99dBuV (see Fig.3-②for recommended circuit)
EN55016-2-1 500kHz-30MHz 93dBuV (see Fig.3-②for recommended circuit)
RE
EN50121-3-2 30MHz-230MHz 40dBuV/m at 10m (see Fig.3-②for recommended circuit)
EN55016-2-1 230MHz-1GHz 47dBuV/m at 10m (see Fig.3-②for recommended circuit)
Immunity
ESD
EN50121-3-2 Contact ±6KV/Air ±8KV
perf. Criteria A
RS
EN50121-3-2 20V/m
perf. Criteria A
EFT
EN50121-3-2 ±2kV 5/50ns 5kHz (see Fig.3-①for recommended circuit)
perf. Criteria A
Surge
EN50121-3-2 line to line ±1KV (42Ω, 0.5μF) (see Fig.3-①for recommended
circuit)
perf. Criteria A
DC/DC Converter
URA_LD-20WR3 & URB_LD-20WR3 Series
2019.11.14-B/5 Page 4 of 9
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Immunity
CS
EN50121-3-2 0.15MHz-80MHz 10V r.m.s
perf. Criteria A
Typical Characteristic Curves
Operating Temperatur e( )
℃
Temperatur e Der atin g Curve
Ou tpu t Power Percentage(%)
-40 0 40 71 85 120
80
60
100
120
40
20
0
Safe Operatin g Area
75
wi th hea ts ink
wi thout heats ink
Fig. 1
DC/DC Converter
URA_LD-20WR3 & URB_LD-20WR3 Series
2019.11.14-B/5 Page 5 of 9
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Design Reference
1. Typical application
All the DC/DC converters of this series are tested before delivery using the recommended circuit shown in Fig. 2.
Input and/or output ripple can be further reduced by appropriately increasing the input & output capacitor values Cin and Cout and/or by
selecting capacitors with a low ESR (equivalent series resistance). Also make sure that the capacitance is not exceeding the specified max.
capacitive load value of the product.
DC DC
Vin
GND
+Vo
0V
Cin
Cout
Vin
GND
+Vo
0V
Cin
Cout
DC DC
-Vo
Cout
Dual
Single
Fig. 2
Single Vout
(VDC)
Cout
(µF)
Cin
(µF)
Dual Vout
(VDC)
Cout
(µF)
Cin
(µF)
3.3/5
470
100
±5
220
100
9/12/15
220
±9/±12/±15
100
24
100
--
--
2. EMC compliance circuit
Dual
Single
Fig. 3
Notes: Part ①in the Fig. 3 is used for EMC test and part ②for EMI test
Parameter description
Model
Vin:24V
Vin:48V
FUSE
Choose according to actual input current
C0, C3
330µF/50V
330µF/100V
C1
1µF/50V
1µF/100V
C2
Refer to the Cout in Fig.2
LDM1
4.7µH/3.1A
CY1, CY2
1nF/2KV
3. Trim Function for Output Voltage Adjustment (open if unused)
0V
R2
R1
R3
Vref
RT
Trim
Vo’
0V
R2
R1
R3
Vref
RT
Trim
Vo’
Trim up Trim down
TRIM resistor connection (dashed line shows internal resistor network)
Calculating Trim resistor values:
up: a= Vref
Vo’-Vref R1
R =TaR2
R -a2-R3
down: a= Vref
Vo’-Vref R2
R =TaR1
R -a1-R3
RT= Trim Resistor value;
a= self-defined parameter.
DC/DC Converter
URA_LD-20WR3 & URB_LD-20WR3 Series
2019.11.14-B/5 Page 6 of 9
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Vout(V)
R1(KΩ)
R2(KΩ)
R3(KΩ)
Vref(V)
3.3
4.801
2.87
12.4
1.24
5
2.883
2.87
10
2.5
9
7.500
2.87
15
2.5
12
11.000
2.87
15
2.5
15
14.494
2.87
15
2.5
24
24.872
2.87
17.8
2.5
4. The products do not support parallel connection of their output
5. For additional information please refer to DC-DC converter application notes on
www.mornsun-power.com
Horizontal Package (without heat sink) Dimensions and Recommended Layout
DC/DC Converter
URA_LD-20WR3 & URB_LD-20WR3 Series
2019.11.14-B/5 Page 7 of 9
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Horizontal Package (with heat sink) Dimensions
URA_LD-20WR3A2S & URB_LD-20WR3A2S(without heat sink) Dimensions
DC/DC Converter
URA_LD-20WR3 & URB_LD-20WR3 Series
2019.11.14-B/5 Page 8 of 9
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URA_LD-20WHR3A2S & URB_LD-20WHR3A2S(with heat sink) Dimensions
URA_LD-20WR3A4S & URB_LD-20WR3A4S(without heat sink) Dimensions
DC/DC Converter
URA_LD-20WR3 & URB_LD-20WR3 Series
2019.11.14-B/5 Page 9 of 9
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URA_LD-20WHR3A4S & URB_LD-20WHR3A4S(with heat sink) Dimensions
Notes:
1. For additional information on Product Packaging please refer to www.mornsun-power.com.The Packaging bag number of Horizontal
packaging: 58200035(without heat sink), 58200051(with heat sink), A2S/ A4S packaging number: 58220022;
2. The maximum capacitive load offered were tested at input voltage range and full load;
3. Unless otherwise specified, parameters in this datasheet were measured under the conditions of Ta=25℃, humidity<75%RH with nominal
input voltage and rated output load;
4. All index testing methods in this datasheet are based on company corporate standards;
5. We can provide product customization service, please contact our technicians directly for specific information;
6. Products are related to laws and regulations: see "Features" and "EMC";
7. Our products shall be classified according to ISO14001 and related environmental laws and regulations, and shall be handled by
qualified units.
Mornsun Guangzhou Science & Technology Co., Ltd.
Address: No. 5, Kehui St. 1, Kehui Development Center, Science Ave., Guangzhou Science City, Huangpu District, Guangzhou, P. R. China
Tel: 86-20-38601850 Fax: 86-20-38601272 E-mail:info@mornsun.cn www.mornsun-power.com