URA_LD-20WR3 & URB_LD-20WR3 series are isolated 20W DC-DC products with 4:1 input voltage. They feature efficiency up to 90%, 1500VDC
isolation, operating temperature of -40℃~+85℃, Input under-voltage protection, output short circuit protection, over-voltage protection,
over-current protection and EMI meets CISPR22/EN55022 CLASS A, which make them widely applied in data transmission device, battery
power supplies, tele-comunication device, distributed power supply system, remote control system, industrial robot system fields. And
extension package A2S and A4S also enable them with reverse voltage protection.
Selection Guide
Input Voltage (VDC)
Certification
Part No.
①
Output
②
Nominal
(Range)
Max.
Output Voltage
(VDC)
±5
±9
±12
±15
3.3
5
9
12
15
24
±5
±12
±15
3.3
Output Current
(mA)(Max./Min.)
±2000/0
±1111/0
±834/0
±667/0
5000/0
4000/0
2222/0
1667/0
1333/0
834/0
±2000/0
±834/0
±667/0
5000/0
4000/0
2222/0
1667/0
1333/0
834/0
Efficiency
(%,Min./Typ.)
@ Full Load
84/86
86/88
86/88
86/88
84/86
88/90
87/89
87/89
88/90
88/90
84/86
86/88
87/89
84/86
88/90
87/89
87/89
88/90
88/90
③
Max. Capacitive
④
Load (µF)
4800
1000
800
625
10000
10000
4700
1600
1000
500
4800
800
625
10000
10000
4700
1600
1000
500
URA2405LD-20WR3
URA2409LD-20WR3
URA2412LD-20WR3
URA2415LD-20WR3
URB2403LD-20WR3
URB2405LD-20WR3
URB2409LD-20WR3
UL/CE/CB
URB2412LD-20WR3
URB2415LD-20WR3
URB2424LD-20WR3
URA4805LD-20WR3
URA4812LD-20WR3
URA4815LD-20WR3
URB4803LD-20WR3
URB4805LD-20WR3
--
UL/CE/CB
URB4809LD-20WR3
URB4812LD-20WR3
URB4815LD-20WR3
URB4824LD-20WR3
48
(18-75)
80
24
(9-36)
40
5
9
12
15
24
Notes：①Series with suffix “H” are heat sink mounting; series with suffix “A2S” are chassis mounting，with suffix “A4S” are DIN-Rail mounting, for example
URB2405LD-20WHR3A2S is chassis mounting of with heat sink,URB2405LD-20WR3A4S is DIN-Rail mounting of without heat sink; If the application has a
higher requirement for heat dissipation, you can choose modules with heat sink;
②Absolute
maximum rating without damage on the converter, but it isn't recommended;
③Efficiency
is measured In nominal input voltage and rated output load;A2S (wiring) and A4S (rail) Model due to input reverse polarity protection,
minimum efficiency greater than Min.-2 is qualified;
④
The capacitive loads of positive and negative outputs are identical.
2015.09.28-A/3
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MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
DC/DC Converter
URA_LD-20WR3 & URB_LD-20WR3 Series
Input Specifications
Item
Operating Conditions
3.3V output
24VDC input
Input Current (full load / no-load)
48VDC input
24VDC input
48VDC input
24VDC input
48VDC input
24VDC input
48VDC input
24VDC input
48VDC input
Nominal input& constant resistance load
Module switch on
Ctrl*
Hot Plug
Note: *The voltage of Ctrl pin is relative to input pin GND.
Min.
--
--
--
--
--
--
--
--
-0.7
-0.7
--
--
5.5
14.0
--
Typ.
799/40
969/40
948/6
400/20
485/20
474/5
30
30
--
--
--
--
6.5
15.5
10
Pi filter
Max.
818/45
993/45
941/10
409/25
497/25
485/9
--
--
50
100
9
18
--
--
--
Unit
5V output
Others
3.3V output
5V output
Others
mA
Reflected Ripple Current
Input impulse Voltage (1sec. max.)
Starting Voltage
Under Voltage Shutdown
Starting Time
Input Filter
VDC
ms
Ctrl suspended or connected to TTL high level (3.5-12VDC)
Ctrl pin connected to GND or low level (0-1.2VDC)
--
4
Unavailable
7
mA
Module switch off
Input current when switched off
Output Specifications
Item
Output Voltage Accuracy
①
Operating Conditions
0%-100% load
Dual output, balanced load
Positive Output
Full load, the input voltage is
from low voltage to high voltage Negative Output
5%-100% load
Positive Output
Negative Output
Min.
--
--
--
--
--
--
--
--
Typ.
±1
±0.5
±0.2
±0.5
±0.5
±0.5
--
300
±5
±3
--
50
±10
--
--
Max.
±3
±1.5
±0.5
±1
±1
±1.5
±5
500
±8
±5
±0.03
100
--
160
190
Unit
Balance of Output Voltage
Line Regulation
Load Regulation
②
Cross Regulation
Transient Recovery Time
Transient Response Deviation
Temperature Drift Coefficient
Ripple & Noise
Trim
Over-voltage Protection
Over-current Protection
Short circuit Protection
③
%
Dual output, main output 50% load,
Supplement output from 10% to 100% load
25% load step change
Full load
20MHz bandwidth, 5%-100% load
3.3V/5V/±5V output
Others
µs
%
%/℃
Mv p-p
%Vo
%Io
--
--
--
--
--
110
110
Input voltage range
Hiccup, Continuous, self-recovery
Note:①At 0%~5% load, the Max. output voltage accuracy of
±5VDC/±9VDC
output converter is
±5%.
②When
testing from 0% to100%load working conditions，load regulation index of
±5%；
③0%-5%
load ripple&Noise is no more than 5%Vo.Ripple and noise are measured by “parallel cable” method, please see DC-DC Converter Application
Notes for specific operation.
2015.09.28-A/3
Page 2 of 9
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
DC/DC Converter
URA_LD-20WR3 & URB_LD-20WR3 Series
General Specifications
Item
Insulation Voltage
Insulation Resistance
Isolation Capacitance
Operating Temperature
Storage Temperature
Storage Humidity
Pin Welding Resistance
Temperature
Vibration
Switching Frequency *
MTBF
PWM mode
MIL-HDBK-217F@25℃
--
1000
Non-condensing
Welding spot is 1.5mm away from the casing, 10
seconds
Operating Conditions
Input-output, with the test time of 1 minute and the
leak current lower than 1mA
Input-output, insulation voltage 500VDC
Input-output, 100KHz/0.1V
see Fig. 1
URB2424LD-20WR3
Others
Min.
1500
1000
--
--
-40
-55
5
--
Typ.
--
--
2050
1050
--
--
--
--
Max.
--
--
--
--
+85
+125
95
+300
Unit
VDC
MΩ
pF
℃
%RH
℃
10-55Hz, 10G, 30 Min. along X, Y and Z
270
--
--
--
KHz
K hours
Note:* This series of products using reduced frequency technology, the switching frequency is test value of full load,When the load is reduced to below 50%, the
switching frequency decreases with decreasing load.
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