DC/DC Converter
VRA_LD-20WR3 & VRB_LD-20WR3 Series
2019.10.30-A/6 Page 1 of 7
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
20W isolated DC-DC converter
Wide input and regulated dual / single output
Patent Protection RoHS
FEATURES
Wide 2:1 input voltage range
High efficiency up to 90%
No-load power consumption as low as 0.15W
I/O isolation test voltage 1.5k VDC
Output short-circuit, over-voltage, over-current
protection
Operating ambient temperature range：-40℃
to +85℃
Meets CISPR32/EN55032 CLASS A, without extra
components
Six-sided metal shielded package
EN60950 approved
VRA_LD-20WR3 & VRB_LD-20WR3 series of isolated 20W DC-DC converter products with a 2:1 input voltage range. They feature efficiencies
of up to 90%, 1500VDC input to output isolation, operating ambient temperature range of -40℃to +85℃, output short-circuit, over-voltage,
over-current protection. They meet CLASS A of CISPR32/EN55032 EMI standards without external components and they are widely used in
applications such as data transmission device, battery power supplies, tele-comunication device, distributed power supply system, hybrid
module system, remote control system, industrial robot system fields.
Selection Guide
Certification
Part No.
Input Voltage (VDC)
Output
Full Load
Efficiency②(%)
Min./Typ.
Nominal
(Range)
Max. ①
Voltage (VDC)
Current(mA)
Max./Min.
--
VRA1215LD-20WR3
12
(9-18)
20
±15
±667/0
85/87
VRA1224LD-20WR3
±24
±417/0
86/88
VRB121DLD-20WR3
110
182/9
86/88
CE
VRA2405LD-20WR3
24
(18-36)
40
±5
±2000/0
82/84
VRA2409LD-20WR3
±9
±1111/0
84/86
VRA2412LD-20WR3
±12
±834/0
84/86
VRA2415LD-20WR3
±15
±667/0
84/86
--
VRA2424LD-20WR3
±24
±417/0
84/86
CE
VRB2403LD-20WR3
3.3
5000/0
84/86
VRB2405LD-20WR3
5
4000/0
88/90
VRB2409LD-20WR3
9
2222/0
85/87
VRB2412LD-20WR3
12
1667/0
85/87
VRB2415LD-20WR3
15
1333/0
86/88
VRB2424LD-20WR3
24
834/0
86/88
VRA4805LD-20WR3
48
(36-75)
80
±5
±2000/0
84/86
VRA4812LD-20WR3
±12
±834/0
86/88
VRA4815LD-20WR3
±15
±667/0
87/89
VRB4803LD-20WR3
3.3
5000/0
84/86
VRB4805LD-20WR3
5
4000/0
88/90
VRB4809LD-20WR3
9
2222/0
87/89
VRB4812LD-20WR3
12
1667/0
87/89
VRB4815LD-20WR3
15
1333/0
88/90
VRB4824LD-20WR3
24
834/0
88/90
Notes：①Exceeding the maximum input voltage may cause permanent damage;
②Efficiency is measured In nominal input voltage and rated output load;
③The specified maximum capacitive load value for positive and negative output is identical.
DC/DC Converter
VRA_LD-20WR3 & VRB_LD-20WR3 Series
2019.10.30-A/6 Page 2 of 7
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
Input Specifications
Item
Operating Conditions
Min.
Typ.
Max.
Unit
Input Current (full load / no-load)
12VDC input
±15V output
--
1916/12
1960/20
mA
±24V output
--
1894/15
1938/25
Others
--
1894/35
1938/--
24VDC input
3.3V output
--
799/40
818/45
5V output
--
969/40
993/45
Others
--
947/6
969/10
48VDC input
3.3V output
--
400/20
409/25
5V output
--
485/20
497/25
Others
--
474/5
485/9
Reflected Ripple Current
12VDC input
110V output
--
20
--
others
--
30
--
24VDC / 48VDC input
--
30
--
Surge Voltage (1sec. max.)
12VDC input
-0.7
--
25
VDC
24VDC input
-0.7
--
50
48VDC input
-0.7
--
100
Start-up Voltage
12VDC input
--
--
9
24VDC input
--
--
18
48VDC input
--
--
36
Start-up Time
Nominal input voltage & constant resistance load
--
10
--
ms
Input Filter
Pi filter
Ctrl ①
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
VRB121DLD-20WR3
--
5
--
mA
Others
--
4
7
Hot Plug
Unavailable
Note: ①The Ctrl pin voltage is referenced to input GND.
Output Specifications
Item
Operating Conditions
Min.
Typ.
Max.
Unit
Voltage Accuracy①
5%-100% load
VRA1215LD-20WR3
--
±1
±3
%
0%-100% load
VRA1224LD-20
WR3
Positive output
--
±1
±3
Negative output
--
±2
±4
Others
--
±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
VRA1215LD-20
WR3/VRA1224L
D-20WR3
Positive output
--
±0.5
±1
Negative output
--
±1
±1.5
Others
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/±5VDC
output
--
±5
±8
%
Others
--
±3
±5
Temperature Coefficient
Full load
--
--
±0.03
%/℃
Ripple & Noise③
20MHz bandwidth, 5%-100% load
VRB121DLD-20W
R3
--
--
250
mVp-p
Others
--
50
100
Trim
Input voltage range(24V/48V input series)
--
±10
--
%Vo
DC/DC Converter
VRA_LD-20WR3 & VRB_LD-20WR3 Series
2019.10.30-A/6 Page 3 of 7
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Over-voltage Protection
Input voltage range(24V/48V input series and
VRA1215LD-20WR3/VRA1224LD-20WR3)
110
--
160
Over-current Protection
Input voltage range
VRB121DLD-20W
R3
--
130
--
%Io
Others
110
--
190
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%;
③The “parallel cable” method is used for Ripple and Noise test, please refer to DC-DC Converter Application Notes for specific information. Ripple & Noise at
＜5% load is 5%Vo. Max.
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
VRB2424LD-20WR3
--
2050
--
pF
VRB121DLD-20WR3
--
2000
--
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
℃
Max. Case Temperature
Refer to temperature derating curve (VRB121DLD-20WR3)
--
--
105
Vibration
10-150Hz, 5G, 90 Min. along X, Y and Z
Switching Frequency ①
PWM mode
VRB121DLD-20WR3
--
300
--
KHz
Others
--
270
--
MTBF
MIL-HDBK-217F@25℃
1000
--
--
K hours
Note: ①Switching 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
50.80 × 25.40 × 11.80 mm
Weight
26.0g(Typ.)
Cooling Method
Free air convection
Electromagnetic Compatibility (EMC)
Emissions
CE
CISPR32/EN55032 CLASS A (without extra components)/ CLASS B (see Fig.3-①for
recommended circuit)
RE
CISPR32/EN55032 CLASS A (without extra components)/ CLASS B (see Fig.3-①for
recommended circuit)
(except VRB121DLD-20WR3)
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.3-②for recommended circuit)
perf. Criteria B
Surge
IEC/EN61000-4-5 line to line ±2KV (see Fig.3-②for 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
DC/DC Converter
VRA_LD-20WR3 & VRB_LD-20WR3 Series
2019.10.30-A/6 Page 4 of 7
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
Typical Characteristic Curves
VRB121DLD-20WR3
VRA1215LD-20WR3
Others
Fig. 1
DC/DC Converter
VRA_LD-20WR3 & VRB_LD-20WR3 Series
2019.10.30-A/6 Page 5 of 7
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
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
±24
100
110
--
2. EMC compliance circuit
Single:
Dual:
Fig. 3
Notes: For EMC tests we use Part ①in Fig. 3 for emissions and part ②for
immunity test.
Parameter description
Model
Vin:12V/24V
Vin:48V
FUSE
Choose according to actual input current
C0
680µF/100V
680µF/100V
C1
1µF/50V
1µF/100V
C2
330µF/50V
330µF/100V
C3 / C4
Refer to the Cout in Fig.2
LDM1
4.7µH
CY1/ CY2
1nF/2KV
DC/DC Converter
VRA_LD-20WR3 & VRB_LD-20WR3 Series
2019.10.30-A/6 Page 6 of 7
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
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.
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
110
130.43
3.00
22
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
DC/DC Converter
VRA_LD-20WR3 & VRB_LD-20WR3 Series
2019.10.30-A/6 Page 7 of 7
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
Horizontal Package Dimensions and Recommended Layout
Note:
Unit :mm[inch]
Pin diameter tolerances :±0.10[±0.004]
General tolerances:±0.50[±0.020]
Note：Grid 2.54*2.54mm
1102000904-B0
∅1.50 [∅0.059]
6
1
2
5
4
3
Single
GND
Vin
+Vo
Trim
0V
Pin
1
2
3
4
5
Pin-Out
Dual
GND
Vin
+Vo
0V
-Vo
Ctrl6 Ctrl
50.80 [2.000]
25.40 [1.000] 4.10 [0.161]
20.32 [0.800]
∅1.00 [0.039]
20.32 [0.800]
Front View
Bottom View
1
2
6
3
4
5
11.80 [0.465]
5.08 [0.200]7.62 [0.300]
THIRD ANGLE PROJECTION
Notes:
1. For additional information on Product Packaging please refer to www.mornsun-power.com.The Packaging bag number of Horizontal
package: 58200035;
2. We suggest to use module at load of over 5%, if not, the ripple of the product may exceeds the specification, but does not affect the
reliability of the product;
3. The maximum capacitive load offered were tested at input voltage range and full load;
4. 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;
5. All index testing methods in this datasheet are based on company corporate standards;
6. We can provide product customization service, please contact our technicians directly for specific information;
7. Products are related to laws and regulations: see "Features" and "EMC";
8. 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