DC/DC Converter
WRA_S-3WR2 & WRB_S-3WR2 Series
2017.08.17-B/1 Page 1 of 6
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
3W, Wide input voltage, isolated & regulated dual /
single output DC/DC converter
Patent Protection RoHS
FEATURES
Compact SIP package
Wide input voltage range (2:1)
Operating temperature range: -40℃to +85℃
Isolation voltage: 1.5K VDC
Low ripple & noise
Short circuit protection (self-recovery)
Remote On/Off
High power density
EN60950 approval
WRA_S-3WR2 & WRB_S-3WR2 series are isolated 3W DC-DC products with 2:1 input voltage and conventional voltage output. The product
has a relatively compact SIP-8 plastic package, and features high efficiency, operating temperature of -40℃to +85℃, remote control, and
continuous short-circuit protection. The smaller size and fine cost design make the converter an ideal solution in communication,
instruments, and industrial electronics applications.
Selection Guide
Certification
Part No.
Input Voltage (VDC)
Output
Efficiency
(%, Min./Typ.)
@ Full Load
Max.
Capacitive
Load②(µF)
Nominal
(Range)
Max.①
Output
Voltage(VDC)
Output Current
(mA)(Max./Min.)
CE
WRA0505S-3WR2
5
(4.5-9)
11
±5
±250/±13
72/74
1000
WRA0512S-3WR2
±12
±104/±5
75/77
470
WRA0515S-3WR2
±15
±83/±4
75/77
330
WRA0524S-3WR2
±24
±52/±3
74/76
220
WRB0503S-3WR2
3.3
758/38
66/68
1800
WRB0505S-3WR2
5
500/25
71/73
2200
WRB0509S-3WR2
9
278/14
72/74
1000
WRB0512S-3WR2
12
208/10
75/77
680
WRB0515S-3WR2
15
167/8
72/74
470
WRB0524S-3WR2
24
104/5
74/76
330
WRA1205S-3WR2
12
(9-18)
20
±5
±300/±15
76/78
1000
WRA1209S-3WR2
±9
±167/±8
76/78
680
WRA1212S-3WR2
±12
±125/±6
77/79
470
WRA1215S-3WR2
±15
±100/±5
78/80
330
WRB1203S-3WR2
3.3
758/38
73/75
2700
WRB1205S-3WR2
5
600/30
74/76
2200
WRB1206S-3WR2
6
500/25
77/79
1800
WRB1209S-3WR2
9
333/17
77/79
1000
WRB1212S-3WR2
12
250/13
80/82
680
WRB1215S-3WR2
15
200/10
81/83
470
WRB1224S-3WR2
24
125/6
79/81
330
WRA2405S-3WR2
24
(18-36)
40
±5
±300/±15
77/79
1000
WRA2409S-3WR2
±9
±167/±8
79/81
680
WRA2412S-3WR2
±12
±125/±6
81/83
470
WRA2415S-3WR2
±15
±100/±5
81/83
330
WRB2403S-3WR2
3.3
758/38
72/74
2700
WRB2405S-3WR2
5
600/30
79/81
2200
WRB2409S-3WR2
9
333/17
81/83
1000
WRB2412S-3WR2
12
250/13
81/83
680
WRB2415S-3WR2
15
200/10
81/83
470
WRB2424S-3WR2
24
125/6
81/83
330
DC/DC Converter
WRA_S-3WR2 & WRB_S-3WR2 Series
2017.08.17-B/1 Page 2 of 6
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
CE
WRA4805S-3WR2
48
(36-75)
80
±5
±300/±15
77/79
1000
WRA4812S-3WR2
±12
±125/±6
80/82
470
WRA4815S-3WR2
±15
±100/±5
80/82
330
WRB4803S-3WR2
3.3
758/38
73/75
2700
WRB4805S-3WR2
5
600/30
74/76
2200
WRB4812S-3WR2
12
250/13
78/80
680
WRB4815S-3WR2
15
200/10
82/84
470
WRB4824S-3WR2
24
125/6
80/82
330
Notes：
1Absolute maximum rating without damage on the converter, but it isn't recommended;
2The capacitive loads of positive and negative outputs are identical.
Input Specifications
Item
Operating Conditions
Min.
Typ.
Max.
Unit
Input Current (full
load/no-load)
5VDC Input
3.3V Output
--
735/40
758/85
mA
Others
805/40
846/85
12VDC Input
3.3V Output
--
278/30
286/40
Others
314/30
338/40
24VDC Input
3.3V Output
--
140/20
145/40
Others
154/20
163/40
48VDC Input
3.3V Output
--
69/5
72/15
Others
78/5
85/15
Reflected Ripple Current
5VDC Input
--
20
--
12VDC Input
--
20
--
24VDC Input
--
55
--
48VDC Input
--
55
--
Surge Voltage (1sec. max.)
5VDC Input
-0.7
--
12
VDC
12VDC Input
-0.7
--
25
24VDC Input
-0.7
--
50
48VDC Input
-0.7
--
100
Starting Voltage
5VDC Input
--
--
4.5
12VDC Input
--
--
9
24VDC Input
--
--
18
48VDC Input
--
--
36
Input Filter
Filter capacitor
Hot Plug
Unavailable
Ctrl *
Module turn-on
The Ctrl end is suspended or of high resistance
Module turn-off
Connect with high level (relative to the input
grounding) to make the 5-10mA current flows
into the Ctrl end.
Note: *For use of Ctrl, please refer to the “design reference” in this manual.
Output Specifications
Item
Operating Conditions
Min.
Typ.
Max.
Unit
Output Voltage Accuracy
5%-100% load，Input voltage range
--
±1
±3
%
No-load Output Voltage
Accuracy
Input voltage range
WRB1203S-3WR2/WRB4803S-3WR2
--
±5
±8
others
--
±1.5
±5
Line Regulation
Full load, the input voltage is from low to high
--
±0.2
±0.5
Load Regulation
5%-100% load
--
±0.6
±1
Transient Recovery Time
25% load step change
--
0.5
3
ms
Transient Response Deviation
--
±2.5
±5
%
Temperature Coefficient
Full load
--
±0.02
±0.03
%/℃
Short Circuit Protection
Continuous, self-recovery
Note: ①Ripple and noise are measured by “parallel cable” method, please see DC-DC Converter Application Notes for specific operation.
DC/DC Converter
WRA_S-3WR2 & WRB_S-3WR2 Series
2017.08.17-B/1 Page 3 of 6
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
General Specifications
Item
Operating Conditions
Min.
Typ.
Max.
Unit
Insulation Voltage
Input-output, with the test time of 1 minute and
the leak current lower than 1mA
1500
--
--
VDC
Insulation Resistance
Input-output, isolation voltage 500VDC
1000
--
--
MΩ
Isolation Capacitance
Input-output, 100KHz/0.1V
--
120
--
pF
Operating Temperature
see Fig. 1
-40
--
+85
℃
Storage Temperature
-55
--
+125
Pin Welding Resistance Temperature
Welding spot is 1.5mm away from the casing,
10 seconds
--
--
+300
Storage Humidity
Non-condensing
--
--
95
%RH
Switching Frequency (PFM Mode)
Full load, nominal input voltage
--
250
--
KHz
MTBF
MIL-HDBK-217F@25℃
1000
--
--
K hours
Physical Specifications
Casing Material
Black flame-retardant and heat-resistant plastic
Dimension
22.00*9.50*12.00 mm
Weight
4.9g(Typ.)
Cooling Method
Free air convection
EMC Specifications
EMI
CE
CISPR32/EN55032 CLASS B (see Fig. 3-②for recommended circuit)
RE
CISPR32/EN55032 CLASS B (see Fig. 3-②for recommended circuit)
EMS
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
Product Characteristic Curve
Output Power Percentage(%)
Environment Temperature. ( )
℃
Temperature Derating Curve
120
100
80
60
40
20
0-40 040 85
Safe Operation Area
WRB0503S-3WR2
60
Other models
Fig 1
DC/DC Converter
WRA_S-3WR2 & WRB_S-3WR2 Series
2017.08.17-B/1 Page 4 of 6
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
Design Reference
1. Recommended circuit
All the DC/DC converters of this series are tested according to the recommended circuit (see Fig. 2) before delivery.
If a further decrease of the input and output ripple is required, properly increase the input & output of additional capacitors Cin1, Cin2, Cs
and Cout; or select capacitors of low equivalent impedance like series capacitor, etc. Cs is used to reduce ripple. No need to add Cs, if
ripple meets the demand .Appropriate filter capacitance shall be chosen, start-up problems may be caused if the capacitance is too
large. For each output circuit, under the condition of safe and reliable operation, the max. capacity of its filter capacitor should be lower
than the max. capacitive load.
Single
1
V in
G N D
C d
C i n 1 C i n 2
L in 26
8
7
+ Vo
0 V
C S
3
R
D 1
V c
L c
C o u t
Dual
+Vo
0V
Cout
6
8
7Cout
Lout
Lout -Vo
Cin1
Vin
GND
2
1
Lin
3
Vc R
Ic
D1
Cd
Cin2
Fig. 2
Vin
5VDC&12VDC
24VDC&48VDC
Cin1
100µF
10µF
Cin2
47µF
1µF
Lin
4.7µH-12µH
Cs
10µF-22µF
Cout
100µF(Typ.)
Lout
2.2µH-10µH
Cd
47nF/100V
2. EMC solution-recommended circuit
LDM1
②
C0
MOV
FUSE
①
C1
+
Vin
GND
+Vo
-Vo
(0V)
DC/DC LO AD
C2
CY
Ctrl
Cd
D1 R
③
Ctrl
Vin
GND
1
C3
Fig. 3
DC/DC Converter
WRA_S-3WR2 & WRB_S-3WR2 Series
2017.08.17-B/1 Page 5 of 6
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
Parameter description:
Model
Vin:5VDC
Vin:12VDC
Vin:24VDC
Vin:48VDC
FUSE
Slow blown fuses according to the actual input current selections of the clients
MOV
--
S14K20
S20K30
S14K60
C0
680µF/25V
680µF/25V
330µF/50V
330µF/100V
C1
4.7µF/50V
4.7µF/100V
LDM1
12µH
C2
4.7µF/50V
4.7µF/100V
C3
Refer to the Cout in Fig.2
CY1
1nF/2KV
D1
RB160M-60V/1A
R
In accordance with the formula:
300-
0.1--
C
DC
I
VV
R=
Cd
47nF/100V
Notes:
①Part ①in Fig. 3 is used for EMS test while part ②is used for EMI filtering; and parts ①and ②may be selected based on needs.
②VCis the voltage of the Ctrl end relative to the GND of the input grounding; VDis the positive-going conduction pressure drop of D1; ICis the current flows
into the Ctrl end and its value is generally 5-10mA, see Fig. 3-③for the peripheral circuit of Ctrl end;
③If there is no recommended parameters, no external component is required.
3. Ctrl end
The modules are of normal output when the Ctrl end is suspended or of high resistance; the modules turn off when connecting with high
level (relative to the input grounding); notice that the current flows into the pin shall be 5 - 10mA, the modules will be permanently damaged
if the current exceeds its max. value (20mA in general).
The value of R can be derived as follows:
300-
0.1--
C
DC
I
VV
R=
For Detailed parameter, please refer to EMC solution-recommended circuit in this manual.
4. Input current
When the electricity is provided by the unstable power supply, please make sure that the range of the output voltage fluctuation and the
ripple voltage of the power supply do not exceed the indicators of the modules. Input current of power supply should afford the flash startup
current of this kind of DC/DC module(see Fig. 5).
Generally: Vin= 5V series Iave =1296mA
Vin=12V series lave =631mA
Vin=24V series lave =363mA
Vin=48V series lave =157mA
Input Current(A)
Input Voltage (V)
Input Voltage
scope
Iave
Fig. 5
5. Output load requirements
When using, the minimum load of the module output should not be less than 5% of the nominal load.In order to meet the performance
parameters of this datasheet, please connect a 5% dummy load in parallel at the output end, the dummy load is generally a resistor, please
note that the resistor needs to be used in derating.
6. For more information please find DC-DC converter application notes on www.mornsun-power.com
DC/DC Converter
WRA_S-3WR2 & WRB_S-3WR2 Series
2017.08.17-B/1 Page 6 of 6
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
Dimensions and Recommended Layout
Notes:
1. Packing information please refer to Product Packing Information which can be downloaded from www.mornsun-power.com. Packing
bag number: 58210004;
2. Recommend to use module with more than 5% load, if not, the ripple of the product may exceeds the specification, but does not
affect the reliability of the product;
3. The recommended unbalance degree of the dual output module load is ≤±5%; if the degree exceeds ±5%, than the product
performance cannot be guaranteed to comply with all parameters in the datasheet. Please contact our technicians directly for
specific information;
4. The maximum capacitive load offered were tested at input voltage range and full load;
5. 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;
6. All index testing methods in this datasheet are based on Company’s corporate standards;
7. We can provide product customization service, please contact our technicians directly for specific information;
8. Specifications are subject to change without prior notice.
MORNSUN Guangzhou Science & Technology Co., Ltd.
Address: No. 5, Kehui St. 1, Kehui Development Center, Science Ave., Guangzhou Science City, Luogang District, Guangzhou, P. R. China
Tel: 86-20-38601850-8801 Fax: 86-20-38601272 E-mail: info@mornsun.cn