DC/DC Converter
WRA_S-1WR2 & WRB_S-1WR2 Series
1W, Wide input voltage, isolated & regulated output
DC/DC converter
FEATURES
Ultra compact SIP package
Wide range of input voltage (2:1)
Operating temperature range: -40
℃
to +85
℃
Isolation voltage: 1.5K VDC
Low ripple & noise
Short circuit protection (self-recovery)
Patent Protection
RoHS
Remote On/Off
WRA_S-1WR2 & WRB_S-1WR2 series are isolated 1W 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
℃~+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
Input Voltage (VDC)
Part No.
WRA0505S-1WR2
WRA0512S-1WR2
WRA0515S-1WR2
WRB0503S-1WR2
WRB0505S-1WR2
WRB0512S-1WR2
WRB0515S-1WR2
WRB0524S-1WR2
WRA1205S-1WR2
WRA1212S-1WR2
WRA1215S-1WR2
WRB1203S-1WR2
WRB1205S-1WR2
WRB1209S-1WR2
WRB1212S-1WR2
WRB1215S-1WR2
WRB1224S-1WR2
WRA2405S-1WR2
WRA2409S-1WR2
WRA2412S-1WR2
WRA2415S-1WR2
WRB2403S-1WR2
WRB2405S-1WR2
WRB2412S-1WR2
WRB2415S-1WR2
WRB2424S-1WR2
WRA4805S-1WR2
WRA4812S-1WR2
WRA4815S-1WR2
WRB4803S-1WR2
WRB4805S-1WR2
WRB4812S-1WR2
WRB4815S-1WR2
48
(36-75)
80
24
(18-36)
40
12
(9-18)
20
5
(4.5-9)
11
Nominal
(Range)
Max.
①
Output
Output
Voltage(VDC)
±5
±12
±15
3.3
5
12
15
24
±5
±12
±15
3.3
5
9
12
15
24
±5
±9
±12
±15
3.3
5
12
15
24
±5
±12
±15
3.3
5
12
15
Output Current
(mA)(Max./Min.)
±100/±5
±42/±2
±33/±2
303/15
200/10
83/4
67/3
42/2
±100/±5
±42/±2
±33/±2
303/15
200/10
111/6
83/4
67/3
42/2
±100/±5
±56/±3
±42/±2
±33/±2
303/15
200/10
83/4
67/3
42/2
±100/±5
±42/±2
±33/±2
303/15
200/10
83/4
67/3
Ripple & Noise
(mVp-p)
Efficiency (%,
Min./Typ.
)
@ Full Load
71/73
74/76
73/75
69/71
70/72
74/76
73/75
71/73
76/78
79/81
76/78
73/75
75/77
77/79
77/79
78/80
74/76
77/79
77/79
77/79
Max. Capacitive
Load (µF)
1000
470
330
1800
2200
1000
680
470
1000
470
330
2700
2200
1800
1000
680
470
1000
680
470
330
2700
2200
1000
680
470
1000
470
330
2700
2200
1000
680
②
40/75
70/100
100/150
40/75
77/79
73/75
75/77
78/80
70/100
100/150
76/78
75/77
74/76
76/78
78/80
40/75
73/75
74/76
78/80
77/79
Notes:
①Exceeding
the maximum input voltage may cause permanent damage;
②For
the dual output modules, the capacitive loads of positive and negative outputs are the same.
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DC/DC Converter
WRA_S-1WR2 & WRB_S-1WR2 Series
Input Specifications
Item
Operating Conditions
5VDC Input
Input Current (full load/no-load)
12VDC Input
24VDC Input
48VDC Input
5VDC Input
Reflected Ripple Current
12VDC Input
24VDC Input
48VDC Input
5VDC Input
Input Impulse Voltage (1sec. max.)
12VDC Input
24VDC Input
48VDC Input
5VDC Input
Starting Voltage
12VDC Input
24VDC Input
48VDC Input
Input Filter
Hot Plug
Module turn-on
Ctrl*
Module turn-off
Min.
--
--
--
--
--
--
--
--
-0.7
-0.7
-0.7
-0.7
--
--
--
--
Typ.
281/40
111/15
55/6
27/4
30
40
55
45
--
--
--
--
--
--
--
--
Max.
290/60
114/30
57/10
28/6
--
--
--
--
12
25
50
100
4.5
9
18
36
Unit
mA
mA
VDC
Filter capacitor
Unavailable
The Ctrl end is suspended or of high resistance
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
Output Voltage Accuracy
No-load Output Voltage Accuracy
Balance of Output Voltage
Line Regulation
Load Regulation
Transient Recovery Time
Transient Response Deviation
Temperature Coefficient
Short Circuit Protection
Operating Conditions
5%-100% load，Input
voltage range
Input voltage range
Dual output, balanced load
Full load, the input voltage is from low to high
5%-100% load
25% load step change
Full load
3.3V/5V output
others
Min.
--
--
--
--
--
--
--
--
--
Typ.
±2
±1
±1.5
±0.3
±0.2
±0.4
0.5
±2.5
±0.02
Max.
±5
±3
±5
±0.5
±0.5
±0.75
2
±5
±0.03
Unit
%
ms
%
%/℃
Continuous, self-recovery
Note: *Ripple and noise are measured by “parallel cable” method, please see DC-DC Converter Application Notes for specific operation.
General Specifications
Item
Isolation Voltage
Isolation Resistance
Isolation Capacitance
Operating Temperature
Storage Temperature
Pin Welding Resistance Temperature
Storage Humidity
Switching Frequency (PFM Mode)
MTBF
Welding spot is 1.5mm away from the casing,
10 seconds
Non-condensing
Full load, nominal input voltage
MIL-HDBK-217F@25℃
Operating Conditions
Input-output, with the test time of 1 minute and
the leak current lower than 1mA
Input-output, isolation voltage 500VDC
Input-output, 100KHz/0.1V
Derating if the temperature
≥85℃,
(see Fig. 1)
Min.
1500
1000
--
-40
-55
--
--
--
1000
Typ.
--
--
120
--
--
--
--
200
--
Max.
--
--
--
85
125
300
95
--
--
Unit
VDC
MΩ
pF
℃
%RH
KHz
K hours
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MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation
DC/DC Converter
WRA_S-1WR2 & WRB_S-1WR2 Series
Physical Specifications
Casing Material
Dimension
Weight
Cooling Method
Black flame-retardant and heat-resistant plastic (UL94-V0)
22.00*9.50*12.00 mm
4.90g(Typ.)
Free convection
EMC Specifications
EMI
CE
RE
ESD
RS
EFT
EMS
Surge
CS
Voltage dips, short interruptions
and voltage variations immunity
CISPR22/EN55022 CLASS B (see Fig. 3-② for recommended circuit)
CISPR22/EN55022 CLASS B (see Fig. 3-② for recommended circuit)
IEC/EN61000-4-2
IEC/EN61000-4-3
IEC/EN61000-4-4
IEC/EN61000-4-5
IEC/EN61000-4-6
Contact ±4KV
10V/m
±2KV (see Fig. 3-① for recommended circuit)
±2KV (see Fig. 3-① for recommended circuit)
3 Vr.m.s
perf. Criteria B
perf. Criteria A
perf. Criteria B
perf. Criteria B
perf. Criteria A
perf. Criteria B
IEC/EN61000-4-29 0%-70%
Product Characteristic Curve
Output Power Percentage(%)
Temperature Derating Curve
120
100
80
60
40
20
0
Safe Ope ration A rea
-40
0
Fig 1
40 60
85
Environment Temperature.(
℃
)
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DC/DC Converter
WRA_S-1WR2 & WRB_S-1WR2 Series
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
V in
L in 2
6
8
1
C in 1 C in 2
+ Vo
CS Cout
Vin
Cin1
Cin2
Lin
Cs
5VDC&12VDC
100µF
47µF
24VDC&48VDC
10µF
1µF
GND
Cd
Vc
D 1 Lc R
3
7
0V
4.7µH~12µH
10µF~22µF
100µF(Typ.)
2.2μH~10μH
47nF/100V
Dual
Vin
Lin
Cin1 Cin2
7
GND
Cd
Vc
1
D1 Ic R
3
8
Lout
2
6
Lout
Cout
Cout
+Vo
0V
- Vo
Cout
Lout
Cd
Fig. 2
2. EMC solution-recommended circuit
Vin
FUSE
+
LDM1
Vin
Ctrl
C1
C2
Cd
D1
R
Ctrl
+Vo
LOAD
DC/DC
C3
-Vo
(0V)
MOV
GND
C0
①
GND
②
CY1
③
Fig. 3
Parameter description:
Model
FUSE
MOV
C0
C1
LDM1
C2
C3
CY1
D1
R
Cd
Notes:
①
Part
①
in Fig. 3 is used for EMS test while part
②
is used for EMI filtering; and parts
①
and
②
may be selected based on needs.
②
V
C
is the voltage of the Ctrl end relative to the GND of the input grounding; V
D
is the positive-going conduction pressure drop of D1; I
C
is the current flows
into the Ctrl end and its value is generally 5-10mA, see Fig. 3-③ for the peripheral circuit of Ctrl end;
③
If there is no recommended parameters, no external component is required.
Vin:5VDC
--
1000µF/16V
Vin:12VDC
S14K25
1000µF/25V
4.7µF/50V
12µH
4.7µF/50V
Vin:24VDC
S14K35
330µF/50V
Vin:48VDC
S14K60
330µF/100V
4.7µF/100V
4.7µF/100V
Slow blown fuses according to the actual input current selections of the clients
Refer to the Cout in Fig.2
1nF/2KV
RB160M-60/1A
In accordance with the formula:
47nF/100V
R
=
V
C
-
V
D
- 1.0
- 300
I
C
EMC solution-recommended circuit PCB layout
Fig. 4
Note: the min. distance of the bonding pads between input grounding and output grounding shall be
≥
2mm.
2015.08.26-A/4
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DC/DC Converter
WRA_S-1WR2 & WRB_S-1WR2 Series
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:
V
-
V
- 1 .0
R
=
C D
- 300
I
C
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 =450mA
Vin=12V series lave =220mA
Vin=24V series lave =110mA
Vin=48V series lave =55mA
Input Current(A)
Iave
Input Voltage
scope
Input Voltage (V)
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
Dimensions and Recommended Layout
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FPGA/CPLD
