WRA-YD-4W&WRB-YD-4W
Series
4W, WIDE INPUT, ISOLATED & REGULATED DUAL/SINGLE OUTPUT DC-DC CONVERTER
DC-
SELECTION GUIDE
Input
Order code
Nominal
Voltage(VDC)
Voltage
Range
9VDC - 18VDC
9VDC - 18VDC
9VDC - 18VDC
9VDC - 18VDC
9VDC - 18VDC
9VDC - 18VDC
9VDC - 18VDC
9VDC - 18VDC
18VDC - 36VDC
18VDC - 36VDC
18VDC - 36VDC
18VDC - 36VDC
18VDC - 36VDC
18VDC - 36VDC
18VDC - 36VDC
18VDC - 36VDC
36VDC - 72VDC
36VDC - 72VDC
36VDC - 72VDC
36VDC - 72VDC
36VDC - 72VDC
36VDC - 72VDC
36VDC - 72VDC
36VDC - 72VDC
9VDC - 18VDC
9VDC - 18VDC
9VDC - 18VDC
9VDC - 18VDC
9VDC - 18VDC
9VDC - 18VDC
9VDC - 18VDC
9VDC - 18VDC
18VDC - 36VDC
18VDC - 36VDC
18VDC - 36VDC
18VDC - 36VDC
18VDC - 36VDC
18VDC - 36VDC
18VDC - 36VDC
18VDC - 36VDC
36VDC - 72VDC
36VDC - 72VDC
36VDC - 72VDC
36VDC - 72VDC
36VDC - 72VDC
36VDC - 72VDC
36VDC - 72VDC
36VDC - 72VDC
3.3VDC
5VDC
7.2VDC
9VDC
12VDC
15VDC
18VDC
24VDC
3.3VDC
5VDC
7.2VDC
9VDC
12VDC
15VDC
18VDC
24VDC
3.3VDC
5VDC
7.2VDC
9VDC
12VDC
15VDC
18VDC
24VDC
±3.3VDC
±5VDC
±7.2VDC
±9VDC
±12VDC
±15VDC
±18VDC
±24VDC
±3.3VDC
±5VDC
±7.2VDC
±9VDC
±12VDC
±15VDC
±18VDC
±24VDC
±3.3VDC
±5VDC
±7.2VDC
±9VDC
±12VDC
±15VDC
±18VDC
±24VDC
1000mA
800mA
556mA
444mA
333mA
267mA
222mA
167mA
1000mA
800mA
556mA
444mA
333mA
267mA
222mA
167mA
1000mA
800mA
556mA
444mA
333mA
267mA
222mA
167mA
±500mA
±400mA
±278mA
±222mA
±167mA
±133mA
±111mA
±83mA
±500mA
±400mA
±278mA
±222mA
±167mA
±133mA
±111mA
±83mA
±500mA
±400mA
±278mA
±222mA
±167mA
±133mA
±111mA
±83mA
Output
Current max.
FEATURES
◆
Wide (2:1) Input Range
◆
24Pin DIP Package
WRB1203YD-1000
WRB1205YD-4W
WRB1207YD-4W
WRB1209YD-4W
WRB1212YD-4W
WRB1215YD-4W
WRB1218YD-4W
WRB1224YD-4W
WRB2403YD-1000
WRB2405YD-4W
12
12
12
12
12
12
12
12
24
24
24
24
24
24
24
24
48
48
48
48
48
48
48
48
12
12
12
12
12
12
12
12
24
24
24
24
24
24
24
24
48
48
48
48
48
48
48
48
◆1500VDC
Isolation
◆Operating
Temperature: -40℃½﹢85℃
◆High
Efficiency Up To 83%
◆Low
Profile Metal Package
◆Continuous
Short Circuit Protection
◆
Pin-Compatible With Multiple Manufacturers
◆RoHS
Compliance
◆MTBF>1000Khours
WRB2407YD-4W
WRB2409YD-4W
WRB2412YD-4W
WRB2415YD-4W
WRB2418YD-4W
WRB2424YD-4W
WRB4803YD-1000
WRB4805YD-4W
WRB4807YD-4W
WRB4809YD-4W
MODEL SELECTION
①
②
③ ④
⑤
⑥
WRB 24 15 Y D -4W(267)
WRB4812YD-4W
WRB4815YD-4W
WRB4818YD-4W
WRB4824YD-4W
WRA1203YD-500
WRA1205YD-4W
WRA1207YD-4W
WRA1209YD-4W
①Product
Series
②Input
Voltage
③Output
Voltage
④Wide
(2:1) Input Range
⑤DIP24
Package Style
⑥Rated
Power(Output current)
The WRA_YD-4W & WRB_YD-4W Series are
specially designed for applications where a wide
range input voltage power supplies are isolated
from the input power supply in a distributed
power supply system on a circuit board.These
products apply to:
1) Where the voltage of the input power
supply is wide range (Voltage range≤2:1);
2) Where isolation is necessary between
input
and
output
(Isolation
voltage≤1500VDC);
3) Where the regulation of the Output voltage
and the output ripple noise are demanded.
APPLICATIONS
WRA1212YD-4W
WRA1215YD-4W
WRA1218YD-4W
WRA1224YD-4W
WRA2403YD-500
WRA2405YD-4W
WRA2407YD-4W
WRA2409YD-4W
WRA2412YD-4W
WRA2415YD-4W
WRA2418YD-4W
WRA2424YD-4W
WRA4803YD-500
WRA4805YD-4W
WRA4807YD-4W
WRA4809YD-4W
WRA4812YD-4W
MICRODC reserves the copyright
WRA4815YD-4W
WRA4818YD-4W
WRA4824YD-4W
http://www.microdc.cn
Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
Page 1 of 3
WRA-YD-4W&WRB-YD-4W
Series
Input Specifications
Voltage range
12VDC, 9~18VDC
24VDC, 18~36VDC
48VDC, 36~72VDC
Filter
Rated voltage (60 sec)
Resistance
Capacitance
Operating temperature (ambient)
Storage temperature
Case temperature
Derating
Humidity (non-condensing)
Cooling
p(Pi) Network
1500 VDC
> 1000MOhm
120pF, typ.
-40°C ... +85°C
-55°C ... +125°C
+100°C, max.
None required
Up to 90%
Free-air Convection
Weight
Case material
Isolation Specifications
General Specifications
Efficiency
Switching Frequency
Output Specifications
Voltage accuracy
Voltage balance (Dual Output)
Ripple & noise (at 20MHz BW)
Short circuit protection
Short circuit restart
Line voltage regulation
Load voltage regulation
Temperature coefficient
Dimensions
±1%, max.
±1%
60mVp-p, max.
Continuous
Automatic
±0.5%, max.
±0.5%, max.
±0.02%/°C, typ.
31.75x20.32x10.16mm
1.25x0.8x0.4inches
19g
Nickel-Coated Copper
TYPICAL CHARACTERISTICS
73% to 81%
250KHz, typ. 100% load
Environmental Specifications
Physical Specifications
MTBF:
> 1,036,000 hrs (MIL-HDBK-217F, Ground Benign, t=+25°C)
Specifications are subject to change without notification
APPLICATION NOTE
Temperature Derating Graph
Requirement on output load
In order to ensure the product operate efficiently and reliably,in addition to a
max load(namely full load), a minimum load is specified for this kind of
DC/DC converter.Make sure the specified range of input voltage is not
exceeded,the minimum output load
no less than 10% load
the actual
load.If
load is less than the specified minimum load, the output ripple may increase
sharply while its efficiency and reliability will reduce greatly.If the actual
output power is very small,please add an appropriate resistor as extra
loading,or contact our company for other lower output power products.
Recommended Circuit
All the WRA_YD-4W&WRB_YD-4W Series have been tested according to
the following recommended testing circuit before leaving factory.This series
should be tested under load(See figure 1).
If you want to further decrease the input/output ripple,you can increase
capacitance properly or choose capacitors with low ESR. However, the
capacitance of the output filter capacitor must be proper. If the capacitance
is too big, a startup problem might arise. For every channel of output,
provided the safe and reliable operation is ensured, the greatest capacitance
of its filter capacitor sees (Table 1).
General:
Cin: 5V＆12V 100μF
24V＆48V 100μF-47μF
Cout: 10μF/100mA
RECOMMENDED CIRCUIT
Output Graph
Input current
While using unstable power source,please ensure the output voltage and
ripple voltage do not exceed indexes of the converter. Input current of
power supply should afford the startup current of this kind of DC/DC module
(See figure 2).
General:Ip≤1.4*Iin-max
No parallel connection or plug and play
http://www.microdc.cn
Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
Page 2 of 3
WRA-YD-4W&WRB-YD-4W
Series
OUTLINE DIMENSIONS
＆
FOOTPRINT DETAILS
MECHANICAL DIMENSIONS
RECOMMENDED FOOTPRINT
Note:
Unit:mm[inch]
Pin section tolerances:±0.10mm[±0.004inch]
General tolerances:±0.25mm[±0.010inch]
RECOMMENDED FOOTPRINT
Top view grid:2.54mm(0.1inch)
diameter:1.00mm(0.039inch)
FOOTPRINT DETAILS
TUBE OUTLINE DIMENSIONS
Pin
2、3
9
11
14
16
22、23
NC:No connection
Single
-V
Input
N.C
N.C
+V
Output
-V
Output
+V
Input
Dual
-V
Input
Common
-V
Output
+V
Outpu
t
Common
+V
Input
When the environment temperature is higher than
71 , the product output power should be less
71℃,
then 60% of the rated power.
No parallel connection or plug and play.
Use dual output simultaneously,forbid pening
output pin (0V) to use as single output.
Note:
Note:
Unit :mm[inch]
General tolerances:±0.50mm[±0.020inch]
L=530mm[20.866inch] Tube Quantity: 15pcs
L=220mm[8.661inch] Tube Quantity: 6pcs
1. The load shouldn't be less than 10%, otherwise ripple will increase dramatically.
2. Operation under 10% load will not damage the converter; However, they may not meet all specification listed.
3. All specifications measured at Ta=25°C, humidity<75%, nominal input voltage and rated output load unless otherwise
specified.
4. In this data sheet, all the test methods of indications are based on corporate standards.
5. Only typical models listed, other models may be different, please contact our technical person for more details.
http://www.microdc.cn
Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
Page 3 of 3
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