WRA-YMD-15W&WRB-YMD-15W
Series
COMMONTSPECIFICA T IONS
Parameter
Storage Humidity
Operating Temperature
Storage Temperature
Temp. Rise at Full Load
Lead Temperature
Isolation voltage
Isolation resistance
Isolation capacitance
Switching Frequency
MTBF
Cooling
Case material
Weight
Case surface
1.5mmfrom case for 10seconds
Tested f or 1 minute and 1mA max
Test at 500VDC
100KHz / 0.1V
Nominal, full load
1000
Free Air Convection
Nickel-coat ed copper
30
g
2. Efficiency Vs Input voltage
WRA2412YMD-15W
1500
1000
1000
500
-40
-55
50
300
DERATING & EFFICIENCY CURVE
Min.
Typ.
Max
95
85
105
Test conditions
Units
%
°C
°C
°C
°C
VDC
MΩ
pF
KHz
K hours
1. Temperature derating curve
APPLICATION NOTE
Recommended circuit
All the WRA_YMD-15W&WRB_YMD-15W Series have been tested according to the following
recommended testing circuit before leaving factory . This series should be tested under load.
Never be test ed under no load (see Figure 1).
Efficiency VS Input voltage
3. Efficiency Vs Output Power
WRA2412YMD-15W
If you want to further decrease the output ripple, you can increase capacitance properly or choose
Efficiency VS Output load
capacitors with low ESR. However, the capacitance can't exceed the maximum capacitor load in the list.
Recommended capacitance
To ensure these series can operate efficiently and reliably, the recommended capacitance of input and
output sees the below table.
OUTPUT VOLTAGE TRIM UP/DOWN
Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
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