DC/DC Converter
B_S-1WR2 & B_D-1WR2 series
Design Reference
1. Typical application circuit
If it is required to further reduce input and output ripple, a filter capacitor may be connected to the input and output terminals, see Fig.3.
Moreover, choosing a suitable filter capacitor is very important, start-up problems may be caused if the capacitance is too large. Under the
condition of safe and reliable operation, the recommended capacitive load values are shown in Table 1.
Recommended capacitive load value table (Table 1)
Vin(VDC)
Vin
GND
Cin
Cin(µF)
4.7
2.2
2.2
1
--
Vo (VDC)
3.3/5
9
12
15
24
Cout(µF)
10
4.7
2.2
1
0.47
+Vo
3.3/5
12
15
24
--
DC DC
Fig.3
Cout
0V
2. EMC solution-recommended circuit
LDM
Vin
C1
GND
Vin
+Vo
C2
LOAD
Input voltage (VDC)
C1
EMI
C2
LDM
3.3/5/12/15/24
4.7µF /50V
Refer to the Cout in Fig.3
6.8µH
DC/DC
GND
Fig. 4
0V
3. Output load requirements
In order to ensure the converter can work reliably with high efficiency, the minimum load should not less than 10% rated load when it is used.
If the needed power is indeed small, please parallel a resistor on t the output side ( The sum of the efficient power and resistor consumption
power is not less than 10%).
4. For more information please find DC-DC converter application notes on
www.mornsun-power.com
2015.09.21-A/4
Page 4 of 6
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