DC/DC Converter

B_S-1WR2 & B_D-1WR2 series

2018.04.13-B/1

Page 4 of 6

MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation

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.

Vin

GND

+Vo

0V

DC

Cin

DC

Cout

Fig.3

Recommended capacitive load value table (Table 1)

Vin(VDC)

Cin(µF)

Vo (VDC)

Cout(µF)

3.3/5

4.7

3.3/5

10

12

2.2

9

4.7

15

2.2

12

2.2

24

1

15

1

--

--

24

0.47

2. EMC solution-recommended circuit

Vin

GND

+Vo

0V

DC/DC

LOAD

LDM

C1

Vin

GND

C2

Fig. 4

Input voltage (VDC)

3.3/5/12/15/24

EMI

C1

4.7µF /50V

C2

Refer to the Cout in Fig.3

LDM

6.8µH

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 the output side ( The sum of the efficient power and resistor consumption

power is not less than 10%).