AND8098/D

http://onsemi.com

9

Figure 12. Line Regulation of the Dual Output

Buck-boost

INPUT VOLTAGE (Vac)

150

-10

50

300

-25

0

-20

-15

250

200

100

-5

Output 1 with 200 mA

Output 2 with 150 mA

CONCLUSION

100 mA high-voltage low-cost buck and buck-boost

circuits using NCP1052 are presented. These circuits are

designed for cost-saving non-isolated application so that

optocoupler and transformer are saved. The possible input

voltage range is from 20 Vdc to 700 Vdc so that it is suitable

for general AC/DC and DC/DC applications with positive or

negative output voltages. It is noted that the standby ability

charging current. However, it can be improved by adding an

each component in the circuits is explained. By replacing the

NCP1052 with NCP1055, the output current can be

increased. By adding an auxiliary winding, multi-output can

be obtained. A 12 V / 100 mA demo board is presented with

typical 65% efficiency.