AND8098 Datasheet, PDF (9/10 Pages) ON Semiconductor – Low-Cost 100 mA High-Voltage Buck and Buck-Boost Using NCP1052

AND8098/D
0
Output 2 with 150 mA
-5
-10
-15
-20
Output 1 with 200 mA
-25
50
100
150
200
250
300
INPUT VOLTAGE (Vac)
Figure 12. Line Regulation of the Dual Output
Buck-boost
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
of the circuits is not good because of the V_CC capacitor
charging current. However, it can be improved by adding an
auxiliary winding to the V_CC. The design consideration of
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.
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