HA16158P Datasheet, PDF (16/23 Pages) Renesas Technology Corp – PFC & PWM Control IC

HA16158P/FP
6. Overvoltage Latch Protection (for PWM Control)
This is a protection function that halts PWM-OUT and PFC-OUT if the secondary-side PWM output
voltage is abnormally high.
Overvoltage signal input is shared with the PWM-SS pin. When this pin is pulled up to 4.0 V or higher, the
control circuit identifies an overvoltage error and halts PWM-OUT and PFC-OUT.
The power supply is turned off, and the latch is released when the VCC voltage falls to 7.1 V or below.
PFC-OUT
PWM-OUT
QS
R
2.4V
1.5V
PFC-FB
Vcc
4.0V
Vcc
VREF
7.1V
PWM-SS
14
Overvoltage Latch Protection Peripheral Circuit
VREF
4.0V
PWM-SS
3.5V
PWM-OUT
PFC-OUT
Figure 6
Rev.0, Aug. 2002, page 16 of 23