ha16158 Renesas Electronics Corporation., ha16158 Datasheet - Page 17

• Manufacturer Part Number: ha16158
• Description: Pfc & Pwm Control Ic
• Manufacturer: Renesas Electronics Corporation.

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.
Rev.2.00 Jan 30, 2007 page 17 of 23
VREF
PWM-SS
PWM-OUT
PFC-OUT
PFC-FB
PFC-OUT
PWM-OUT
3.5V
2.4V
1.5V
Overvoltage Latch Protection Peripheral Circuit
Q
R
S
Figure 7
+
−
−
+
Vcc
Vcc
4.0V
7.1V
14
PWM-SS
VREF
4.0V