ha16158fp Renesas Electronics Corporation., ha16158fp Datasheet - Page 11

• Manufacturer Part Number: ha16158fp
• Description: Pfc & Pwm Control Ic
• Manufacturer: Renesas Electronics Corporation.

Functional Description
1. UVL Circuit
The UVL circuit monitors the Vcc voltage and halts operation of the IC in the event of a low voltage.
The voltage for detecting Vcc has a hysteresis characteristic, with 16.0 V as the start threshold and 10.0 V
as the shutdown threshold.
When the IC has been halted by the UVL circuit, control is performed to fix driver circuit output low and
halt VREF output and the oscillator.
Vcc
VREF
V_CT
(internal signal)
PWM-RESET
(internal signal)
PFC-DT
(internal signal)
PFC-RAMP
(internal signal)
PWM-OUT
PFC-OUT
16.0V
4.5V
Figure 1
Rev.0, Aug. 2002, page 11 of 23
10.0V
4.5V
HA16158P/FP