HA16158P Datasheet, PDF (11/23 Pages) Renesas Technology Corp – PFC & PWM Control IC

HA16158P/FP
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
16.0V
4.5V
10.0V
4.5V
V_CT
(internal signal)
PWM-RESET
(internal signal)
PFC-DT
(internal signal)
PFC-RAMP
(internal signal)
PWM-OUT
PFC-OUT
Figure 1
Rev.0, Aug. 2002, page 11 of 23