HA16142FP Datasheet, PDF (13/20 Pages) Renesas Technology Corp – PFC and PWM Controller

3. PFC controller status
Precondition: VREF GOOD, Non latched.
PFC-ON ^1.5V
1.2V
2.75V
PFC-FB
2.34V
2.60V
2/
HA16141P/FP, HA16142P/FP
1.5V
1.2V
1.70V
2.34V
PFC-OUT
PFC pulses stopped
by PFC-ON,
and PG signal high
PG signal high due to
low PFC-FB voltage
PFC pulses stopped due to PFC pulses stopped
high PFC-FB voltage
by PFC-ON,
(overshoot prevention)
and PG signal high
PFC pulses stopped
by PFC-ON,
and PG signal high
PG signal high due to
low PFC-FB voltage
Normal
operation
Normal
operation
Normal
operation
Normal
operation
Notes: 1. All numeric values in the figure are typical values.
2. PFC-ON
The HA16141P/FP can perform on/off control of the PFC function using the PFC-ON pin.
If an AC voltage that has undergone primary rectification and has been divided with an external resistance is input,
PFC stoppage is possible in the event of a low input voltage.
On/off control by means of a logic signal is also possible.
3. PFC-FB
The input to this pin is the voltage obtained by dividing the stepped-up PFC output voltage.
The pin voltage is fed back to the PFC control system, and is also used for step-up voltage logic decisions.
This is outlined in the figure below.
Hysteresis
Feedback voltage
2.50V
2.75V
2.34V
Hysteresis
2.60V
1.70V
PFC-OUT pulse stoppage
(Reduction of step-up voltage overshoot)
2/ (Power Good) signal is output
(Note 3 is continued on the next page)
Rev.4, Sep. 2001, page 11 of 11