HA16141P/FP, HA16142P/FP

Rev.4, Sep. 2001, page 11 of 11

3. PFC controller status

PFC-ON

PFC-FB

1.2V

Notes: 1.

2.

3.

All numeric values in the figure are typical values.

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.

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.

2.34V

Precondition: VREF GOOD, Non latched.

1.5V

2/

PFC-OUT

2.75V

2.60V

1.5V

1.70V

2.34V

1.2V

PG signal high due to

low PFC-FB voltage

Normal

operation

PFC pulses stopped due to

high PFC-FB voltage

(overshoot prevention)

PFC pulses stopped

by PFC-ON,

and PG signal high

2.34V

2.75V

2.60V

1.70V

Hysteresis

Hysteresis

PFC-OUT pulse stoppage

(Reduction of step-up voltage overshoot)

2/ (Power Good) signal is output

Feedback voltage

2.50V

(Note 3 is continued on the next page)

PFC pulses stopped

by PFC-ON,

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