HA16141P/FP, HA16142P/FP

Rev.4, Sep. 2001, page 12 of 12

3. PFC controller status (cont.)

Step-up voltage

+B

356V

418V

395V

259V

380V

(Typical Output Voltage)

PFC-FB

2.34V

2.75V

2.60V

1.70V

PFC-OUT

2/

2.5V

(PFC Feedback Voltage)

Precondition: VREF GOOD, PFC-ON, Non latched.

Power Good Period

To Multiplier

Notes:

+B

R1

3.

Notes: 4.

PFC-FB (cont.)

The actual input voltage to the PFC-FB pin is the step-up voltage divided with a resistance (see figure below).

If R1 is set as 710 k

Ω and R2 as 4.7 kΩ, the decision voltage at the step-up pin (+B) is as shown in the figure below.

All numeric values in the figure are typical values.

−

+

R2

710k

Ω

2.5V

PFC-FB

PFC-EO

4.7k

Ω