HA16141P/FP, HA16142P/FP

Rev.5.00 Jun 15, 2005 page 13 of 17

4. PFC-ON pin

AC voltage

Vac

Note: All numeric values in the figure are typical values.

157Vac

PFC Status

(internal status)

Precondition: VREF GOOD, Non latched.

PFC-ON Period

Em

0Vac

62Vac

149Vac

49Vac

PFC-ON

3.83V

0V

1.5V

3.63V

1.2V

OFF

ON

Multiplier gain

(internal status)

0.05

0.25

The following functions are effected by inputting an AC voltage that has undergone primary rectification

and has been divided with an external resistance to the PFC-ON pin (see figure below).

a) Turning PFC operation off when AC voltage is low

b) Switching multiplier gain with AC 100 V system and 200 V system input

Rec+

R1

Switching Multiplier Gain

−

+

R2

2.2

µF

720k

Ω

3.83V

3.63V

1.5V

1.2V

PFC-ON

20k

Ω

PFC-ON/OFF Control

−

+

PFC-ON(dc) = 2

⋅ Em / π ⋅ R2 / (R1 + R2)

= 2

⋅ (√2) ⋅ Vac / π ⋅ R2 / (R1 + R2)