HA16142FP Datasheet, PDF (15/20 Pages) Renesas Technology Corp – PFC and PWM Controller

HA16141P/FP, HA16142P/FP
4. PFC-ON pin
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
Em
Rec+
R1 720kΩ
PFC-ON
2.2µF
R2 20kΩ
3.83V
3.63V _−
+
−
+
1.5V
1.2V
Switching Multiplier Gain
PFC-ON/OFF Control
PFC-ON(dc) = 2 ⋅ Em / π ⋅ R2 / (R1 + R2)
= 2 ⋅ (√ ) ⋅ Vac / π ⋅ R2 / (R1 + R2)
Precondition: VREF GOOD, Non latched.
AC voltage
Vac
157Vac
62Vac
0Vac
149Vac
49Vac
PFC-ON
3.83V
1.5V
0V
3.63V
PFC Status
(internal status)
ON
OFF
PFC-ON Period
Multiplier gain ^0.25
(internal status)
0.05
Note: All numeric values in the figure are typical values.
1.2V
Rev.4, Sep. 2001, page 13 of 13