HA16141P Datasheet, PDF (13/18 Pages) Hitachi Semiconductor – PFC and PWM Controller

4. PFC-ON pin
HA16141P/FP, HA16142P/FP
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+
W R1 720k
PFC-ON
3.83V
3.63V
-
+
Switching Multiplier Gain
2.2mF
R2 20kW
-
+
1.5V
1.2V
PFC-ON/OFF Control
× p × PFC-ON(dc) = 2 Em / R2 / (R1 + R2)
= 2 × (Ö2) × Vac / p × 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
(internal status)
0.25
0.05
Note: All numeric values in the figure are typical values.
1.2V
Rev.4, Sep. 2001, page 13 of 18