ha16158fp Renesas Electronics Corporation., ha16158fp Datasheet - Page 14

• Manufacturer Part Number: ha16158fp
• Description: Pfc & Pwm Control Ic
• Manufacturer: Renesas Electronics Corporation.

HA16158P/FP
4. PFC On/Off Function
On/off control of the PFC function can be performed using the PFC-ON pin.
If an AC voltage that has undergone primary rectification and has been divided by an external resistance is
input, it is possible to halt PFC operation in the event of a low input voltage. On/off control is also possible
by using a logic signal.
This IC also incorporates a function that automatically detects a 100 V system or 200 V system AC voltage
at the PFC-ON pin, and switches multiplier gain and the PFC-CS comparison voltage.
These functions simplify the design of a power supply compatible with worldwide input.
Rev.0, Aug. 2002, page 14 of 23
AC Voltage
Vac
PFC-ON
PFC status
(internal signal)
Multiplier gain
(internal signal)
PFC-SS
compare
voltage
(internal signal)
Em
–0.25
–0.50
0Vac
OFF
0.25
0.05
ON
0V
2.2µF
C1
62Vac
1.5V
720kΩ
12kΩ
R1
R2
Rec+
PFC-ON(dc)
PFC-ON(dc) = 2 ∗ Em / π ∗ R2 / (R1 + R2)
PFC-ON
156Vac
5
3.8V
Figure 4
= 2 ∗ √2 ∗ Vac / π ∗ R2 / (R1 + R2)
1.5V
1.2V
3.8V
3.4V
PFC ON period
PFC-ON/OFF control
Multiplier gain switching
PFC-CS compare
voltage switching
140Vac
3.4V
49Vac
1.2V