ha16158 Renesas Electronics Corporation., ha16158 Datasheet - Page 14

• Manufacturer Part Number: ha16158
• 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.
When the PFC function is turned on/off by using the PFC-ON pin, however, the PFC-SS pin cannot be reset. Therefore,
a soft start is not operated at the start-up by the PFC-ON pin.
The figure below illustrates an example of circuit for simultaneous reset of the PFC-SS pin and PWM-SS pin.
VREF
PFC-SS
PWM-SS
ON/OFF
PFC-ON
signal
Figure 4 Example of Circuit Configuration to Turn On/Off PFC & PWM Functions
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.2.00 Jan 30, 2007 page 14 of 23