ha16178fp Renesas Electronics Corporation., ha16178fp Datasheet - Page 15

• Manufacturer Part Number: ha16178fp
• Description: Power Factor Correction Controller Ic
• Manufacturer: Renesas Electronics Corporation.

HA16178P/FP
3. Soft Start
This function prevents applying excessive stress on external components and overshooting of the PFC output voltage (B
+ voltage) when start up. The pulse width is gradually widening from 0% duty cycle. During soft-start operation, the
SS and CAO signals lower with link. The duty cycle is controlled by the CAO signal.
The soft-start time can be set by an external capacity.
PFC output voltage
REJ03D0903-0100 Rev.1.00 Jun 12, 2007
Page 15 of 24
PFC-ON
CAO
OUT
SS
CT
1.75 V
Figure 3 Soft-Start Operation Waveform
CAO
SS