ha16174p Renesas Electronics Corporation., ha16174p Datasheet - Page 25

• Manufacturer Part Number: ha16174p
• Description: Power Factor Correction Controller Ic
• Manufacturer: Renesas Electronics Corporation.

HA16174P/FP
5-3. Over Voltage Operation
When the PFC output voltage is larger than 7.5% of the prescribed voltage due to an abnormality in the system or a
sudden change of AC voltage or load, operation of the OUT pin is terminated. When the PFC output voltage returns to
within 5.5% of the prescribed voltage, operation of the OUT pin is restarted. If the PFC output voltage rises to 20%
above the prescribed voltage, the condition is considered definitely abnormal, and output of the PG signal is also
stopped. In this case, too, when the voltage returning to within 5.5% of the prescribed voltage is considered a return to
normal conditions, operation of the OUT pin is restarted and the PG signal is output after the delay time due to
operation of the DELAY pin.
PFC output voltage
Rev.1.00 Jan 06, 2006 page 25 of 36
DELAY pin voltage
DELAY pin current
PG pin voltage
(pulled up by a resistor to the VREF voltage)
Figure 12 Waveforms of Operations after Over Voltage Detection by the FB Pin
OUT
FB
2.688 V
107.5% of the prescribed
105.5% of the prescribed
2.668 V
120% of the prescribed
output voltage
output voltage
output voltage
3.0 V
–10 µA
2.5 V
100 µA