ha16174p Renesas Electronics Corporation., ha16174p Datasheet - Page 22

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

HA16174P/FP
5. FB Pin Function
The FB pin is a feedback input for the PFC output voltage. This pin is applied to voltage divided PFC output with
resistors. The PFC output voltage is controlled so that the applied voltage on FB is 2.5 V. The FB pin function
provides protection against abnormal PFC output voltages. The protective functions are over voltage detection, low-
voltage detection, and Power Good (PG) signal control. These functions do not operate when VREF voltage is lower
than 4 V as UVL operation and shut down.
PFC
Output voltage
Rev.1.00 Jan 06, 2006 page 22 of 36
820 k
33 n
56 k
24 k
720 k
20 k
PGADJ
DELAY
VREF
4.7 µ
VREF
2.2 µ
EO
FB
SS
14
15
5
4
3
VREF
25 µA
Figure 9 Internal Circuits Connected to the FB Pin
10 µA
2.5 V
100 µA
VREF
2.40 V
2.5 V
S Q
R Q
0.50 V
2.688 V
2.638 V
2.638 V
3.0 V
B+OVP
B+PG
RESET
FB control
Gate Driver
+/– 1.0 A (PEAK)
11
1
To
Power MOSFET
gate
OUT
PG
5.1 k
VREF