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AN4121

更新时间： 2024-11-14 08:30:47

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		功率因数校正
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描述
Design of Power Factor Correction Circuit

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Application Note AN4121

Design of Power Factor Correction Circuit Using

FAN7527B

power factor is obtained.

1. Introduction

The FAN7527B is an active power factor correction(PFC)

controller for boost PFC application which operates in the

critical conduction mode. It turns on MOSFET when the

inductor current reaches zero and turns off MOSFET when

the inductor current meets the desired input current reference

voltage as shown in Fig. 1. In this way, the input current

waveform follows that of the input voltage, therefore a good

1-1. Internal Block Diagram

It contains following blocks.

• Error amplifier (E/A)

• Zero current detection (Idet)

• Switch current sensing (CS)

• Input voltage sensing (MULT)

• Switch drive (OUT)

Inductor Peak Current

Inductor Current

Inductor Average Current

Gating

Signal

Figure 1. Inductor Current Waveform

Vcc

2.5V Ref

Vcc

Internal

Bias

UVLO

−

12V

11.5V^9V8.5V

OUT

Drive

Output

Timer R

Idet

−

7.2V

6.5V

Zero Current

Detector

2V 1.5V

Static OVP

40k

−

8pF

2.25V

Current Sense

Comparator

Vref

Veao(L)=2.25V

1.8V

Vm1

Vmo

0.25V

Vref

Vea(-)

−

MULT

0 ~ 3.8V

Vm2

INV

Vref~Vref+2.5V

Multiplier

OVP

Current

Detector

Isovp=30uA

Idovp=40uA

Error Amp

Vmo

K =

Vm 1 (Vm 2 − Vref )

EA_OUT

GND

Figure 2. Block diagram of the FAN7527B

Rev. 1.0.1

12 3 4 5 6 7...22

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