FAN4822

更新时间： 2024-11-24 22:50:59

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		功率因数校正控制器
页数	文件大小	规格书
10页	74K
描述
ZVS Average Current PFC Controller

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中文翻译

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数据手册

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FAN4822 数据手册

www.fairchildsemi.com

FAN4 8 2 2

ZVS Ave ra g e Cu rre n t P FC Co n t ro lle r

Features

General Description

• Average current sensing, continuous boost, leading edge

PFC for low total harmonic distortion and near unity

power factor

• Built-in ZVS switch control with fast response for high

efﬁciency at high power levels

• Average line voltage compensation with brownout control

• Current fed gain modulator improves noise immunity and

provides universal input operation

• Overvoltage comparator eliminates output “runaway” due

to load removal

The FAN4822 is a PFC controller designed speciﬁcally for

high power applications. The controller contains all of the

functions necessary to implement an average current boost

PFC converter, along with a Zero Voltage Switch (ZVS) con-

troller to reduce diode recovery and MOSFET turn-on

losses.

The average current boost PFC circuit provides high power

factor (>98%) and low Total Harmonic Distortion (THD).

Built-in safety features include undervoltage lockout, over-

voltage protection, peak current limiting, and input voltage

brownout protection.

• UVLO, current limit, and soft-start

• Precision 1.3% reference

The ZVS control section drives an external ZVS MOSFET

which, combined with a diode and inductor, soft switches the

boost regulator. This technique reduces diode reverse recov-

ery and MOSFET switching losses to reduce EMI and maxi-

mize efﬁciency.

Block Diagram

VEAO

VEA

GND

IEAO

V_CC

–

OVP

V_CCZ

13.5V

2.5V

I_AC

R+

IEA

2.7V

–

GAIN

–

MODULATOR

–

V_RMS

I LIMIT

R–

–1V

I_SENSE

–

PFC OUT

R_TC_T

REF

OSC

V_CCZ

REF

ZVS OUT

ZV SENSE

––

PWR GND

REV. 1.0.1 8/10/01

12 3 4 5 6 7...10

中文翻译

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