FAN7930B View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

FAN7930B

Critical Conduction Mode PFC Controller

Fairchild Semiconductor 

October 2010

FAN7930B

Critical Conduction Mode PFC Controller

Features

ƒ Additional OVP Detection Pin

ƒ Input Voltage Absent Detection Circuit

ƒ Maximum Switching Frequency Limitation

ƒ Internal Soft-Start and Overshoot-less Control

ƒ Internal Total Harmonic Distortion (THD) Optimizer

ƒ Precise Adjustable Output Over-Voltage Protection

ƒ Open-Feedback Protection and Disable Function

ƒ Zero Current Detector

ƒ 150μs Internal Startup Timer

ƒ MOSFET Over-Current Protection

ƒ Under-Voltage Lockout with 3.5V Hysteresis

ƒ Low Startup and Operating Current

ƒ Totem-Pole Output with High State Clamp

ƒ +500/-800mA Peak Gate Drive Current

ƒ 8-Pin Small Outline Package (SOP)

Applications

ƒ Adapter

ƒ Ballast

ƒ LCD TV, CRT TV

ƒ SMPS

Description

The FAN7930B is an active power factor correction

(PFC) controller for boost PFC applications that

operate in critical conduction mode (CRM). It uses a

voltage-mode PWM that compares an internal ramp

signal with the error amplifier output to generate a

MOSFET turn-off signal. Because the voltage-mode

CRM PFC controller does not need rectified AC line

voltage information, it saves the power loss of an input

voltage sensing network necessary for a current-mode

CRM PFC controller.

FAN7930B provides over-voltage protection, open-

feedback protection, over-current protection, input-

voltage-absent detection, and under-voltage lockout

protection. The additional OVP pin can be used to shut

down the boost power stage when output voltage

exceeds OVP level due to the resistors that are

connected at INV pin are damaged. The FAN7930B can

be disabled if the INV pin voltage is lower than 0.45V

and the operating current decreases to a very low level.

Using a new variable on-time control method, THD is

lower than the conventional CRM boost PFC ICs.

Related Resources

AN-8035 — Design Consideration for Boundary

Conduction Mode PFC Using FAN7930

Ordering Information

Part Number

Operating

Temperature

Range

FAN7930BM

FAN7930BMX

-40 to +125°C

Top Mark

Package

FAN7930B 8-Lead Small Outline Package (SOP)

Packing

Method

Rail

Tape & Reel

© 2010 Fairchild Semiconductor Corporation

FAN7930B • Rev. 1.0.2

www.fairchildsemi.com

Share Link: