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www.fairchildsemi.com

FAN7532

Features

Ballast Control IC

Descriptions

The FAN7532 provides simple and high performance elec-

tronic ballast control functions. Optimized for an electronic

ballast, the FAN7532 requires a minimum board area, and

reduces component counts. The FAN7532 is intended to

drive two power MOSFETs in the classical half-bridge

topology with all the features needed to properly drive and

control a fluorescent lamp. The FAN7532 has many compre-

hensive protection features that work through filament fail-

ure, failure of a lamp to strike, and automatic restarts.

A dedicated timing section in the FAN7532 allows the user

to set the necessary parameters to preheat, ignite, and run the

lamp properly.

16-SOP

鈥?Floating Channel Designed for Bootstrap Operation to

+600V.

鈥?Lower di/dt Gate Driver for Better Noise Immunity

鈥?Driver Current Capability: 250mA/500mA

鈥?Low Start-up and Operating Current: 120碌A(chǔ), 6.4mA

鈥?Under Voltage Lock Out (UVLO) with 1.8V of Hysteresis

鈥?Programmable Preheat Time and Frequency

鈥?Programmable Run Frequency

鈥?Protection from Failure to Strike

鈥?Lamp Filament Sensing

and

Protection

鈥?Automatic Restart for Lamp Exchange

鈥?High Accuracy Oscillator

鈥?16-Pin SOP

Typical Application

鈥?General Purpose Ballast IC

1

5V

9V Vsup

Bias

Current

C

PH

5

UVLO

1.8V

11

Vcc

15.6V

1.5碌

碌

碌

10碌

碌

碌

2.9V

Iph - Irt

11.8V

OLP

Vz

2.9V

1

2.1

R Q

S Q

HVG

Driver

1

VB

16

HO

C

T

6

5V

Ict

Irt

1.70V

6.2I

CT

5.15V

S Q

R

Latch

Frequency

Divider

&

Driving

Logic

OLP

Level

Shift

Vcc

15

VS

13

LO

12

PGND

R

T

8

Current

Source

Current

Source

Irt=Vref/Rt

R

PH

7

Iph=Vref/Rph

Shutdown

Signal

9

OVP

V

CPH

2V

OLP

OLP : Open Lamp Protection

TSD

5V

4

10

2V

GND

OLP

Rev. 1.0.0

漏2005 Fairchild Semiconductor Corporation

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