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L6574

CFL/TL BALLAST DRIVER PREHEAT AND DIMMING

s

s

s

s

s

s

s

s

s

s

s

s

s

HIGH VOLTAGE RAIL UP TO 600V

dV/dt IMMUNITY 鹵 50 V/ns IN FULL

TEMPERATURE RANGE

DRIVER CURRENT CAPABILITY:

250mA SOURCE

450mA SINK

SWITCHING TIMES 80/40ns RISE/FALL

WITH 1nF LOAD

CMOS SHUT DOWN INPUT

UNDER VOLTAGE LOCK OUT

PREHEAT AND FREQUENCY SHIFTING

TIMING

SENSE OP AMP FOR CLOSED LOOP

CONTROL OR PROTECTION FEATURES

HIGH ACCURACY CURRENT CONTROLLED

OSCILLATOR

INTEGRATED BOOTSTRAP DIODE

CLAMPING ON VS.

SO16, DIP 16 PACKAGES

SO16N

DIP16

ORDERING NUMBERS:

L6574D

L6574

The device is intended to drive two power MOS-

FETS, in the classical half bridge topology, ensur-

ing all the features needed to drive and properly

control a fluorescent bulb.

A dedicated timing section in the L6574 allows the

user set the necessary parameters for proper pre-

heat and ignition of the lamp.

Also, an OP AMP is available to implement closed

loop control of the lamp current during normal

lamp burning.

An integrated bootstrap section, eliminating the nor-

mally required bootstrap diode and the zener clamp-

ing on Vs, makes the L6574 well suited for low cost

applications where few additional components are

needed to build a high performance ballast.

DESCRIPTION

In order to ensure voltage ratings in excess of

600V, the L6574 is manufactured with BCD OFF

LINE technology, which makes it well suited for

lamp ballast applications.

BLOCK DIAGRAM

H.V.

V

S

OP AMP

OPOUT

OPIN-

OPIN+

OUT

Imin

V

REF

DEAD

TIME

Ifs

Imax

V

REF

+

-

R

PRE

CONTROL

LOGIC

Vthpre

+

-

V

THE

EN2

V

THE

EN1

Ipre

DRIVING

LOGIC

LEVEL

SHIFTER

V

S

LVG

R

ING

LVG DRIVER

GND

V

BOOT

+

-

UV

DETECTION

BOOTSTRAP

DRIVER

HVG

DRIVER

HVG

C

BOOT

LOAD

+

-

+

-

VCO

Cf

C

PRE

D97IN493A

September 2003

1/10

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