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L6598

HIGH VOLTAGE RESONANT CONTROLLER

s

s

s

s

s

s

s

s

s

s

s

s

HIGH VOLTAGE RAIL UP TO 600V

dV/dt IMMUNITY

鹵50V/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

SOFT START 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, DIP16 PACKAGES

DIP16

SO16N

ORDERING NUMBERS:

L6598

L6598D

DESCRIPTION

The L6598 is manufactured with the BCD OFF LINE

technology, able to ensure voltage ratings up to

600V, making it perfectly suited for AC/DC Adapters

and wherever a Resonant Topology can be benefi-

cial. The device is intended to drive two Power MOS,

in the classical Half Bridge Topology. A dedicated

Timing Section allows the designer to set Soft Start

Time, Soft Start and Minimum Frequency. An Error

Amplifier, together with the two Enable inputs, are

made available. In addition, the integrated Bootstrap

Diode and the Zener Clamping on low voltage sup-

ply, reduces to a minimum the external parts needed

in the applications.

BLOCK DIAGRAM

V

S

5

6

7

OP AMP

12

+

-

UV

DETECTION

BOOTSTRAP

DRIVER

HVG

DRIVER

16

V

BOOT

HVG

H.V.

OPOUT

OPIN-

OPIN+

15

14

C

BOOT

LOAD

OUT

Ifmin

V

REF

DEAD

TIME

4

Rfmin

LVG DRIVER

Ifstart

V

REF

+

2

Rfstart

CONTROL

LOGIC

Iss

3

Cf

VCO

1

Css

D98IN887A

DRIVING

LOGIC

LEVEL

SHIFTER

Vs

11

10

GND

8

LVG

Vthe1

-

+

-

Vthe2

EN1

9

EN2

February 2000

1/16

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