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L6565

QUASI-RESONANT SMPS CONTROLLER

QUASI-RESONANT (QR) ZERO-VOLTAGE-

SWITCHING (ZVS) TOPOLOGY

s

LINE FEED FORWARD TO DELIVER

CONSTANT POWER vs. MAINS CHANGE

s

FREQUENCY FOLDBACK FOR OPTIMUM

STANDBY EFFICIENCY

s

PULSE-BY-PULSE & HICCUP-MODE OCP

s

ULTRA-LOW START-UP (< 70碌A(chǔ)) AND

QUIESCENT CURRENT (< 3.5mA)

s

DISABLE FUNCTION (ON/OFF CONTROL)

s

1% PRECISION (@ T

j

= 25擄C) INTERNAL

REFERENCE VOLTAGE

s

鹵400mA TOTEM POLE GATE DRIVER WITH

UVLO PULL-DOWN

s

BLUE ANGEL, ENERGY STAR, ENERGY

2000 COMPLIANT

APPLICATIONS

s

TV/MONITOR SMPS

s

AC-DC ADAPTERS/CHARGERS

s

DIGITAL CONSUMER

s

PRINTERS, FAX MACHINES,

PHOTOCOPIERS AND SCANNERS

s

DIP8(Minidip)

SO-8

ORDERING NUMBERS:

L6565N

L6565D

DESCRIPTION

The L6565 is a current-mode primary controller IC,

specifically designed to build offline Quasi-resonant

ZVS (Zero Voltage Switching at switch turn-on) fly-

back converters.

Quasi-resonant operation is achieved by means of a

transformer demagnetization sensing input that trig-

gers MOSFET's turn-on.

BLOCK DIAGRAM

COMP

2

1

INV

-

+

2.5V

VOLTAGE

REGULATOR

2V

-

+

-

+

5pF

LINE VOLTAGE

FEEDFORWARD

40K

4

CS

VFF

3

8

V

CC

20V

R1

+

R2

V

REF2

-

Blanking

START

UVLO

S

Q

INTERNAL

SUPPLY

Hiccup-mode

OCP

R

Q

V

CC

7

GD

DRIVER

Starter

STOP

ZERO CURRENT

DETECTOR

+

2.1V

1.6V

BLANKING

STARTER

-

Hiccup-mode

OCP

DISABLE

6

GND

5

ZCD

January 2003

1/17

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