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L6566B

Multi-mode controller for SMPS

STMicroelectronics 

L6566B

Multi-mode controller for SMPS

Features

■ Selectable multi-mode operation:

fixed frequency or quasi-resonant

■ On-board 700 V high-voltage start-up

■ Advanced light load management

■ Low quiescent current (< 3 mA)

■ Adaptive UVLO

■ Line feedforward for constant power capability

vs mains voltage

■ Pulse-by-pulse OCP, shutdown on overload

(latched or autorestart)

■ Transformer saturation detection

■ Programmable frequency modulation for EMI

reduction

■ Latched or autorestart OVP

■ Brownout protection

■ -600/+800 mA totem pole gate driver with

active pull-down during UVLO

■ SO16N package

Figure 1. Block diagram

SO16N

Applications

■ Hi-end AC-DC adapter/charger

■ LCD TV/monitor, PDP

■ digital consumer, IT equipment

■ single-stage PFC

VREF

SS

COMP

VFF

1

HV

IHV

VCC

5

10

14

SOFT-START

&

FAULT MNGT

TIME

OUT

VOLTAGE

REGULATOR

&

ADAPTIVE UVLO

Ref erence

voltages

Internal supply

UVLO

VCC

9

15

LOW CLAMP OFF2

& DISABLE

VCC

OVP

6.4V

Icharge

OVPL

LINE VOLTAGE

7.7V

Q

FEEDFORWARD

CS

LEB

1.5 V

7

-+ -+ +-

Vth

PWM

OCP

VCC

6

FMOD

UVLO_SHF

-

+

400 uA

5.7V

+

-

BURST-MODE

OSC 13

OSCILLATOR

MODE/SC 12

ZCD

50 mV

100 mV

11

MODE SELECTION

&

TURN-ON LOGIC

ZERO CURRENT

-

DETECTOR

+

OVERVOLTAGE

OVP

PROTECTION

R

Q

S

TIME

OUT OVPL

LATCH

OFF2

IC_LATCH

Hiccup-mode

OCP logic

OCP2

DRIVER

14V

4

GD

4.5V

DIS

8

16

AC_OK

-

3V

15 µA

0.450V

0.485V

+

AC_FAIL

UVLO

DISABLE

3

May 2008

Rev 2

1/51

www.st.com

51

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