FAN6920 Ver la hoja de datos (PDF) - Fairchild Semiconductor

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Fabricante

FAN6920

Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Controller

Fairchild Semiconductor 

Internal Block Diagram

COMP

HV

VDD

INV

CSPFC

FB

CSPWM

DET

2

16

7

RANGE

2.65V

Multi-Vector Amp.

2.75V

2.3V

3

RANGE

2.75V

2.9V

OVP IHV

UVP

VCOMP-H 0.45V

ICOMP-BURST

VCOMP-L

COMP-L

COMP-H

27.5V

Debounce

70µs

OVP

Two-Step

UVLO

12V/7V/5V

Auto-Recovery

Auto-

Recovery

Brownout

S SET Q

R CLR Q

Internal

Bias

15 NC

DRV

6

15.5V

OPFC

4

11

2.5V

THD

Optimizer

Sawtooth

Generator

ton-max

Restarter

Blanking

Circuit

5V

Soft-Start

5ms

0.82V

4.2V

2R

R

PFC

Current Limit

VCOMP-H

COMP-H

COMP-L

Disable

Function

0.2V

Inhibit

Timer

VCTRL-PFC

Debounce

Timer

50ms

2.25ms

VB

28µs

Starter

PFC Burst Mode

VIN

VINV

0.7V

Auto-Recovery

FB OLP

2.3V/0.8V

VINV

PWM-ON/OFF

PFC Zero-Current

Detector

2.1V/1.75V

14

IZCD

10V

Blanking

5

Circuit

Over-Power

Compensation

PWM

Current Limit

IDET

10

tOFF-MIN

IDET

(5µs/20.5µs/2.25ms)

Valley

Detector

(30µA)

1st

Valley

tOFF

Blanking

(2.5µs)

S/H

VDET

2.5V

Auto-Recovery

DET OVP

IRT

5V

IDET

0.7V

100µA

0.8V

tOFF-MIN

+9µs

Auto-Recovery

Debounce

Time

DRV

S SET Q

8

R CLR Q

17.5V

Auto-Recovery

Brownout

Protection

(RT Pin) Prog. OTP

(RT Pin) Externally Triggering

DET Pin OVP

VDD Pin OVP

Internal OTP

Startup

Auto-

Recovery

Protection

VB & Clamp

1

Vcomp to 1.6V

1.2V

VINV

1V/1.2V

Brownout

Comparator

Debounce

100mS

100µs

PFC RANGE Control

Internal

OTP

Auto-Recovery

0.5V

Prog. OTP

10ms

Debounce

9

12

/ Externally Triggering

13 2.4V/2.25V

PFC Burst Mode

ZCD

OPWM

RANGE

GND

RT

VIN

Figure 2. Functional Block Diagram

© 2010 Fairchild Semiconductor Corporation

FAN6920MR • Rev. 1.0.3

3

www.fairchildsemi.com

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