FAN6921MLMY datasheet(3/23 Pages) FAIRCHILD

No. de pieza	FAN6921MLMY

Descripción Electrónicos	Integrated Critical Mode PFC/Quasi-Resonant Current Mode PWM Controller

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Fabricante Electrónico	FAIRCHILD [Fairchild Semiconductor]

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FAN6921ML • Rev. 1.0.1

3

Internal Block Diagram

CSPWM

2

16

7

3

4

11

5

10

9

12

13

1

8

6

14

0.7V

0.3V

2.5V

INV

2.3V

COMP

0.45V

CSPFC

Blanking

Circuit

0.6V

Sawtooth

Generator

/tON-MAX-PFC

THD

Optimizer

Multi-Vector Amp.

ZCD

OPFC

DRV

GND

10V

IZCD

2.1V/1.75V

Inhibit

Timer

PFC Zero Current

Detector

VDD

Two Steps

UVLO

18V/10V/7.5V

Internal

Bias

Latched

OVP

UVP

Disable

Function

0.2V

Restarter

PFC

Current Limit

15.5V

Latched

17.5V

OPWM

DET

FB

RT

VIN

HV

RANGE

IHV

Debounce

100ms

2.35V/2.15V

PFC RANGE Control

1V/1.2V

Latched

2.75V

2.65V

2.75V

RANGE

2.9V

RANGE

4.2V

2R

R

Debounce

Time

100uA

Soft-Start

9.5ms

PWM

Current Limit

IDET

Internal

OTP

Latched

100us

10ms

0.8V

0.5V

IRT

Prog. OTP

/ Externally Triggering

Blanking

Circuit

IDET

5V

Latched

(RT Pin) Prog. OTP

Brownout

Q

SET

CLR

S

R

Q

SET

CLR

S

R

VB & clamp

VCOMP to 1.6V

FB OLP

Timer

50ms

VB

Over Power

Compensation

VCTL-PFC-ON/OFF

Starter

2.5ms

32.5µs

15

NC

27.5V

OVP

1.2V

VINV

Startup

S/H

tOFF-MIN

(8us/37µs/2.5ms)

DET OVP

2.5V

tOFF

Blanking

(4µs)

VDET

Latched

Valley

Detector

IDET

1st Valley

tOFF-MIN

+9µs

Debounce

100ms

Brownout

comparator

Lathed

Protection

Brownout

Protection

(RT Pin) Externally Triggering

Output Open-Loop (FB Pin)

Output Short Circuit (FB

Pin)

Debounce

550ms / 150µs

Debounce

70µs

VC & PFC ON/OFF &

Multi Vector Amp.

ON/OFF

VINV

0.8V

VC

DET pin OVP

VDD pin OVP

Internal OTP

Output Over Power/ Overload (FB Pin)

Figure 2. Functional Block Diagram

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