FAN501A View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

FAN501A

Offline DCM / CCM Flyback PWM Controller for Charger Applications

Fairchild Semiconductor 

Application Diagram

AC IN

Fuse

RSNS

CSNS

Bridge

Choke

Photo

coupler

CFB

CBLK1

LF

CBLK2

RHV

RSNP

CSNP

DSNP

TX

DR

NP

NS

CO

DG

RBias1

RBias2

RCOMP RSD

NTC

FAN501A

HV

FB

GATE

COMP

CS

SD

VDD

SGND

VS

PGND

RG2

RG1

RCSF

DVDD

RCS

Photo

coupler

Shunt

regulator

RVS1

NA

CComp2

RComp1 CComp1

+

Vo

-

RF1

RF2

CVDD

CVS

RVS2

Figure 2. Typical Application

Internal Block Diagram

VDD

HV 8

VDD 2

SD Fault

OTP Fault

VSOVP Fault

Latch

Protection

VDD OVP Fault

VDD UVLO

17.5V / 6V

Latch released

Internal bias 5V

VDD OVP Fault

PWM Control Block

OCP Fault

7.5V

VCS-LIM

Burst / Green

5V

Mode

Slope

Compensation

ZFB

FB 6

5V

ISD

SD 7

VSD-TH

COMV

AV

Frequency

Hopping

Σ VSAW

COMI

IO Estimator

LEB

CC Control

Correction

SD Fault

VSOVP Fault

VSH

VVS-OVP

S/H

Zero Current

Detector

5

SGND

S/H = Sample and Hold

3

VS

Figure 3. Function Block Diagram

Line Voltage

Detector

1 GATE

10 PGND

9 CS

4 COMP

© 2014 Fairchild Semiconductor Corporation

FAN501A • Rev. 1.0.0

2

www.fairchildsemi.com

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