FAN501A Datasheet, PDF (2/16 Pages) Fairchild Semiconductor – Offline DCM / CCM Flyback PWM Controller for Charger Applications

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