FA5640 Datasheet, PDF (5/35 Pages) Fuji Electric – Fuji Switching Power Supply Control IC

FA5640/41/42
4. Block diagram
FA5640
ZCD
ZCD
Bottom
detection
Bottom Skip
control
7.5V _30k
Pulse width
detection
Restart Timer
25μs
VH
1 shot
(290ns)
set
enb
Input
voltage
detection
mode select
signal
VinH
Startup
management
11V/9V
UVLO
Startup
Current
VCC
14V/8V
4.8V
MP1
Off timer
(2μs)
Resistance ratio
MP1 on/off
24k
91.3%/100%
84.1%/100%
VinH
4.8V
10μA
- ^Disable
+
VthFB0 ^0.45V
0.35V
VinH
IS
FB
1/6
Current
comparator
Reset
Max. Ton
(24μs)
SQ
R2
R1
Standby
0.55V
Standby
detection
Soft start
(1ms)
Overload
3.5/3.3V
VthIS
VinH
0.5V
0.45V
VthIS at Standby
VinH
0.15V
0.10V
Timer
enb
200ms
1600ms
OLP
protection
Reset
4.8V Reg.
Internal
supply
enb
Driver
OUT
Off timer
(4.5μs)
ZCD
OVP
detection
OVP1
Latch
protection
6V
Latch timer
60μs
GND
FA5641
Fuji Electric Co., Ltd.
AN-064E Rev.1.1
April 2011
5
http://www.fujielectric.co.jp/products/semiconductor/