Quasi-Resonant IC FA5530/31/32
Features
FA5531 Block Diagram
Features
Features
FA5531 Block Diagram
FA5531 Block Diagram
• Internal start-up circuit with 500V rating and low
frequency operation achieves 140mW input at no load.
• Small Output Capacitance : Linearly reduced
frequency for lighter load causes small ripple voltage.
•Suitable for Low Noise and High Efficiency about 90%
•Line-up of 3 types for maximum frequency and OLP
5530: 65kHz max.,16Vmax.-VCC,Auto-restart OLP
5531:130kHz max.,28Vmax.-VCC,Auto-restart OLP
5532:130kHz max.,28Vmax.-VCC,Timer-Latched OLP
•High ability of driving Power MOSFET ( High / Low
side : 17 ohm / 3.5 ohm ) : available to 200W output
•Vcc rating 28V allows no series regulator for
auxiliary winding to clamp Vcc voltage for FA5531/32.
•1ms Fixed Soft Start time
•Timer Latched Over-Voltage Protection of 16V/28V Vcc
•8 pins package ( DIP/SO )
Usage : Notebook PC, LCD Monitor, LCD-TV etc.
Valley
detection
Time out
(5µs)
1 shot
(380ns)
Max. fsw
Blanking
S
R
Q
Soft start
(1ms)
Start up
Current
UVLO
VH
VCC
5V Reg.
5V Reg.
Check
Internal
supply
Driver
OUT
Timer
latch
(48µs)
Start up
management
Logic
Reset
Variable
max.130kHz
Current
comparator
1V
0.4V
3.3V
Overload
Disable
28V
VCC
8V
ZCD
OVP 1
OVP 2
9.85V/9.1V
Reset
CLR
GND
FB
IS
ZCD
Timer
190ms
1510ms
5V
20kΩ
125k
125k
5V
50uA
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