FA5640 Datasheet, PDF (4/35 Pages) Fuji Electric – Fuji Switching Power Supply Control IC

FA5640/41/42
1. Overview
FA5640 series are a quasi-resonant type switching power supply control IC with excellent stand-by characteristics.
Though it is a small package with 8 pins, it has a lot of functions and enables to decrease external parts. Therefore it is
possible to realize a small size and a high cost-performance power supply.
2. Features
• A quasi-resonant type switching power supply
• A power supply with excellent standby characteristics
• Low power consumption achieved by integrated startup circuit
• Low current consumption, During operation: 0.85 mA
• Control of number of bottom skips by on-off width detection
• Burst operation function under light load
• Built-in drive circuit directly connectable to a power MOSFET, Output current: 0.5 A (sink)/0.25 A (source)
• Built-in overload protection function
• Built-in latch protection function based on overvoltage detection on the secondary side
• Maximum input threshold voltage of IS pin and threshold voltage of stopping on-pulse are compensated by detecting
high-line voltage.
• Built-in under voltage lock out function, ON threshold voltage: 14 V and 10 V
• Package: SOP-8
Function list by types (Lineup is under review.)
Type
Overload
protection
ON threshold
voltage
Operation
compensation
Minimum
switching
frequency
Delay time of
restart
FA5640 Auto recovery
14V
Yes
No
25us
FA5641 Auto recovery
14V
Yes
25kHz
7.6us
FA5642 Auto recovery
10V
No
No
25us
* See 10. (9) “Other advice on designing” for details of the lineup without the minimum oscillating frequency function.
3. Outline drawings
SOP-8
0°～10°
1 PIN MARK
5.0±0.25
1.27
0.4±0.1
Fuji Electric Co., Ltd.
AN-064E Rev.1.1
April 2011
0.2±0.1
4
http://www.fujielectric.co.jp/products/semiconductor/