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1.Description
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
https://www.utsource.net/ic-datasheet/fa5640n-1904405.html