Part Number : M51977FP
Function : Switching regulator control
Manufacturers : MITSUBISHI ELECTRIC
Pinouts : 
Description :
Mitsubishi IC type M51977P, FP are the off-line primary PWM controller which are especially designed for SMPS to get the regulated DC voltage from AC power supply.
Datasheet PDF Download
Other data sheets within the file : M51977FP, M51977P