“M51995A is the primary switching regulator controller which is especially designed to get the regulated DC voltage from AC power supply. This IC can directly drive the MOS-FET with fast rise and fast full output pulse.Type M51995A has the functions of not only high frequency OSCand fast output drive but also current limit with fast response and high sensibility so the true “”fast switching regulator”” can berealized.It has another big feature of current protection to short and overcurrent,owing to the integrated timer-type protection circuit,if few parts are added to the primary side.The M51995A is equivalent to the M51977 with externally resettable OVP(over voltage protection) circuit.
“