BUY KA3842A https://www.utsource.net/itm/p/11223712.html

The KA3842A is a monolithic integrated circuit designed for use as a fixed frequency pulse width modulation control circuit. It is specifically designed for switching power supplies, DC-DC converters and other power control applications. Features: Low external parts count High voltage capability Internal oscillator Adjustable duty cycle Internal temperature compensation Internal current limit High speed switching Internal soft start Internal frequency compensation Applications: Switching power supplies DC-DC converters Motor control Lighting control Battery chargers Automotive applications (For reference only)