BUY UC2843B https://www.utsource.net/itm/p/287342.html
High Performance Current Mode Controllers
Description: The UC2843B is a high performance current mode PWM controller. Features: Operating voltage range: 4.5V to 18V Internal oscillator with adjustable frequency Current mode control Undervoltage lockout Overcurrent protection Thermal shutdown Soft start Output voltage regulation Frequency foldback Applications: Switch mode power supplies DC-DC converters Battery chargers Motor control (For reference only)