BUY UC3842AD8 https://www.utsource.net/itm/p/323449.html
Current Mode PWM Controller
Description: The UC3842AD8 is a high performance current mode PWM controller. It is specifically designed to meet the requirements of off-line and DC to DC converter applications with minimal external components. Features: * Internal Undervoltage Lockout with Hysteresis * Internal Slope Compensation * Low Start-up Current * Programmable Oscillator * Programmable Soft-Start * Programmable Maximum Duty Cycle * Programmable Output Dead Time * Low Output Saturation Voltage Applications: * Switching Regulators * Off-line Converters * DC to DC Converters * Motor Controls * Battery Chargers (For reference only)