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BUY TOP233YN https://www.utsource.net/itm/p/1110120.html
Analog IC
Description: The TOP233YN is a fixed frequency current-mode PWM controller IC with an internal oscillator. It is designed for off-line and DC-to-DC converter applications. Features: Internal Oscillator Low Start-up and Operating Current Under Voltage Lockout Thermal Shutdown Cycle-by-Cycle Current Limiting Low Cost Low External Component Count Applications: Off-line and DC-to-DC Converters Switch Mode Power Supplies Battery Chargers (For reference only)