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BUY TOP103YN https://www.utsource.net/itm/p/1110148.html
Analog IC
Description: TOP103YN is a three-terminal, fixed-frequency, off-line, current-mode, PWM controller IC. Features: Operating Voltage Range: 6V to 40V Low Start-up Current: 0.5mA Internal Slope Compensation Internal Soft-Start Over-Current Protection Over-Voltage Protection Under-Voltage Lockout Thermal Shutdown Short-Circuit Protection Low Operating Current: 5mA Low Standby Current: 0.5mA Applications: Switching Power Supplies DC/DC Converters Battery Chargers Motor Control (For reference only)