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BUY UC3855BDW https://www.utsource.net/itm/p/443451.html
Power Factor Controller
Description: The UC3855BDW is a high performance fixed frequency current mode PWM controller. It is specifically designed for Off-Line and DC-to-DC converter applications offering the designer a cost effective solution with minimal external components. Features: Internal Start-up Circuit Internal Soft Start Internal Slope Compensation Internal Over-Current Protection Internal Thermal Shutdown Internal Under-Voltage Lockout Internal Oscillator Internal Regulator Low Start-up Current Low Operating Current Low Standby Current Low Profile SOP-20 Package Applications: Off-Line Converters DC-to-DC Converters Switching Power Supplies Uninterruptible Power Supplies Battery Chargers (For reference only)