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BUY TOP245PN https://www.utsource.net/itm/p/482053.html
IC SW OFF-LINE PS 22/30W 8DIP
Description: The TOP245PN is an off-line switcher IC designed for use in an isolated or non-isolated flyback converter for low power AC/DC and DC/DC applications. Features: Constant frequency, critical conduction mode operation Internal oscillator frequency (nominally 70 kHz) Internal cycle-by-cycle current limiting Internal thermal shutdown and UVLO Zero current and zero voltage switching Precision 3.2 V precision reference Leading edge blanking (LEB) Overvoltage protection (OVP) SO-7 package with power dissipation >3 W Applications: Low power AC/DC and DC/DC converters Telecom and networking systems LED lighting Set-top boxes and display monitors (For reference only)