BUY TOP234PN https://www.utsource.net/itm/p/5321812.html
Design Flexible, EcoSmart, Integrated Off-line Switcher
Description: TOP234PN is a 7-pin DIP integrated circuit (IC) designed for use in off-line and DC-to-DC switch-mode power supplies. Features: Low start-up current Internal thermal shutdown Internal current limit Low operating current Low standby power dissipation Low cost High efficiency Applications: Switch-mode power supplies Battery chargers DC-to-DC converters Off-line converters SMPS for consumer electronics (For reference only)