Galaxy yh-250 v2.1 3.3v power supply circuit diagram

Published:2011/9/15 21:43:00 Author:Rebekka | Keyword: Galaxy , 3.3v power supply | From:SeekIC

It uses FETs q13, tl43l and the comparator Lm339 to form regulated voltage circuit. It is shown as the figure. The sawtooth signal of IC ka7500b's first pin ⑤ is sent by 10kω resistor to the comparator lm393's pins ②, ⑥ (lm393 is composed of the two comparators, in the circuit, the two comparators are connected in parallel as a comparator, that is the same-phase terminals ③ and ⑤ are connected, and inverting terminals ⑥ and ② are connected, and the output terminals ⑦ and ① are connected), and the pulse width output by pins ①, ⑦ of lm393 is decided by the potential of lm393's pins ③, ⑤.



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