AC adapter circuit
Shown is the AC adapter circuit of a portable digital product , which converts AC 220V voltage into DC low voltage. This circuit adopts
the drilling structure of a switching power supply. The LD7575 is a switching oscillation integrated circuit . After it starts to oscillate, ⑤ focuses on outputting PWM switching pulses to drive
the switching tube Ql. After Ql works, it provides pulse current to the primary winding of the switching transformer Tl. Tl secondary output well outputs +5 v
voltage after rectification and filtering ,
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