The PD0/PWM0 pin output is connected in series with a resistor to an NPN transistor (C945) to control whether the PNP transistor (2SB772) is turned on. When the PWM0 output is high, both NPN and PNP are in the on state, and the 5V voltage pair is on. Inductive charging. When the PWM output is low, both NPN and PNP are in a non-conducting state, the 5V voltage does not charge the inductor, and the inductor is discharged through the Schottky diode (1N5819). When controlling the Duty of the PEM output, the current energy stored in the inductor can be maintained at a certain level, thereby performing constant current control.
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