The step-down switch power supply circuit

Published:2011/6/23 0:57:00 Author:qqtang | Keyword: step-down, switch power supply | From:SeekIC

The application circuit of the step-down switch power supply circuit is shown in the circuit. When the switch VT1 is conducting, the diode VD1 is blocked, the input rectified current is charging C with the help of VT1 and L, this circuit increases the energy storage of inductor L. When the switch pipe VT1 is blocked, L is inducting a voltage whose left side is passive and right side is positive, by releasing the energy in L with the help of RL and VD1, the DC voltage is maintained. Whether the voltage is high or low is decided by the pulse width on the basic electrode of VT1. This circuit needs a few components.



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