Patent ID: 9356594
Filing Date: 2016-05-31
CPC Classification: G05F,H03K

Claim Text:
1. A switched-mode power supply comprising: a pulse width modulation (PWM) control unit generating a predetermined clock signal and varying pulse widths of the clock signal depending on a load to provide a path switching signal; a clock counter counting the clock signal to generate a control signal; a current source generating a predetermined current; a current mirroring circuit unit connected to a first operating voltage terminal, and having a plurality of upper side current mirroring units respectively mirroring the current from the current source to create a current having a predetermined amplitude; a first current adjusting unit individually selecting a portion of the plurality of upper side current mirroring units according to the control signal; and a path switching circuit unit switched according to the path switching signal so as to select a charging path between the first current adjusting unit and a power switch or a discharging path between the power switch and the ground.