LOW VOLTAGE POWER SUPPLY.

摘要

A buck regulator for converting an input DC voltage, V⁺, into an output DC voltage level includes a coupled inductor for outputting the DC voltage level, and an error amplifier for sensing an error in the outputted DC voltage level and a pulse width modulator (PWM) providing a pulse waveform having a duty cycle responsive to the error. Also, included are a V⁺ voltage driver for outputting the V⁺ voltage level responsive to the pulse waveform, and a super voltage driver for outputting a super voltage level, Vss, responsive to the pulsed waveform, wherein the super voltage level is higher than the V⁺ voltage level. The outputted super voltage level is complementary to the outputted V⁺ voltage level. Also included are dual MOSFETs, which have gates for, respectively, receiving the super voltage level and the V⁺ voltage level. The dual MOSFETs drive the coupled inductor for outputting the DC voltage level. Furthermore, a pulse shaper is coupled between the PWM and the voltage drivers for forming a sharp pulse having a rise time that is faster than a rise time of the pulse waveform. The sharp pulse is provided as a control signal for activating the voltage drivers.