Power regulator and controlling method thereof

摘要

Methods and circuits related to power regulation are disclosed. In one embodiment, a power regulator for converting an input electrical signal to an output electrical signal to supply power to a load, can include: (i) a power stage having switching devices and a filter; (ii) a regulation signal generator for the switching devices that includes a feedback circuit and a PWM, the feedback circuit receiving an output signal from the power stage, the PWM receiving an output from the feedback circuit, and generating a PWM control signal; (iii) a constant time generator receiving the PWM control signal and generating a constant time signal based on the PWM control signal duty cycle; and (iv) a logic/driving circuit receiving the PWM control signal and the constant time signal, and controlling operation of the switching devices to modulate the output signal from the power stage, and maintaining a pseudo constant operation frequency.

主权项

1. A power regulator for converting an input signal to an output signal to supply power to a load, said power regulator comprising:
a) a power stage having a switching device and a filter, wherein said power stage is configured to generate said output signal; b) a regulation signal generator for said switching device, wherein said regulation signal generator is configured to receive feedback from said output signal, and to generate therefrom a pulse width modulation (PWM) control signal; c) a constant time generator configured to receive said PWM control signal, and to generate a constant time signal based on a duty cycle of said PWM control signal; and d) a logic/driving circuit configured to receive said PWM control signal and said constant time signal, and to control operation of said switching device to modulate said output signal, and to maintain a pseudo constant operation frequency of said switching device.