Patent ID: 7990118
Filing Date: 2011-08-02
Classification: H02M,Y02B

Abstract:
1. A switching regulator, comprising: an oscillator having an output terminal, the oscillator being configured for generating a wave having a constant frequency; a PWM logic controller having a first input terminal, a second input terminal and an output terminal, the first input terminal of the PWM logic controller electrically connecting to the output terminal of the oscillator, the PWM logic controller generating a first control voltage according to the wave generated from the oscillator; an inductor; a capacitor electrically connected to the inductor, the inductor and the capacitor composing an LC filter, a first node being defined therebetween, and the first node being used as an output terminal of the switching regulator for outputting an output voltage; a driver; a switch interconnecting the inductor with a power supply, the driver interconnecting the output terminal of the PWM logic controller with the switch; a current sense amplifier having an input terminal and an output terminal, the input terminal of the current sense amplifier electrically connecting to the inductor and configured for sensing a current passing through the switch and the inductor; and a minimum power pulse width generator having a first input terminal, a second input terminal and an output terminal, the first input terminal thereof electrically connecting to the output terminal of the current sense amplifier, the second input terminal thereof electrically connecting to the output terminal of the oscillator, the output terminal thereof electrically connecting to the second input terminal of the PWM logic controller, the current sense amplifier and the minimum power pulse width generator composing a first feedback loop for generating a first feedback signal to the PWM logic controller such that the PWM logic controller generates a second control voltage according to the first feedback signal.