POWER CONVERTER USING HYSTERETIC BOOST ARCHITECTURE AND METHOD THEREFOR

摘要

In one form, a control circuit is adapted for use with a power converter having an inductor and a switch switching the inductor in response to a switching signal to regulate an output voltage of the power converter. The control circuit includes a slow feedback path, a fast feedback path, an integrator, a comparator, and a drive circuit. The slow feedback path provides a ripple signal in response to an average value of the output voltage. The fast feedback path provides a feedback signal in response to the output voltage. The integrator provides an error signal in response to a sum of the feedback signal and the ripple signal. The comparator provides a comparison output signal in response to a comparison of the error signal and a threshold voltage. The driver circuit provides the switching signal in response to the comparison output signal.

主权项

1. A power converter using a hysteretic boost architecture comprising:
an inductor having a first terminal for receiving an input voltage, and a second terminal; a low-side switch having a first terminal coupled to the second terminal of the inductor, a second terminal coupled to a power supply voltage terminal, and a control terminal for receiving a switching signal; a rectifier having a first terminal coupled to the second terminal of the inductor, and a second terminal for providing an output voltage; an output capacitor is coupled between the second terminal of the rectifier and the power supply voltage terminal; and a control circuit having an input coupled to the second terminal of the rectifier, and an output coupled to the control terminal of the switch for providing the switching signal, wherein the control circuit provides the switching signal using hysteresis based on both a slow feedback path and a fast feedback path.