CIRCUIT AD METHOD TO COMPENSATE FOR EQUIVALENT SERIES INDUCTANCE (ESL) EFFECTS IN A BUCK REGULATOR

摘要

A fast transient switching voltage regulator includes a reference signal generator to provide a reference in a feedback path to control switching. The reference signal generator is operative to incorporate a voltage offset into the reference signal timed with the control pulses used to control the switching. The voltage offset moves the reference signal out of the way of pulses introduced in the feedback path due to capacitance ESL in the output capacitor of the switching voltage regulator.

主权项

1. A circuit comprising
a first input terminal for a connection to a power source; a second input terminal for a connection to a reference potential; an output terminal for a connection to a load; an inductive element connected to the output terminal; a capacitive element connected between the output terminal and the second input terminal; a first switch connected between the first input terminal and the inductive element; a second switch connected between the inductive element and the second input terminal; a reference generator operable to produce a reference signal; and a pulse width modulator (PWM) module having an input connected to the output terminal and an input connected to the reference generator, the PWM module operable to produce a pulse waveform to drive the first and second switches, the reference generator further operable to include a voltage offset in the reference signal, the voltage offset varying synchronously with the pulse waveform from the PWM module.