SYSTEM AND METHOD FOR ADAPTIVE CURRENT LIMIT OF A SWITCHING REGULATOR

摘要

An adaptive current limiter including a conversion network and an amplifier network developing an adaptive current limit signal for use by a switching regulator to limit peak current through an inductor of the switching regulator. The switching regulator develops a pulse control signal for controlling switching of current through the inductor to convert an input voltage to an output voltage. The conversion network provides a limit value by applying a duty cycle of the pulse control signal to a reference value. The amplifier network is configured to develop the adaptive current limit signal based on the limit value. The conversion network may multiply the reference value by the duty cycle to develop the limit value. The amplifier network may include a current source providing a fixed reference current to an amplifier to establish a minimum level of the adaptive current limit signal.

主权项

1. An adaptive current limiter for a switching regulator, wherein the switching regulator develops a pulse control signal used for controlling switching of current through an inductor to convert an input voltage to an output voltage, the adaptive current limiter comprising:
a conversion network which is configured to provide a limit value based on applying a duty cycle of the pulse control signal to a reference value; and an amplifier network which is configured to provide an adaptive current limit signal based on said limit value, wherein said adaptive current limit signal is configured to be used by the switching regulator to limit peak current through the inductor.