公开(公告)号：US20220302837A1

公开(公告)日：2022-09-22

申请号：US17512842

申请日：2021-10-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Song GUO ,  Saurav BANDYOPADHYAY

IPC: H02M3/158 ,  H02M1/00

Abstract: A current sense circuit includes a sense amplifier, a current mirror circuit, a resistor, a low-pass filter, and a capacitor. The sense amplifier is adapted to be coupled to a switching transistor of a DC-DC converter. The current mirror circuit is coupled to the sense amplifier, and is configured to generate a sense current proportional to a current flowing through the switching transistor. The resistor is coupled to the current mirror circuit, and is configured to generate a sense voltage based on the sense current. The low-pass filter is coupled to the resistor, and is configured to average the sense voltage over an averaging interval. The capacitor is coupled to the resistor, and is configured to store the sense voltage in a blanking interval that precedes the averaging interval, and provide a compensation current in the averaging interval.