公开(公告)号：US20220341973A1

公开(公告)日：2022-10-27

申请号：US17236680

申请日：2021-04-21

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Yongjie CHENG ,  Ruoxin JIANG ,  Lingli ZHANG ,  John L. MELANSON

IPC: G01R19/10 ,  H03K17/687

Abstract: A system may include an output power stage driver comprising a plurality of parallel-coupled field-effect transistors and a current sensor comprising a sense field-effect transistor matched to a matched field-effect transistor of the plurality of parallel-coupled field-effect transistors and gate-coupled and source-coupled to the matched field-effect transistor. The current sensor may be configured to measure a reference voltage across the sense field-effect transistor, measure a sense voltage across the matched field-effect transistor, and determine a current through the output power stage driver based on a comparison of the reference voltage to the sense voltage.

公开(公告)号：US20220231603A1

公开(公告)日：2022-07-21

申请号：US17478433

申请日：2021-09-17

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Hasnain AKRAM ,  Graeme G. MACKAY ,  Lingli ZHANG ,  Ruoxin JIANG ,  Sakkarapani BALAGOPAL ,  Theodore M. BURK

IPC: H02M3/158 ,  H02M1/00 ,  H02M1/32 ,  H02M1/08

Abstract: A method for determining if an inductor coupled to a switching network has been electrically shorted may include applying a voltage across the inductor for a predetermined period of time, controlling an impedance in an electrical path of a voltage source generating the voltage and the inductor, sensing an inductor current through the inductor, comparing the inductor current with a predetermined current threshold, and determining whether the inductor has been electrically shorted based on the inductor current, the predetermined current threshold, and the predetermined period of time.