Schaltkreis, Entsprechende Vorrichtung und Verfahren

Details

Veröffentlichungs-Nr.

EP4293908

Aktenzeichen

EP23175269

Anmeldetag

25. Mai 2023

Veröffentlichung

25. Juni 2025

Erteilung

25. Juni 2025

Rechtsraum

EP

IPC

H03K17/0812H03F3/217H03K17/0814H03K17/16

Abstract

A switching circuit for use, e.g., in class D switching audio amplifiers comprises first and second half bridges with output nodes (Vout1, Vout2) to supplying an electrical load (L) via respective filter networks (Lo1, C1; Lo2, C2). During alternate switching sequences a first pair of transistors comprising the high-side transistor in one of the half bridges and the low-side transistor in the other of the half bridges is switched to a nonconductive state, and a second pair of transistors comprising the high-side transistor in the other of the half bridges and the low-side transistor in the other of the half bridges is switched to a conductive state. A current flow line is provided by an inductance (Laux) between the output nodes (Vout1, Vout2) with first and second capacitances coupled with the output nodes (Vout1, Vout2) of the half bridges. In a first, medium-high power operation mode (1 > Tshort(ZSL)), a control circuitry (12) switches the first and second switches to the conductive state between switching the first pair of transistors to a nonconductive state and the second pair of transistors to a conductive state. In a second, low power or quiescent operation mode (0 > Tlong(ZSL)), the control circuitry (12) refrains from switching the first and second switches to the conductive state, e.g., by applying a longer delay (ZSL Delay Control) to the switching command.

Anmelder

Firma

STMicroelectronics S.r.l.

Land

🇮🇹 Italien

Fachgebiete