公开(公告)号：US09590574B1

公开(公告)日：2017-03-07

申请号：US14176681

申请日：2014-02-10

Applicant: Cirrus Logic, Inc.

Inventor： Shahrzad Naraghi ,  Johann Gaboriau ,  John L. Melanson

IPC: H02M3/158 ,  H03F3/217 ,  H03F1/26 ,  H03F3/181

CPC classification number: H03F3/217 ,  H02M1/38 ,  H02M3/1588 ,  H02M2001/0029 ,  H03F1/26 ,  H03F3/181 ,  Y02B70/1466

Abstract: An audio switching power amplifier having an output with controlled-slope transitions maintains efficiency while avoiding uncontrolled non-overlap intervals during switching transitions. A pair of transistors forming a half-bridge that supplies an output signal at an output terminal of the amplifier are operated so that neither transistor is fully on during an overlap time period. A current source provides an output current to the output terminal during the non-overlap time period to control the output voltage while changing the transistor that conducts the output current from a first one of the pair of transistors to a second one of the pair of transistors. The current source may be provided by operation of one of the transistors in a current source configuration. The voltage of a gate of one of the transistors can be compared with a threshold to provide an indication of the current.

Abstract translation: 具有受控斜率转换的输出的音频开关功率放大器保持效率，同时在切换转换期间避免不受控制的非重叠间隔。 形成在放大器的输出端提供输出信号的半桥的一对晶体管被操作，使得在重叠时间段期间两个晶体管都不会完全导通。 电流源在非重叠时间周期期间向输出端提供输出电流，以在改变将输出电流从该对晶体管中的第一晶体管导通到该对晶体管中的第二晶体管的晶体管时控制输出电压 。 可以通过当前源配置中的晶体管之一的操作来提供电流源。 可以将晶体管中的一个的栅极的电压与阈值进行比较以提供电流的指示。