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CLASS-D AUDIO AMPLIFIER COMPRISING A CIRCUIT FOR READING A CURRENT SUPPLIED BY THE AMPLIFIER TO THE LOAD, AND CORRESPONDING READING METHOD
CLASS-D AUDIO AMPLIFIER COMPRISING A CIRCUIT FOR READING A CURRENT SUPPLIED BY THE AMPLIFIER TO THE LOAD, AND CORRESPONDING READING METHOD
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机译:D类音频放大器,包括用于读取由放大器向负载提供的电流的电路,以及相应的读取方法
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摘要
A class-D audio-amplifier apparatus including a circuit (50) for reading a load current supplied by said amplifier to a load, said amplifier comprising a final stage, which includes a full-H bridge comprising a first half-bridge and a second half-bridge; said circuit (50) being configured for estimating said load current through reading of a current (IOUTP, IOUTM) supplied by at least one power transistor (13b, 23b), by measuring a drain-to-source voltage (VDSLP) thereof during an ON period. According to the invention, said apparatus comprises a sensing circuit (50) connected for detecting a first drain-to-source voltage (VSP) from a transistor (13b) of the first half-bridge (12) and a second drain-to-source voltage (VSM) from a corresponding transistor (23b) of the second half-bridge (22), said sensing circuit (50) comprising: a module (51) for computing a difference between said first detected drain-to-source voltage (VSP) and said second detected drain-to-source voltage (VSM); and a module (53) for performing an averaging operation on said difference to obtain a sense voltage value (VSENSE) to be supplied to an analog-to-digital converter (54).
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机译:D类音频放大器设备,包括用于读取由所述放大器提供给负载的负载电流的电路(50),所述放大器包括末级,该末级包括具有第一半桥和第二半桥的全H桥半桥所述电路(50)被配置用于通过读取由至少一个功率晶体管(13b,23b)提供的电流(I OUTP Sub>,I OUTM Sub>)来估计所述负载电流。通过在导通期间测量其漏极至源极电压(V DSLP Sub>)。根据本发明,所述设备包括感测电路(50),其被连接以检测来自第一半桥(12)的晶体管(13b)的第一漏极-源极电压(V SP Sub>)。 )和来自第二半桥(22)的相应晶体管(23b)的第二漏极-源极电压(V SM Sub>),所述传感电路(50)包括:模块(51) )用于计算所述第一检测到的漏极-源极电压(V SP Sub>)与所述第二检测到的漏极-源极电压(V SM Sub>)之间的差;模块(53),用于对所述差进行平均运算,以获得将被提供给模数转换器(54)的感测电压值(V SENSE Sub>)。
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