An audio power amplifier circuit and its mode control circuit

Abstract

The invention provides an audio power amplifying circuit and a mode control circuit thereof. The mode control circuit comprises a control signal detection unit, a counting unit, a control decoding unit and a mode control unit, wherein the control signal detection unit comprises a single control port for receiving a pulse control signal; the control signal detection unit is used for detecting the pulse control signal; when the control signal detection unit detects that a duration of a first level of the pulse control signal is greater than a preset time threshold, the counting unit is reset; after the counting unit is reset, the counting unit accumulates count values once and outputs the count values to the control decoding unit once when the control signal detection unit detects that the pulse control signal jumps from the first level to a second level once; and the control decoding unit is used for decoding the count values in order to output mode control instructions corresponding to the count values. Compared with the prior art, the model control circuit provided by the invention has the advantage that circuit application peripheries can be reduced.

Description

【Technical field】 [0001] The invention relates to the field of audio power amplifying circuits, in particular to an audio power amplifying circuit and a mode control circuit thereof. 【Background technique】 [0002] With the development of audio power amplification technology, there are more and more working modes of audio power amplification circuits. In the prior art, each working mode of the audio power amplifier circuit requires an independent control port, which requires more peripheral lines for control in application, which increases the related cost of product application, and the number of control ports of the chip increases. It will increase the cost of IC (Integrated Circuit, integrated circuit) chip and packaging cost, resulting in high cost of the whole application solution. At present, most product designs are limited by cost pressures and only select part of the mode control, which leads to insufficient flexibility in the product application process, and also ...

AI Technical Summary

Problems solved by technology

In the prior art, each working mode of the audio power amplifier circuit requires an independent control port, which requires more peripheral lines for control in application, which increases the related cost of product application, and the number of control ports of the chip increases. It will increase the cost of IC (Integrated Circuit, integrated circuit) chip and packaging cost, resulting in high cost of the entire application solution

At present, most product designs are limited by cost pressures and only select part of the mode control, which leads to insufficient flexibility in the product application process, and also occupies more ports, which increases the production cost and application cost of the product.

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