A driver circuit 1200 has a first switching driver 401-1 and a second switching driver 401-2 for driving a transducer 104 in a bridge-tied-load (BTL) configuration, each switching driver having a respective output stage for controllably switching a respective driver output node between high and low switching voltages with a controlled duty cycle. Each switching driver is operable in a plurality of different driver modes, wherein the switching voltages are different in said different driver modes (e.g. Table 1). A controller 1201 controls the driver mode of operation and the duty cycle of the switching drivers based on the input signal. The controller is configured to control the duty cycles of the first and second switching drivers within defined minimum and maximum limits of duty cycles, and to transition between driver modes of operation when the duty cycle of one of the switching drivers reaches a duty cycle limit (Fig.13, 1301, 1302). The controller implements the transition by changing the driver mode of one switching driver and varying its duty cycle to the other duty cycle limit, and by maintaining the driver mode of the other switching driver and varying its duty cycle to maintain the differential output signal magnitude.


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    Title :

    Driver circuitry and operation


    Publication date :

    2025-02-05


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English



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