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Mr.Nixie
Visitor II
November 30, 2021
Question

TDA7293/94 on single supply voltage?

  • November 30, 2021
  • 1 reply
  • 1384 views

Is it possible to run e.g. 2 x TDA7293 in bridge configuration on a 24 VDC single supply voltage as it can be done on many other ICs by feeding the non invertig input with 1/2 supply voltage ?

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    1 reply

    Piranha
    Principal III
    December 1, 2021

    The chip cares only the relative voltage difference between it's connections. It doesn't care if that virtual ground is 0V, +12V or something else relatively to some other voltage. If you decouple/shift the audio input signal properly, it will work. And make sure it is muted and doesn't make a huge pop when powering ON.

    For these chips +/-12V is the minimum voltage. It will probably not be reliable or the parameters will significantly degrade below an absolute minimum supply voltage, if your power supply is not super stable/powerful.