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Voice modulation on 24V DC

Hello, could anobody recomend me some power-efficienty solution for voice modulation on 24V DC (2VRMS)? I had an idea to use DC-DC converter ADP2442 - as step-down from 30V to 24V with voice modulation connected to FB input (via capacitor). This solution did not work - seems the regulator has some internal compensation, voice signal has not been modulated on output. Output current sould be maximum 300mA. I would like to avoid solution with class-AB amplifier, I suppose there is possible some more "clever" solution. Thanks for advice

Radovan

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  • Radovan -- I'm glad it works with load, hope your final board does fine.

    David -- The LM317 would be nearly as efficient -- 6 volts drop out of 30 works out to 80 % vs. 90 % for the switching regulator.  I'm wondering if the ADP2442 would better handle any capacitance involved with the load, because its totem-pole output might sink current for a portion of each switching cycle if necessary -- which of course a LM317 cannot do.

         Best regards,

         Bob

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  • Radovan -- I'm glad it works with load, hope your final board does fine.

    David -- The LM317 would be nearly as efficient -- 6 volts drop out of 30 works out to 80 % vs. 90 % for the switching regulator.  I'm wondering if the ADP2442 would better handle any capacitance involved with the load, because its totem-pole output might sink current for a portion of each switching cycle if necessary -- which of course a LM317 cannot do.

         Best regards,

         Bob

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