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Phantom powering of DRV134

Jonas Gruska
Prodigy 30 points
Other Parts Discussed in Thread: DRV134, TLE2426

Hello everyone,

I was curious whether it'd be possible to power DRV134 using 48V phantom power, directly from the balanced connection.

I am assuming it'd be necessary to create some sort of split supply (maybe using virtual ground generator TLE2426?), or is there another solution? 

I was inspired by this article 0624.Mic_uses_phantom_pwr.pdf, where the balancing circuit is done by an opamp, and though that DRV134 may be even better solution for the job, since it has laser trimmer resistors for extra precession.

It is actually written by person from TI! :)

Thank you for any help,

Jonas

  • 0
    TI__Genius 9975 points

    Hello Jonas,

    It would be possible to derive a power supply scheme for the DRV134 from 48 V. Indeed, you must properly bias the GND terminal (pin 3 in the DIP/SO-8 and pin 5 in the SOL-16 package) of the DRV134 or the output signal will not be able to achieve its maximum swing.

    Please note that the TLE2426 is only rated up to 40 V so an intermediate lower voltage will be needed if you want to use the rail splitter. The other consideration is the maximum current it can sink (26 mA) which could be too low depending on the load connected to the DRV134 and whether it is used in differential mode or single ended mode.

    Hope this helps.
    Best regards,

    Jose

  • 0 in reply to Jose Duenas
    Prodigy 30 points

    Thank you Jose!

    So, what would be your suggestion in terms of proper split rails from single-supply 48V? Voltage divider with few capacitors? Zener based solutions?

    Thanks again,

    Jonas