I am planning to build a DAC with TPS7A47/33 combo for the +- rails of the output stage. (for reference, this would be my second diy DAC and my first with a proper external output stage). I have some experience building devices powered by USB-PD, and was thinking.... wouldn't it be easier to just use the 20V the USB can give me and take that directly to the TPSs and then go down buck/LDO to the rest?
I could not find many comments on USB-PD powered DACs, is there anything i am overseeing?
thanks!
I could not find many comments on USB-PD powered DACs, is there anything i am overseeing?
thanks!
In any way you'll need a negative rail before TPS7A33. You can get it by many ways, for ex. TPS6513x and others without 20V PD supply.
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