TPA3251: Power Supply Current Rating Requirements..

Hi Leo,

It depends on the application and configuration you have the device in.  

The TPA3251 datasheet on page 7 shows the current consumed by the device for 36VDC and 12VDC when in reset and 50% duty cycle.  The current consumption for 12VDC for 50% duty cycle shows I_VDD=40mA and then for each full-bridge I_GVDD=25mA.  This isn't likely to increase greatly with different duty cycles, however the current from 36VDC (PVDD) will be drastically different depending on the input signal but at 50% duty cycle the datasheet says 12.5mA.

Finally for the 3.3VDC you can actually use the DVDD pin on the TPA3251.

Hope this helps and good day,

Robert

Hi Sir Robert,

So if I configure my power supply like these for a configuration of 175W Stereo BTL 10% THD+N:

Is this possible?

+12 Volts DC @ 500mA

+3.3 Volts DC @ 200mA

+36 Volts DC @ 18A

Thanks and Good Day,

Leo

Hi Sir Robert,

Thanks. I plan to build this amplifier with an MSP432 controlling an Audio DSP with Graphical LCD display.

Best Regards,
Leo

Hi Leo,

I am always happy to hear when a customer is using other TI components in their circuits. If you have any other questions or possible issues please don't hesitate to ask.

Best Regards,
Robert