TPA3255EVM: Determining capacitor and inductor values for LC filter on PBTL configuration

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Part Number: TPA3255EVM
Other Parts Discussed in Thread: TPA3255

Dear team,

Our team is implementing a TPA3255 Class D Amplifier for an amplification application involving sinusoids. We plan to use PBTL in order to double power output and reduce temperatures, however it is difficult to find a reliable method to calculate the capacitances and inductances for the LC filter network in a PBTL configuration. Our team plans to design for a corner frequency of 100kHz. To sum up, is there a ‘cookbook’ method for calculating capacitances and inductances of the LC filter in a PBTL configuration for a given resistive load?

Best regards,
William

over 1 year ago

0 Jesse Ji over 1 year ago

TI__Genius 11300 points

Hi William

i think below link should be able to help you.

https://www.ti.com/lit/an/slaa701a/slaa701a.pdf

also there is a tool which can help you calculate the parameter.

http://www.ti.com/lit/zip/slac729

thanks.

jesse

0 Links over 1 year ago in reply to Jesse Ji

TI__Intellectual 2145 points

Dear Jesse,

Thank you for the pdf document and excel calculator. However, it seems the calculator only gives values for BTL, not PBTL. Or is it valid for both topologies of Class D Amplifiers? Also, is there a section in the pdf that I may have missed going into further detail on how to select capacitors and inductors for PBTL topology on the TPA3255?

Best regards,
William

0 Shadow He over 1 year ago in reply to Links

TI__Mastermind 32120 points

Hi William

The calculation is the same for both BTL and PBTL, no big difference for this two working mode.

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TPA3255EVM: Determining capacitor and inductor values for LC filter on PBTL configuration