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Original question:

TPA3251: tpa3251, PFFB and pll mode

TPA3251: Output ZOBEL settings

Florent charles
Prodigy 100 points
Part Number: TPA3251
Other Parts Discussed in Thread: TPA3255

Dear,

I'm trying to understand which value I have to use for the output "zobel" filter ?

In the TPA3251 EVM, Cz = 1uF / Rz = 3.3ohm, cutoff Freq

In the TPA3251 datasheet, Cz = 10nF / Rz = 3.3ohm

In the TPA3255 slaa78 application notes, Cz = 220nF / Rz = 1ohm

In the doc attached, Cz = 1uF / Rz = 2.7ohm

Address of the attached doc:

www.google.com/url

Could you help me understand which one is the correct?

Best regards FlorentTPA3251 - Post Filter Feedback (PFFB).pdf

  • 0
    TI__Mastermind 20830 points

    Hi Florent,

    The EVM components were placed there as place holders. As a default I would recommend using the values in the application note since we ran PFFB tests with those values so we can guarantee PFFB should work with those components. 

    Best Regards,

    Robert Clifton