TPA3255: Method used to determine PFFB values.

Jerry Gorman

Part Number: TPA3255

Tool/software:

I was curious about how they went about determining the PFFB values. I have my own design of the TPA3255 amplifier board. I did include locations for the PFFB circuitry. I have used the amplifier boards for some time but I decided to try adding the PFFB components. This did work but at higher output levels oscillation did occur. I am using a different input opamp but not sure how much that would have to do with it. I also notice the PFFB values for the TPA3255 are fairly different from the other TI amps which I thought was a bit odd.

2 months ago

0 Jesse Ji 2 months ago

TI__Mastermind 20351 points

hi Jerry

about the pffb, you can refer below link for reference.

https://www.ti.com/lit/an/slaa788a/slaa788a.pdf?ts=1753666197457&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTPA3255

thanks

jesse

0 Jerry Gorman 1 month ago in reply to Jesse Ji

TI__Prodigy 320 points

Hi Jesse,

I have seen and read that document but I don't think it offers much to answer my questions. Did we loose all knowledge on how they came about the PFFB values in the tables for the different amplifiers and how or why the input opamp makes a difference?

Regards,

Jerry G

+1 Jesse Ji 1 month ago in reply to Jerry Gorman

TI__Mastermind 20351 points

hi Jerry

that document is all what we have now.

you mentioned that the op amp you used is different.

is that mean the paras for c_op and R_op_fb be changed?

all others be kept the same with our recommendation?

thx

jesse

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TPA3255: Method used to determine PFFB values.