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TPA3244: Expected gain

Part Number: TPA3244
Other Parts Discussed in Thread: TPA3250D2EVM, TPA3250

Tool/software:

Audio team,

Our customer took a TPA3250D2EVM and modified it by replacing the TPA3250 with a TPA3244.  

Here is the configuration:

- 30V supply

- BTL mode (using only one input)

- Differential inputs.  Each input is a 134Hz sine wave, 0.6V peak to peak, so 1.2V total on the input

- the load is a 2 Ohm resistive load

He measured 9.4V peak to peak across the load on the output.

He was expecting to see a fixed gain of 10.  Is that right?  If so, why is he not seeing it?

Thanks,

Darren