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TPA3255: has fault of OTE with low frequency

Part Number: TPA3255

Hi sir,

I have designer an amplifiers circuit with TPA3255.

I meet a issue that  system will has a fault(OTE) after working 15s when input signal frequency is 1K. However system can work 20 mins when input signal is 10K.

Power supply: 48v;

Input sine Vpp: 3.4V;

Output sine Vpp: 44V.

Thanks!

Hao