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TPA3251: audio input

Part Number: TPA3251

Hi Team,

My customer is using tpa3251. When tpa3251 is single ended input, the output power of tpa3251 is too small to reach the actual required output power. When tpa3251 is a differential input, the output power is ok. Why can't tpa3251 use single ended input (negative audio input connected to GND)?

Best regards,