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TAS2110: Overcurrent trips at high volume with no load

Part Number: TAS2110

TAS2110 works OK at lower volume levels, but overcurrent trips (and auto resets repeatedly) when output is more than ~2.5V RMS with a sine input. It does this with or without a speaker load. It works normally again when volume is turned back down. We need > 2W output, but this is tripping at 1.6W with a 4 ohm speaker.

VDD = 1.8, VBAT = 3.6, PVDD = 7.5V. Boost is disabled.