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TPA3251EVM: Clipping detection or overtemperature warning (CLIP_OTW) at very low output power

Part Number: TPA3251EVM


The warning LED CLIP_OTW goes ON at very low input and output power. I have run several tests with different loads and the results are the same. With a 4 Ohm load the clipping warning raises with an input signal of 900 mVpp and the output is 12 Vrms and 3A. The input signal is a 1KHz sin from an AWG and the TPA is connected to a 200 W power supply. The board is supplied with 20V and 10A current limit. The supply current never exceeds 4.5 A. The device is operating in BTL mode.

I have not tried to go to higher power when the CLIP_OTW warning appears to avoid damage. Please advise if this is a normal operation setup and if it is safe to operate the device when the CLIP_OTW warning is ON so to go beyond 200 W.


Load (Ohm) Vin (mV) Vout (Vrms) I (A) Pout (W)
3 900 12 4 48
5 900 12 2 24
12 900 12 1 12
16 500 12 0.7 8.4

Min. Input Voltage (Vin) that makes CLIP_OTW go ON.