AMP2 channel 2 don't work

[capitanopeppe]

I have some problem whit AMP2. After mounting i can calibrate offset of the channel 1 but in channel 2 the offest is constant 3V. I measure the voltage at pin of C17 bootstrap capacitor of channel 2 and it isn't 10V but 0.5V and in the channel 1 is 10/11V. the voltage in VN10 is correctly 11,5V ...I don't find phisical error, it's possible that during mounting the TP2350 broke..?

[Jan]

If the bootstrap cap voltage is 0, its because there is no switching on the output. Bootstrap cap is charged from the output when it swings low. So the problem is probably not te bootstrap but the output. If you have a scope or frequency meter, you could try measuring if you have any 600kHz switching from the TC2001 to the TP2350. You should have two complementary 5V switchin signals there for each channel. If not, then the problem is more likely the TC2001.

[capitanopeppe]

Tanks jan.. i have found my problem.. did not bootstrap circuit but not was contact on 20k resistor of pull-down OCD2 (cold welding) that made to go the circuit in protection for overcurrent. Council to all to control every smd components as soon as it comes knit.