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OPA569: Unexplained behavior of The Amplifier;s Current Flag and Output

Part Number: OPA569

Hello,

I'm using the OPA569 as part of a TEC driver. One side of the TEC is OPA569, other is an half-bridge. The driver can both heat or cool, switching the current direction, using the half bridge.

The amplifier is in unity gain configuration, its enable input is connected to the thermal flag output.

The design is working, but I found two issues I don't understand:

1) Current limit flag behavior – On occasions, current limit flag keeps showing limit event, although amplifier's current is almost zero

2) Output unrelated to input – Also happens from time to time, the amplifier stops following the input, output stays low when input is high. No thermal event when this happens.

Please tell if you encountered such issues or know what may cause this behavior.

Thanks,

Ron