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TPS65140 VO1 voltage drop during -40 degree

Dear sir,

I find an voltage drop on VO1 when the ambient temperature is down to -40 degree.(only VO1 rail) 

I have modified compensation component, Cin, and Cout.  Also check the component working temperature.

But this issue still happened.

Did you have any idea for this case?

Any suggestion is useful for me.

Thanks for your help!

Regards,

Ben