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TPS65987D: sometimes saw overcurrent protection feature didn't activate

Guru 29720 points
Part Number: TPS65987D

Hi Team,

My customer is evaluating overcurrent protection feature with TPS65987EVM (Source).
He sometimes saw overcurrent protection feature didn't activate when follows the sequence below.

1) connect TPS65987EVM to PD Sink then 20V VBUS is applied *Source Capability is 20V / 1.5A
2) put resistive load (8Ω) on PD Sink output
3) overcurrent protection feature activates and TPS65987D continues error recovery 
4) press reset button of TPS65987EVM

Then repeat 4) -> 3) -> 4) -> 3) -> ..., he sometimes saw overcurrent protection feature didn't activate and 2.5A (=20V / 8Ω) flows continuously.

Is it possible case for TPS65987D?

Best Regards,
Yaita