LM5160DNTFBKEVM: why VIN = 5V is not ok at SCP result compared to VIN = 6V

Dear TIer,

We are evaluating LM5160 for new projects. However, we find a over current (4.87A) issue at EVM while testing SCP when VIN=5V.

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Configuration and Preparation before SCP test

1. Take  LM5160NTFBKEVM
2. Remove R10 to let EVM support VIN(min) = 4.5V
3. Modify Rfb to config Vo1 (primary side) = 2.5V.

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Issue : Abnormal current occurs, out of current limit spec shown in LM5160 datasheet, Ipeak = 4.87A 

Conditions: Vin = 5V, short Vo1 to GND in purpose

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Benchmark case :  Ipeak = 2.4A within current limit spec, ok to me

Conditions: Vin = 6V, short Vo1 in purpose

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