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LM5069: LM5069 overcurrent MOS damage

Part Number: LM5069

Dear Professors:

LM5069 overcurrent MOS damage. would you like to help explaining it?

LM5069 CTIMER pin was not found in test flow into protection mode (8 cycles a interval restart), the use of scenario is 10 Mr Sampling resistance, flow point at about 6 a (SENSE and VIN pin with 51 r resistance).If the sampling resistance is changed to 50mR resistor, the over-current point is around 1A, and the CTIMER protection mode is consistent with the specification (the interval of 8 cycles is restarted).