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TPS53355: Current limit

Part Number: TPS53355

Hi E2E,

Calculate current limit need to refer low-side RDS(ON) value.

The electrical characteristics shows RDS(ON)=2mR. BUT datasheet P.25 shows 10A use 1.7mR; 30A use 1.5mR.

Why had this tolerance?

RDS(ON) of MOS is positive temperature coefficient,  why RDS(ON) will reduce when current  increase?