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LM5060-Q1: Over Current Threshold

REDDY Y
Intellectual 880 points
Part Number: LM5060-Q1
Other Parts Discussed in Thread: LM5060

In the design calculator tool of LM5060-Q1 there is a huge difference in the Over current threshold values (Min, Typical, Max)

would like to know how to calculate these and apply to end application .. 

screenshot attached FYR.

Required current limit - 90Amps

  • 0
    TI__Guru** 105811 points

    Hi,

    It’s expected due to FET Rds variation with temperature and wide variation of LM5060 internal sensing parameters with the temperature.

    For example,  Minimum Worst-Case Overcurrent Threshold  = (RS*1000)*ISNSMIN-VOFFSETMAX) / [(RDSMAX/1000)*TRDSMAX]

    Uses equation (1) in the datasheet but takes the Rds variation with the temperature  in to account

     Please plug-in the values and check.

    Best Regards, Rakesh