LTC4364: MOSFETs Rds(on) instead of Rsense

Hello,

I'm building high current power source and plan to use LTC4364 as a ID controller and current limiter in case of short circuits events at output.

To be effective I've thought of using FETs Rds(ON) as a Rsense for current limiting feature. Can you advise if this method possible in this controller and application?

Thanks 

Sergey

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    •  Analog Employees 
    on Nov 17, 2020 8:22 PM

    Using FET Rds(on) for current sensing yields a much larger tolerance on current limiting when compared to a sense resistor (e.g., see LTC4213). The FET configuration here is unclear but I don't think it works out since SENSE-OUT absolute maximum rating is +/- 30V max and the SENSE pin is used not just for current limiting but also for ideal diode control.

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  • 0
    •  Analog Employees 
    on Nov 17, 2020 8:22 PM

    Using FET Rds(on) for current sensing yields a much larger tolerance on current limiting when compared to a sense resistor (e.g., see LTC4213). The FET configuration here is unclear but I don't think it works out since SENSE-OUT absolute maximum rating is +/- 30V max and the SENSE pin is used not just for current limiting but also for ideal diode control.

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