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LM5050-1: On-off control issues

Charlie Xiao
Expert 7525 points
Part Number: LM5050-1

Hi Team,

When there are parasitic diodes, how to solve the problem of the circulation of PS1 and PS2?

Circulation means that the current flows from PS1 to PS2, or from PS2 to PS1. Thanks.

Regards,

Charlie

  • 0
    TI__Guru 57737 points

    Hi Charlie,

    The body diodes of the FETs are missing in this block diagram. You can imagine the body diode anode connected to the FET SOURCE which is connected to the IN pin of LM5050-1 and the cathode of the body diode connected to the FET drain. 

    When LM5050-1 detects reverse current, it turns OFF the Mosfet there by blocking any circulating currents between PS1 to PS2 or from PS2 to PS1. Please be aware that during reverse current flow the body diode of the FET will be reverse biased and will not conduct any current through it. 

  • 0 in reply to Praveen GD
    TI__Expert 7525 points

    Hi Praveen,

    Thanks for your support. How does LM5050-1 detect reverse current? I don't see voltage sampling or current sampling.

    Regards

    Charlie

  • 0 in reply to Charlie Xiao
    TI__Guru 57737 points

    Hi Charlie,

    The LM5050-1 has a comparator integrated and when ever the IN pin voltage falls below OUT pin voltage by VSD(REV) threshold = 28mV, the GATE is pulled low turning OFF the Mosfet.