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LM5060-Q1: Use of LM5060 to drive bi-directional back to back MOSFET switch

Pratik Bhavsar
Prodigy 10 points
Part Number: LM5060-Q1
Other Parts Discussed in Thread: LM5060, TPS4811-Q1

Hi,

I am working on design of MOSFET based bi-directional series switch (back to back MOSFETs). I am planning to use LM5060 to drive back to back MOSFETs. As per my understanding of VDS fault sensing (SENSE>OUT), when current flow from SENSE to OUT pin--->VDS fault condition will satisfy and protection works as intended but when current flow from OUT to SENSE pin (OUT>SENSE) --> VDS will trigger fault condition.

Is LM5060 intended to use for bi-directional series switch where current flow in both direction? i.e. Charging(OUT to IN) and discharging (IN to OUT). If yes, please suggest how to use VDS protection for both direction?

If no, please suggest driver with similar voltage level for bi-directional MOSFETs switch and for more than 100V as well.

Thanks in advance.

Pratik Bhavsar

  • 0
    TI__Guru* 95911 points

    Hi Pratik,

    Welcome to E2E!

    LM5060 cannot provide bi-directional protection. Currently, we don't have a solution.

    Can you please share the end product and use case details.

    We have TPS4811-Q1 driver to support 100V but again it is designed for protection in forward path.

    Best Regards, Rakesh 

  • 0 in reply to Rakesh
    Prodigy 10 points

    Hi Rakesh,

    Thanks for your response. Is LM5060 works for bi-directional switch (provide gate voltage) without VDS protection? I don't want to use VDS protection as providing separate short circuit protection by other circuits which will trigger OVP pin >2V, so VDS protection is not necessary.  

    I have connected back to back n-ch MOASFETs in common source configuration as fig 41 of LM5060 datasheet. Can i connect OUT pin to common source terminal with series resistor which will limit current flowing through OUT pin and keep gate voltage low when voltage provided to VOUT?

    Refer below snap for more info and application:

    Thanks in advance.

    Pratik Bhavsar

  • +1 in reply to Pratik Bhavsar
    TI__Guru* 95911 points

    Hi Pratik,

    Yes, LM5060 works as bi-directional switch and the OUT pin connection should be modified as you shown in the image.

    Best Regards, Rakesh