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Does LM5060 has short circuit protection?

John Chen54
Prodigy 40 points
Other Parts Discussed in Thread: LM5060, LM5069, TPS2490

Hi,

Does anyone know LM5060 has over current protection when Output is shorted to ground?  It is also called short circuit protection when load is shorted.  In order to protect MOSFET, the driver should monitor Vds of MOSFET and Gate, when Vds of MOSFET and Gate are high in the same time, that is the short circuit condition, the driver then turns off MOSFET, that is most of other high side drivers do.    I realized that LM5060 detects Vds of MOSFET, but I am not sure if there is short circuit protection to turn off MOSFET when load (OUTPUT pin) is shorted to ground. 

Thanks!

John  

  • 0
    TI__Genius 12621 points

    Hi John,

    Simply put, the LM5060 does not provide short circuit protection. It also does not have active current limiting or power limiting, so it can only provide very gradual overcurrent protection. Finally, because it senses Vds of the MOSFET (which relies on the FET's Rds-on), the current trip threshold range will vary a lot over temperature, as the Rds-on varies a lot.

     

    Overall the LM5060 is a high power load switch with UV/OV/PG and gradual overcurrent protection.

     

    If you need more robust safety protection, then the LM5069 or the TPS2490/91 would be better suited. However, there may be other devices more applicable depending on your voltage and current requirements.

     

    Each of these devices rely on a small, external sense resistor to determine the current. Because of this, they can offer active current limiting, power limiting, and short circuit protection (they have a fast-shutdown mode and could turn off in well under 10us from a short circuit). The power limiting offers the most protection for the external MOSFETs to keep them operating within their SOA (such as a start-into-short circuit condition, when you have large Vds voltage across MOSFET).

     

    Note: You can visit our website at www.ti.com/hotswap for all our info on these devices. If you choose to design with LM5069/TPS249x or other newer devices, then we offer design calculator tools which greatly help with passive component selection (see Tools & Software tab). We also offer application notes on how to create a robust hot swap design (see Technical Documents tab).

     

    Thanks!

    Alex

  • 0
    Prodigy 40 points
    Thanks Alex,

    Your advise is very help!

    John