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TPS25940-Q1: Biasing of PGTH, OVP & DEVSLP

Ritik Goyal
Prodigy 20 points
Part Number: TPS25940-Q1

Tool/software:

Hi

I am using TPS25940-Q1 as e-Fuse for short circuit protection. I want to minimize the component counts due to space constraints, so I have connected PGTH, DEVSLP & OVP to GND, and left IMON, FLT, PGOOD floated. Will there be any issue connecting the mentioned pins to GND, as in datasheet nothing is mentioned for PGTH if not used? 

I have attached the snap of circuit for the reference.

Also, I want to cut-off the output completely in case of any circuitry, auto-retry is OK, but it should only cutout the output. Datasheet says it limit the output in case of overcurrent and cutout the output in case of short circuit, but only for few microseconds. But in fig. 10.14 it can be seen that it it completely cutout the output till the current is limited. 

So does it means it will keep the output cut if the I_load is greater than I_fastrip?

Thanks

Ritik

  • 0
    TI__Mastermind 38285 points

    Hi Ritik,

    Ritik Goyal said:
    I am using TPS25940-Q1 as e-Fuse for short circuit protection. I want to minimize the component counts due to space constraints, so I have connected PGTH, DEVSLP & OVP to GND, and left IMON, FLT, PGOOD floated. Will there be any issue connecting the mentioned pins to GND, as in datasheet nothing is mentioned for PGTH if not used? 

    No issue in this.

    Ritik Goyal said:
    Also, I want to cut-off the output completely in case of any circuitry, auto-retry is OK, but it should only cutout the output. Datasheet says it limit the output in case of overcurrent and cutout the output in case of short circuit, but only for few microseconds. But in fig. 10.14 it can be seen that it it completely cutout the output till the current is limited. 

    This device does not perform circuit breaker response as OCP. This device will limit the current and after some time (based on the power dissipation) we can expect thermal shutdown. If you want power cut-off, you may have to go to another device. TPS259474 is one such device.

    Best Regards,
    Arush