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TPS2492: improved TPS2492

frederic charlier
Intellectual 260 points
Part Number: TPS2492
Other Parts Discussed in Thread: TPS2663, TPS1663, TPS1685, LM5066I

Tool/software:

Hello,

I have been using TPS2492 for many years in 12 and 48V applications.

Do you have anything better now?

I am mostly looking for:

- smaller package

- smaller "Current limit threshold V(VCC-SENSE) without power limiting trip"   (TPS2492 = 50mV typ.)

- more accurate safety timer

- more accurate current limitation

The other features of TPS2492 I need:

>48V VIN

- current monitor output

- latch off mode

- high temperature / +125degC operation

Thanks.

  • 0
    TI__Mastermind 32781 points

    Hello Frederic,

    Thanks for reaching to E2E.

    what's the operating current you are looking for your application?

    You can check TPS1663,TPS2663,TPS1685 (Integrated FET)

    LM5066i.LM5059 (External FET).

    Thanks 

    Amrit 

  • 0 in reply to Amrit Jit
    Intellectual 260 points

    Hello Amrit ,

     

    We typical have high side switches of 5, 10 and 20A current rating.

    TPS1685 with “3.6mOhm” RDSon seems interesting.

     

    Concern/Question 1 = TPS1685 “overcurrent response” is “circuit breaker”

    I have always preferred “(fast) (active) current limiting” switches.

    For me, this is safer to prevent/limit the drop of the input voltage when there is an overcurrent/short on the output.

    Do you know why someone would prefer a “circuit breaker” ?

     

    Concern/Question 2 = power up with large capacitive loads

    How do you determine the maximum capacitor that can de charged by TPS1685 ?

    In particular, I haven’t seen any transient thermal impedance in the datasheet.

     

    Thanks,

    Frederic

  • 0 in reply to frederic charlier
    TI__Mastermind 32781 points

    Hello Frederic,

    I will assign the thread to my team-mate who supports TPS1685.

    Thanks 

    Amrit

  • 0 in reply to Amrit Jit
    TI__Guru* 79181 points

    Hi Frederic

    1.Concern/Question 1 = TPS1685 “overcurrent response” is “circuit breaker”

    I have always preferred “(fast) (active) current limiting” switches.

    For me, this is safer to prevent/limit the drop of the input voltage when there is an overcurrent/short on the output.

    Do you know why someone would prefer a “circuit breaker” ?

    Generally we have seen requirement of circuit breaker in high current and high voltage space. We have retry variant also so if device got shut off due to transient load it can try to recover back.

    Concern/Question 2 = power up with large capacitive loads

    How do you determine the maximum capacitor that can de charged by TPS1685 ?

    It will be confirmed during final release. You can order evm and try evaluating. Using dvdt pin we can reduce current to charge large caps without heating device beyond thermal protection. It can definitely support 3-5mF at 54V.

  • 0 in reply to Kunal Goel
    Intellectual 260 points

    Hello Kunal,



    #1: Could you elaborate a little more on this:

    "

    Generally we have seen requirement of circuit breaker in high current and high voltage space.

    "

    Do you know why someone would prefer a “circuit breaker” in " in high current and high voltage space"?

    Or is this a limitation of the technology (easier to do a circuit breaker in " in high current and high voltage space")?



    #2: Does TPS1685 support/survive any kind of short circuit (even very low induction short - with high di/dt) ?



    Thanks,

    Frederic

  • +1 in reply to frederic charlier
    TI__Guru* 79181 points

    Ho Frederic,

    1: Could you elaborate a little more on this:

    "

    Generally we have seen requirement of circuit breaker in high current and high voltage space.

    "

    Do you know why someone would prefer a “circuit breaker” in " in high current and high voltage space"?

    At high current keeping FET in current limit can stress FET more and not good for longer lifetime of FET. 

    Or is this a limitation of the technology (easier to do a circuit breaker in " in high current and high voltage space")?



    #2: Does TPS1685 support/survive any kind of short circuit (even very low induction short - with high di/dt) ? It supports VOUT to GND short. 

    Regards

    Kunal Goel