• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 288 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TPS40425: TPS40425 dual output schematic check: 12v to 3.3v/25A -1.8v/6A ; 1.125V/25A-0.8V/25A

TPS40425: May tps40425 can support Vout ramp time?

Chen Bogey8
Mastermind 9990 points
Part Number: TPS40425

Hi Sir 

My customer device request ramp time as below. May TPS40425 can support?  

Condition TPS40425 Vin is 12V vout is 3.3V @0.66ms~10ms and 0.8V@ 0.05ms ~10ms.

If yes, how to set up in circuit? or here have other suggestion solution?

PS: Vout load are 0.8V/18.85A and 3.3V/49.9A

                                        Bogey

  • 0
    TI__Mastermind 24075 points

    Hi Bogey,

    The PMBus register TON_RISE (61h) can be used to set soft-start time.

    The soft-start time can be programmed from 0.6ms to 9ms.

    You also can use TI Fusion to set soft-start time easily.

    Thanks

    Qian

  • 0 in reply to Qian Chen
    Mastermind 9990 points

    Hi Qian

    More few questions,

    1. Can you told me the default soft-star timing ?

    2. How to use TI Fusion to set the soft-star timing?

    3. If the timing can’t meet the requirement, we should be follow the below flow. Right?

     

    Power up 12V feed to VDD of TPS40425à Program register TON_RISE(61h) to the soft star is around 2msàenable TPS40425

     

    1. We only connect the CNTL1 for enable function, right?

  • 0 in reply to Chen Bogey8
    TI__Mastermind 24075 points
    Hi Bogey,



    1.Can you told me the default soft-star timing ?
    The defualt setting is 2.7ms.

    2.How to use TI Fusion to set the soft-star timing?
    It is in Fusion->Configure.
    If you installed Fusion, you will find it.

    3.If the timing can’t meet the requirement, we should be follow the below flow. Right?
    The time information on your pictur is not clear. Is there a delay time between two rails?

    Thanks
    Qian