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TLV61046A: Loading Capability Improvement during System Startup

awais ehsan
Prodigy 230 points
Part Number: TLV61046A
Other Parts Discussed in Thread: PGA460

Good day, 

I am using tlv61046a to drive/power up PGA460 that is being run in transformer driven bistatic mode at 58 and 200 kHz frequencies. 

With reference to the application note (attached), is it recommended to incorporate solution 2 as mentioned in the app note i.e. using P-FET and zener diode to connect the load (pga460) after Vout is stable? 

In the present case, Vout is set to 8.4V. 

Another way might be to skip the startup solutions mentioned in the app note and configure/access the PGA460 sometime (100 ms) after the tlv61046a is turned on. 

Thanks 

  • 0
    Prodigy 230 points

    Attached is the app note. 

    slvaed6.pdf

  • 0 in reply to awais ehsan
    TI__Mastermind 21565 points

    Hi Awais:

    Thanks for asking. That application note is for improving the loading startup capability.

    As it mentioned, the easiest and most recommend solution is enable the load after startup. As the current limit for TLV61046A is small for protection.

    Please share more details with us, so that we can share some suggestions for you. What's the Vin, and Vout range? What's the load condition, and could it disable during the startup. Does the system need to quick startup? 

    (Besides, I'm out of office these days, the reply may be delay. Thanks for your patience in advance.)

  • 0 in reply to Minqiu Xie
    Prodigy 230 points

    Hi Minqiu, 

    Thanks for your reply. 

    The Vin is 3.65V typical. It is a D cell lithium thionyl chloride primary battery. 

    Vout from tlv61046a is 8.4V. Which is then used to power up PGA460 which has a bistatic transformer driven transducer application. 

    As soon as the PGA460 (load) is powered up, it draws current, not a substantial amount though. I dont have an exact figure right now. 

    So maybe the best way would be to use solution 2 from the app note and adapt it to the +6V condition accordingly. 

    But I will wait for a recommendation. 

    Thanks 

  • 0 in reply to awais ehsan
    TI__Mastermind 21565 points

    Hi Awais:

    Thanks for your kind patience. The solution 2 and 3 all can work. Both solution are verified in our lab. 

    If you don't care about the delay time for startup, I'll recommend the solution 3. It could save the cost of a Zener. But you need to calculate and test the proper parameters of the components.