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TPS60500_ Enable# Pin Permanently connected to ground.

Balasubramanian Periasamy
Prodigy 60 points
Other Parts Discussed in Thread: TPS60500

Hi,

What would be the transient response of output (Vout), if Enable# (active low) pin is directly connected to ground.??

 The TPS60500 is used to regulate voltage from 3.3V to 1.2V.

If the enable pin is directly coneected to GND, is there any possibility that VOUT shall ramp up beyond 1.2V during power up state (ie while 3.3 is rising) ???

Please clarify.

Thank You

 

  • 0
    TI__Mastermind 29630 points

    Hi,

     

    Here is some transient responses attached and see fig 20 on the data sheet as well. We are ordering the EVM, and we will do some lab testing for your specs. We will update you as soon as possible.  

     

     

    Thanks!

    Tahar

    Load Transients.zip
  • 0 in reply to Tahar Allag
    TI__Intellectual 1595 points

    Hi,

    Attached are the startup and the load transient plots. During start up the Vout maximum is about 1.219V. Also I performed the Load transient on our EVM by adding an additional 22uF cap.

    Thanks

    Spandana

    TPS60500.zip
  • 0 in reply to Spandana Kocherlakota
    Prodigy 60 points

    Dear Spandana,

    Thank you very much for earlier response on transient response. I appreciate your effort on this. Further to this i have 2 queries to be clarified.

    1. whether did you permanently connected the enable (EN#) pin to ground (before giving Vin) during this transient response analysis ?

    2. can you please share with me the test set up (or) circuit diagram you used to make this measurements.

    Kindly provide the details. Awaiting for your response as early as possible.

    Thanks & Regards,

    Bala.

  • 0 in reply to Balasubramanian Periasamy
    TI__Mastermind 29630 points

    Hi,

     

    • Yes, the EN pin is permanently connected to GND before applying VIN.
    • For the set up, we used the EVM and we added an additional 22uF at the output for better output ripple.
      1. For the start up test, we plugged in the EVM to a power supply and we turned on the power supply (Not hot plug) and then we captured the VIN and Vout.
      2. For the load transient, we changed the load as shown in the attached figure in the previous post by using load transient board. Load transient board is just a MOSFET turning it ON and OFF by controlling its gate.   

     Please let me know if you have further questions.

    Thanks

    Tahar