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TPS63000

henk visser
Prodigy 20 points
Other Parts Discussed in Thread: TPS63000, TPS63010

I'm debugging one of my last boards and I wanted to double check with you guys that what I have is correct.  I am using the TPS63000 and I want to change the output voltage from 3.0V down to 1.8V by using a FET to bring in a 374k resistor in parallel.   

There is a divider on the feedback pin (FB) and I am using a 887k and a 340k divider.  Then once the FET is turned on I will have 374k that is connected to the midpoint of the divider.

Is this easy to simulate with Switcher Pro?


Thanks for the assistance.

-Henk

 

 

  • 0
    TI__Intellectual 2310 points

    Henk

    I ran the simulation in Switcher Pro. to get 1.8Volts you need 887k on the top and 332k on the bottom total. Is that what you have?

    I am not sure why I cannot send you the file.

     

    Timothy

  • 0 in reply to TimothyDarling
    TI__Intellectual 2710 points

    Hello Timothy,

    Currently, 'Send Design' functionality is available only to web users.

    To send a design to another SwitcherPro online user, you can use the 'Notes' tab and enter the other user's email address (which is used to login to SwitcherPro). When you click on 'Send Design', the other user will find the design in his 'MyInbox' folder in SwitcherPro.  

    Thanks,

    Hetal Joshi

    Senior Developer and Project Manager

    Analog eLab Design Center

    HPA Design Tools

    Texas Instruments, Inc.

     

    TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs.

  • 0 in reply to TimothyDarling
    Prodigy 20 points

    Thanks for the response Timothy.

    I am trying to verify the values for 3 resistors for both the 3.0V and 1.8V cases.

    Right now I have 887k for the top and 340k for the bottom.  The third resistor that I am switching in with a FET  is 374k. ( This will be in parallel with the 340k)

    From what I can tell when the FET is on the the output should be 3.0V.  When the FET is off then the output is going to be 1.8V.

    Do you mind simulating what is above including a n-channel fet?

    Thanks.

    -Henk

     

     

  • 0 in reply to henk visser
    TI__Guru* 75856 points

    You may want to use PSpice or Tina to simulate this circuit using the TPS63010 model.  The MOSFET could be easily added to evaluate the switching from 3.0V to 1.8V.  The models are availed for down load in the product folder.  TPS63010 and TPS63000 are very similar parts and the simulation results will be comparable.

     

    Equation 1 from the TPS63000 data sheet can also be used to evaluate resistor values.