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TPS60501: Design Help!

Sherman Wilder
Prodigy 220 points
Part Number: TPS60501

Hi. I am a student designing a PCB Board for my research and needed help determining the resistor values for a 2V - 3.3 V max output. My input is coming from a boost converter that supplies an Vout of 5V. 

I looked through the documentation multiple times, but could not find an answer for a 3.3V max output application/circuit. 

If someone could help me determine my resistor values or tell me where I can find them, I would be grateful. 

  • 0
    TI__Mastermind 26776 points

    Hi Sherman,

    If you are using TPS60501, you just need to connect the FB pin directly to Vout without any need of a resistor divider. See figure below for reference.

    Best regards,

    Excel

  • 0 in reply to Excel Regidor
    Prodigy 220 points

    Thank you Excel!

    I seen those two figures, but wanted to make sure I was looking at them correctly.

    3 questions:

    1. What is the R value that is connected to Vout?

    2. What if my Vin drops below 4.3 V? What Vout would I be looking at? Is there a Vin vs Vout graph or table?

    3. What am I using for the Enabler? Is it a switch? Or do I just need to pull it high all the time if I want it to be always on?

    Like I said, I'm a student, so sorry for the crazy questions...

  • 0 in reply to Sherman Wilder
    TI__Mastermind 26776 points

    Hi Sherman,

    Please see response below as highlighted.

    1. What is the R value that is connected to Vout? --> 1M resistor should be fine.

    2. What if my Vin drops below 4.3 V? What Vout would I be looking at? Is there a Vin vs Vout graph or table? --> The Vout will drop proportionally with Vin @ Vin < 4.3V.

    3. What am I using for the Enabler? Is it a switch? Or do I just need to pull it high all the time if I want it to be always on? --> The EN pin should be always pulled High for the device to have an output voltage (Vin = 1.8V to 6.5V).

     

     

    Best regards,

    Excel

  • 0 in reply to Excel Regidor
    TI__Mastermind 26776 points

    Hi Sherman,

    I will close this thread. In case you have further questions, just post it here.

    Best regards,

    Excel