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TPS63002: R100 resistor?

Jure Korber
Prodigy 30 points
Part Number: TPS63002

Hello!

I'm designing a circuit using TPS63002. In recommended part list and application there is R100 resistor. I wonder if I can use R150 instead of R100 because I'd like to reduce BOM (I already have some R150 resistors in BOM). 

Would changing R100 to R150 have some consequences? What is the job of this resistor? 

Thank you!
Best regards, 

Jure Korber 

  • 0
    TI__Expert 8420 points
    The 100 ohm resistor, if we are talking about the same one, is part of the RC filter connected to VINA, in order to provide a filtered supply to the internal circuitry.
    In my opinion it should be fine to use 150ohm, but you need to test it.
  • 0 in reply to Sabrina
    Prodigy 30 points

    Hello!

    Do you recommend any testing method? Just to check output voltage and that's it, or it there any testing protocol that I could follow? I'm also asking about EMI emissions. The device is designed by your reference scheme / recommanded layout, but still I want to know if there is anything I could measure with normal equipment (like scope, multimeter) that could indicate how well is the device working? 

    Thank you very much!

    PS: I'm using TPS63002 in numerous projects and never had an issue before, very good thing. 

    Best regards, 
    Jure 

  • 0 in reply to Jure Korber
    TI__Expert 8420 points
    HI Jure,

    There is no particular protocol it depends on your design specifications. Usually checking the current consumption of the device also help to cross check the device is operating properly.
  • 0 in reply to Sabrina
    Prodigy 30 points

    Hello!

    Thank you! So if I understand correctly, I should measure input voltage and input current and calculate input wattage and than measure output current, voltage and calculate output wattage. Input wattage = output wattage + losses. Losses can be looked up in IC datasheet in graphs. If those are somewhat similar, I can expect that device is working properly and there is no problems regarding EMI etc. 

    Best regards, 

    Jure 

  • 0 in reply to Jure Korber
    TI__Expert 8420 points
    HI Jure,

    "Problems regarding EMI" is related to the way the PCB is designed, the device "working properly" and " no problem regarding EMI" can not be linked that directly.

    Here is an app note giving Layout tips for EMI reduction: www.ti.com/.../snva638a.pdf