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TPSM83100: TPSM83100SIUR Output Issue

DATTAGURU HEGDE
Prodigy 20 points
Part Number: TPSM83100
Other Parts Discussed in Thread: TPSM83102

Tool/software:

Hi Team,
Could you please provide some insight into an issue we are experiencing with the TPSM83100SIUR component in our design?
We have adhered to all guidelines specified in your datasheet, including those for component packages, capacitor and resistor values, trace width, and soldering the component.
However, we are not receiving any output power when the board is operational.
Your assistance in identifying the cause of this issue would be greatly appreciated. 
Please Find the Below attachement
Sincerely,
Dattaguru Hegde
  • 0
    TI__Mastermind 18770 points

    Hi Dattaguru,

    It's really strange.

    For the schematic, MLCC caps for Vin and Vout is suggested. No other concerns.

    For the layout, it needs to be optimized, you may refer to the layout example in the datasheet.

    Well, all these factors should not make the device no output. Please have a quick measurement on the Vin and EN (as close as to the chip).

    Regards

    Lei 

  • 0 in reply to Lei Zhong
    Prodigy 20 points

    Hi 

    I would like to request assistance regarding an issue we are experiencing with a circuit.
    We have utilized the exact part number MLCC capacitors for both Vin and Vout as specified in the datasheet.
    While Vin is receiving 5V, we are not observing any output at Vout.
    For your reference, Vin and EN have been placed in close proximity to the chip,
    and I have attached relevant documentation for your review.
    Thank you for your time and consideration.
    Sincerely,
    Dattaguru Hegde

    6683.Layout.zip

  • 0 in reply to DATTAGURU HEGDE
    TI__Mastermind 18770 points

    Hi Dattaguru,

    Please ignore my previous comments about the MLCC caps. I thought only electrolytic caps are used since the symbol in the schematic. So the schematic is OK.

    Have you measured the real Vin and EN voltage on the node that as close as to the chip? And please also double check the feedback resistors R4 and R11.

    And if the module device was mounted manually on board by hand, please check whether the inductor is still well mounted on the module substrate.  

    If the real voltage on the VIN and EN pin are both 5V, the feedback resistors are correct, and the inductor is still well connected, the module device should work normally.

    Regards

    Lei

  • 0 in reply to Lei Zhong
    Prodigy 20 points

    Hi Lei Zhong,

    Have you measured the real Vin and EN voltage on the node that as close as to the chip? And please also double check the feedback resistors R4 and R11.

    Ans: Yes. Voltage on Vin ane EN is 5V. R4 and R11 are 551K and 91K respectively

    And if the module device was mounted manually on board by hand, please check whether the inductor is still well mounted on the module substrate.

    Ans: The inductor [ black plastic package] is well mounted on the module substrate.

    If the real voltage on the VIN and EN pin are both 5V, the feedback resistors are correct, and the inductor is still well connected, the module device should work normally.

    Ans: VIN and EN are 5V

    However, we are not receiving any output power when the board is operational.

  • 0 in reply to DATTAGURU HEGDE
    TI__Mastermind 18770 points

    Hi Dattaguru,

    Could you help a quick check that whether the used chip is TPSM83100, not TPSM83102?

    Regards

    Lei 

  • 0 in reply to DATTAGURU HEGDE
    TI__Mastermind 18770 points

    Hi Dattaguru,

    One more trying, please use another fresh TPSM83100 unit.

    And also double check whether the feedback resistors are correctly mounted.

    Regards

    Lei