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TIDA-01469: Issues related TIDA-01469

vishwaranjan pandey
Prodigy 100 points
Part Number: TIDA-01469

Tool/software: WEBENCH® Design Tools

With reference TIDA-01469 we are facing issues, we have Bare PCB and After soldering reverse protection circuit only i.e..C4,C5,C6,C7,C8 and Q1,Q2. Current is Drawing more from board. To overcome this issues what could be done?

  • 0
    TI__Intellectual 1850 points

    Hi Vishwaranjan,

    Have you tested this with a power supply or with battery? With a power supply (ideally no internal resistance) the big capacitance (more than 330uF) will take quite high inrush and the power supply will go to constant current (cc) mode for a small duration of time. With coin cell battery the internal resistance of the battery will limit the current.

    You can consider reducing the capacitance value based on the requirement and the design is explained in TIDA-01469 design document (Section 2.4.2 Power Supply Design).

    Thanks,

    Manu

  • 0 in reply to Manu Balakrishnan
    Prodigy 100 points

    Hi Manu,

    I have tested the Board with coin cell battery.After soldering only reverse protection circuit i.e. C4,C5,C6,C7,C8 and Q1,Q2 ,current is drawing more from the board, then i removed all the capacitor step by step and solder only MOSFET Q1,Q2 in that case also current is drawing more from the board. 

  • 0 in reply to vishwaranjan pandey
    TI__Intellectual 1850 points

    Hi Vishwaranjan,

    This is something not expected. Can you please check as below and let me know the result.

    1. Remove the battery, Q1 and Q2 and then what is the board resistance between battery supply terminals on the board.
    2. Now connect only the battery (current controlled DC power supply) and see the performance
    3. Connect Q1 and Q2 one by one and see the performance.

    During testing with battery – What is the voltage applied to battery? How much is the current drawn Q1 ad Q2 are mounted, is is like a short circuit? What is the part number of Q1 and Q2 used (please verify the mounting of Q1 and Q2 in the board). Can you please share these details?

    Thanks,

    Manu

  • 0 in reply to Manu Balakrishnan
    Prodigy 100 points

    Hi Manu,

    Point wise reply to the Queries are as below:

    1. Removing battery,Q1 and Q2, the board resistance between battery supply terminal is infinity.

    2. Connecting only the battery(current controlled DC power supply) no current is drawing .

    3. After connecting only Q1 and Q2 one by one no current is drawing first time but when connecting battery second time then current is drawing more from board.

    During testing with battery the voltage applied to battery is 3V. current drawing more Q1 and Q2 are mounted.Yes it is like short circuit.The part no of Q1 and Q2 is SI2323DS.

  • 0 in reply to vishwaranjan pandey
    TI__Mastermind 28991 points

    vishwaranjan pandey said:
    3. After connecting only Q1 and Q2 one by one no current is drawing first time but when connecting battery second time then current is drawing more from board.

    Q1 and Q2 serve only for reverse battery protection.  For debug, I would suggest you remove Q1 and Q2 completely and short pins 2 & 3 on each footprint.  Connect the battery and verify current is "normal".  If it is normal, populate C4, C5, C6, C7, and C8 and remeasure current.  If the current is not normal during any step, there is likely a short somewhere on the board.  Since it's a bare PCB it's easy to for solder to create shorts and I would suggest trying a different PCB if one is available.