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TIDA-01093: Continous Current through Given Mosfets in TIDA-01093 Board

smash Micheal
Intellectual 1000 points
Part Number: TIDA-01093


Hi,

Please share what is the continuous current which is designed to flow across Pack+ & pack- terminals of TIDA-01093 board?

Rohit

  • 0
    TI__Guru* 81035 points

    Hi Rohit,

    I think your colleague asked a similar question last week: https://e2e.ti.com/support/tools/sim-hw-system-design/f/234/p/826761/3058421

    I do know if this board was tested to the maximum current capability of the FETs, but the FET datasheets can be found here: https://www.onsemi.com/products/discretes-drivers/mosfets/fdb2614

    The sense resistor should also be considered. This reference design uses a 1mohm 2W sense resistor. This would limit the current to about 40A.

    The temperature of the board is also important. Consider the Rdson of the FETs and calculate how much power you expect to dissipate for a given current. You should measure your board temperature with a thermal camera at different current loads.

    TI reference designs are intended to provide examples use cases, but you should select your FETs (and number of FETs), sense resistor, and board layout to handle the load requirements for your system.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Intellectual 1000 points

    Hi ,

    Please share how did you concluded 40A figure considering sense resistor ?

    Rohit

  • 0 in reply to smash Micheal
    TI__Guru* 81035 points

    Rohit,

    This is just an estimate to stay under the 2W power rating of this resistor. Power = I^2 * R. My point is that every system has different needs when it comes to current loads and you need to select your FETs and sense resistor appropriately. The datasheet for BQ769x0 has a detailed design procedure (section 11.2.2) to help walk you through these steps. The exact components and layout of the reference design will not work for all applications.

    Matt