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CSD19536KTT: CSD19536KTT Part Usage Quantity Calculation Method

sung jin park
Prodigy 50 points
Part Number: CSD19536KTT

Tool/software:

We are considering using CSD19536KTT FET for 48V BMS.
Charging/discharging specifications are up to 120 A.
In this case, how many FETs should be used in parallel?
May I know an equation for calculating the quantity of FET used?

  • 0
    TI__Mastermind 38130 points

    Hello Sung Jin Park,

    Thanks for your interest in TI FETs. For 120A charge/discharge current, you will need to parallel 4 - 6 FETs for both the charge and discharge devices. You can use the load switch tool at the link below to do your own estimates. The maximum power dissipation capability of the D2PAK package is ~4W on a multilayer PCB with good thermal design. Below is a summary of the calculated power loss in the FETs at 120A and TJ = 125°C.

    Load switch tool: https://www.ti.com/tool/LOAD-SWITCH-FET-LOSS-CALC

    • 4 parallel FETs = 3.92W/FET, 15.68W total for 4 FETs and 31.36W total for 8 FETs (4 x charge & 4 x discharge).
    • 5 parallel FETs = 2.51W/FET, 12.55W total for 5 FETs and 25.1W total for 10 FETs (5 x charge & 5 x discharge).
    • 6 parallel FETs = 1.74W/FET, 10.45W total for 6 FETs and 20.9W total for 12 FETs (6 x charge & 6 x discharge).

    Best Regards,

    John Wallace

    TI FET Applications