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CSD19532KTT: How to use CSD19532KTT to generate high current up to ~100A ?

panhw122
Prodigy 100 points
Part Number: CSD19532KTT

Hello, engineers from TI E2E Community!

I intend to generate a high current pulse for my device. I have researched for many products and I think the N-MOSFET CSD19532KTTis capable to meet my need. The Id of CSD19532KTT can be up to 98A when Tc=100℃ from its datasheet. 

However, I don't know how to use it. My questions are:

1. How to design the circuit? When the current of MOSFET is up to 100A, the same current flows through other resistive loads, then their power is probably much larger than their rated power, resulting destruction of the circuit. So, how to make it?

2. Are there any design guides or examples I can refer to?

Thanks very much for your kind and generous help!

  • 0
    TI__Mastermind 33855 points

    Hello Hongwei Pan,

    Nice to hear from you again. First, please see the following blogs on continuous and pulsed current ratings: 

    Depending on how you want to control the current and the grounding of the load, there are a few different ways to implement the circuit.

    1. High side switch: in this implementation, the drain of the FET is connected to the input voltage and the source is connected to the load. The gate of the FET must be pulled more than 6V > the input voltage to insure the FET is on. The current is not regulated and is only limited by the FET on resistance, parasitic resistance and load resistance.
    2. Low side switch: the source of the FET is grounded and the load is connected between the input voltage and the drain of the FET. Because the source is grounded, the gate can be driven to 6V or higher to turn on the FET. The current is not regulated and is only limited by the FET on resistance, parasitic resistance and load resistance.
    3. Closed loop constant current source: a current sense resistor is used with an op-amp to regulate the current by modulating the gate-source voltage of the FET. Please see the e2e post for more information:

    Please review and let me know if you have additional questions. If you can share your requirements, that may help as well.

  • 0 in reply to John Wallace1
    TI__Mastermind 33855 points

    Hello Hongwei Pan,

    Following up to see if there is additional support needed at this time. If not, I will close this thread out tomorrow.

  • 0 in reply to John Wallace1
    TI__Mastermind 33855 points

    Hi Hongwei,

    Thanks again for your interest in TI FETs. I am going to close this thread out.