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Need part suggestion

Ayush Awasthi
Prodigy 90 points
Other Parts Discussed in Thread: CSD18541F5, CSD18543Q3A, CSD19538Q3A, CSD88539ND, CSD19538Q2

Hi,

I have a query regarding selection for PMOS, NMOS, or complementary mosfet. 

Requirement is to find mosfets for the switching of 500KHz frequency, so what will be the calculations for selecting the mosfet, moreover i want to know how to calculate for the switching time for the mosfet.

for reference i am adding the part CSD18541F5.

I am adding this circuit for reference

  • 0
    TI__Mastermind 32965 points

    Hello Ayush,

    Thanks for your interest in TI FETs. Our PFET devices are are rated to -20V max and we have no recommendation for the P-channel FET. For the NFET, the CSD18541F5 is optimized for load switch or low frequency switching and has not be tested at 500kHz. The internal gate resistance is 1.2kΩ typical and the device will not perform well at this high of a switching frequency. We may have some alternatives depending on your requirements. The CSD18543Q3A is optimized for higher frequency switching applications and is in a 3.3x3.3mm SON package. Can you use all NFET devices in your application? If so, the CSD88539ND dual, 60V N-channel FET in SO8 may be an alternative. This device requires VGS = 6V minimum gate drive. The CSD19538Q2 is a 100V N-channel om 2x2mm SON package. This also requires a minimum VGS = 6V gate drive and is available in 3.3x3.3mm SON as the CSD19538Q3A.

    Best Regards,

    John Wallace

    TI FET Applications

  • 0 in reply to John Wallace1
    Prodigy 90 points

    Hi John, Thanks for you reply and suggestion.

    But i also need to know the deciding factors for calculating switching frequency.

  • 0 in reply to Ayush Awasthi
    TI__Mastermind 32965 points

    Hi Ayush,

    I'm not sure what you're asking with regards to switching frequency. Many of TI's FETs are optimized for switch mode power applications switching up to 1MHz. However, some devices are optimized for static switching applications such as load switch, hot swap and OR'ing where the FET is turned on and left on. Lastly, we have some FETs that are targeted to motor drive applications where the switching frequency is <50kHz. Please let me know what else I can do to help you best.

    Thanks,

    John