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What are the selection criteria for VBUS FET?
If there are guidelines somewhere, please let me know.
- Vgs(Vth)
- Vds
- Id
- Rds(on) : The smaller the better?
If VBUS is fixed at 5V, should Vgs also be 5V?
Thanks,
Tetsuo
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Hi,
FET with Vgs(Vth) in -1V to -2.2V range with Id rating based on your application (5A maximum under USB-PD spec) can be selected for the application.
Since VBUS voltage is fixed at 5V, Vds value greater than 5V with the above Vgs(Vth) and Id parameters can be used.
Regards,
Pranava
Pranava
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Hi Tetsuo-san,
We do not have any specific document for selection criteria for VBUS FET.
You can refer to the datasheet of FET used in our CY4532 EVK https://www.vishay.com/docs/66719/si7997dp.pdf .for the parameters.
You can refer to KBA227425 for more information on VBUS FET usage.
Regards,
Pranava
Pranava
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Pranava-san,
Thank you for your reply.
I have already checked the Vishay FET.
This FET has a very large Vgs(20V) and Vds(30V).
If VBUS is fixed at 5V, I think it is not necessary large Vgs/Vds.
Is it correct?
Thanks,
Tetsuo
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Hi,
FET with Vgs(Vth) in -1V to -2.2V range with Id rating based on your application (5A maximum under USB-PD spec) can be selected for the application.
Since VBUS voltage is fixed at 5V, Vds value greater than 5V with the above Vgs(Vth) and Id parameters can be used.
Regards,
Pranava
Pranava
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Pranava-san
Thank you for your support.
I understood all things.
Thanks,
Tetsuo