Electronics > Beginners
Question on selecting FETs
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redgear:
I am building a BMS based on one of Ti's reference designs -- TIDA-00792.
I need help choosing the right FETs for the charge and discharge control. I will be using a 7s pack with a nominal voltage of 25.9v and a maximum of 28.7v. My motor draws a max current of 15A and I don't expect the current to go more than 20A even after considering the other electronics.
The above design I linked to uses two CSD19536KTT in parallel for charge and discharge. The FETs are rated at 100v Vds with a continuous drain current of 192A at 100deg.
I think this is a overkill for my system and increases the BOM cost.
Do I really need two FETs in parallel to handle the current and heat?
I am trying to hit a sweet spot between BOM cost and reliability.
Is it ok to look for FETs rated for or above 60v(more than 2x my max) with Id more than 50A(more than 2x my max) ?
I have shortlisted a few FETs, want to know which one to pick and how many(in parallel). I am open to suggestion outside this list too.
Vishay Siliconix SQR70090ELR_GE3 - 100v 50A
Vishay Siliconix SQD50034EL_GE3 - 60v 68A
Vishay Siliconix SQM60030E_GE3 - 80v 120A
Vishay Siliconix SQR97N06-6m3L - 60v 56A
Thanks
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