Thoughts on other FET’s?

Are there any features that you would like to add to the VESC?
lizardmech
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Re: Thoughts on other FET’s?

Postby lizardmech » 07 Dec 2016, 16:18


rew
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Re: Thoughts on other FET’s?

Postby rew » 08 Dec 2016, 09:25


lizardmech
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Re: Thoughts on other FET’s?

Postby lizardmech » 08 Dec 2016, 15:01

They should be better if you mount a heatsink on the top that way they are cooled both sides. It makes them useful in situations like vesc 4x when there isn't mush space underneath for cooling.

slapshot136
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Re: Thoughts on other FET’s?

Postby slapshot136 » 08 Dec 2016, 18:56


rew
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Re: Thoughts on other FET’s?

Postby rew » 09 Dec 2016, 09:18

The last suggestion I saw was "hacked SO8 footprint". My design has a separate powerstage, I have a DPAK-7 (IRFS7530 and friends) power stage and an SO8 footprint powerstage. The SO8 fits all sorts of hacked SO8 footprints.
Once these start selling, I will create a "dual SO8-like" PCB allowing a further reduction of the RDSON....

lizardmech
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Re: Thoughts on other FET’s?

Postby lizardmech » 09 Dec 2016, 15:12


rew
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Re: Thoughts on other FET’s?

Postby rew » 10 Dec 2016, 12:16

You're thinking of another infineon mosfet. I might have made the same mistake a while back.... The IPB010N06N is a DPAK7 just like the IRFS7530, with a plastic case.

slapshot136
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Re: Thoughts on other FET’s?

Postby slapshot136 » 11 Dec 2016, 18:36


rew
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Re: Thoughts on other FET’s?

Postby rew » 12 Dec 2016, 22:35

I have read the optimos fet datasheet a bit more carefully than before. On the one hand, it has a few parameters a bit better than the IRFS7530. However, either they are less exaggerating the ratings than IR, or their mosfet acutally performs less in practice.

the IRFS7530 can handle peaks of 1400A, while the IPB can only handle half that. The silicon limit of the IRFS is similarly twice as high as the IPB. So..... If you want you can try, but for me it's a toss as to which one will turn up to perform better in this application.

The IPB says it is meant for synchronous rectification. IF that means 60Hz operation that might explain low RDSON but overall not quite as good as expected performance.

rutgerv
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Re: Thoughts on other FET’s?

Postby rutgerv » 30 Jan 2017, 12:01

I was just wondering, can the IRFS7530 in the VESC design easily be swapped for a different FET, without requiring changes to hardware or software? I'm planning a fairly low power application (approximately 5 amps peak at 24V) that the IRFS7530s seem overkill for. Bringing down the cost would be an additional benefit, it this would be possible.

Rutger


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