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Unread 21-06-2016, 21:46
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Re: SD540 Motor Controller

Quote:
Originally Posted by Michael Hill View Post
I agree it's too high. Looking at the pictures more closely, it looks like this is the MOSFET: http://www.nxp.com/documents/data_sh...N1R0-30YLD.pdf All looks fine to me (in fact, I think it's the same as, or at least related to, the one used in the Talon SRX as shown in this teardown: http://imgur.com/gallery/2xqoU). The current sense resister seems odd to me. I'm trying to make sense of the marking. The SRX uses a 0.5mOhm sense resistor (M50), but the SD540 has a marking of "50m", which doesn't make any sense to me since the math wouldn't add up (50mOhm). Is there an alternate interpretation of that marking?

Large picture of the SD540 here: https://images-na.ssl-images-amazon....1X6vyE3RyL.jpg
I think R50M is 0.5mOhm. It's kind of a weird label, but it's the only thing that makes sense. http://www.tai.com.tw/index.php/en/p...istors/111-rlf

What's a current sense resistor doing here though? I didn't know it needed to measure current.

Also - I just noticed it has 8 FETs (two in parallel everywhere), compared to the Talon's 4. Kind of odd.
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