Few notes: B500 is probably a self resetting fuse on the 12V line I think this is 4 layer, otherwise where are all the vias on the bottom that have no plane atttachment or traces going? Copper is 0.5mohm/square for 1oz... likely the IMS is a 2oz board, so the scale of the PCB resistances are in the 0.25 mohm region due to the areas between shunts and the busbars/phases. This is quite a small loss. The diode on the MOS gates is either a zener clamp on the gate, or could be being used to do faster turn off than on... hard to tell. The tiny 0402 thing on the gates is either a capacitor (for damping/decoupling gate ringing) or it could be a pull down to keep the MOS off when the gate drivers are in UVLO. Some gate drivers go high impedance output when UVLO and then the MOS gates float up until... pop. Conceptually, it is a really solid design; I made some very similar boards this way and posted them on ES (back before anyone was doing IMS VESC based boards). They perform really well, but there are subtleties with the gate drive and current sense circuits when using 2 board designs that it is not clear have been addressed here. Proof in the pudding though, if it pushes power and stays alive then all good.
You are probably right about it being at least 3 if not 4 layers. I didn't think about the vias in the top most layer not coming through to the underside. Thank you for the correction.
question Is sabvoton controller so sorry you don't even talk about them besides you mentioning them in little bit in different segments I see that you have tore down most popular ones I've been hearing about and I was on the fence on getting far driver but now I think you have convinced me to get one 😂
Sabvoton controller failure rates are quite high since the company closed up shop in late 2014. Everything since then has been clones and most of those are quite poor. No new development in any way has been done to anything Sabvoton related since 2014! It's pretty damned dated and only good Sabvoton products are all from before they closed up shop about 10 years ago! FD is at least current development and for China controllers...better than most others. Honestly though, this spintend is still better than a Far Driver assuming your power requirements match up. VESC is always best and that's unlikely to change!
@@de-bodgery thank you very much for the info did not know sabvoton went out of business since 2014 and everything else has been cloned so that means my controller is not really a sabvoton controller good information to know 🤔 so needless to say I'll be switching to a far driver controller as soon as possible thanks again You may want to do a segment on that so that people will know Amazon is selling not regulated stuff at a very high price way more than far driver I'm thinking and NBpower is behind it. Using the name to make money off of us non money having people lol thanks again keep up the good work really enjoy your video so far been very informative...
@@lowdownbrown2002 I've run across 4 or 5 variants/clones of the old Sabvoton controllers. Some are better than others, but none have seen any new development since 2014.
The Shunts are the hottest part of the board. Take a thermal camera to it. Wires are a great heat sink compared to just a PCB. I get you are putting yourself out there with these videos but by making definitive statements about stuff you don't actually know makes you look bad to those who actually do this kind of thing. From the perspective of a semi-ignorant audience member definitive states make you seem like an expert. You need to allow form more nuance and make concession when you don't really know things. Also those are nickel plate copper bus bars and very easily sourced.
Thanks for the feedback. So you know for fact that the buss bars are nickel plated copper or you are assuming they are? Do you have proof of this? I wasn't emphatic what they were as I don't know.
