Hello, I’m looking to drive two relatively high power and high speed (20k rpm, 120 watt) BLDC motors with hall sensors from an ESP32 at 48 volts. I designed a board around the DRV8316 chip and then realized that it only supports up to 40 volts :man_facepalming:. There are a fairly overwhelming nu…

It seems like the L2635 is still actually a pretty decent choice even though it is quite old. Is that crazy? Is there something more recent which is better? EDIT: Ah it’s discontinued so yes it is crazy :cry: Second Edit: It looks like the PD package is still in production, but I’d still love to f…

The MP6540H looks like it might be a good option although I can’t find much record of folks using it with a quick search of the forums

[image] BarbourSmith: board around the DRV8316 chip Welcome! For 48 volts you need something around 70 TO 80V to handle the spikes. I’m not aware of any fully integrated driver going that high. DRV832x (DRV8323) go as high as 65, try that one? You’ll need a lot of protection to avoid spikes…

[image] BarbourSmith: something a little more modern IGBT smart modules [image] [image] [image] [image] There are a lot more of those. [image] [image] IGBT Driver NFAM5065L4BT SimpleFOC board hardware support Yeah, the shunt resistor is impor…

[image] Valentine: For 48 volts you need something around 70 TO 80V to handle the spikes. That’s great advice! Thank you, I didn’t realize I needed that much overhead. [image] Valentine: Or, you can do IGBT integrated, those beasts go up to 1200 volts. That is also a great tip. I didn…

Actually I take that back, some of those that you found look very reasonable. Are you seeing them in stock at LCSC though? That screenshot seems to say yes, but when I’m searching they are coming up as not available

This is incredibly helpful, thank you!

Is this a terrible Mosfet selection choice? My hunch is yes, because motor driving isn’t listed in the applications section of the data sheet. [image] SI9945BDY-T1-HXY HXY MOSFET | Transistors/Thyristors - LCSC Electronics SI9945BDY-T1-HXY HXY MOSFET $0.2142 - 60V 6.5A 36mΩ@10V 2 N-Chan…

It is pretty high, but I don’t know if there are any better with high voltage in a small package. Single channel 5x6mm have much better specs, but of course take up twice as much space. This is the best high voltage one I found when I searched around a while back. 80V, 3.9mOhm. About a dollar each, …

[image] BarbourSmith: seeing them in stock at LCSC though Yes, they are. Also, the igbt intelligent modules are all through holes, you can order the PCB and solder yourself if you order the module separately. JLC has currently 21 different modules in stock. Search in the [image] JL…

Driver chip selection advice

Valentine August 21, 2024, 8:11pm 5

IGBT smart modules

There are a lot more of those.

Cheers,
Valentine