DRV8350H circuit design failure. what am i doing wrong?

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Jesse22

Joined Jun 16, 2021
1
Hello, I've been working on this brushless motor controller for a long time now. This is version 2 as I began using a different mosfet driver DRV8350H. After soldering with a heat gun twice with two different DRV's, both don't seem respond at all despite double checking and making sure every connection was correct. I cannot tell what I'm missing here. maybe someone here might have an idea on what I might have done wrong with either my design or layout. I really just copied what the datasheet recommended. I'm truly out of options. maybe also someone might have a recommendation of an easier mosfet driver to deal with, let me know aswell. thank you!
 

eetech00

Joined Jun 8, 2013
2,645
Hello, I've been working on this brushless motor controller for a long time now. This is version 2 as I began using a different mosfet driver DRV8350H. After soldering with a heat gun twice with two different DRV's, both don't seem respond at all despite double checking and making sure every connection was correct. I cannot tell what I'm missing here. maybe someone here might have an idea on what I might have done wrong with either my design or layout. I really just copied what the datasheet recommended. I'm truly out of options. maybe also someone might have a recommendation of an easier mosfet driver to deal with, let me know aswell. thank you!
We need a schematic of your design.
 

LowQCab

Joined Nov 6, 2012
1,321
Do you just want to see if you can do it ???
If so that's cool,
but I would recommend just buying one.
There are many important nuances to controlling a BLDC Motor,
and getting them right can be extremely tricky.

There's a ton of them to choose from, at very reasonable prices.
.
.
.
 

jeffl_2

Joined Sep 17, 2013
56
You haven't really provided us with enough information. Both the DRV10970 and DRV10975 are available in packages that are a little easier to solder, but (for example) they only get you up to an 18 volt supply, whereas I think the 8350 is OK to 95 volts, and it's not as if they were "interchangeable" in other respects. Also since it is a motor driver you have a thermal dissipation issue that may require soldering a separate area onto the PCB for heat dissipation. On a related issue I recently found a "motherboard repair" shop in my area that for a fee will solder "difficult" packages like fine pitch (20 and 25 mil centers) and QFN and QFP (requiring reflow capability) onto a board for you for your prototype needs, and the quality of their work was excellent, you might try that approach.
 
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