Part Number: DRV8323
We're running a DC motor through DRV8323 by applying a PWM with constant duty cycle with Vdc as 24V.
I applied a constant duty cycle when no motor was connected to it's terminals and suddenly sparks came out and the chip burned. I've attached a photo of the burned chip.
Can you please indicate what could be the reason for the chip's burning.
Thanks for posting on the MD forum!
Could you please share your schematic and layout with us?
Also please share your SPI register settings.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to Adam Sidelsky:
Following is my SPI register values. The rest are set as defaults.
This is the schematic and layout of the board.
In reply to Siddharth Pathania1:
What FET are you using?
The gate current of 260mA/520mA is very high and may be too much for your FETs with no gate resistor unless you have very large QGD on your FETs.
Siddharth is out of town for some time,We work in the same team.
We are using IRFB3407ZPBF .
Regarding the gate resistor, as mentioned in section 8.3.1 of Datasheet ,DRV has internal current control capabilities for the gate of MOSFET
Do we still need resistor on the gate of MOSFET?
Let us know if any other details needs to be provided.
In reply to Pankaj Krishnantrey:
A gate resistor is not needed, but some customers still choose to use it. Your IDRIVE is too high which is causing this issue.
Your FET has a small Qgd of 24nC. An IDRIVE current of 260mA/520mA will attempt to slew the SHx node at 92nS/46nS respectively. This is very quick and will likely cause overshoot/undershoot/oscillation on your gate and switch node.
I would reduce your IDRIVE current to 60mA/120mA and see if the issue persists. This should correspond to a switch node rise/fall time of between 200nS and 400nS.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.