DRV8353RS-EVM: DRV8353RS-EVM

Hi Siavash,

Thank you for posting your question on the Motor Drivers forum! 

I was able to replicate this issue in lab and figured out a solution. What seems to cause this to happen is due to the current limit being exceeded on the power supply that you are using. In my test I set the VM voltage to 12V and the current limit on the supply to 100mA. When the GUI tried to flash the code onto the F28027 MCU, the increased current consumption at one point during the programming caused the voltage supply to reach the current limit and that resulted in the voltage dipping and causing an under voltage fault for a brief period of time until the current consumption decreased again and the voltage of the voltage supply recovered. The GUI then finished programming the MCU, showing that the device was connected on the lower left corner, but the top left corner showed that it was not connected (which I think is due to the under voltage fault that occurred midway through programming). 

There are a couple ways to fix this issue:

1. Increase the current limit on the supply (I increased the current limit to 125mA at 12V and was able to successfully program and connect to the GUI)

2. Increase the voltage of the supply. When I used 17V or above, the GUI was able to program the MCU without hitting the 100mA current limit of the supply, and I was able to successfully connect to the GUI.

Regards,

Anthony 

Hello Anthony,

Many thanks for your advice. but the problem is still there even with 46V.

Hello Siavash,

What is the current limit set to? Do you see a fault briefly flash during the time when the GUI is flashing the code onto the F28027? Do you see the voltage on the supply briefly during the time when the GUI is flashing the code? When I am looking at your setup, it looks like you are using 2 supplies, one to supply +23V to the positive terminal, and another to supply -23V to the terminal. Instead of using 2 supplies, could you try hooking up the ground of the EVM to the black - terminal on the Master supply, and then hook up the power of the EVM to the red + terminal of the Master supply (just as you have it in the picture)? Then supply 24V and set the current limit to 125mA and see if that works for you. Also check to see if you notice the voltage drop during the flashing of the F28027 and a brief fault as the GUI connects to the hardware and flashes the F28027.

Regards,

Anthony Lodi

Hi Anthony,

I'm helping Siavash in this project and I can confirm that the 2 power supplies are connected in series to get the voltage around 46V. When we try to flash the software there is no dip in the voltage as the current limit is set at around 1.5A

Hello Mohamed,

Do you have any further questions on this thread?

Thanks,

Matt

Hi Matt/Anthony,

Siavash and I got stuck with some other activities at the moment.

Please give us few more days to try again what you mentioned and will come back to you.

Apologies for that

Br,

Mohamed

Hi Mohamed,

No worries, sounds good!

Regards,

Anthony Lodi

Hello Mohamed,

Do you have any further questions?

Thanks,

Matt

Hi Mohamed,

I'll go ahead and close this thread. If you have further questions, please click the "Ask a related question: button at the top right of the window!

Thanks,

Matt