UCC5870-Q1: UCC5870 EVM with LAUNCHXL-F28379D

Hello Emmanuel,

What procedure did you follow to configure the gate driver? Could you try reading the status registers over SPI to determine what is preventing the output from switching?

Also, out of curiosity, what are your goals for this board?

Regards,

Daniel 

Hi Daniel, 

I just received the board today. I supplied it with 3.3V and 12V with current limits of 0.2A and 0.5A, respectively. The gate driver was directly configured from  the LAUNCHXL-F28379D. Just as it was described in the User Guide SLUUCE7, it can be programmed directly from the LAUNCH PAD.

My major goal is to use the board as a gate driver with a LAUNCHXL-F28379D for generating the required PWMs for modified converter topologies with 4 to 6 power switches and 3-phase inverter.

Unfortunately, I did not read over the SPI and I have closed for the day.

Thanks

Hello Emmanuel,

From my experience with these drivers most likely the DESAT fault was not disabled, so when you applied PWM without a power fet connected the fault reported and blocked the output.

PLease note this board was designed for software testing, it will be very hard to drive an inverter with it since there are not optimized connections for the gates of the power fets. There are also a lot of fault detection features that are very useful in a real system but may lead to difficulties blue wiring this board into an inverter. It just isn't what this PCB was designed for.

-Daniel

Hello Daniel,

Thanks for your response. DESAT could be a problem. Is there any application note describing the connections of the EPWM pins LAUNCHXL-F28379D to the gate driver channels (I mean the wiring)? 

It will be easier to resolve by just providing PWM signals to the desired channels alone.

Thanks

Hello Emmanuel,

Full gaer board schematics and design files can be downloaded here. https://www.ti.com/lit/zip/sluc703 

Please note that the critical signaly for this issue are most likely the SPI, not the PWM.  Please review the SPI signals and share the configuration that is being sent to the device.

If you don't need all the SPI configurability this gate driver may be better for your application: https://www.ti.com/tool/UCC21750QDWEVM-054 

Regards,

Daniel

Hello Daniel, 

I connected the gate driver via J4 (PEC13DAAN) with SPI and other pins connected for communication with the LAUNCHXL-F28379D. Unfortunately, the GUI could not detect UCC5870 - Q1 EVM.

Emmanuel,

The GUI does not work with the UCC5870-Q1-045 EVM. You will need to write C code for the C2000 on the launchXL to read write SPI. There are examples in the included code.

Alternatively, you can wire in a USB to SPI controller such as https://www.ti.com/tool/USB2ANY and send individual SPI commands.

-Daniel 

Yes, 

I utilized the C code to enable the read/write of the launchXL. The debugging process was successful in code composer. Unfortunately, the GUI could not detect UCC5870-Q1-045 EVM: I can provide you with a screenshot of the CCS window and the hardware setup if you wish

Hi Emmanuel,

Could you clarify what you mean by GUI? I don't know of a GUI for this board, I don't think we released one. All programing is text based.

-Daniel