TPSM831D31EVM: Gerber files

Noah Hicks

Prodigy 120 points

Part Number: TPSM831D31EVM
Other Parts Discussed in Thread: TPSM831D31,

Tool/software:

Can I have access to the layout for this part? Trying to debug channel A voltage not working properly.

1 month ago

0 Troy Johnson 1 month ago

TI__Expert 4325 points

Hi,

I will check if we are able to provide the layout files for this part.

Can you provide specifics on the behavior you are seeing so we can help debug?

Regards,

Troy

0 Noah Hicks 1 month ago in reply to Troy Johnson

TI__Prodigy 120 points

Hey Troy,

The problem I'm having is that the voltage output is 4x what it's set to in the register. If I set Vout to be 0.25V, it will instead be 1V.

0 Troy Johnson 1 month ago in reply to Noah Hicks

TI__Expert 4325 points

Hi Noah,

Please share your configuration file (.xml), exported from the device via TI's Fusion Digital Power Designer GUI.

Regards,

Troy

0 Noah Hicks 1 month ago in reply to Troy Johnson

TI__Prodigy 120 points

Hi Troy,

Here's the XML file. I think I exported it correctly but may not have, let me know if this is what you need.

With these settings, I'm seeing 4.11V at the output.

Thanks,

NoahTPS831D31EVM Config.xml

0 Troy Johnson 1 month ago in reply to Noah Hicks

TI__Expert 4325 points

Hi Noah,

Thanks for providing XML file. I was able to import it to device on my board and run both rails, but did not see the incorrect voltage output. With rails set to 0.5V, I can measure 0.5V on output.

Could you check what voltage is reported in Fusion GUI Monitor Tab while rail is regulating? Is it the set voltage, or the same as you measure at output?

Regards,

Troy

0 Noah Hicks 30 days ago in reply to Troy Johnson

TI__Prodigy 120 points

Yes, the Fusion GUI Monitor Tab says that the voltage rail is at 0.5V, but the (confirmed working) multimeter I'm using still says 2V when connecting to test points VOUTA and GNDA. Fusion GUI also lists a 0.8A output with no load connected.

0 Troy Johnson 29 days ago in reply to Noah Hicks

TI__Expert 4325 points

Hi Noah,

Thanks for checking. Seems that the configuration is okay, but that there is a voltage drop between output and the controller voltage sense.

I will look into what cause of this drop may be, and get back to you by Friday 8/22.

Regards,

Troy

0 Troy Johnson 24 days ago in reply to Troy Johnson

TI__Expert 4325 points

Hi Noah,

I have found the internal schematics for controller and power stages on TPSM831D31, but have not been able to identify anything that could cause this voltage drop within the module itself.

This is being tested on the TPSM831D31EVM, correct?

I will check EVM schematic and continue to look for what could cause this behavior. I will update you by end of the week (8/29) at the latest.

Regards,

Troy

0 Noah Hicks 24 days ago in reply to Troy Johnson

TI__Prodigy 120 points

Hi Troy,

Thanks for the update. You're correct, this is on the TPSM831D31EVM. I appreciate you looking into this!

0 Troy Johnson 20 days ago in reply to Noah Hicks

TI__Expert 4325 points

Hi Noah,

You are measuring at the VOUTA and GNDA test points correct? Based on EVM schematic there are 10 ohm resistors between these two points and the controller voltage sense.

The 10 ohm resistors would not normally cause significant voltage drop, but could if they became damaged somehow.

Can you check value of resistors R11 and R12, on bottom of the EVM, with a DMM? You can also try measuring VOUT on either side of the resistors to verify if a drop is taking place.

Regards,

Troy

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TPSM831D31EVM: Gerber files