AUDIO-AM275-EVM: CS3571400: AUDIO-AM275-EVM got broken

Let me to reassign to someone that is more expert with EVM

Hi James,

so, how to move on? We need a working board to develop on.

BR

Matthias

Yes I've discussed and they are to be replying back today 

Hi Mattias, 

Unfortunately, this board is not eligible for replacement since it was functional when originally received. 

The U73 device is a power switch used to toggle between the two USB-C power ports. In the case of U73 experiencing an overcurrent event, (maybe due to a short downstream in another part of the EVM) it could have become damaged. The large inductor to the left of U73 in your photos is the VCC_5V0 rail inductor. This inductor is an 11A DC rated component, but appears damaged in your photos. This also indicates an overcurrent event was seen. 

Can I ask how exactly you were powering this board? What supply was attached to the USB-C power input? A standard USB-C PD supply should have disconnected in the case of an overcurrent event. 

Thank you,

-Randy

Hi Randy,

The board was powered using momax UA10 adapter using PD USB-C output C2 capable of delivering up to 35W. Adapter has been used with various devices across many years without issues or damage to any other device.

Can you confirm that the power-delivery negotiation is properly implemented on the TI-PD controller?

The large inductor L24 is not damaged as it looks exactly like inductor on the other board which is running fine. Both "out-of-the-box" have some manufacturing residue glue/paste-like piece that can be simply removed.

The AM275x was the only device connected. It seems as if it failed PD negotiation with the adapter. Indeed PD should have negotiated a safe 5V baseline before allocating power. The user guide states the board requires a source capable of more than 15W, with no warning that a higher-wattage USB-PD supply is incompatible or dangerous.

BR

Matthias

Hi Matthias, 

Can you please share the serial number of the AUDIO-AM275-EVM board you saw this issue on? I'd like to try and verify what USB-C auto-negotiation profile was programmed on it. 

Higher wattage USB-C PD source should be compatible with the TPS65988 USB-C PD controller onboard. I don't see an issue with that at all. Did you happen to see what voltage the UA10 was negotiating on the good board?

I would have hoped over-current detection on this UA10 adapter should have protected the downstream board, but not sure how fast this circuit reacts. Did the fuse on the UA10 blow when this event occurred? 

Thank you,

-Randy

Hi Randy,

Randy Rosales said:

Can you please share the serial number of the AUDIO-AM275-EVM board you saw this issue on?

you can find the SN in my initial post.

Randy Rosales said:

Did you happen to see what voltage the UA10 was negotiating on the good board?

No, there was no monitoring installed from my side.

Randy Rosales said:

Did the fuse on the UA10 blow when this event occurred?

No, it is still doing fine.

BR

Matthias

Hi Randy,

Any update?

BR

Matthias