TPS563210A: Protecting the input of a TPS563210A from a noisy external system

Gustavo Corona

Part Number: TPS563210A

I'm using a TPS563210DDFR to create a 5V power rail for an embedded system, the schematic is as follows:

The input is 12V, sourced from an external off-the-shelf power brick.

I am using the same 12V to power an external video board, however whenever I attach the video board it takes down the 5V regulator momentarily, and my system reboots. I have no control over the design of that video board, so nothing I can do there. The best I can do is try and protect my system from rebooting when that video board is attached.

Any suggestions?

over 6 years ago

0 Shawn Nie over 6 years ago

TI__Genius 10070 points

There is no issue for the schematic, please check the external off-the-shelf power brick if there load is exceed the max output current.

And could you please share the layout? Let's review it.

Shawn

0 Gustavo Corona over 6 years ago in reply to Shawn Nie

Intellectual 420 points

This is the top side (RED)

And this is the bottom (BLUE):

There is a GND copper pour on both TOP and BOTTOM layer that is not showing in the screenshot above, I turned it off so you could better see the routing.

0 Shawn Nie over 6 years ago in reply to Gustavo Corona

TI__Genius 10070 points

Hi,

The layout is not good, the traces of power stage are too thin, and the trace which is under the IC is easy to be interfered by SW noise.
Please refer the user's guide to design the layout.
www.ti.com/.../slvuay4.pdf

Shawn

Power management

Power management forum

TPS563210A: Protecting the input of a TPS563210A from a noisy external system