Questions on LM5122QMHX/NOPB: Layout and Design Best Practices

[sdiwen]

Hello everyone,

I’m currently working on a power electronics project that incorporates the LM5122QMHX/NOPB. I'm encountering some challenges regarding its PCB layout and overall circuit integration.

Could anyone share their experiences or recommended practices for optimizing the design with this controller? Specifically:

What are the critical layout considerations (e.g., component placement, thermal management, routing guidelines) for ensuring stability and performance?

Have you encountered any common pitfalls or performance issues when using the LM5122QMHX/NOPB in your designs?

Are there any reference designs, application notes, or manufacturer guidelines that you found particularly helpful?

Any insights, tips, or resources you can provide would be greatly appreciated.

Thank you in advance for your assistance!

Best regards,

[weepyenergetic]

I’ve worked with the LM5122QMHX/NOPB before, and yeah, layout can definitely make or break your design. One of the biggest things I learned is to keep the power loop as compact as possible. That means placing the input capacitor, high-side and low-side FETs, and the inductor really close together. When I didn’t do that, I had all sorts of noise and stability issues.

[designdev]

Great question! Have you checked TI’s reference designs or layout examples for LM5122QMHX/NOPB, especially regarding switching node placement and ground plane isolation? Would love to hear what worked for others too.