LMR16030: LMR16030 Resonance noise Issue

Hi Tyler,

What do you mean by Resonance noise ?

Can you please share the Schematic and Layout of the design . Also please share the SW node waveform .


---Ambreesh

Hi. Ambreesh.

First of all thanks you for your reply.

Resonance noise --> Resonant noise (Occurs in the inductor)

Schematic --> It is the same as the webench design.

The scope waveform of the SW pin will be measured and raised again.

Thanks.

Regards,

Tyler

Hi Tyler,

What you are hearing(noise in inductor ) is the result of unstable switching . You can double check that with the switch node waveform . Make sure that you are getting stable switching waveform at fixed frequency .
What is the load at which you have this issue ?
The Layout can be a big contributor in this issue . In order to debug further please share the Switching waveform as well as the Layout .

Ambreesh

Hi Ambreesh.

The waveform has been reloaded on the main question screen.
please check.

Thanks.

Hi Tyler,

The SW node waveform seems to be OK . Is there any jitter or something you see while probing the SW node ?What is the make of the inductor ?
Further reviewing your Schematic , you don't need 22uH inductance . Use 10uH inductor with two 22uF capacitor at the output .

--Ambreesh