TPS54340B-Q1: TPS54340B-Q1 output is getting doubled.

Hi Suryakant,

Can you provide any waveforms that showcase 3-5 switching cycles of the start-up, steady-state (VIN, VOUT (at C8 and at the output), SW node, and COMP? A zoomed-out view would also be helpful. 

I await for the response,

Richard

Hello Richard,

Thank you for your prompt response.

Please find attached Waveforms.

waiting for your responce.

Hi Suryakant,

Can you provide me your layout? Your COMP pin voltage is exceeding the COMP abs max, so either it is the scaling, or the part is really damaged..

Additionally, I noticed your SW node is not particularly stable. It could be due to your compensation network, but we should go step by step. 

Regards,

Richard 

Hello Richard,

Thank you for your response.

We have recaptured the COMP and Switch waveforms on fresh assembled PCB and PCB gerber.

switch and comp both and individual waveforms are attached for you reference.

waiting for your response.

Gerber for RTU_WP500_PS_vias open.zip

Hi Suryakant,

Thanks for providing the waveforms. The main thing that worries me is how the COMP looks like it is within abs max and then when probing with SW it becomes very noisy. Either way, I think it looks very unstable, so I will take a look at the layout. Please give a few days for review. 

Regards,

Richard

Hello Richard,

Thank you for your response.

I will wait for your feedback.