LM2576HVS-ADJ/NOPB

Ramana Murthy

Dear Sir,

I am using LM2576HVS-ADJ/NOPB to power the IC UC3526DW.
Input Voltage: 24V DCLM2576HVSADJ.pdf
Output Voltage: 12 V DC
Current Max: 1A

My voltage output waveform is not clean having some switching noise observed on DSO.
Please verify my schematic attached here and suggest changes if any changes are required.

Regards
Murthy

over 4 years ago

0 Frank De Stasi over 4 years ago

TI__Guru 64395 points

Hello

Can you send a scope waveform of the ripple you are seeing.

Also, can you send a view of your PCB layout.

You may need a post filter on the output to help clean up the ripple.

Thanks

0 Frank De Stasi over 4 years ago in reply to Frank De Stasi

TI__Guru 64395 points

Hello

Please see the resources below.

Also, please be sure that the output does not exhibit

any low frequency oscillation in the 1kHz range.

Thanks

https://training.ti.com/understanding-measuring-and-reducing-output-noise-dcdc-switching-regulators

https://training.ti.com/sites/default/files/understanding_measuring_and_reducing_outputnoise_0.pdf

https://e2e.ti.com/blogs_/b/powerhouse/archive/2016/07/27/how-you-measure-your-ripple-can-make-you-or-break-you

https://training.ti.com/power-tips-measuring-vout-ripple-dcdc-converters

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LM2576HVS-ADJ/NOPB