how to reduce smps noise

Thread Starter

kavyaranibhee

Joined Oct 26, 2017
9
thank you
Hello,

Also in some datasheets there are optional filters given in the example schematics.
Here is one taken from the LM2596 datasheet:

View attachment 138012

Bertus
i connected dc to dc coverter lm2596 for that also am getting noise.... what to do?
noise is 800mv.
i given input for dc to dc converter from linear regulated power supply then also am getting noise....
 

bertus

Joined Apr 5, 2008
21,942
Hello,

I don't quite understand you.
How are things connected?
Can you post a diagram?

Did you implement the extra filter given?

Optional_ripple_filter.png

Bertus
 

Thread Starter

kavyaranibhee

Joined Oct 26, 2017
9
Hello,

I don't quite understand you.
How are things connected?
Can you post a diagram?

Did you implement the extra filter given?

View attachment 138016
as u told lm2596 buck regulator like that i have lm2596 dc to dc converter i connected that to the smps output.....
for that also am getting noise...


Bertus
i have lm2596 dc to dc converter i connected that to the output of smps.....
for that also am getting noise.

in this image i connected lm2596 dc to dc converter through power supply..
for that am getting peak to peak voltage 800mv how to reduce it?
P_20171017_144915_BF.jpg
 
Last edited:

bertus

Joined Apr 5, 2008
21,942
Hello,

A smps is a switching powersupply that will give you much more noise than a linear powersupply.
If you feed either of them to a DC-DC converter, you will introduce noise again, as a DC-DC converter is most likely a switching powersupply too.

Bertus
 

Thread Starter

kavyaranibhee

Joined Oct 26, 2017
9
Hello,

A smps is a switching powersupply that will give you much more noise than a linear powersupply.
If you feed either of them to a DC-DC converter, you will introduce noise again, as a DC-DC converter is most likely a switching powersupply too.

Bertus
thank you
 

Thread Starter

kavyaranibhee

Joined Oct 26, 2017
9
P_20171026_125903_BF.jpg
Hello,

A smps is a switching powersupply that will give you much more noise than a linear powersupply.
If you feed either of them to a DC-DC converter, you will introduce noise again, as a DC-DC converter is most likely a switching powersupply too.
i was using smps for the given block diagram am getting noise i have to reduce noise..
Bertus
 

bertus

Joined Apr 5, 2008
21,942
Hello,

You have three times an 24 Volts supply in your drawing.

kavyar_P_20171026_125903_BF.jpg

Are those all from the 24 Volts smps?
Is 800 mV disturbing the 24 Volts valve?

Bertus
 
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