Input voltage variations and its problems LM2596 - 5V

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azadfalah

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Hi, my friends, I hope you're fine

I use the LM2596 regulator to convert a voltage of 24 volts to 5 volts
In some cases, with voltage variations from 25 volts to 35 volts for a few moments
IC MCP2551 that feeds on this regulator is damaged But the 3.3-volt linear regulator that feeds on the LM2596 does not hurt



LM2596 5v "The feedback is directly connected to the output capacitor"
Input capacitor = 2200uf 35v
Output capacitor = 2200 uf 35v
inductor = 100uh 2A
current = between 500 and 1500 mA
Diode = SS34


How can I fix this problem?
Thanks
 


Well, what exactly IS "this problem"? Does the LM2596 go out of regulation? Is there a transient? Without more information, there's nothing to tell you.
 

Hi,

In addition to Barry:

The LM2596 should be able to handle the input voltage variations.
But you need to follow the datasheet recommendations for the switcher to operate correctly.
This means:
* suitable PCB layout
* suitable part values
* suitable part types
Instead of (unnecessary) big capacitors, I'd rather use low ESR types.

And you need an inductor that doesn't saturate during critical regulation situations.

If you need further help you should show us the PCB layout, your wiring and some scope pictures of the problem.

Klaus
 

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