DC-DC output voltage dropping due to RF noise

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biswaIITH

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We are facing an issue where the output of the DC-DC(12V) drops to 1-2 V for few milliseconds when an SOM module tries connecting with the cloud. The DC-DC is designed using LM5146 IC from texas instruments

This is mostly due to RF noise we suspect.
Can anyone suggest any shielding technique to prevent the above?
 

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What is the power source for the DC/DC converter ? - if this cannot supply the power needed by the system ( 140 W by your estimate at full power ) the you will have the issues you are seeing.
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D.A.(Tony)Stewart said:
Does anyone see any problems with this Feedback gain and slope?
I would significantly reduce the 24k to boost error-correction gain in the <1ms pulse range.

View attachment 188407
Click to expand...
After Changing the R11 to 5.1K & R18 to 18K. The voltage drop issue is not happening. However, we have been continuously testing the board for the last 2 days.Will update further
 
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biswaIITH said:
After Changing the R11 to 5.1K & R18 to 18K. The voltage drop issue is not happening. However, we have been continuously testing the board for the last 2 days.Will update further
Click to expand...
Thanks for confirming my recommendation.

You can test a step load in both directions, on/off for over/undershoot and then define your performance specs you want to guarantee.
 
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