Jester
Full Member level 6
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I have a LMZ14201 buck converter circuit (3.3V dc output), the output is well behaved when running, it has a soft start feature and ramps up very nicely. However sometimes on power-up (perhaps 1 in 10), prior to the soft start circuit and exactly at the moment of energization there is a short spike, sometimes two of them that last about 50nS at the 3.3V output, the peak voltage is about 7V. This circuit powers various digital IC's and I want to make sure they don't get damaged from these 50ns spikes.
The energy would obviously be quite low because of the short duration, should I be concerned and add a TVS on the output, or are these spikes too short to be concerned about?
When the spikes occur they are approximately where the red bar is in the first image.
The energy would obviously be quite low because of the short duration, should I be concerned and add a TVS on the output, or are these spikes too short to be concerned about?
When the spikes occur they are approximately where the red bar is in the first image.
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