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Forum Post: RE: LM20133MH 5V to 4V DC-DC Converter Oscillates when starting up into Full Load

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I have tried reducing the output inductor value and this eliminates the oscillation problem into full load.  However, the output switching noise is much higher (on the order of 400 mV p-p with Lout = 2.2 uH where the original value was <100 mV p-p with Lout = 4.7 uH).  Also, I have not seen significant reduction in the amount of transient droop when I reduce the Lout value and increase the Cout value.

 

I will try removing R155 to determine if the LMP8646 is contributing to both issues.


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