Hi,
I just came across a strange behaviour of an LM2676. Datasheet says it has a switching frequency of 260kHz which I have seen in many designs. But now I just switched a proto of my new design on and it has a switching frequency of only 130 kHz resulting in twice the output ripple. When taking away the load and bringing it back it sometimes turns the frequeny to 260 kHz. Two boards of the same design behave like that.
Can anybody explain that?
Thank you
Martin