1.2V, 3.3V, 5V at various current levels but by far the highest being 1.2V@2A, but this is being designed for 5A. Input voltage is 6V-24V.
However, after reading the article again, it seems to imply that the beat frequency and low PSRR against switching noise isn't a problem if the clocks are actually the same frequency (regardless of the particular phase alignment chosen). But after thinking about it, it seems that the beat frequency phenomenon and low PSRR for switching noise of other converters are two separate issues, but have to work together for switching noise to propogate to the converter's output.
Could anyone help my clear up my understanding of this? This is my understanding so far:
1. Different clocks will cause beat frequencies (ie. the switching edges of one converter will slowly move through the period of another converter through consecutive cycles)
2. Switching noise caused at the input by switching converters will appear at the output of other converters in parallel because PSRR is poor at high frequencies
3. If a switching converter is currently in the "off" phase then switching noise from other converter cannot be propogated to the output (is this right? it intuitively makes sense to me)
So I am drawing the following conclusions:
A. So if my understanding is correct, if the clocks were synchronized, then #1 would no longer be an issue making the switching noise more predictable since the swithing edge of one converter would always occur at the same time in the cycle of another converter.
B. If the phases were then aligned (in addition to clock syncing) so the switching edge of one converter occured during the on-time of another converter than the switching noise would be worse than scenario A due to #3 since it would always be propogated through with optimum efficiency without fail. However, though the magnitude of the switching noise is worse than A, it is more predictable since #1 does not cause the switching edge of one converter to slowly move through the period of another converter.
C. Similar to B, but now we align the phases so that all switching edges happen at the same time. All switching noise now occurs at the same so it is worse in a sense, but it is uncertain whether it is passed to the output since it is on the threshold of on-off for the converters.
D. So, theoretically, if you arranged the the switching edges of converters so they would only occur during the off-time of other converters, switching noise would never propogate. I say theoretically because this would require asynchronous switching or place limits on the the duty cycles.