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I have been designing (using)various Linear tech power supply chips. It seems current mode is the way to go. You can use their simulation tools. It seems that the whole control of the whole power supply boils down to one external pin with two capacitors and a resistor that you attach to it. You pretty much start off with what their data sheet gives you , then use their simulation tool (with all kinds of "trust me" built into it) and then tweek those three components. And the reponse is pretty awesome. Then you get the chip and if you are diligent you can switch resistors and look at the current response and the results are mostly very good. I see the good responses, I believe it is solid, but do I know the transfer function ? ( the current mode took a pole out ?!!! AWESOME).
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