Have you considered using devices from Linear Technology (now Analog
Devices) ? You can run extensive simulations with LTSpice, using accurate
models for their ICs (I assume they are encrypted spice models).
I dont do bode plots for any of my designs; instead I rely heavily on spice
simulations and run a lot of corner cases, varying component values, etc.
As your design improves, you will see that overall behavior is not
sensitive to component values. For example, I'm working on a DCDC converter
and I had horrible ringing; changing a capacitor value 2X had a major
impact on the ringing. After some other fiddling, even a 10X change in
capacitance no longer increases the ringing appreciably.
One thing to really watch-out for is inductor current; make sure you stay
well-clear of the saturation current (Isat) spec for the device. If you are
using a transformer (coupled inductors) , make sure your circuit works
nicely with non-ideal conditions such as finite DC resistance (usually in
the datasheet), and non-ideal coupling (K < 1). All kinds of bugs come
crawling out of the woods; much easier to deal with them with a simulator
than a real circuit on your workbench.
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