In a project, I am using the PTN78020H: http://www.kynix.com/Parts/3576609/XG7.html power supply, and it has a recommended circuit (from the datasheet linked above) that looks like this: Circuit diagram for power supply
Now on the input, it requests a massive 4 x 4.7uF ceramic capacitors. I’ve had a look around and haven’t found any place selling through whole ceramic capacitors in values anywhere near that.
Typically a ceramic cap is used to filter high frequencies, and electrolytic have much worse performance, so I don’t want to switch all the input caps to electrolytic, but would it be feasible to, say, use 10uF electrolytic and 1uF ceramic? Tantalum caps come in the 4.7uF capacitance range, and I believe have better performance than electrolytic?
My question is pretty much: Assuming I can’t get hold of 4.7uF ceramic capacitors, what should I do?