I am building a power PCB which will take in 48V (at a max of 10A) and convert it to 5V (using a buck converter) and 7.4V (using a separate buck converter.) I am adding in reverse polarity protection and overvoltage protection. The power supply I will be using to get the 48V can be found here. It's not relevant, but adding in case it helps you to give your advice.
My question is: Do I need a large capacitor on the input power train? I have tentatively selected a 470uF aluminum capacitor.
I would like to have a low ripple input power to the buck converters. However, the buck converters have their own (smaller) capacitors on their VDD pins. Are these smaller ones enough? Note that the 48V port goes directly into the buck converters. Here is the buck converter design. Vin would be the 48V from the input power train schematic above: