Post #1655784

Power supply design question: I want to turn 20V/5A (USB PD) into 1.2V, 1.8V, 3.3V and 5V voltage rails. Having 2 stages is more efficient than direct conversion, so I plan to generate 5V/20A and then derive the other values from that. However I am unsure about the output caps. The 5V output rail should have around 300uF and I am currently designing the 1.2V/20A rail. The calculator tells me I should use a 150uF capacitor at the input. Can I just rely on the output caps or do I have to add that?