I'm doing a PCB where there are 3 SMPS: one boost(12v to 48v, 1 amp max) and one buck converter(5v to 4v, 4 amps max) functioning at the same frequency(same timer in microcontroller). the other converter is a synchronous buck(~10v to 8v, at 1 amp). The first pair of SMPS will switch at 400 kHz(perhaps less, if noise becomes too problematic) and the 3rd at 50kHz or less.
Now, I'm having problems designing my board mainly because of: ground bounce issues; interactions between inductors(undesired transformer); cross talk of the current loops in the 4v-4amp buck and the other lower current converters;... I know that the frequencies here are not very high for some of you, however that is still a lot of current at that frequency in my opinion, and I'm hesitant about some strange effects showing up. So, can you give me some pointers about the design of the board? I have enough flexibility with space, but the board only has 2 layers... Ask more details if needed.
edit: the load in the first buck is an electrolyzer; the load in the boost is a led panel; these two loads will be functioning at the same time. the source in the second buck is a fuel cell and the load is an electric toy train.
anymore details I can add?