Apology for the ambiguous Topic.
So I have 12V input from an SMPS to drive a circuit that requires 4V and 5V.
Because of circuit limitations, the 12V output feeds a buck converter in which drives some devices along with another buck converter to obtain 4V.
Is there a problem with this configuration in the long run ? or should I rewire the circuit as to 12V output feeds the Two buck converters directly?
This sounds like a matter of connecting multiple buck / SMPS (Switch mode power supplies) in a cascade arrangement.
Your description is rather confusing.
Can you make a schematic of your current and your proposed configurations and post that. A picture of a hand drawn circuit would be fine.
OK. Have a look at this: Is it okay to use a buck converter followed by another buck converter.
I'd power the "4V" buck via the "12V" SMPS.
But I guess that, as the load changes, there will be a period of instability as the various power supplies "fight" with each other to reach some equilibrium.
For a more rigorous technical analysis, look at this: https://arxiv.org/ftp/arxiv/papers/1802/1802.07159.pdf
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