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You can always design a linear regulator to go to 0V, and some you can buy do that. It's just that the most commonly used (the LM317) can only go down to 1.2V without additional circuitry.Linear regulators cannot go to 0 volts.
I am not knowing SMPS supplyAre you sure you want linear and not switching?
yes because for learnigDo you need 5 amps at all voltages? This will make power dissipation very high at low voltage.
So this is just a paper design for school?yes because for learnig
NoSo this is just a paper design for school?
PakistanWhere are you located?
i design power supply using three pin regulatorWhat parts and skill level do you have?