From YouTube, Macro writes:
Perhaps what bother me the most about this type of power supply is that they become noisy as you reach the max output... any chances you would be willing to show how to increase their max output with out increasing in noise and temperature>???
There is not a magic way to "increase their max output." I'm not sure in this case if you mean voltage or current max, but I assume current. The only solution is to design the supply with higher margin or more headroom. If you know your load needs 2 amps, design your supply as if the max is 2.5 or 3 or 4 amps. (Though double might be the size and cost prohibitive.) You would not, however, want to go crazy and design something like a 10 amp supply for 2 amp of current. The components necessary for a 10 amp supply are way overkill for a 2 amp supply.
Here's another consideration, do not design a wide voltage range regulator. I mean a wide range between the input and output voltages. Recently I made a 3.7 volt to 12 volts boost converter. It had a tough time regulating the output. Why? Because remember in a switching regulator Pulse-Width Modulation controls how long the inductor is charged up. If there is a huge voltage range between input and output, the PWM gets close to an on-time of 90 or 95%. That on-time means there is very little room to reduce the ripple voltage.
So, design your current requirement with some margin. And design your voltage ranges limit the step up or step down.