Quote:
Originally Posted by Craig Sawyers
Either go for TO220 packaged devices and heatsink them, or use a lower voltage drop sort such as a power Schottky.
|
I've just been looking at a little more detail about power Schottkys. It is true that signal level devices have a small voltage drop, power Schottkys are very similar to conventional junction diodes, with a drop of about 0.7V to 0.8V at a forward current of 10A or so, and 0.55V at 1A.
That is for 150V repetitive PIV.
You can get 650V plus, but only is Silicon Carbide Schottkys - and they have a forward drop of about 1.4V. The advantage is very high operating temperature.
The real advantage of a power Schottky is no, or exceptionally low reverse recovery, which is a big advantage when used in a switched mode power supply.
But, in spite of my comment of "use a power schottky", there is no real advantage in a regular linear power supply.
Craig