Re: Dumb Q: Why few shottky bridges?

Hello Chris,


I want to explain to you why I replied to Joerg this way. He bashed the
absolutely valid and intelligent answer of Sophie.


No bashing here, at least it wasn't meant to be.


"A shottky bridge will not run any cooler than a regular bridge when it is
rectifying 50 or 60 Hz (line or mains) power.... the schotky application
is for high frequency switching power supplies and the like where the
faster recovery time of the schotky is required."

So please do not interfere and rather learn to spell "Schottky" in the
first place (not that others also should).

Provided you are rectifying a low voltage at a high current, the Schottky
diode will be be more efficient than the PN diode, both at high frequencies
and also at low frequencies. The advantage of the Schottky will of course
be greater at high frequencies. Whether or not the diodes are connected in
a bridge does not alter this situation. As you pointed out, Schottky
diodes are inferior for use at high voltages.


Check out the MBR1000 from ONSemi. It's a 100V/1A Schottky. Reverse current under 40uA at 80V and a quite toasty 100C. Not bad, ain't it?

The trick is not to oversize the diode for the task.

--
Regards, Joerg

http://www.analogconsultants.com
.