Favorite Catch Diode (Switching Pwr Sply)

[RST Engineering \(jw\)]

It has been a very long time since I needed anything other than good old 12
volts from a battery for design. As a matter of fact, the last time I
needed higher voltage I got it with a WWII surplus dynamotor for the plate
supply of a 6146 on 6 meters ... that gives you an idea of the time frame we
are talking about.

However, I've recently been looking at a high power FET design and it would
help if I could get 20 to 30 volts for the supply. The chips to do the
switching are relatively easy to compare as are the inductors. I'm
wondering if anybody has a favorite series of catch diodes that they like to
use -- we're talking an amp or two.

Preferably something that is garden variety available on the US side of the
pond.

Jim

 

[Genome]

It has been a very long time since I needed anything other than good old 12
volts from a battery for design. As a matter of fact, the last time I
needed higher voltage I got it with a WWII surplus dynamotor for the plate
supply of a 6146 on 6 meters ... that gives you an idea of the time frame we
are talking about.

However, I've recently been looking at a high power FET design and it would
help if I could get 20 to 30 volts for the supply. The chips to do the
switching are relatively easy to compare as are the inductors. I'm
wondering if anybody has a favorite series of catch diodes that they like to
use -- we're talking an amp or two.

Preferably something that is garden variety available on the US side of the
pond.

Jim

UF4XXX 1A
UF54XX 3A

Or some such, could be as old as The Sun.

GE made them.

DNA

 

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RST Engineering (jw) wrote:
[...]

I've recently been looking at a high power FET design and it
would help if I could get 20 to 30 volts for the supply. [...]
I'm wondering if anybody has a favorite series of catch diodes that
they like to use -- we're talking an amp or two.

Preferably something that is garden variety available on the US side of the
pond.

Jim

Thru-hole: 1n5819 / 1n5822 (40v, 1A / 3A schottkys) are old
workhorses.
SMD: MBR340 (OnSemi 3A, 40V) & SK34 (generic, e.g. Diodes Inc.),
both schottkys, aren't bad.

James Arthur

 

[Joerg]

Hello Jim,

Check out the ON Semi MUR and MURS series. My favorites when it comes to
really fast diodes for power apps.

Regards, Joerg

 

[Ken Smith]

Hello Jim,

Check out the ON Semi MUR and MURS series. My favorites when it comes to
really fast diodes for power apps.

The MUR1660 is nice. You get two 8 amp fastish diodes in a TO220
package.

The new SiC diodes are interesting but at less than about 40V they aren't
really needed.