Goring, Steve wrote:
> Would anybody be able to help by explaining how you connect
> the fast diodes that come in the to220 packages.
> My application is for a freewheeling diode in a pwm motor cct.
> The ctr pin of the diode is the K and I suspect that the outer
> two are the A's.
> Am I using the correct part or is there a better one for what I am
> trying to do.

Download the spec sheet for the part. It will show which pins are
which. Many TO-220 diodes don't have all three leads attached, and
they may require a connection to the tab. There are several possible
configurations, though, so make sure you get it right by either
checking the specs or using a meter. Most have two diodes in one
package, with a tab (center lead) that is either common anode, common
cathode, or a junction of one A and one K. Physical connection is the
same as for any other TO-220 device -- solder it to a PCB. Heatsinking
may or may not be required. You will need to read the spec sheet to
see if you have an appropriate part for your application. Selection
criteria are voltage drop, current/power rating, reverse recovery
time, and PIV. You will need to decide if it will work based on the
voltages and frequencies you want to switch. Generally, it's
preferable to choose the part based on the application rather than
getting parts and then determining if they are suitable...

--

Mike Poulton
mpoulton@mtptech.com
MTP Technologies
KC0LLX

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