Robert Kubichek wrote:


Percival P. Cassidy wrote:

On 03/20/06 10:26 pm Robert Kubichek wrote:

Anybody opened up one of these PWRgate devices to see what's inside?

What diodes are they using? I can't find any 80A Schottky diodes in
the Mouser catalog.

Does it consist of any more than two diodes, a resistor for the
float-charge capability, the connectors and the heatsink?



I would guess that it is 2 Schottky rectifiers back to back, with an
additional resistor-diode across the pair to keep a float charge on
the battery.....

The 203CNQxxx series from International rectifier comes to mind in
this application, as basically it is one modual that is surface
mounted...

Do a search for PWRgate, and go from there. You SHOULD be able to
brew your own
from the info found....



That's why I was asking. But why were you suggesting 200A diodes? I
find that Newark has the 80A International Rectifier ones (and 80A is
what WMR says is the rating of the diodes they are using) in stock,
cheaper, and with a lower voltage drop. (I guess that Mouser for some
reason simply doesn't handle IR products.)

"Perce" (aka Alan NV8A)

It's not the current rating, its the way you would mount the diodes, I
just like the idea of it being easier to isolate the circuit from the
heatsink.... I believe it's just a bit safer....

Bob N9LVU
Also, if you looked at the data sheet, at 80PIV 100A, the maximum vdrop is .7v
with .5v as the threshhold voltage...


Bob N9LVU