How does this work

[370forlife]

Found this interesting setup in a leadman for the 5v rectification. I don't understand how this works.

On the 5v, there is a 30A, 40V schottky. One of the outside legs is connected to the 5v output of the transformer. The other outside leg just goes to negative. This is true for both the schottky's on the 5v (silkscreened for two,) I recall the leadman lp-8860 based Real PC power in the JG bargain basement roundup had two of these 30A, 40V schottky's on the 5v, with the opposite leg cut off of each. So one would have one connected to the 5v pins on the transformer, the other had one that just went to negative.

Pic:



(BTW, all that terrible soldering is from the factory )

[stj]

Re: How does this work

probably designed to take a single diode with one end soldered to a heatsink mounted to the outer holes.

[everell]

Re: How does this work

Looks like someone at the factory forgot to install the diode on the other side of the heat sink. How many watts is this power supply supposed to handle?

[momaka]

Re: How does this work

My LP-6100D is arranged like that as well. Perhaps this would help you:
http://www.hardwaresecrets.com/article/327/9
Apparently it is possible to have the rectifiers arranged in this way. Looks like this would fall under configuration "B" in Figure 27 on that page. I still don't understand how that works, though.

[370forlife]

Re: How does this work

Looks like someone at the factory forgot to install the diode on the other side of the heat sink. How many watts is this power supply supposed to handle?

It was under the name of cheifmax 650W, no surprise, the transformer is labeled for 250W, but on the JG bargain basement roundup it did 291W.