high speed diode to-220 package for Aleph-x

[rwagter]

I recently bought 4 of peranders rectifier pcb's for my upcoming Aleph-x:



however the pcb only accepts to-220 package diodes. Most schottky's or the like which allow for the current used in the Aleph-x are in to-247 style package.

Anyone have a tip on high speed soft recovery diodes in to-220 package which allow for + 20A ?

Ralph

[roddyama]

Ralph,

The MUR 1560 is a TO220 and is good for 15A which would make the full bridge good for 30A. What amp would you be making that needs more than that?

[rwagter]

30A is indeed more then enough but as the master always says:
"it is never enough"

Since initial powerup give large current peeks to charge all caps I like to be on the safe side of things

With PSU designerII I get with 15V toroid a regular bridge, 220mF stubby (11.7mOhm) and a 8Ohm load a peak of 250A , hence my question

[roddyama]

Originally posted by rwagter
Since initial powerup give large current peeks to charge all caps I like to be on the safe side of things

With PSU designerII I get with 15V toroid a regular bridge, 220mF stubby (11.7mOhm) and a 8Ohm load a peak of 250A , hence my question

You need to use some form of inrush limiter.
Here is what Mr. Pass suggests

[diyman]

Anyone compared the sound of Schottky rectifiers to the MUR series? I have the Philips TO220 Schottky PBYR10100 rated at 100V 10A in mind. With adequate heatsinking, I think the voltage and current are good enough for the Aleph-X at +/- 22V and this item is fairly cheap.

ckt

[rwagter]

I know about de inrush limiters , I also use them in my Aleph5, but how can I calculate what the maximum inrush will be then, is it limited by the NTC's specs (5A in this case ?) or will it just notch the current ?

[roddyama]

Originally posted by diyman
Anyone compared the sound of Schottky rectifiers to the MUR series? I have the Philips TO220 Schottky PBYR10100 rated at 100V 10A in mind. With adequate heatsinking, I think the voltage and current are good enough for the Aleph-X at +/- 22V and this item is fairly cheap.

ckt

Here is an extensive discussion on PSU diodes.

Originally posted by rwagter
I know about de inrush limiters , I also use them in my Aleph5, but how can I calculate what the maximum inrush will be then, is it limited by the NTC's specs (5A in this case ?) or will it just notch the current ?

The CL 60 has a cold resistance of ~10ohms. It suggested that these be used in each of the 120VAC primaries that would make up your 240VAC or if you don't have this type of transformer, use 2 - CL 60's in series to effectively give you ~20ohms at power up. This will limit the primaries to 240/20 = 12A. Or as Peter suggests, use the CL 70 with a cold resistance of 15ohms.

[KevinLee]

Hello,

Fairchild's new 'Stealth' diodes are available in to-220 package 30 amp rating. I have used these and they are quite good.

I have also tried On-Semi's new soft recovery diodes and they were no good for my needs, I yanked them and replaced with the Fairchilds.

Thanks

KevinLee

[rwagter]

Hi kevinlee,

do you have a partnumber on those stealth diodes and where did you buy them

[KevinLee]

Hello,

I ordered the parts from fairchild as samples. I do not have the part number handy but you can search their site for 'stealth' and you will find some.

Good luck

KevinLee