high speed diode to-220 package for Aleph-x - Page 2

rwagter · 9th February 2004, 03:59 AM

Found it !!, now hopefully they will send me 20 pcs

hacknet · 9th February 2004, 03:07 PM

please don`t abuse the system....

Mad_K · 9th February 2004, 05:17 PM

I'm afraid that nice little pcb will

burn

under the punishment of the current draw of an AX combined with the voltage drop of the stealth-diodes...

KevinLee · 9th February 2004, 05:58 PM

Hello,

What do you mean by voltage drop? The diodes will be configured as a bridge.

I know the input voltage will increase by a factor of 1.4.

Peranders will know if his circuit traces can handle 30 amp draw.

KevinLee

Mad_K · 9th February 2004, 06:24 PM

I mean Vf, the forward voltage drop of for example ISL9R3060P2 under 8A current draw is something like 1-1,5V. Assuming chassi-temp of 50'C this translates to 1,25V*8A=10W*13'C/W=130'C+50'C=180'C heatsinktemp. And they're 175'C devices

Nelson Pass · 9th February 2004, 08:44 PM

We are currently using the ST Micro BYW99W-200, which is
a dual "high efficiency, fast recovery" 35 amp diode at 200
volts, and have been very happy with it.

It's remarkable for us to have converted to exotic rectifiers,
as we previously were very sceptical, but we did find a distinct
sonic improvement, and they also made it easier to meet
RF noise emission standards.

Mad_K · 9th February 2004, 09:23 PM

That's interesting... TO-247 case. They are about twice as efficient as the StealthTM diodes from Fairchild. But how do you configure a bridge with dual diodes with common Cathode? And how do you mount them?

Nelson Pass · 9th February 2004, 09:29 PM

We treat them as a single diode by paralleling them.

UrSv · 9th February 2004, 10:49 PM

Quote:

Originally posted by Mad_K
I mean Vf, the forward voltage drop of for example ISL9R3060P2 under 8A current draw is something like 1-1,5V. Assuming chassi-temp of 50'C this translates to 1,25V*8A=10W*13'C/W=130'C+50'C=180'C heatsinktemp. And they're 175'C devices

Quite, but does the diode not conduct only half the time meaning half this dissipation?

rwagter · 9th February 2004, 11:17 PM

And I can always attach them wil L-profiles to my main heatsinking which is rather overdone for future upgrades, thus making the heatsink <0.3 C/W

9th February 2004, 05:17 PM	#13
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	I'm afraid that nice little pcb will burn under the punishment of the current draw of an AX combined with the voltage drop of the stealth-diodes... __________________ Mads K

9th February 2004, 06:24 PM	#15
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	I mean Vf, the forward voltage drop of for example ISL9R3060P2 under 8A current draw is something like 1-1,5V. Assuming chassi-temp of 50'C this translates to 1,25V8A=10W13'C/W=130'C+50'C=180'C heatsinktemp. And they're 175'C devices __________________ Mads K

9th February 2004, 09:23 PM	#17
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	That's interesting... TO-247 case. They are about twice as efficient as the StealthTM diodes from Fairchild. But how do you configure a bridge with dual diodes with common Cathode? And how do you mount them? __________________ Mads K

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9th February 2004, 03:59 AM	#11
rwagter diyAudio Member Join Date: Jul 2002 Location: Netherlands	Found it !!, now hopefully they will send me 20 pcs

9th February 2004, 03:07 PM	#12
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	please don`t abuse the system....

9th February 2004, 05:58 PM	#14
KevinLee diyAudio Member Join Date: Oct 2002 Location: Winnipeg MB Canada	Hello, What do you mean by voltage drop? The diodes will be configured as a bridge. I know the input voltage will increase by a factor of 1.4. Peranders will know if his circuit traces can handle 30 amp draw. KevinLee

9th February 2004, 08:44 PM	#16
Nelson Pass The one and only Join Date: Mar 2001	We are currently using the ST Micro BYW99W-200, which is a dual "high efficiency, fast recovery" 35 amp diode at 200 volts, and have been very happy with it. It's remarkable for us to have converted to exotic rectifiers, as we previously were very sceptical, but we did find a distinct sonic improvement, and they also made it easier to meet RF noise emission standards.

9th February 2004, 09:29 PM	#18
Nelson Pass The one and only Join Date: Mar 2001	We treat them as a single diode by paralleling them.

9th February 2004, 11:17 PM	#20
rwagter diyAudio Member Join Date: Jul 2002 Location: Netherlands	And I can always attach them wil L-profiles to my main heatsinking which is rather overdone for future upgrades, thus making the heatsink <0.3 C/W

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