Salas hotrodded blue DCB1 build - Page 202 - diyAudio
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Old 12th July 2012, 06:29 PM   #2011
jeff517 is offline jeff517  United States
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Ive read that matched LEDs are, and are not necessary. Now is this for Vref? or CCS?
I'm just figuring all this stuff out. And also Does it matter if I have more than the required V all my LEDs measure at between 1.895 Vf and 1.915 Vf. So 5 x any of them will be more than 9V for Vref and 3 x any of them will be more than 5.4V for CCS. Or should I just stick'em on the board and not worry?
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Old 12th July 2012, 08:39 PM   #2012
Salas is offline Salas  Greece
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No worries with your LEDs they are tight.
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Old 12th July 2012, 08:47 PM   #2013
BigE is offline BigE  Canada
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What sort of heatsinking is necessary for the DCB1 running @ 600 ma?

Is the floor of the enclosure plus spreaders good enough, or do we need to use amplifier heatsinks?

Does the enclosure need to be ventillated?
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Old 12th July 2012, 08:51 PM   #2014
Salas is offline Salas  Greece
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~1.5C/W per rail for two Mosfets each or better. Ventilation of course. Your criterion should be no more than 60C on metal with any sinking plan.
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Old 13th July 2012, 02:18 PM   #2015
BigE is offline BigE  Canada
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I'm not sure I understand. 1.5 C/W each mosfet ? Or 3.0 each mosfet and 1.5 for both connected to one sink?

If 3, then board level will work, otherwise they start to get BIG
Thanks.
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Old 13th July 2012, 02:27 PM   #2016
Salas is offline Salas  Greece
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Quote:
Originally Posted by BigE View Post
3.0 each mosfet and 1.5 for both connected to one sink
1.5W/C parallel sink per side bolting the side's 2 Mosfets to it, or 3W/C per Mosfet.
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Old 13th July 2012, 02:32 PM   #2017
BigE is offline BigE  Canada
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Excellent! Thank you!

That should be enough to buy all the external parts! Hopefully, I can find some the fit!

Cheers!

Maybe this?
http://www.aavid.com/products/standard/530002b02500g

Last edited by BigE; 13th July 2012 at 02:36 PM. Reason: added url
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Old 13th July 2012, 04:28 PM   #2018
Renron is offline Renron  United States
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Any issues (inductance) with using a 10R 5w Wirewound for setting the mA level?
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"If it doesn't work properly, hope it catches on fire"- Nelson Pass @ BA3
"I fired up the prototype. Literally." The Prophet Pass.
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Old 13th July 2012, 06:17 PM   #2019
Salas is offline Salas  Greece
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No issues.
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Old 13th July 2012, 06:48 PM   #2020
Salas is offline Salas  Greece
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Quote:
Originally Posted by BigE View Post
Excellent! Thank you!
Maybe this?
530002B02500G - Board level heatsinks
No, get sink with flat back surface side mounted along the PCB edge. Something like this that can accommodate both Mosfets each side of the PCB.

SK 92/100 SA - FISCHER ELEKTRONIK - HEAT SINK, 100MM, 1.4C/W | Farnell United Kingdom
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