diyAudio

diyAudio (https://www.diyaudio.com/forums/index.php)
-   Pass Labs (https://www.diyaudio.com/forums/pass-labs/)
-   -   Heatsinks for Bosoz? (https://www.diyaudio.com/forums/pass-labs/53396-heatsinks-bosoz.html)

Kari 13th March 2005 12:05 PM

Heatsinks for Bosoz?
 
2 Attachment(s)
Hi,
as i'm currently drawing pcb for a X-Bosoz with ccs i'm wondering if a heatsink is required? Acording to my cim about 40mA is floating trough each of the diffpair fets and around 80-100ma trough the ccs. 60V * 0,04A = 2,4W for the diff fet and i recon that it should work without a heatsink, right? For the ccs the figures would be 9V* 0.1A = 0.9W.

Any comments?

Thx,

Kari

metalman 13th March 2005 06:38 PM

Kari,

I think you will definitely want heatsinks. For my BZLS variation I used my aluminum chassis as the heatsink for all my FET's, and the chassis is noticeably warm to the touch when operating. Check the datasheets for the IRF610 for heat transfer from package to air as a check, as I may have been overcautious, but I'm pretty sure I did the check and found the FET's would overheat.

Cheers, Terry

Kari 13th March 2005 08:48 PM

2 Attachment(s)
Thx Terry,
I checked the datasheet and according to that the fets would run at 2,4 * 62 = 148 deg C :hot: :hot: . However, the adding of heatsinks did screwup my symmetry a little bit......

/Kari

steenoe 14th March 2005 07:58 AM

Very interresting layout, Kari:) Are you planning on using MKP's
for the caps? Its quite roomy for the caps on the pcb. Looks good:cool:

Steen.

Kari 14th March 2005 04:00 PM

The footprints for the caps are Mundorf MCap 33uF + some odd mm to both axis. This way i get to experiment with different caps.

I've also moved the ccs fet in the "middle" of all three so now i have a more symmteric layout. I'll post a pic as soon as i get home.

/Kari

Kari 14th March 2005 06:21 PM

2 Attachment(s)
Here's a pic of the updated board.

/Kari

steenoe 14th March 2005 07:33 PM

Beautyful:cool: Very symmetric layout. Are you considering a PSU board also?

Steen.

Kari 14th March 2005 09:03 PM

Yep, i will do a psu board also. I was first considering to integrate everything to the same board (cheaper) but desided to make two boards instead.

/Kari

steenoe 14th March 2005 09:20 PM

Quote:

desided to make two boards instead.
That is propably a good idea:) Gives you flexibilty if you want to move the PSU to a separate chassis. (like me for one);) Is the connection pads layed out for terminal blocks?

Steen.

Coulomb 15th March 2005 04:41 AM

Quote:

Originally posted by Kari
Yep, i will do a psu board also. I was first considering to integrate everything to the same board (cheaper) but desided to make two boards instead.

/Kari


Will you make some boards available to others, Group Buy maybe?

Anthony


All times are GMT. The time now is 09:09 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 17.65%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio

Wiki