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Heatsinks for Bosoz?
Heatsinks for Bosoz?
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Old 13th March 2005, 12:05 PM   #1
Kari is offline Kari  Sweden
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Question Heatsinks for Bosoz?

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
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Old 13th March 2005, 06:38 PM   #2
metalman is offline metalman  Canada
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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
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Old 13th March 2005, 08:48 PM   #3
Kari is offline Kari  Sweden
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Thx Terry,
I checked the datasheet and according to that the fets would run at 2,4 * 62 = 148 deg C . However, the adding of heatsinks did screwup my symmetry a little bit......

/Kari
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Old 14th March 2005, 07:58 AM   #4
steenoe is offline steenoe  Denmark
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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

Steen.
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Old 14th March 2005, 04:00 PM   #5
Kari is offline Kari  Sweden
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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
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Old 14th March 2005, 06:21 PM   #6
Kari is offline Kari  Sweden
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Here's a pic of the updated board.

/Kari
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Old 14th March 2005, 07:33 PM   #7
steenoe is offline steenoe  Denmark
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Beautyful Very symmetric layout. Are you considering a PSU board also?

Steen.
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Old 14th March 2005, 09:03 PM   #8
Kari is offline Kari  Sweden
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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
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Old 14th March 2005, 09:20 PM   #9
steenoe is offline steenoe  Denmark
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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.
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Old 15th March 2005, 04:41 AM   #10
Coulomb is offline Coulomb  England
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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
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