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Old 24th June 2013, 04:30 AM   #181
tomchr is online now tomchr  United States
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PM sent.
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Old 24th June 2013, 07:33 AM   #182
euro21 is offline euro21  Hungary
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Quote:
Originally Posted by matej8888 View Post
.. because they are not easy to get in Europe...
Try Farnell.

Farnell element14 | Electronic Component Distributors

LT3080EST#PBF - LINEAR TECHNOLOGY - IC, LDO REG, ADJ, 1.1A, SOT223 | Farnell United Kingdom
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Old 24th June 2013, 11:15 PM   #183
tomchr is online now tomchr  United States
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Except you want the D2PAK version not the SOT223.

LT3080EQ#PBF - LINEAR TECHNOLOGY - LDO, REG, 0V TO 36V, 1.1A, 5D2PAK | Farnell United Kingdom

~Tom
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Old 21st July 2013, 03:17 PM   #184
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Would anyone be willing to share their specification for a heatsink for Tom's regulator? Type of stock, size, location of mounting hole, hole thread size, etc? (If you're not using Heatsink USA, let us know who you are using.)

This might include thoughts of how or if to mount the PCB to the heatsink, as well as how to securely mount the entire assembly to something else.

I know I'd benefit from someone who's been there and done this, and maybe we could get some benefit from standardization.
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Old 22nd July 2013, 06:54 AM   #185
tomchr is online now tomchr  United States
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In my 300B amp, I actually used an old heat sink from Assmann. The profile is V 5434. At 75 mm length, its thermal resistance is about 1 K/W. I fished two of these out of a tub skid at a junkyard in the outskirts of Copenhagen when I lived there. I bought them for the raw aluminum cost.

Assmann is represented in the US, though, none of their distis seem to carry heat sinks.

I've used Wakefield in the past as well.

~Tom
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Old 22nd July 2013, 06:39 PM   #186
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Thanks, Tom.

I was mostly concerned with specifying the location, size and thread of the drilling hole for the MOSFET.

It also occurred to me that it may be desirable to mount the PCB to the heatsink to strain-relieve the MOSFET connections. If so, same questions.

Your thoughts?
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Old 23rd July 2013, 06:15 AM   #187
tomchr is online now tomchr  United States
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Definitely mount the PCB. In my amp, I bent the leads on the mosfet 90 degrees and had the PCB parallel to the heat sink. I drilled and tapped M3x0.5 mm holes for the board and the MOS device. Use a thermal washer between the MOS device an the heat sink.

You never want the board just dangling off the FET leads. That's a recipe for disaster (and metal fatigue).

~Tom
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Old 11th August 2013, 07:14 PM   #188
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I'm having difficulty locating a thermally conductive insulator for the TO-247 MOSFET package. Does anyone have any suggestions?
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Old 11th August 2013, 08:04 PM   #189
tomchr is online now tomchr  United States
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Digikey P/N BER109-ND.

~Tom
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Old 11th August 2013, 08:52 PM   #190
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Many thanks.

Imagine - not under "insulators", where you can find stuff for TO-220's , but under "Thermal pads - sheets."

You might want to add this to the BOM on your website.
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