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Brad Albing

Zap! High Voltage Op-Amps Are Here

Brad Albing
Brad Albing
Brad Albing
3/28/2013 4:38:54 PM
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Blogger
Re: Packaging
And at the same time we're doing these clever tricks w/ the PC boards to pull away the heat, there are water cooled heatsinks available for the very fast uP.

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analog_man
analog_man
2/11/2013 5:15:34 PM
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Newbie
Re: Packaging
Apex was acquired by Cirrus Logic but recently spun back out as a private company. TO-3's are still a viable solution if you want to deliver 10 or 20A (as opposed to 10mA from this nice little LT device)

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eafpres1
eafpres1
2/10/2013 8:07:44 PM
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Blogger
Re: Packaging
Regarding heat removal, there are some interesting solutions that weren't there in the old days (depending on how old you are...).  Today, there are thermally enhanced PCB substrates that are combined with a metal layer to transfer heat through the dielectric to the metal layer which acts as a heat spreader.  In addition, a few companies have developed insulating thermal pads which are thermally conductive but electrically insulating; these can be used under the package to enhance heat transfer to the board without risking shorting to power.  

Bergquist, Laird Technologies, Dow Corning, and Chomerics among others make some interesting materials for these applications.  Anyone used enhanced thermal solutions in their high-power designs?

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Michael Dunn
Michael Dunn
2/9/2013 6:26:57 PM
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Blogger
Re: Packaging
They were definitely a main source. Didn't National acquire them? Oh, no, I'm thinking of Comlinear, who may have had similar. I find these acquisitions amusing. Comlinear is now TI, twice-removed...

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Brad Albing
Brad Albing
2/9/2013 10:29:38 AM
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Blogger
Re: Packaging
I recall those too - I think Apex made most of 'em.

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Michael Dunn
Michael Dunn
2/9/2013 12:05:12 AM
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Blogger
Packaging
It always surprises me how small power devices have become, relying on PCB planes to draw away the heat. I remember the good old days, when high-I/V op-amps came in big, multi-pin TO-3 types of cases. Yeah.

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JAYARAMAN KIRUTHI VASAN
JAYARAMAN KIRUTHI VASAN
2/8/2013 8:15:51 AM
User Rank
Master
High Voltage ADC
These HV opamps would be very useful. Another device from Linear Technology would be LTC4151 - High Voltage I2C voltage and current monitor. Works in a range of 7V to 80V. Has split I2C data pins to drive opto isolators - this feature is very handy. Could be very useful in power circuits.

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