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Old 10th February 2013, 04:58 AM   #21
gootee is offline gootee  United States
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I posted a spreadsheet that will simulate a linear power supply with the worst-case load, with variable transformer ratings, reservoir capacitance, load resistance, rated output power, and basically everything else you need, which is attached to the post at:

Power Supply Resevoir Size

It uses a numerical solution of the differential equations for the circuit. So no approximations are used.

A downloadable PDF file describing the spreadsheet, and the solution method, et al, is attached to the post at:

Power Supply Resevoir Size

However, I recommend using LT-Spice, since it is much more flexible and powerful. It is a free download from linear.com.

Cheers,

Tom

Last edited by gootee; 10th February 2013 at 05:09 AM.
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Old 10th February 2013, 09:38 AM   #22
JMFahey is offline JMFahey  Argentina
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Old 12th February 2013, 04:54 PM   #23
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Question to you guru's if I may.
On the website of TI they show an SMD version of the LM3886, see pic.
But none of the usual suspects have them in their catalog.
Anyone seen one of those, or know where to get them?

tia, jan
Attached Images
File Type: jpg LM3886 smd.jpg (17.5 KB, 106 views)
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Old 12th February 2013, 05:19 PM   #24
JMFahey is offline JMFahey  Argentina
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Probably custom order by the 1000's for Manufacturers.
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Old 13th February 2013, 05:03 AM   #25
gootee is offline gootee  United States
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Originally Posted by jan.didden View Post
Question to you guru's if I may.
On the website of TI they show an SMD version of the LM3886, see pic.
But none of the usual suspects have them in their catalog.
Anyone seen one of those, or know where to get them?

tia, jan
If they don't offer samples, can you simply make some by bending the pins of a through-hole version into the correct positions? Or do you need some "real ones"?
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Old 13th February 2013, 05:43 AM   #26
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Datasheet only lists two types of package and neither is SMT, must be marketing vapourware or special order only.
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Old 13th February 2013, 07:10 AM   #27
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Yeah could be. I fired off an inquiry to TI.
Let's see what they say.
Maybe they are just testing the waters.

jan
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Old 14th February 2013, 01:05 PM   #28
JMFahey is offline JMFahey  Argentina
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