LM2670 in digital power supply

reins · 23rd January 2006, 03:36 PM

Hi,

I ran into the simple witching regulator LM2670 in my CD players PS.

Has anyone experience if that regulator is bad in by any means?

here the link http://www.national.com/pf/LM/LM2670.html

Thanks
Stephan

N-Channel · 23rd January 2006, 04:09 PM

Hi Stephan,

The closest one to the '2670 I have worked with is the LM2677. Same as your 2670, but with a 5A rating. You might think of upgrading to the '2677 when replacing. What package is it? TO-220? Sutrface-mount? I have worked with the surface mount versions before without too much difficulty. You just need a steady hand with the soldering iron.

What was the failure mode of your '2670? Open? Short? Did it take any other components with it?

HTH,

Steve

reins · 23rd January 2006, 07:30 PM

Hi Steve,

what I haven't understood, is the output capacitor, in the spec are very specific selection criteria.
Makes it sense to choose a greater value there?

Stephan

23rd January 2006, 03:36 PM	#1
reins diyAudio Member Join Date: Mar 2004 Location: Bayern	LM2670 in digital power supply Hi, I ran into the simple witching regulator LM2670 in my CD players PS. Has anyone experience if that regulator is bad in by any means? here the link http://www.national.com/pf/LM/LM2670.html Thanks Stephan

23rd January 2006, 04:09 PM	#2
N-Channel diyAudio Member Join Date: Mar 2003 Location: Sol System	LM2670 Hi Stephan, The closest one to the '2670 I have worked with is the LM2677. Same as your 2670, but with a 5A rating. You might think of upgrading to the '2677 when replacing. What package is it? TO-220? Sutrface-mount? I have worked with the surface mount versions before without too much difficulty. You just need a steady hand with the soldering iron. What was the failure mode of your '2670? Open? Short? Did it take any other components with it? HTH, Steve

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