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     1. 01:49 AM - Designing a LED lighting with LM317 (figout)
 
 
 

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Time: 
01:49:31 AM PST US
Subject: 
Designing a LED lighting with LM317
From: 
"figout" <queezelee@yahoo.com>
      
      
      Hi guys!
      
      I'm designing a LED lighting with LM317 (http://www.kynix.com/Detail/799868/LM317.html),and I have a problem trying to adjust the LM317 voltage with a digital pot (MCP41050, 50K).
      
       I have placed the pot in parallel with a 3,3K(R2) resistor and this makes me adjust
      the resistance from 3095ohm to about 270ohm+- (measured).
      
      The R1 resistor is 220 ohm. After what i have calculated, this will give me a range
      from bout 20V to 2.80V.
      
      The problem is that I'm just able to adjust it from 2.80V to bout 7.00V.
      
      Can anyone give me some pointers on what I'm doing wrong here?
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=467093#467093
      
      








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