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26th January 2006, 03:10 PM
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#1 |
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diyAudio Member
Join Date: May 2001
Location: London UK
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ALW Regulator Current Limit?
I have just tried a fully tested 12V unit to power a dac with a current requirement of 670mA but the unit just shuts down. I can find nonreference in the literature on current limit.
Am I overdrawing current? 
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26th January 2006, 08:06 PM
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#4 |
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diyAudio Member
Join Date: Mar 2003
Location: USA
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26th January 2006, 08:42 PM
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#5 | |
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Electrons are yellow and more is better!
diyAudio Member
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Re: ALW Regulator Current Limit?
Quote:
Do you have cooling, not  LM317 or D44H11?Max current can be calculated backwards. Hfe 25 min, typ 100 of the D44H11 Current through driver 1V/R1 => 10 mA That gives max current somewhere between 250-1000 mA but more like the higher value. The very current limit is set by the LM317, check datasheet for this (1-1.5 A)
__________________
/Per-Anders (my first name) or P-A as my friends call me |
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27th January 2006, 04:57 AM
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#6 |
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diyAudio Member
Join Date: May 2001
Location: London UK
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Re: Re: ALW Regulator Current Limit?
What is your input voltage?
------------------------------------------------------------------------------------15-17V ------------------------------------------------------------------------------------ Do you have cooling, not LM317 or D44H11? -YES------------------------------------------------------------------------------------ Max current can be calculated backwards. Hfe 25 min, typ 100 of the D44H11 Current through driver 1V/R1 => 10 mA That gives max current somewhere between 250-1000 mA but more like the higher value. ------------------------------------------------------------------------------------ These values are about right; so why does my regulator shut down at 600mA?
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27th January 2006, 06:09 AM
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#7 |
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Electrons are yellow and more is better!
diyAudio Member
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Notice at least 250 mA but how much load can it take then?
What does "shut down" mean? A bit voltage drop or what? Your input voltage with ripple taken into account, min voltage? It must be 15-16 V at least plus ripple.
__________________
/Per-Anders (my first name) or P-A as my friends call me |
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27th January 2006, 08:38 AM
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#8 | |
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diyAudio Member
Join Date: May 2001
Location: London UK
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Quote:
My apology; I treated a 15V regulator as though it was 12V; the thing never started even though the LED was on. Happilly now getting 650 mA on 12 V with 18V input. Now testing geat sink temperature. My rme dac sounds much better on ALW than LT1085 variable or manufacturer's 'good' switching supply. No hf fixx and more open!. |
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