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The attached diagram is a cct that I have used for many "Constant LED 
Current" applications with Vin from 5V to 24V. Your mileage may vary.

Antonio Benci

Rolf wrote:
> Hi Forrest,
> 
> How about a current limiting circuit (borrowed from 'the art of 
> electronics') which I am still reading....
> 
> It seems like it will do what you want, but, instead of a Zener and PNP, 
> it is a PNP and a PMOSFET. May not help with the part count.
> 
> Still, I have re-drawn the schematic and it should supply 7mA to the LED 
> at any line voltage the PMOS can handle....
> 
> Basically, the 100R resistor, with the 0.7Vbe voltage on the PNP will 
> set a current limit of 7mA.
> 
> Any variances in the current will be due to the Vbe changes over temp. 
> Using a MPSA92 as a 'typical' PNP transistor it gives a range of 0.5V 
> through 0.8V for Vbe over -55 to 125 degrees, which would correlate to 5 
> through 8mA through the LED over the entire temp range.
> 
> Obviously, there is probably something I have missed, but, I would love 
> to know what because it would be a good learning exercise for me....
> 
> Rolf
> 
> 
> 
> Forrest W Christian wrote:
>> I seem to quite often need to run a "voltage present" LED on a very 
>> wide range of voltages...  For instance, in one case the input voltage 
>> can run from 5 to 60VDC, or more.
>>
>> I need to power this LED from the power source, but need to regulate 
>> the current so that the LED is pretty much constant output across the 
>> voltage range.
>>
>> I'm aware of the standard schematic using a PNP, a Zener, and a couple 
>> of resistors, but would prefer something with lower part count.
>>
>> I'm also aware of the LM317HV, but the cost there is prohibitive (I 
>> would need the HV becuase of the higher voltage range input).
>>
>> Of course there's always the option of putting a regular voltage 
>> regulator and resistor in, but again, that gets somewhat costly.
>>
>> I'm hoping I can find something just marginally more expensive than 
>> putting a current limiting resistor in place.   Is there some magic 
>> circuit I've missed...
>>
>> -forrest
>>   
> 
> 
> ------------------------------------------------------------------------
> 


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adr:;;PO Box 27;Monash University;VIC;3800;Australia
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title:Professional Officer / E&IS Manager
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