🚀 go-pugleaf

Good. I saw these type of matching at MAXIM.
IC MAX1910 / MAX1912

current regulator for white LED.



Johnny wrote:
> 
> On Sun, 06 Oct 2002 23:34:09 GMT, ehsjr@bellatlantic.net wrote:
> >
> >Johnny,
> >
> >The 317 in this configuration serves no useful purpose.
> >Limiting current to the 9 strings in parallel does not
> >limit the current to individual strings. One string can
> >"hog" as much as it is capable of, up to the limit established
> >by the LM317. You're looking to keep the current through
> >each LED to 25 ma - your circuit won't do that.
> 
> Here is *yet* another circuit that provides better regulation for all
> series strings.  Each additional string will mirror the same current
> that is passing though the first series string, although the regulator
> only monitors the first string.
> 
> (+12~13.8V)----[ LM317T ]---------------------------- (output pin)
>                         [               ]   >                     <
> 
>                                 |           <  36R             >  36R
>                                 |           <                     >
>                                 |           >                     <
> 
>                                 -------------                       |
> 
>                                             |                       |
> 
>                                         [LED]               [LED]
>                                         [LED]               [LED]
>                                         [LED]               [LED]
>                                         [LED]               [LED]
>                                             |                       |
> GND------------------------------------------------------------
> 
> regards,
> Johnny.