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More  LEDWhite LEDDriver
 

White LED is Powered by One NiMH Cell


There are a lot of white LED driver circuits floating around.   A popular circuit called the “Joule Thief” can drive one white LED from a single 1.2v or 1.5v battery cell.  Most of these circuits use one or two transistors to form a voltage boost circuit.  Yes, they those circuit do drive a LED but they are not very efficient and they don’t do a good job of controlling the current to the LED.  The circuit below uses a tiny LT1932 IC made by Linear Technology.  This IC can be configured for a wide variety of LED driver needs.  I have shown one simple application.  The circuit takes power from one 1.2v NiMH rechargeable battery or a 1.5v disposable battery and drives a single white LED with 15ma of current.  With an efficiency of about 70%, the circuit should run for about 40 hours, if a quality 2500ma-hour battery is used.

Click on Drawing Below to view PDF version of Schematic

1 battery Cell LED Driver Circuit schematic

More  LED;  White LEDDriver

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