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White LED (White Light Emitting Diodes) Circuits
White LEDs:  #-B     C - K      L - P      Q - V     W - Z       LED Circuits  
Last Updated on: Wednesday, November 29, 2017 05:40 AM

 

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

White LED drive from 1.5V -  How do you get 3.5 volts to drive a white LED when you only have a 1.5v battery?.....(schematic / circuit added 6/07)
White LED driver backlights LCD and keypad -  13-Nov-03 Issue of EDN  Designers widely use white LEDs to backlight color LCDs and keypads in handheld devices, such as cell phones, MP3 players, GPS navigators, and PDAs. Their spectrum and brightness represent near-ideal light sources. One possible configuration for a phone or a phone/PDA combination is to have a group of three LEDs to light the display and six LEDs for the keypad..... [Design Idea by Fabien Franc, Catalyst Semiconductor, Sunnyvale, CA]
White LED Driver in Tiny SC70 Package Achieves 84% Efficiency -  Linear Technology Magazine Design Ideas August 2002 (app note added 2/05)
White LED Driver Minimizes Space Maximizes Efficiency & Flexibility -  Linear Technology Magazine Design Feature December 2003.....[App Note]
White LED driver operates down to 1.2V supply voltage -  3-Sep-07 Issue of EDNThis circuit beats commercially available LED drivers, which bottom out at 2.5V input voltage, by operating at voltages as low as 1V..... [Design Idea by Dave Wuchinich, Modal Mechanics, Yonkers, NY]
White LED driver provides 64 step logarithmic dimming -  10-Jun-04 Issue of EDN  The circuit of Figure 1 is designed for portable-power applications that require white LEDs with adjustable, logarithmic dimming levels. The circuit drives as many as four white LEDs from a 3.3V source and adjusts the total LED current from 1 to 106 mA in 64 steps of 1 dB each. The driver is a charge pump that mirrors the current ISET (sourced from IC3's SET terminal] to produce a current o..... [Design Idea by William Hadden, Maxim Integrated Products, Sunnyvale, CA]
White LED driver touts high efficiency -  12-Jun-03 Issue of EDN  White LEDs, the most recent addition to the LCD backlight, find common use in providing backlight for color LCDs. Thanks to their size and white-light output, they appear in small, portable devices with color displays, such as PDAs and cellular phones. Like other LEDs, a white LED needs a constant-current source—typically, on the order of 15 to 20 mA..... [Design Idea by Dimitry Goder, Sipex Corp, San Jose, CA]
White LED Head Lamp -  A white LED head lamp which can operate with only two AA batteries. The LEDs are driven in constant current, so that the brightness is maintained until end of battery life.  (added 10/05)
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