Circuits & Schematics - Light - 5

Controlling the brightness of LEDs requires a driver that provides a constant, regulated current. To achieve this goal, the driver topology must be able to generate a large enough output voltage to forward bias the LEDs. So, what are your choices ...

Ajmal Godil Electronic Design Consumer-based LED applications have really taken off. You now find them in home lighting, airplane cabin lights, automobile lights, MP3 players, and elsewhere. In the past, most LED drivers were based on some sort of ...

A solar day lamp is a simple, inexpensive device for bringing “daylight” to dark interior spaces whenever the sun is shining. This article provides complete instructions for designing lamps using both passive and active current limiting ...

Grant Smith EDN Powering 20 to 30 white LEDs from three alkaline cells presents an interesting problem for the conventional boost converter. The required boost ratio and duty factor are simply impractical. If you are determined to design with ...

Kyle Lawrence, Analog Devices Design Note 570 Introduction The LED backlights in automotive heads-up displays, infotainment systems, and dashboard lighting must be bright enough to compete with direct sunlight streaming into a car during the day, ...

Using LEDs has gained popularity as a method of saving power for general-purpose lighting, but an efficient method for driving them has also become a necessity. For example, Lumileds' Luxeon devices create lighting effects or room lighting. ...

This flasher/beacon circuit can be employed as a distress signal on highways, a direction pointer for parking lots, hospitals, and hotels, etc. The circuit uses a power LED, and provides more light than a typical incandescent lamp flasher. Use of a ...

Dan Awtrey Electronic Design By pairing a visible-light LED (VLED) with a depletion-mode MOSFET, you can create an efficient, controllable current-source driver. High-brightness visible-light LEDs (VLEDs) require a constant-current source. This ...

Neda Shahi EDN Recent advances in operating efficiency have expanded the use of LEDs from one of mere indicators to becoming driving forces in electronic lighting. Increased reliability and ruggedness (versus other lighting technologies) gives the ...

The human eye can see any color as a mixture of blue, red, and green. The circuit in Figure 1 produces all three colors through an Broadcom ASMT-YTB0 tricolor LED. You can produce a wide range of colors by varying the current in the blue, red, and ...