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  • LED s Shine On
    into such critical safety-lighting applications as traffic signals and airport-runway lighting. One result: Concerns about quality and reliability now extend even to the least-expensive LEDs. A problem for design engineers is that LEDs are fragile solid-state devices susceptible to damage
  • MEMS sensors play role in LED lighting revolution
    LED lighting system costs can be reduced with good control circuit design and component selection.
  • A Digital Constant Current Power LED Driver
    AN1138 A Digital Constant Current Power LED Driver drive current for this type of LED would be 350 mA and Author: Stephen Bowling a typical forward voltage would be 3.5V. Secondly, we Microchip Technology Inc. will assume that the circuit input voltage is 12V. The inductor value will be chosen
  • Buck Configuration High-Power LED Driver
    The circuit and firmware described in this application note demonstrates a minimal parts count driver/controller for a high-power (1W or greater) LED. The circuit is based on a buck topology switching power supply using the on-chip comparator peripheral within the PIC12F675 PIC (R) microcontroller
  • Buck-Boost LED Driver Using the PIC16F785 MCU
    This application note presents the design equations, schematics and source code for a 5.5W power LED driver using the PIC16F785 MCU. The application, as shown, can be connected to operate as a buck-boost converter or a boost converter. The PIC16F785 makes a great choice for this application because
  • Circut Ideas: LED driver lights three LED strings and provides constant voltage supply
    are designed to light multiple strings of LEDs. For instance, Linear Technology 's LT3476 can drive four LED strings, totaling 100 W. The chip is basically a constant-frequency, currentmode regulator. In applications where there are leftover driver channels, the extra channels can be applied to the task
  • A Clock Design Using the PIC16C54 for LED Displays and Switch Inputs
    The purpose of this application note is to design a clock while multiplexing the features as much as possible, allowing the circuit to use the 18-pin PIC16C54. Other devices in the Microchip line expand on this part, making it a good starting point for learning the basics. This design is useful
  • Switch Tips: Electro-Optic Level Switches
    Electro-optic level switches are used to signal the presence or absence of a liquid. They contain an infrared light-emitting diode (LED) and a light receiver. Light from the LED reflects from a prism forming the tip of the device back into the light detector. With no liquid present, most LED light

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