Circuits & Schematics - Light - 10

Yan-Niu Ren, Southwest Petroleum University, Chengdu, China A constant current is better than a constant voltage for driving LEDs. In this proposed circuit, a common constant-voltage regulator is changed into a constant-current source for LEDs. In ...

James Campbell Electronic Design This relatively simple circuit uses a 6-V DC supply with a PWM current-source configuration to provide efficient, adjustable dimming of a white LED over a wide range, needed to accommodate the unique lighting needs ...

Hua (Walker) Bai, Linear Technology Design Note 508 Introduction The meaning of the term high power LED is rapidly evolving. Although a 350 mA LED could easily earn the stamp of high power a few years ago, it could not hold a candle to the 20 A LED ...

Application Note AN-1188 August 2013 Akos Hodany The IRuFB1 40 W Isolated Flyback PFC design is presented in this document. This power supply circuit provides power factor correction (PFC), output voltage regulation and full protection against ...

This project is pretty cool for a few reasons, and driving a huge LED matrix with a single 8-bit controller is just one of them. The idea was born when I bought 120 LEDs of the wrong type, and decided to do something with them. With that many LEDs, ...

Subodh Johri and Prateek Johri, India EDN The H-bridge is a classic circuit used for driving dc motors in a user-defined manner, such as in forward/reverse direction or PWM-assisted controlled RPM with the help of four discrete/integrated switches ...

Application Note JN-AN-1166 Version 1.1 December 2013 This application note provides and describes a set of NXP software drivers for use with ‘smart lamps’. These software drivers are intended to be used in applications that run on ...

Tai-Shan Liao, National Applied Research Laboratories, Instrument Technology Research Center, Hsinchu, Taiwan EDN An excessive level of light from a laser pointer, even if only for a short duration, can be harmful if it enters the human eye either ...

Design Note DN05034/D November 2013 The NCL30051LEDGEVB LED driver evaluation board provides PWM dimming capability via gating the resonant half bridge converter on and off at the PWM rate. Effective minimum duty factor is about 10% being limited ...

Design Note DN05055/D October 2013 High voltage LEDs are becoming more popular and are now available from multiple LED manufacturers such as CREE and Philips-Lumileds. These package LEDs may have typical forward voltages ranging from 24 to 200 V. ...