Microcontroller-based LED drivers: topologies and trade-offs
Drivers based around microcontrollers can be simple to design and offer a number of advantages for controlling high-intensity LEDs. However, some limitations remain, as Pedro Pachuca and Rod Borras of Freescale Semiconductor discuss.
A number of different topologies can be achieved with a microcontroller at the heart of an LED driver system. In this article, the topology trade-offs are discussed in detail, with an emphasis on the major features and limitations: communication, voltage and current capabilities, dimming techniques and switching speed.
Driving high-intensity LEDs
High-intensity LEDs (HI-LEDs) are different from standard LEDs based on their power input: traditional LEDs are generally limited to less than 50 mW, while HI-LEDs operate at 1-5 W.
To read the rest of this article, please register for a free subscription to LEDs Magazine Review.
Existing subscribers:Click here to enter your reader number and download the new issue.