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Optoelectronics/Displays??

Powering and dimming high-brightness LEDs with the LM3405 constant-current buck regulator

Posted: 27 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:buck regulator? LED driver? power switch?

The LM3405 is a 1A, constant-current buck regulator designed to provide a simple, highly-efficient solution for powering LEDs with the highest power density. The low-feedback reference voltage of 205mV (typical) allows the use of LEDs with large forward voltages. The LM3405 LED driver comes with an integrated 1A high-side power switch, internal current limit, over-voltage protection and thermal shutdown. The LM3405 driver utilizes current mode control with internal compensation offering ease-of-use and predictable, high-performance regulation over a wide range of operating conditions.

This article describes a few of the many application solutions for the LM3405 LED driver. The LM3405 device is offered in a 6-pin TSOT package and operates at an internal switching frequency of 1.6MHz, allowing the use of small value inductors, thereby saving board space.

View the PDF document for more information.





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