AN3981 Datasheet, PDF (1/54 Pages) STMicroelectronics – LED array drivers

AN3981
Application note
LED array drivers
Introduction
The use of LEDs in applications like displays, information and advertising panels, signs,
traffic signals, automotive lighting and architectural lighting is becoming more and more
common.
LED array drivers, with accurate constant current regulation and embedded serial
interfaces, offers a solution that is suitable for most of the above mentioned applications.
This document provides an overview of the STMicroelectronics portfolio of LED array
drivers.
According to the application, some specific features may be relevant:
■ Brightness adjustment through PWM dimming
■ Very high current accuracy
■ Diagnostic capability to detect faulty LEDs
■ Low power consumption
Moreover, the choice of the most appropriate product is driven also by the array length
(number of LED current generators), the LED current, type of LED (single color or RGB),
etc.
Figure 1. STMicroelectronics LED array drivers portfolio
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The wide variety of STMicroelectronics LED array drivers allows the selection of a dedicated
solution for a certain application. STMicroelectronics portfolio is summarized in Figure 1.
The following sections describe all the product family main features.
Furthermore, the document focuses on the guidelines that ease the use of these products in
the final application and also provides some particular application ideas.
January 2012
Doc ID 022217 Rev 1
1/54
www.st.com