C2000 MCU的控制多个LED串的方法

　　C2000 MCU的控制多个LED串的方法

　　随着LED技术的不断发展，电源效率的提高和成本的节省使得LED的使用方式越来越多。同时，系统使用更多种类的LED，每种LED都需要不同的驱动，以达到最佳的性能、效率和颜色精度。汽车系统，例如，使用LED的各种功能，包括头灯，远光灯，雾灯，转弯灯等-每一个需要不同类型的LED和/或不同数量的LED。

　　开发人员可以使用不同的功率级拓扑和控制方法驱动多个LED字符串。每个拓扑和控制方法都有各自的优点，这取决于应用程序。两种常见的演示实现LED照明设计的实现，提供了两个LED照明开发套件基于实时控制C2000 Piccolo™建筑–DC/DC LED照明开发套件和多直流/直流彩色LED开发套件。结合TI公司的业界领先的开发软件和工具，工程师们可以使用这些工具包来加速各种照明应用的发展。

　　Power stage topologies and control methods

　　There are several common power stage design topologies and digital control methods used in the LED lighting industry. Each design implementation and control method offers its unique advantages and considerations. TI showcases two of these power stage design topologies and two accompanying control methods with its C2000 LED lighting developer’s kits.

　　Figure 1 shows the power topology for a single， shared power stage as used in the DC/DC LED Lighting Developer’s Kit. This topology utilizes a Piccolo F28035 MCU to control a single， flexible SEPIC DC/DC power stage and eight separate LED dimming stages for control of same type and same length LED strings. SEPIC is a dynamic topology which can run off a high voltage （up to 48 volts） and step up or step down the drive voltage appropriately. With this control topology， developers can precisely and independently control luminosity and color temperature of same-type/same-length LED strings. A single power stage topology is well-suited for applications such as industrial lighting where consistent output is required.