TI用于笔记本电脑的白光LED驱动器解决方案

发布时间：2012-10-17 阅读量：1077 来源: 我爱方案网作者:

导读：TI（德州仪器）的TPS61187芯片提供应用于笔记本电脑LCD背光的高集成白光LED解决方案，此驱动器具有具有PWM接口和自动相移功能，这个器件内嵌一个高效升压校准器，而且集成一个2.0A /40V的MOSFET。

TPS61187有六个渗入电流调节器提供高精度电流校正和匹配。这个器件可以给60个白光LED供电。另外，降压输出自动的调整它的电压与WLED的正向电压相符，并且可以优化效率。TPS61187支持自动相移调光和直接PWM调光。

The TPS61187 supports the auto phase shift Programmable Mode During phase shift PWM dimming, the WLED current is turned on/off at the duty cycle controlled by the input PWM signal and each channel is shifted according to the frequency determined by an integrated pulse width modulation (PWM) signal. The frequency of this signal is resistor programmable,while the duty cycle is controlled directly from an external PWM signal input to the PWM pin. During direct PWM dimming, the WLED current is turnedon/off synchronized with the input PWM sigal