TI TLC6983超低功耗16 × 48 LED阵列驱动方案

TI公司的TLC6983是高度集成共阴的超低功耗16 × 48 LED阵列驱动器,具有16位PWM调光特性.单个TLC6983能驱动16x16 RGB LED像素,两个TLC6983堆栈能驱动32x32 RGB像素.为了得到低功耗,器件支持红绿蓝LED单独供电.单独VCC电压范围为2.5V-5.5V,而VR/G/B电压范围为2.5V-5.5V.器件的48个电流源通路从0.2 mA–20 mA,通路间精度典型为±0.5%,最大为±2%;器件间的精度为±0.5% (典型), ±2%(最大).当IOUT=5mA时拐点电压为0.26V,3比特(8步)全亮度控制,8比特(256步)色彩亮度控制.最大16比特(65536步)PWM灰度控制,16个扫描线开关190-mΩ RDS(ON).器件具有智能降功耗模式,单独VCC可低至2.5V.单个器件驱动多达16x48个LED或16x16 RGB LED,两个堆栈器件可驱动多达32 × 96 LED或32 × 32 RGB LED.器件具有LED开路,短路和弱短路检测和移除.主要用在LED数字标识,键盘和游戏附件,主要和智能家用电器,智能扬声器,有线和无线扬声器,音频混合器,DJ设备和广播以及接入设备,交换和服务器.本文介绍了TLC6983主要特性, 单个器件或两个器件堆栈连接图, LED开路和短路检测电路,以及评估板TLC6983 EVM硬件建立图,电路图,材料清单和PCB布局图.

Electronic devices are becoming smarter, requiringto use larger quantity of LEDs for animation andindication purposes and high performance LED matrixdriver is required to improve user experience withsmall solution size.

The LP5890 is a highly integrated common cathodematrix LED display driver with 48 constant currentsources and 16 scanning FETs. A single LP5890 iscapable of driving 16 × 16 RGB LED pixels whilestacking two LP5890s can drive 32 × 32 RGB LEDpixels. To achieve low power consumption, the devicesupports separated power supplies for the red, green,and blue LEDs by its common cathode structure.

Furthermore, the operation power of the LP5890 issignificantly reduced by ultra-low operation voltagerange (Vcc down to 2.5 V) and ultra-low operationcurrent (Icc down to 3.9 mA).

The LP5890 implements a high speed transmission interface to support high device count daisy-chained andhigh refresh rate while minimizing electrical-magnetic interference (EMI). The device supports up to 50-MHzSCLK and up t...