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1、-Linear LT8500 48路LED PWM发生器解决方案关键词：电源管理,LED驱动器,PWM发生器,Linear 公司的LT8500是具有12位分辨率和解0MHz级联串口的48路LED PWM发生器,输入电压3V-5.5V,有48个单独的PWM输出,高达6.1kHz的PWM频率(PWMCK = 25MHz),主要用在大屏显示器LED背光,单色,多色和全色LED显示器,马大哈控制,工业控制,ATE和机器人.本文介绍了LT8500主要特性,方框图以及多种应用电路.48-Channel LED PWM Generator with 12-Bit Resolution and 50MHz C
2、ascadable Serial InterfaceThe LTR8500 is a pulse width modulation (PWM) generator with 48 independent channels. Each channel has an individually adjustable 12-bit (4096-step) PWM register and a 6-bit (64-step) 50% correction register. All controls are programmable via a simple serial data interface.
3、 Three banks of 16-channels each can be configured such that they operate 120 out-of-phase with each other.The LT8500 features two diagnostic information flags: synchronization error and open LED. The flags are sent, with additional state information, on the serial data interface during status read
4、back. The 50MHz cascadable serial data interface includes buffering and skew-balancing, making the chip suitable for PWM intensive applications such as large screen LCD dynamic backlighting and mono-,multi- and full-color LED displays. The LT8500 is also ideally suited to control three LT3595A LED d
5、rivers.LT8500主要特性:3V to 5.5V Input Voltage48 Independent PWM OutputsTTL/CMOS Logic 50MHz Serial Data Interface12-Bit (4096 Steps) PWM Width Resolution6-Bit (64 Steps) PWM Correction (50% of Programmed PWM Width)Up to 6.1kHz PWM Frequency (PWMCK = 25MHz)Phase-Shift Option Reduces Switching NoiseDirec
6、tly Controls Three LT3595A 16-Channel LED DriversDiagnostic Information: Sync Error/Open LED Flags56-Pin (5mm 9mm 0.75mm) QFN PackageLT8500应用:Large Screen Display LED BacklightingMono-, Multi-, Full-Color LED DisplaysLED Billboards and SignboardsMotor ControlIndustrial ControlAutomated Test EquipmentRobotics图1.LT8500方框图图2.LT8500串行接口拓扑图图3.LT8500采用5引脚拓扑驱动LT3595A的菊花链框图图4.LT8500采用4引脚拓扑驱动LT3595A的菊花链框图图5.单个LT8500驱动电阻镇流的48个LED串电路图图6.单个LT8500实现48个DAC通路图. z.
