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1、Maxim MAX16826 高亮 LED (HBLED)驱动方案关键词：电源管理,LED驱动器,DC/DC转换器,HB LED他高亮度LED MAX16826 (HB LED)驱动器是专为汽车液晶显示器背光和其他 显示应用，如工业或桌面显示器和液晶电视。MAX16826集成开关稳压器控制 器，一个4通道的线性电流驱动，模数转换器(ADC)，和一个I2C接口。IC 设计承受汽车抛负载高达40V的瞬态和冷起动条件下运行。MAX16826包含一个电流模式PWM开关稳压控制器，调节输出电压的LED阵 列。开关稳压器部分配置为升压或SEPIC变换器及其开关频率可编程从100kHz 至 1MHz。MAX
2、16826包括4通道可编程，故障保护，恒流源驱动控制器能够驱动所有的 白色，RGB，RGB LED的配置或加琥珀。每个通道的发光二极管的发光控制是 由四个线性电流接收器中的每一个的直接调制信号来实现的。一个内部的ADC 测量外部驱动品体管的漏极电压和开关稳压器的输出。然后这些测量可通过I2C 接口外部微控制器(C)使输出电压优化LED的故障监测在每一个线性的LED currentsink通道电流和开关稳压器的输出电压的幅值是使 用I2C接口编程。附加的功能包括：逐周期电流限制，短路LED串的保护，超 温保护。MAX16826在热增强可用，5mm x 5mm，32引脚薄型QFN封装，是指定在汽
3、车40 C + 125 C温度范围。MAX16826主要特性：外部MOSFET允许范围广泛的LED每串LED电流多单个PWM调光输入每串非常宽的调光范围_ LED串短路和开路保护调节LED电流的上升/下降时间改善EMI控制单片机接口采用I2C允许发光二极管的电压监测和优化用一位内部ADC 短而开放的检测串电流和输出电压的动态调整待机模式集成升压/ SEPIC控制器外部开关频率同步_ 4.75V至24V工作电压范围和承受40V的甩负荷过压和过热保护MAX16826 应用：LCD背光：汽车信息娱乐显示器汽车集群显示器工业和台式电脑显示器液晶电视汽车照明：自适应前照灯低和高光束组件MLJT 螂DOm
4、- SUFFERED flEerSTER Ain DAGSZ-B-TiacAhD 5H0HIED STRNC FALJL1 HtTECTlOHL瞄 CDRaiHl- 5WK DR颂SaIElmsrarllmElWHHD周陷sc赠Mpelft袍 EG饵叮CURIW- 脚肝 GElEftATtfiRTCTR6:iniLEWM AMPLIFIED图2。MAX16826开关稳压器控制方框图-A/Vv 一 : 芝I-至王二一主昂占前项 LEO DRIUEH帅:m I hadIH.WP4KI图4。MAX16826典型应用电路图MAX16826评估板The MAX16826 evaluation kit (
5、EV kit) provides a proven design to evaluate the MAX16826, a four-string, I2C programmable high-brightness LED (HB LED) driver withPWM dimming control. The EV kit also includes Windows 2000/XP/Vista-compatible software that provides a simple graphical user interface (GUI) for exercising the features
6、 of the MAX16826. The MAX16826 EV kit PCB comes with a MAX16826ATJ+ installed. The EV kit is configured in a boost application.This EV kit can be modified by changing component values on the board for other configurations (including RGB LED applications). Refer to the MAX16826 IC data sheet for more
7、 information.MAX16826评估板主要特性：_ Four Independently Controllable LED Strings_ 7 LEDs Per String Configuration_ Independently Programmable 50mA to 150mA String Current_ 7.5V to 22V Input Voltage_ Can Withstand Automotive Load Dump Up to 40V for 400ms_ 0% to 100% DIM Duty Cycle Range_ Shorted LED Protec
8、tion and Detection_ Open LED String Detection_ Adaptive Boost-Stage Voltage Optimization_ Convenient Breakaway LED Driver Board Easily Adaptable to End Application_ Low Mechanical Profile_ Windows 2000/XP/Vista (32-Bit)-Compatible Software_ USB-PC Interface_ USB-to-I2C On-Board Circuitry_ Fully Asse
9、mbled and Tested_ Lead-Free and RoHS Compliant图5。MAX16826评估板LED驱动器电路图图6。MAX16826评估板控制器板电路图（1）th - UnTsoi ulnEMWS5?3H a=m3;J-.Z_.g=rs IcrsN EJMN rAWgB(SEJM&W illmlaeLL，PF3 匚O-FT-F心 O*- F-l o J *i-! Or-s CD*-m-+ D_H- z OU-pj-? i ZLLJLJL r?AnILlMCDJH i 洒叩I 心 srewi t的w%U1生 5 MGi!E/NJi HGi-S/J ? EWF4 毕 M
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