Maxim-MAX20090汽车高压高亮LED控制方案.docxVIP

Maxim MAX20090汽车高压高亮LED控制方案 时间：2017-07-06 09:10:24?????? 作者：Maxim?????? 来源：中电网 Maxim公司的MAX20090是汽车用单路高亮LED(HB LED) HYPERLINK /topic/tag_list.html?id=96017 \t _blank 控制器,输入电压从5V到65V,最大输出电压65V,可编程开关频率200kHz到2.2MHz,可配置成升压,高边降压,SEPIC,降压-升压,Zeta和Cuk架构,具有短路,过压和热保护特性,工作温度-40°C到+125°C,主要用在汽车外部照明,远光灯/近光灯/信号灯/位置灯,白天运营照明(DRL)以及雾灯和自适应前灯等.本文介绍了MAX20090主要优势和特性,功能框图,多种应用电路以及评估板MAX20090 EVK主要特性,电路图,材料清单和PCB设计图.The MAX20090 is a single-channel high-brightness LED (HB LED) driver for automotive front-light applications such as high beam, low beam, daytime running lights (DRLs), turn indicators, fog lights, and other LED lights. It can take an input voltage from 5V to 65V and drive a string of LEDs with a maximum output voltage of 65V.The device senses output current at the high side of the LED string. High-side current sensing is required to protect for shorts from the output to the ground or battery input. It is also the most flexible scheme for driving LEDs, allowing boost, high-side buck, SEPIC mode, or buck-boost-mode configurations. The PWM input provides LED dimming ratios of up to 1000:1, and the ICTRL input provides additional analog dimming capability in the controller. The device also includes a fault flag (FLT) that indicates open string, shorted string, and thermal shutdown. The device has built-in spread-spectrum modulation for improved electromagnetic-compatibility performance. The device can also be used in zeta and Cuk converter configurations, if necessary in some applications. The MAX20090 is available in a space-saving (4mm x 4mm), 20-pin TQFN, 20-pin side-wettable TQFN, or a 20-pin TSSOP package and is specified to operate over the -40℃ to +125℃ automotive temperature rangeMAX20090主要优势和特性:High-Brightness LED Driver with a Wide Input Range Saves Space and Cost Through Integration+5V to +65V Wide Input Voltage Range+65V Maximum Boost Output VoltageICTRL Pin for Analog DimmingIntegrated High-Side Current-Sense Amp HYPERLINK /topic/tag_list.html?id=2