原标题：ST ALED6001汽车高亮度LED解决方案

　　ST公司的ALED6001是汽车级(AECQ100兼容)LED驱动器,集成了升压控制器和高边电流传感电路,用来优化驱动高亮度LED串,器件和多种拓扑如升压,SEPIC和浮动负载降压-升压.输入电压5.5 V - 36 V,输出电压高达60V,主要用在汽车外灯照明,白天运行照明,高低聚光灯,雾灯和方位灯/闪光信号灯.本文介绍了ALED6001主要特性,框图,几种应用电路以及安装在STM32 Nucleo板的LED驱动器扩展板X-NUCLEO-LED61A1主要特性,电路图,材料清单和PCB元件布局图.

　　The ALED6001 is an automotive-grade(AECQ100 compliant) LED driver that combines a boost controller and high-side current sensingcircuitry optimized for driving one string of highbrightnessLEDs. The device is compatible withmultiple topologies such as boost, SEPIC andfloating load buck-boost. PWM dimming of theLED brightness is achieved by means of anexternal MOSFET in series with the LED stringand directly driven by a dedicated pin. The pinthat manages the LED current setting, usuallyconnected to an external resistor, can also beused as analog control if a microcontroller islocated in the LED module.

　　The high-side current sensing, in combinationwith a P-channel MOSFET, provides effectiveprotection in case the positive terminal of the LEDstring is shorted to ground. The high precisioncurrent sensing circuitry allows an LED currentregulation reference within ± 4% accuracy overthe entire temperature range and productionspread.

　　A fault output (open-drain) informs the hostsystem of faulty conditions: deviceovertemperature, output overvoltage(disconnected LED string) and LED overcurrent.

　　ALED6001主要特性:

　　 Switching controller section

　　– 5.5 V to 36 V input voltage range

　　– Very low shutdown current: ISHDN <10 μA

　　– Internal +5 V LDO for gate driver supply

　　– Internal +3.3 V LDO for device supply

　　– Fixed frequency peak current mode control

　　– Adjustable (100 kHz to 1 MHz) switchingfrequency

　　– External synchronization for multi-deviceapplications

　　– High performance external MOSFET driver

　　– Cycle-by-cycle external MOSFET OCP

　　– Fixed internal soft-start

　　– Programmable output OVP

　　– Boost, buck-boost and SEPIC topologiessupported

　　– Thermal shutdown with autorestart

　　– Output short-circuit detection

　　 LED control section

　　– Up to 60 V output voltage

　　– Constant current control loop

　　– High-side output current sensing circuitry

　　– 30 to 300 mV differential sensing voltage

　　– ± 4% output current reference accuracy

　　– Output overcurrent protection

　　– Sensing resistor failure protection

　　– PWM dimming with auxiliary series switch

　　– Analog dimming

　　ALED6001应用:

　　 Automotive exterior lighting

　　 Daytime running lights

　　 High and low beam lights

　　 Fog lights

　　 Position lights / blinkers

　　图1. ALED6001框图

　　图2. ALED6001基本应用电路图(升压拓扑)

　　图3. ALED6001采用P沟MOSFET的高边调光控制电路图

　　采用LED6001的LED驱动扩展板X-NUCLEO-LED61A1

　　The X-NUCLEO-LED61A1 is an expansion board designed to provide sample compact LED driver applications using the LED6001.

　　X-NUCLEO-LED61A1 can be configured to operate LEDs through a boost converter or SEPIC converter and comes with a photo-transistor for ambient light sensing. The X-NUCLEO-LED61A1 is compatible with the ST morpho connector and supports the addition of other boards which can be stacked onto a single STM32 Nucleo board. The user can also mount the Arduino™ UNO R3 connector.

　　It is designed to provide sample solutions for several applications involving single LED strings (e.g., off-grid street lighting, advertisement boards, signs, gaming etc.)

　　图4.采用LED6001的LED驱动扩展板X-NUCLEO-LED61A1外形图

　　图5.安装在STM32 Nucleo板的扩展板X-NUCLEO-LED61A1

　　扩展板X-NUCLEO-LED61A1材料清单(BOM):