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

图6.扩展板X-NUCLEO-LED61A1电路图(1)

图7.扩展板X-NUCLEO-LED61A1电路图(2)

图8.扩展板X-NUCLEO-LED61A1电路图(3)
扩展板X-NUCLEO-LED61A1材料清单(BOM):





图9.扩展板X-NUCLEO-LED61A1 PCB顶层布局图

图10.扩展板X-NUCLEO-LED61A1 PCB底层布局图
详情请见:
http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00134995.pdf
和http://www.st.com/st-web-ui/static/active/en/resource/technical/document/user_manual/DM00255021.pdf
以及http://www.st.com/st-web-ui/static/active/en/resource/technical/document/data_brief/DM00255169.pdf
DM00134995.pdf
DM00255021.pdf
DM00255169.pdf