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[原创] Maxim MAX20090汽车高压高亮LED控制方案

关键词:电源管理 DC/DC转换器 LED控制器 MAX20090

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)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 range

MAX20090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 Voltage
ICTRL Pin for Analog Dimming
Integrated High-Side Current-Sense Amplifier
200Hz On-Board Ramp Simplifies PWM Dimming
Flexible Architecture Enables Easy Design OptimizationConfigurable as Boost, High-Side Buck, SEPIC, Buck-Boost, Zeta, and Cuk
Programmable Switching Frequency (200kHz to 2.2MHz)
Spread-Spectrum Modulation to Reduce EMI Noise
Automotive Features and Robustness Improve System ReliabilityFault Diagnosis Through Fault Flag
Short Circuit, Overvoltage, and Thermal Protection
-40°C to +125°C Operating Temperature Range

MAX20090应用:

Automotive Exterior Lighting
High-Beam/Low-Beam/Signal/Position Lights
Daytime Running Lights (DRLs)
Fog Lights and Adaptive Front-Light Assemblies
Head-Up Displays
Commercial, Industrial, and Architectural Lighting

图1.MAX20090功能框图

图2. MAX20090简化应用电路图

图3. MAX20090应用电路图

图4. MAX20090降压-升压LED驱动器

图5. MAX20090升压LED驱动器

图6. MAX20090高边降压LED驱动器

图7. MAX20090 SEPIC LED驱动器

图8. MAX20090降 Zeta转换器LED驱动器

图9. MAX20090Cuk转换器LED驱动器

评估板MAX20090 EVK

The MAX20090 evaluation kit (EV kit) provides a proven design to evaluate the MAX20090 automotive high-volt­age, high-brightness LED (HB LED) controller. The EV kit is set up for boost and buck-boost configurations and operates from a 6V to 18V DC supply voltage. The EV kit is configured to deliver up to 1A to one string of LEDs. The total voltage of the string can vary from 3V to 36V. The anode of the LED string should be connected to the LED+ terminal. The cathode of the LED string can be connected either to PGND (boost mode) or IN (buck-boost mode). In the case of boost mode, the input voltage should not exceed the LED string voltage.

The MAX20090 EV kit provides a proven design to evaluate the MAX20090 high-voltage HB LED driver with integrated high-side current sense. The EV kit is set up for boost and buck-boost configurations and operates from a 6V to 18V DC supply voltage. The EV kit is configured to deliver up to 1A to a series LED string. The string-forward voltage can vary from 3V to 36V.

评估板MAX20090 EVK主要特性:

Configured for a Boost and Buck-Boost Mode
Analog Dimming Control
Proven PCB Layout
Fully Assembled and Tested

图10.评估板MAX20090 EVK电路图
评估板MAX20090 EVK材料清单:


图11.评估板MAX20090 EVK PCB元件布局图

图12.评估板MAX20090 EVK PCB设计图(1)

图13.评估板MAX20090 EVK PCB设计图(2)
详情请见:
https://datasheets.maximintegrated.com/en/ds/MAX20090.pdf
https://datasheets.maximintegrated.com/en/ds/MAX20090EVKIT.pdf
MAX20090.pdf
MAX20090EVKIT.pdf

 

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