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  1. 齐乐娱乐老虎机官网 >  解决方案 >  [齐乐娱乐老虎机官网] Maxim MAX25610A降压升压LED驱动器解决方案

[齐乐娱乐老虎机官网] Maxim MAX25610A降压升压LED驱动器解决方案

关键词:电源管理 DC/DC转换器 LED驱动器 MAX25610A 时间:2019-07-09 10:45:56       来源:齐乐娱乐老虎机官网

Maxim公司的MAX25610A/MAX25610B是全同步的LED驱动器,提供用来驱动大功率LED的恒流输出.器件集成两个60mΩ功率MOSFET,用来同步运行,以最少化外接元件.灵活的配置支持降压,反相降压-升压和升压转换.器件采用电流模式控制,具有快速瞬态响应和容易实现回路稳定.MAX25610A/MAX25610B包括逐个周期的限流,输出过压保护(OVP),LED串开路保护,输出短路保护(SCP)和热关断.器件还包括两个5V稳压器,支持外接电流检测,LED电流精度分别是±3%和±6%.MAX25610A/MAX25610B满足汽车规范AEC-Q100,输入电压从5V到36V,2.2MHz开关频率降低电感的尺寸.带模拟电压控制的PWM调光最少化调光外接元件.工作温度-40℃ 到+125℃,主要用在汽车照明和工业照明应用.本文介绍了MAX25610A/MAX25610B主要优势和特性,功能框图和多种应用电路图,以及评估板MAX25610 EVK主要优势和特性,电路图,材料清单和PCB设计图.

The MAX25610A/MAX25610B are fully synchronous LED drivers that provide constant output current to drive high-power LEDs. The MAX25610A/MAX25610B integrate two 60mΩ power MOSFETs for synchronous operation, minimizing external components. Flexible configuration supports buck, inverting buck-boost, and boost conversion. The devices incorporate current-mode control that provides fast transient response and eases loop stabilization. The MAX25610A/MAX25610B include cycle by cycle current limiting, output overvoltage protection (OVP), open-string protection, output short-circuit protection (SCP), and thermal shutdown.

In LED driver applications, the MAX25610A/MAX25610B provide analog dimming of the LED current through the REFI pin, and PWM dimming through the PWMDIM pin. Switching is enabled when PWMDIM is high, and disabled with both MOSFETs off when PWMDIM is low. Analog programming of the PWMDIM pin enables the built-in digital dimming function, with dimming frequency selected by the PWMFRQ pin.

The MAX25610A/MAX25610B include two 5V regulators. A regulated 5V between VCC and AGND is used for IC bias, REFI and PWMFRQ programming. Another low current regulated 5V between VEE and INN is used for analog PWMDIM and FLT pullup. Both PWMDIM and FLT reference INN for easy system interface. Switching frequency is internally set at 400kHz for the MAX25610A and 2.2MHz for the MAX25610B. The devices have built-in spread spectrum to reduce EMI noise. External and internal current sense are supported, with ±3% and ±6% respective LED current accuracy.

The MAX25610A/MAX25610B are well-suited for automotive applications requiring high voltage input and can withstand load dump events up to 40V. The devices can also be used as a DC-DC converter using the FB input as feedback for the output voltage divider. The MAX25610A/MAX25610B are available in thermally enhanced 16-pin TSSOP-EP and 16-pin TQFN packages. They are specified to operate over the -40℃ to +125℃ automotive temperature range.

MAX25610A/MAX25610B主要优势和特性:

Automotive Ready: AEC-Q100 Qualified
Integration Minimizes BOM to Save Space and Cost Wide input Voltage Range from 5V to 36V in Buck-Boost LED Driver Applications
2.2MHz Switching Frequency Option Reduces Inductor Size
Internal Current-Sense Option Reduces Cost
Integrated High and Low-Side Switching MOSFETs
PWM Dimming with an Analog Control Voltage Minimizes Additional Components for Dimming
Wide Dimming Ratio Allows High Contrast RatioAnalog and PWM Dimming
Multi-Topology Architecture Provides FlexibilityBuck LED Driver for 1-to-2 LEDs When Operating of Automotive Battery Applications
Inverting Buck-Boost LED Driver for 3-to-5 LEDs When Operating from Automotive Battery Applications
Protection Features and Wide Temperature Range Increase System Reliability -40℃ to +125℃ Operating Temperature Range
Short-Circuit, Overvoltage, and Thermal Protection
FLT Flag for Fault Indication

MAX25610A/MAX25610B应用:

Automotive Lighting Applications
Industrial Lighting Applications

图1.MAX25610A/MAX25610B功能框图

图2.MAX25610A简化应用电路

图3.MAX25610A降压LED驱动器电路

图4.MAX25610A/B精确电流稳流的降压LED驱动器电路

图5.MAX25610A/B降压DC/DC转换器电路

图6.MAX25610A降压升压LED驱动器电路

图7.MAX25610A带精确稳压的降压升压稳压器电路

图8.MAX25610A升压LED驱动器电路

评估板MAX25610 EVK

The MAX25610 evaluation kit (EV kit) provides a proven design to evaluate the MAX25610A automotive high-volt­age, high-brightness LED (HB LED) controller. The EV kit is set up for buck-boost configurations and operates from a 5V to 18V DC supply voltage. The EV kit is configured to deliver up to 1.1A to one string of LEDs. The total volt­age of the string can vary from 3V to 16V. The anode of the LED string should go to the LED+ terminal and the cathode should go to the LEDEXT- terminal.

评估板MAX25610 EVK主要优势和特性:

5V to 18V Input Voltage Range
Demonstrates Analog Dimming Control, Digital Dimming Control
Demonstrates External and Internal Current Sensing
Demonstrates LED Short and Open Protection
Proven PCB Layout
Fully Assembled and Tested

图9.评估板MAX25610 EVK电路图
评估板MAX25610 EVK材料清单:



图10.评估板MAX25610 EVK PCB设计图-元件放置图(顶层丝印)

图11.评估板MAX25610 EVK PCB设计图-顶层布局

图12.评估板MAX25610 EVK PCB设计图-层2布局

图13.评估板MAX25610 EVK PCB设计图-层3布局

图14.评估板MAX25610 EVK PCB设计图-底层布局

图15.评估板MAX25610 EVK PCB设计图-底层元件放置图(底层丝印)
详情请见:
https://datasheets.maximintegrated.com/en/ds/MAX25610A-MAX25610B.pdf
https://datasheets.maximintegrated.com/en/ds/MAX25610EVKIT.pdf
MAX25610A-MAX25610B.pdf
MAX25610EVKIT.pdf

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