MAX16814主要特性:

4-Channel Linear LED Current Sinks with Internal MOSFETs Full-Scale LED Current Adjustable from 20mA to 150mA Drives One to Four LED Strings Boost, SEPIC, or Coupled-Inductor Boost-Buck Current-Mode DC-DC Controller 200kHz to 2MHz Programmable Switching Frequency External Switching Frequency Synchronization
Adaptive Output-Voltage Optimization to Minimize Power Dissipation

4.75V to 40V Operating Input Voltage Range

Less than 40μA Shutdown Current

5000:1 PWM Dimming at 200Hz (MAX16814A _ _ and MAX16814U_ _ Only)

Open-Drain Fault Indicator Output

Open-LED and LED Short Detection and Protection

Overtemperature Protection

Thermally Enhanced, 20-Pin TQFN and TSSOP Packages

MAX16814应用: 

Automotive Displays LED Backlights

Automotive RCL, DRL, Front Position, and Fog Lights

LCD TV and Desktop Display LED Backlights

Architectural, Industrial, and Ambient Lighting


图.MAX16814 简化功能框图

图.MAX16814典型应用电路图

图.MAX16814 SEPIC配置图

图.MAX16814电感耦合升压-降压配置图

MAX16814 评估板

The MAX16814 evaluation kit (EV kit) demonstrates the MAX16814 high-brightness LED (HB LED) driver, integrating a step-up DC-DC preregulator followed by 4 channels of linear current sinks. The step-up preregulator switches at 350kHz and operates as a current-modecontrolled regulator capable of providing up to 600mA for the linear circuits. Each of the 4 linear channels can operate up to 40V and provide up to 150mA per channel. The 4 channels are configurable for 100mA or 150mA HB LED output current. The IC is a 20-pin TSSOP package with an exposed pad for enhanced thermal power dissipation.

The EV kit operates from a DC supply voltage of 6.5V up to the HB LED string forward voltage. The EV kit can withstand a 40V load-dump condition. The EV kit also demonstrates the IC features such as adaptive voltage optimization, undervoltage lockout (UVLO), overvoltage protection (OVP), cycle-by-cycle current limit, thermal shutdown, and digital PWM dimming operation using a digital PWM input signal to control the brightness of the HB LEDs. The EV kit also demonstrates a reference IC design for automotive applications.

MAX16814 评估板主要特性:

Input Voltage from 6.5V Up to HB LED Forward Voltage

Demonstrates OVP (33V)

HB LED String Output Currents Configurable for 100mA or 150mA

Demonstrates UVLO (5V)

Demonstrates Open and Short LED Fault Protection and Detection

Demonstrates Cycle-by-Cycle Current Limit and Thermal-Shutdown Features

Demonstrates Adaptive Voltage Optimization

Proven PCB and Thermal Design

Fully Assembled and Tested

图.MAX16814 评估板电路图
MAX16814 评估板材料清单:




图.MAX16814 评估板元件布局图

图.MAX16814 评估板PCB布局图
Maxim 公司的MAX16814是集成了高压DC/DC控制器的四路高亮LED(HBLED)驱动器,输入电压4.75V-40V,能经受住汽车负载突变,可调输出电流从20mA到150mA,以驱动一到四串LED,开关频率200kHz到2MHz,自适应输出电压以最小化功耗,关断电流小于40uA,主要用在汽车显示屏LED背光,汽车RCL,DRL,前灯和雾灯,建筑物,工业和环境灯照明.重点介绍了MAX16814主要特性,功能框图,典型应用电路以及MAX16814 评估板主要特性,电路图,材料清单和PCB布局图.

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