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基于MAX17127设计的高效白光LED驱动技术

发布时间:2020-07-21 18:20:47 阅读: 来源:不锈钢酒桶厂家

MAX17127是Maxim公司的高效白光LED(WLED)驱动器,它的内部开关电流模式升压转换器能驱动LED阵列,多达并联6串LED,每串13个LED.每串电流匹配达到±2%,输入电压5V-26V,可调电流从10mA到30mA. 可调开关频率从250kHz 到1MHz.主要用在汽车电子系统,手持终端以及笔杆子电脑和便携式计算机显示器.本文介绍了MAX17127主要特性,功能方框图,以及典型应用电路.The MAX17127 is a high-efficiency driver for white light-emitting diodes (LEDs). It is designed for large liquid-crystal displays (LCDs) that employ an array of LEDs as the light source. An internal switch current-mode step-up converter drives the LED array, which can be configured for up to six strings in parallel and 13 LEDs per string. Each string is terminated with ballast that achieves ±2% current-regulation accuracy, ensuring even LED brightness. The MAX17127 has a wide input-voltage range from 5V to 26V, and provides an adjustable 10mA to 30mA full-scale LED e MAX17127 can implement brightness control through the PWM signal input, and LED current is directly controlled by the external dimming signal’s frequency and duty e MAX17127 has multiple features to protect the controller from fault conditions. Once an open/short string is detected, the fault string is disabled while other strings can still operate normally. The controller features cycle-by-cycle current limit to provide constant operation and soft-start capability. If the MAX17127 is in current-limit condition, the step-up converter is latched off after an internal timer expires. A thermal-shutdown circuit provides another level of protection. When thermal shutdown happens, the MAX17127 is latched e MAX17127’s step-up controller features an internal 0.12Ω (typ), 48V (max) power MOSFET with local current-sense amplifier for accurate cycle-by-cycle current limit. This architecture greatly simplifies the external circuitry and saves PCB space. Low-feedback voltage at each LED string helps reduce power loss and improve efficiency. The MAX17127 features resistor-adjustable switching frequency from 250kHz to 1MHz, which enables a wide variety of applications that can trade off component size for operating e MAX17127 is available in a thermally enhanced, lead-free, 20-pin, 4mm x 4mm thin QFN X17127主要特性:5V to 26V Input Supply Voltage Up to Six Parallel Strings Multiple Series-Connected LEDs 250kHz to 1MHz Adjustable Switching Frequency 0.12Ω Internal HV Power MOSFET (48V max) Low String Feedback Voltage: 480mV at 20mA LED Current Full-Scale LED Current Adjustable from 10mA to 30mA ±2% Current-Regulation Accuracy Between Strings 400ns Minimum String On-Time 100Hz to 25kHz PWM Input Range Open and Short LED Protection Output Overvoltage Protection Thermal Shutdown Small 20-Pin, 4mm x 4mm Thin QFN Package MAX17127应用:Automotive SystemsHandy TerminalsNotebook, Subnotebook, and Tablet Computer Displays图X17127功能方框图

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