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随动转向大灯侧向辅助灯解析

发布时间:2020-06-30 20:56:12 阅读: 来源:颇尔滤芯厂家

MAX16834是电流模式大功率高亮度LED(HB LED)驱动器,可组成升压,升-降压,SEPIC和高边降压拓扑.除了用开关PWM控制器驱动N沟功率MOSFET外,还能驱动N沟PWM调光开关. MAX16834输入电压从4.75V 到28V,3000:1 PWM调光/模拟调光,工作频率从100kHz 到1MHz可编程,主要用在单串LED LCD背光,汽车前后照明,精密系统RGB LED光源,DC/DC升压/升-降压转换器等.本文介绍MAX16834主要特性,方框图,多种应用电路以及MAX16834评估板主要特性,电路图,材料清单和PCB元件布局图.The MAX16834 is a current-mode high-brightness LED (HB LED) driver for boost, boost-buck, SEPIC, and highside buck topologies. In addition to driving an n-channel power MOSFET switch controlled by the switching controller, it also drives an n-channel PWM dimming switch to achieve LED PWM dimming. The MAX16834 integrates all the building blocks necessary to implement a fixed-frequency HB LED driver with wide-range dimming e MAX16834 features constant-frequency peak current-mode control with programmable slope compensation to control the duty cycle of the PWM controller.A dimming driver designed to drive an external n-channel MOSFET in series with the LED string provides wide-range dimming control up to 20kHz. In addition to PWM dimming, the MAX16834 provides analog dimming using a DC input at REFI. The programmable switching frequency (100kHz to 1MHz) allows design optimization for efficiency and board space reduction. A single resistor from RT/SYNC to ground sets the switching frequency from 100kHz to 1MHz while an external clock signal at RT/SYNC disables the internal oscillator and allows the MAX16834 to synchronize to an external clock. The MAX16834’s integrated highside current-sense amplifier eliminates the need for a separate high-side LED current-sense amplifier in boost-buck e MAX16834 operates over a wide supply range of 4.75V to 28V and includes a 3A sink/source gate driver for driving a power MOSFET in high-power LED driver applications. It can also operate at input voltages greater than 28V in boost configuration with an external voltage clamp. The MAX16834 is also suitable for DCDC converter applications such as boost or ditional features include external enable/ disable input, an on-chip oscillator, fault indicator output (FLT) for LED open/short or overtemperature conditions, and an overvoltage protection sense input (OVP+) for true overvoltage e MAX16834 is available in a thermally enhanced 4mm x 4mm, 20-pin TQFN-EP package and in a thermally enhanced 20-pin TSSOP-EP package and is specified over the automotive -40℃ to +125℃ temperature X16834主要特性:_ Wide Input Operating Voltage Range (4.75V to 28V)_ Works for Input Voltage > 28V with External Voltage Clamp on VIN for Boost Converter_ 3000:1 PWM Dimming/Analog Dimming_ Integrated PWM Dimming MOSFET Driver_ Integrated High-Side Current-Sense Amplifier for LED Current Sense in Boost-Buck Converter_ 100kHz to 1MHz Programmable High-Frequency Operation_ External Clock Synchronization Input_ Programmable UVLO_ Internal 7V Low-Dropout Regulator_ Fault Output (FLT) for Overvoltage, Overcurrent, and Thermal Warning Faults_ Programmable True Differential Overvoltage Protection_ 20-Pin TQFN-EP and TSSOP-EP PackagesMAX16834应用:Single-String LED LCD BacklightingAutomotive Rear and Front LightingProjection System RGB LED Light SourcesArchitectural and Decorative Lighting (MR16, M111)Spot and Ambient LightsDC-DC Boost/Boost-Buck Converters图X16834方框图图X16834升压LED驱动器图X16834升压-降压LED驱动器(VLED+ 28V)图X16834带汽车电子负载突变保护的升压LED驱动器图X16834高边降压LED驱动器

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