营销基金产品过程中的体会

maxim 公司的max16834是集成了高边led电流检测和pwm调光mosfet驱动器的大功率led驱动器。这种恒流模式高亮度led（hbled）驱动器适合于升压，升-降压，sepic和高边降压拓扑。

工作电压从.4.75v到28v，pwm调光/模拟调光比3000：1，可编程工作频率100khz到1mhz，主要应用在单串led lcd背光，汽车前后灯照明，投映rgb led光源，环境照明和dc-dc升压/降压－升压转换器。本文介绍了max16834主要特性，方框图以及多种应用电路。

high-power led driver with integrated high-side led current sense and pwm dimming mosfet driverthe 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 control.the 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 applications.the 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