Maxim MAX16834高亮LED（HB LED）驱动方案

2009-07-15 14:14:00 Maxim

Maxim 公司MAX16834是高亮LED（HB LED）驱动方案，适用于升压，降压-升压，SEPIC和高边降压拓扑。MAX16834集成了实现固定频率宽范围调光控制的HB LED驱动器所需的所有区块。MAX16834的工作电压4.75V到28V，3000:1的PWM调光/模拟调光，100kHz到1MHz的可编程工作频率，集成了7V低压降稳压器，外接时钟同步输入。可用在单串LED LCD背景光，汽车电子前后照明，以及DC/DC升压/降压-升压转换器，点照明和环境光照明。本文介绍了MAX16834的主要特性，方框图以及升压LED 驱动器，降压-升压LED 驱动器，带汽车电子卸载保护的升压LED 驱动器，高边降压LED 驱动器，升压 DC-DC 转换器和降压-升压 DC-DC 转换器等电路图。

The MAX16834 is a current-mode high-brightness LED (HB LED) driver for boost, buck-boost, 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.
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