Maxim MAX17127高效白光LED驱动方案
Maxim公司的MAX17127是高效白光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 current.
The 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 cycle.
..
