Intersil ISL97674六路45V双调光LED驱动方案

Intersil 公司的ISL97674是六路45V双调光LED驱动器,4.5V-26V时支持78个LED, 2.7V-26V时支持48个LED,可以采用SMBus/I2C 或PWM信号进行调光,输入电压4.5V-26.5V,最大输出电压45V,每路LED电流高达40mA,电流匹配±0.7%,主要用在笔记本电脑显示屏WLED或RGB LED背光,LCD监视器LED背光以及汽车显示器LED背光.本文介绍了ISL97674主要特性, 方框图, 典型应用框图以及ISL97671/2/3/4IRZ-EVAL评估板电路图和PCB布局图.

The ISL97674 is a 6-Channel 45V dual dimming capable LED driver that can be used with either SMBus/I2C or PWM signal for dimming control. The ISL97674 drives 6 channels of LED to support 78 LEDs from 4.5V to 26V or 48 LEDs from a boost supply of 2.7V to 26V and a separate 5V bias on the ISL97674 VIN pin.

The ISL97674 compensates for non-uniformity of the forward voltage drops in the LED strings with its 6 voltage controlled-current source channels. Its headroom control monitors the highest LED forward voltage string for output regulation, to minimize the voltage headroom and power loss in a typical multi string operation.
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