IntersilISL97691單顆鋰電池4路LED驅動方案

LED驅動器,可用于需要模擬調光的手機顯示器和3D顯示屏.輸入電壓2.4V-5.5V,提供4路40mA電流和高達26V電壓,電流匹配±2.5% ,具有故障保護,主要用在平板電腦,筆記本PC和智能手機顯示器LED背光,移動顯示器2D或3D LED背光.本文介紹了ISL97691主要特性,方框圖,典型應用電路圖,PCB布局參考圖和故障保護電路圖.

ISL97691主要特性:

• Operating Input Voltage 2.4V to 5.5V - No Need for Additional Supplies

• 4 x 60mA (Note 1) and 4 x 40mA (Note 2) LED Current

• 2 Groups of Independent Analog and PWM Current Controls

- 1-Wire Interfaces for 6-bit Analog Dimming

- PWM Inputs for PWM Dimming

- 0.005% Minimum PWM Dimming Duty Cycle at 100Hz

• Low 1mA Operating Current

• ±2.5% Current Matching

• Adjustable Switching Frequency from 400kHz to 1.5MHz

• Fault Protection

- OVP, OTP, Channel Open/Short Circuit Protections

ISL97691應用:

• Tablet, Notebook PC and Smart Phone Displays LED Backlighting

• Mobile Displays for 2D or 3D LED Backlighting

圖2.ISL97691典型應用電路圖