IntersilISL97691单颗锂电池4路LED驱动方案

LED驱动器,可用于需要模拟调光的手机显示器和3D显示屏.输入电压2.4V-5.5V,提供4路40mA电流和高达26V电压,电流匹配±2.5% ,具有故障保护,主要用在平板电脑,笔记本PC和智能手机显示器LED背光,移动显示器2D或3DLED背光.本文介绍了ISL97691主要特性,方框图,典型应用电路图,PCB布局参考图和故障保护电路图.

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应用:

• Tablet, Notebook PC and Smart Phone Displays LED Backlighting

• Mobile Displays for 2D or 3D LED Backlighting

图2.ISL97691典型应用电路图