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3D LED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
![](../img/eep-analog/analog-24242osxsqwpifkq.jpg)
![](../img/eep-analog/analog-242434azyrmrycz1.jpg)
图2.ISL97691典型应用电路图
![](../img/eep-analog/analog-24244yy2w4fe1cil.jpg)
![](../img/eep-analog/analog-24245uzqs1cevnei.jpg)
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