MIC4811中文资料High Current Six Channel WLED Driver w/ DAM and Ultrafast PWM Control数据手册Microchip规格书

描述 Description

The MIC4811 is a high efficiency linear White LED (WLED) driver designed to drive up to six high current WLEDs for signage lighting. The MIC4811 provides the highest possible efficiency as this architecture has no switching losses present in traditional charge pumps or inductive boost circuits. The MIC4811 provides six linear drivers which maintain constant current for up to six WLEDs. It features a typical dropout of 100mV at 50mA.The MIC4811 features Dynamic Average Matching™ (DAM™) which is specifically designed to provide optimum matching across all WLEDs. The high accuracy (±1% typical) current regulated WLED channels ensure uniform display illumination under all conditions. The brightness is controlled through an Ultra Fast PWM™ interface operating down to less than 1% duty cycle.The MIC4811 is available in a 10-pin MSOP package with a junction temperature range of -40°C to +125°C

特性 Features

• High efficiency (no voltage boost losses)
• Ultra Fast PWM™ control (200Hz to 500kHz)
• Input voltage range: 3.0V to 5.5V
• LED current range up to 50mA per channel
• Programmable LED current with external resistor
• Dropout of 100mV at 50mA
• Matching better than ±1% (typical)
• Current accuracy better than ±1% (typical)
• Maintains proper regulation regardless of how many channels are utilized
• 10-pin MSOP package

简介

MIC4811属于集成电路（IC）的LED驱动器。由制造生产的MIC4811LED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。