MIC3223中文资料High Power Boost LED Driver with Integrated FET数据手册Microchip规格书

描述 Description

The MIC3223 is a constant current boost LED driver capable of driving a series string of high power LEDs. The MIC3223 can be used in general lighting, bulb replacement, garden pathway lighting, and other solid state illumination application.The MIC3223 is a peak current mode control PWM boost regulator and the 4.5V and 20V operating input voltage range allows multiple applications from a 5V or a 12V bus. The MIC3223 implements a fixed internal 1MHz switching frequency to allow for a reduction in the design footprint size. Power consumption has been minimized through the implementation of a 200mV feedback voltage that provides an accuracy of ±5%. The MIC3223 can be dimmed through the use of a PWM signal and features an enable pin for a low power shutdown state.The MIC3223 is a very robust LED driver and offers the following protection features: over voltage protection (OVP), thermal shutdown, switch current limiting and under voltage lockout (UVLO).The MIC3223 is offered in a low profile exposed pad 16-pin TSSOP package.

特性 Features

• 4.5V to 20V supply voltage
• 200mV feedback voltage with an accuracy of ±5%
• Step-up output voltage (boost) conversion up to 37V
• 1MHz switching frequency
• 100mΩ/3.5A internal power FET switch
• LEDs can be dimmed using a PWM signal
• User settable LED current (through external resistor)
• Externally programmable soft-start
• Protection features that include:
• Output over voltage protection (OVP)
• Under voltage lockout (UVLO)
• Over temperature protection
• Junction temperature range: -40°C to +125°C
• Available in an exposed pad 16-pin TSSOP package

简介

MIC3223属于集成电路（IC）的LED驱动器。由制造生产的MIC3223LED 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。