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

簡介

MIC3223屬于集成電路（IC）的LED驅動器。由制造生產的MIC3223LED 驅動器器件屬于 LED 驅動器電源管理集成電路 (PMIC) 系列，可通過標稱固定電壓的電源為負載（通常為發(fā)光二極管）提供電流，并且電流可控。它與用于電壓調節(jié)的類似產品的主要區(qū)別在于，這類器件提供較低的反饋電壓（以提高系統(tǒng)能效），而且通?？蓪ζ骷ぷ鼽c進行外部控制，可在照明應用中用于實現調光功能。