Micrel MIC3203 HBLED驱动方案
Micrel 公司的MIC3203降压恒流高亮度LED(HBLED)驱动器,输入电压从4.5V到42V,效率大于90%,LED的电流精度±5%,开关频率高达1.5MHz,主要用在建筑物,工业和环境照明,LED灯,指示器和紧急照明,街道照明以及12V照明系统.本文介绍了MIC3203主要特性, 方框图, 降压LED驱动器电路和MIC3203/MIC3203-1 评估板电路图与材料清单(BOM).
High-Brightness LED Driver Controller with High-Side Current Sense
The MIC3203 is a hysteretic, step-down, constant-current, High-Brightness LED (HB LED) driver. It provides an ideal solution for interior/exterior lighting, architectural and ambient lighting, LED bulbs, and other general illumination applications.
The MIC3203 is well suited for lighting applications requiring a wide-input voltage range.
The hysteretic control gives good supply rejection and fast response during load transients and PWM dimming. The high-side current sensing and on-chip current-sense amplifier delivers LED current with ±5% accuracy. An external high-side currentsense resistor is used to set the output current.
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