概述
QX2305 是一款高效率, 稳定可靠的高亮度LED 灯驱动控制 IC,内置高精度比较器,off-time 控制电路,恒流驱动控制电路等,特别适合大功率, 多个高亮度 LED 灯串恒流驱动。 QX2305采用固定off-time控制工作方式,其工作频率高达 2.5MHz,可使外部电感和滤波电容、体积减少,效率提高。off-time 最小时间,可通过外部电阻和电感进行设置,工作频率根据用户要求而改变。在 EN 端加 PWM 信号,可调节 LED 灯的亮度。 通过调节外置的电阻,能控制高亮度 LED灯的驱动电流,使 LED 灯亮度达到预期恒定亮度,流过高亮度 LED 灯的电流可从几毫安到 1安培变化。
特性
可编程驱动电流
高效率:最高达 90%
宽输入电压范围:2V~400V
高工作频率:>1.5MHz
工作频率可调:500KHz~1.5MHz
驱动 LED 灯功能强: LED 灯串可从 1 个到几十个 LED 高亮度灯
亮度可调:通过 EN 端 PWM,调节 LED 灯亮度
应用
干电池供电 LED 灯串
LED 灯杯
RGB 大显屏高亮度 LED 灯
平板显示器 LED 背光灯
恒流充电器控制
通用恒流源
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