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RT8547 是高效率、大电流的升压型闪光灯LED驱动器,能够提供最大1.6A输出电流,是在所有的单节锂离子/聚合物电池供电产品的LED照相闪光灯应用的理想电源解决方案。RT8547藉由切换内部高端和低端功率开关开关晶体管来保持输出电流调节,功率开关脉宽调制频率为2MHz的固定频率。高操作频率使RT8547可使用较小的电感和输出电容,适用于小型电池供电的应用。单线调光控制功能设计用于通过闪光灯LED的FLSET引脚设定闪控模式电流层级。RT8547包含过压保护、过流保护和过温保护功能以保护器件免受输出开路和短路情况。内置的内部软启动控制电路防止在启动期间冲击电流过大。在关断模式下,电源消耗仅2μA。
2.8V~5.5V 输入电压范围
电流精度在5%之内
高达1.6A调节输出电流
使用小型电感,效率可高达 88%
2MHz开关频率
分离的闪控和手电筒模式电流
可程序设计的安全定时器
输入电流限制
LED开路的过压保护
过温保护
确实断开负载连接
关机电流 : <2μA
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