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RT8555是高效率白光LED驱动器,它适用于单/双电池输入驱动LED灯条,用于驱动多达6个并联连接的 LED 串,每串 LED 可以多达10颗 LED串联。每串 LED 连接的电流源吸入电流的匹配误差最大在 ±2% 以内,确保各 LED 串之间的亮度一致性。为了给电流源吸入电流的操作预留足够的空间,Boost 控制器对各个回馈引脚中的最低电压进行监测并进行调节,同时确保得到一个最佳的转换效率。 RT8555 的输入电压范围宽达 2.7V~24V,包含I2C接口用于控制调光模式、操作频率及LED电流。其内置的100mΩ,36V电流模式控制的功率开关提供过流保护。RT8555 的开关切换工作频率在 300kHz~2MHz 之间可调,这提供了效率和组件尺寸选择上的灵活性。RT8555采用WL-CSP-20B 1.65 x 2.05 (BSC) 、0.4mm间距的封装。
宽输入电压范围 : 2.7V ~ 24V
高输出电压 : 高达36V
可程序设计通道电流 : 10mA ~ 35mA
±3%精准度与±2%匹配误差的通道电流调节
调光控制►直接PWM调光可达20kHz,最小导通时间400ns►PWM转模拟调光可达20kHz和8位分辨率
I2C可编程LED电流,开关频率,调光模式
OTP内嵌式内存
切换频率 : 300kHz ~ 2MHz
保护►LED串开路侦测►电流限制►可程序设计的过压保护►过热保护
20脚WL-CSP,0.4mm间距封装
符合RoHS规范,不含卤素
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