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产品TPS61169TI
描述

TPS61169 是一款升压转换器,配有额定电压为 40V 的集成开关场效应晶体管 (FET),可驱动 LED 串。 该升压转换器内部具有一个 40V、1.8A 金属氧化物半导体场效应晶体管 (MOSFET),电流下限为 1.2A,可针对小型或大型面板背光照明驱动单个 LED 或 LED 串。 默认的白色 LED 电流通过外部传感器电阻 RSET 设定,反馈电压稳压至 204mV,如 所示。 运行期间,LED 电流可通过施加到 CTRL 引脚上的脉宽调制 (PWM) 信号加以控制,该信号的占空比决定反馈基准电压。 TPS61169 不会突发 LED 电流,因此不会在输出电容器上产生可闻噪声。 为提供最佳保护,该器件集成了 LED 开路保护特性,该特性会在 LED 开路状态下禁用 TPS61169,以防止输出电压超过 IC 最大绝对额定电压。

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