CAT4139AEVB,DC-DC 升压转换器评估板。 CAT4139 是一款
DC/DC 升压转换器,可提供非常适合驱动 LED 的精确
恒定电流。该器件以 1MHz 的固定开关频率运行,可与小值外部陶瓷电容器和
电感器一起使用。串联的 LED 由外部电阻 R1 设置的调节电流驱动。 CAT4139 非常适合驱动最多五个串联白色 LED 的
并联灯串或高达 22V
说明
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CAT4139AEVB, DC-DC Step-Up Converter Evaluation Board. The CAT4139 is a DC/DC step-up converter that delivers an accurate constant current ideal for driving LEDs. Operation at a fixed switching frequency of 1MHz allows the device to be used with small value external ceramic capacitors and inductor. LEDs connected in series are driven with a regulated current set by the external resistor R1. The CAT4139 is ideal for driving parallel strings of up to five white LEDs in series or up to 22V