Supertex HV9967 4W LED驱动解决方案

Supertex公司的HV9967是开环平均模式电流控制LED驱动器,集成了60V 0.8Ω MOSFET,可用作单独使用的降压转换器开关,LED电流精度3%,单个电阻设定LED电流,能和500V耗尽型MOSFET级联,主要应用在DC/DC或AC/DC LED驱动器,平板显示器的RGB背光,通用恒流源,信号和装饰LED照明以及充电器.本文介绍了HV9967主要特性,功能方框图, 典型应用电路图以及4W LED驱动器演示板主要指标, 电路图和材料清单.

4W LED Driver Demoboard with Accurate Average-Mode Constant Current Control

The HV9967 is an open loop average-mode current control LED driver IC operating in a constant off-time mode.

The IC features an integrated 60V 0.8Ω MOSFET that can be used as a stand-alone buck converter switch, or connected as a source driver output for driving an external high-voltage depletionmode MOSFET. The HV9967 is powered through its switching output when the integrated switch is off. Hence, the same external MOSFET can be used as a high-voltage linear regulator deriving the power supply voltage for powering the IC.
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