On Semi FL7734低功率相切可调光LED 照明解决方案
On Semi公司的FL7734是具有高级初级端调节 (PSR) 技术的高度集成 PWM 控制器,用于低功率相切可调光LED照明解决方案,可以自动检测是否有调光,能实现优秀的调光兼容而不会出现闪烁,具有开路LED保护, 短路LED保护, 检测电阻短路保护,逐周期限流和过温保护(带自动重启).主要用在相位切割调光LED照明.本文介绍了FL7734主要特性,以及评估板FEBFL7734-L55H008A-GEVB主要特性,电路图和材料清单.
The FL7734 is a highly integrated PWM controller with advanced Primary-Side-Regulation (PSR) technique to minimize components for low power LED lighting solutions. Using the innovative TRUECURRENT technology for tight constant-current control, it enables designs with constant-current (CC) tolerance of less than ±1% in the wide line voltage range to meet stringent LED brightness requirements.
FL7734 can operate with all types of phase cut dimmers. Phase cut dimming is managed smoothly by bleeding current control to achieve excellent dimmer compatibility without flicker.
The controller can automatically detect whether there is a dimmer connection. In non dimming mode, the operating mode is set to optimize power factor and THD by enabling linear frequency control and voltage mode based on DCM.
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