开发者 : 腾跃芯科

应用领域 : LED应用

方案类型 : 原型方案

主芯片/主要器件 : CX5816、调光器

方案概述

目前在市面上销售的普通节能灯是不可以进行调光的，在不需要太亮的时候，能源就白白流失了，大家都在找寻可以和白炽灯一样可以方便的进行调光的节能灯。而CX5816是一款具有开关调光功能的高性能AC/DC隔离式LED电源驱动芯片。这款芯片不需要外接任何调光器，只需通过普通电源开关的多次开关动作就能实现调光功能。芯片自动检测开关动作并转换成调光信号，实现25%、10%四级调光，具有转换效率高、电路简单等特点。

功能定义及性能指标

输入电压范围：120-230Vac

输出规格：40V300mA

效率＞80%

恒流精度：±5%

CX5816概述

CX5816是一种高性能的AC/DC开关四级调光LED驱动器。它采用PFM方法建立DCM反激电源供应。它在初级侧感测和调节，消除二次反馈电路的需要。该驱动在PFM CC模式和开关CV模式下运作。CX5816带有四段调光功能. 这意味着输出电流将被调整到100%时，次上电对应于阶段，55%时二次上电对应的第二阶段，25%时第三次上电对应的第三个阶段和10%时第四次上电对应的第四个阶段。当第五次上电时周期将重新启动。如果断电时间少于0.8秒电源周期将继续.

特征  

l 四级调光功能

l  5% 输出电流精度

l 恒频加速启动

l 不需使用光耦和TL431

l 内置短路保护，电源过压保护

l 逐周期限流

l VDD滞后欠压锁定(UVLO)

l SOT23-5封装，输出功率3W

 应用

l LED 彩灯

l LED 灯泡 ( E14、E27 等)

l LED 床头灯

CX5816  ON/OFF Dimming LED Driver IC

General Description

The CX5816 is a high performance AC/DC on/off LED driver with four-stages dimming. It uses PFM method to build DCM fly-back power supplies. It operates in primary-side sensing and regulation while removing the need of secondary feedback circuitry. The device operates in PFM in CC mode and ON-OFF in CV mode. The CX5816 has a four-stages dimming function. That means the output current will be adjusted to 100% when the first time power on corresponding to the first stage, 55% when the second time power on corresponding to the second stage, 25% when the third time power on corresponding to the third stage and 10% when the fourth time power on corresponding to the fourth stage. The cycle will restart to stage-one again when the fifth time power on. So this cycle will go on if the power off time is no more than 0.8 seconds.

Features  

 4 stages dimming function with ordinary switch

 Typical 5% output Current Accuracy

 Constant frequency start-up mode accelerate start-up process

 Eliminates Opto-coupler and TL431

 Built-in Short Circuit Protection, VDD Over Voltage Protection

 Cycle-by-Cycle Current Limiting

 VDD Under Voltage Lockout with Hysteresis (UVLO)

 Small SOT23-5 Package

 Application

 LED lampion

 LED bulb ( E14、E27 etc)

 LED bedlamp