Cxle8268 is a high precision step-down LED constant current control chip with source power factor correction, with dimming control function, which is suitable for the non isolated step-down LED constant current power supply with 85vac-265vac full range input voltage. Cxle8268 integrated active power factor correction circuit can achieve high power factor and low total harmonic distortion. Due to the critical continuous mode of inductor current, the power MOS transistor is in the zero current on state, the switching loss can be reduced, and the utilization rate of inductor is also high. The cxle8268 adopts a proprietary current sampling mechanism to achieve high-precision output constant current control. At the same time, the chip adopts patented line voltage and load voltage compensation technology, which can achieve excellent line voltage and load regulation rate. The line voltage compensation coefficient can also be flexibly adjusted by external components. Cxle8268 has multiple protection functions to enhance system reliability, including LED open circuit protection, led short circuit protection, chip power supply over-voltage protection, under voltage protection, current sampling resistance open circuit protection and cycle by cycle current limiting

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[ CXLE8268 ]"
目录
1.产品概述 2.产品特点 3.应用范围 4.技术规格书下载(PDF文档)
一.产品概述
CXLE8268是一款带有源功率因数校正的高精度降压型LED恒流控制芯片,带调光控制功能,适用于85Vac-265Vac全范围输入电压的非隔离降压式LED恒流电源。CXLE8268集成有源功率因数校正电路,可以实现很高的功率因数和很低的总谐波失真。由于工作在电感电流临界连续模式,功率MOS管处于零电流开通状态,开关损耗得以减小,同时电感的利用率也较高。 CXLE8268采用专有的电流采样机制,可实现高精度输出恒流控制。同时,芯片采用专利的线电压和负载 电压补偿技术,可以达到优异的线电压和负载调整 率。线电压补偿系数还可以通过外部元件灵活调整。 CXLE8268具有多重保护功能以加强系统可靠性,包括LED开路保护、LED 短路保护、芯片供电过压保护、 欠压保护、电流采样电阻开路保护和逐周期限流等。所有的保护状态都具有自动重启功能。另外,CXLE8268具有过热调节功能,在驱动电源过热时减小输出电流,以提高系统的可靠性。CXLE8268的过热调节温度可以通过外部电阻设定。
二.产品特点
有源功率因数校正,高PF值,低THD
高达95%的系统效率
带调光接口
±3%LED输出电流精度
优异的线电压调整率和负载调整率
电感电流临界连续模式
超低(33uA)启动电流
LED开路/短路保护
电流采样电阻开路保护
逐周期电流限流
芯片供电过压/欠压保护
自动重启功能
过热调节功能
过热调节温度可外部设定
采用SOP8封装
三.应用范围
GU10/E27 LED球泡灯、射灯
LED PAR30、PAR38灯
LED日光灯
其它LED照明
四.技术规格书(产品PDF)
需要详细的PDF规格书请扫一扫微信联系我们,还可以获得免费样品以及技术支持!
五.产品封装图
六.电路原理图
七.相关芯片选择指南 更多同类产品......
无级调光 | |||||||
Part number | Package| | PF | Topology | Pout Max(W) | MOS | Open Circuit | Dimming |
Protection | |||||||
CXLE8267 | SOP8 | 0.5 | BUCK | 24 | 550V/6.5Ω | - | PWM |
CXLE8267G | DIP7 | 0.5 | BUCK | 40 | 500V/3Ω | External | PWM |
CXLE8267H | DIP7 | 0.5 | BUCK | 50 | External | PWM | |
CXLE8275 | SOP16 | 0.5 | BUCK | 70/Chaneel | External | External | PWM |
CXLE8268 | SOP8 | 0.9 | BUCK | <50 | External | - | Analog |
CXLE8269 | SOP8 | 0.9 | FLYBACK/BUCK-BOOST | <50 | External | - | Analog |
CXLE8270 | SOP8 | 0.9 | BUCK | 10 | 300V/2Ω | External | PWM |
CXLE8271 | SOP8 | 0.9 | BUCK | 12 | 300V/1.2Ω | External | PWM |
CXLE8272 | SOP8 | 0.9 | BUCK | 650V/4.5Ω | External | ||
CXLE8273 | SOP8 | 0.9 | BUCK | External | |||
CXLE8274 | SOP8 | 0.9 | BUCK | <50 | 500V/0.5Ω | External | - |