CXLE8222是一种连续模式感应降压转换器，设计用于驱动从高于LED电压。该装置通过6V至32V之间的输入电源工作，并提供外部输出电流高达1.4A，取决于电源电压和外部组件，这可以提供高达24瓦的输出功率。CXLE8222包括输出开关和高压侧输出电流感应电路，
它使用一个外部电阻来设置额定平均输出电流。输出电流可通过向“ADJ”引脚施加外部控制信号进行调整。ADJ引脚将接受直流电压或脉冲宽度调制波形。在直流调光期间，这将提供
与外部施加的直流电压成比例的连续输出电流。在这将提供门控输出电流，并且平均电流与占空比成比例。在调整销圈上施加0.2V或更低的电压输出关闭并将设备切换到低电流待机状态。
简单低零件数
内部32V NDMOS开关
高达1.4A输出电流
使用直流电压或脉宽调制的单脚开关和亮度控制
软启动
高效率（高达97%）
宽输入电压范围：6V至32V
输出停机
高达1MHz的开关频率
固有开路LED保护
典型的4%输出电流精度
高压侧电流检测
滞后控制：无补偿
调节恒定LED电流
过温保护
[ CXLE8222 ]
产品技术资料帮助
查看全部>
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
The CXLE8222 is a continuous mode inductive step-down converter, designed for driving
single or multiple series connected LEDs efficiently from a voltage source higher than
the LED voltage. The device operates from an input supply between 6V and 32V and provides
an externally output current up to 1.4A. Depending upon supply voltage and external
components, this can provides up to 24 watts of output power.
The CXLE8222 includes the output switch and a high-side output current sensing circuit,
which uses an external resistor to set the nominal average output current. Output current
can be adjusted by applying an external control signal to the 'ADJ' pin. The ADJ pin will accept either a DC voltage or a PWM waveform. During DC dimming, this will provide a
continuous output current that is proportional to the external applied DC voltage. During
the PWM dimming, this will provide a gated output current and the average current is proportional to the duty cycle. Applying a voltage of 0.2V or lower to the ADJ pin turns
the output off and switches the device into a low current standby state.
二.产品特点
Simple low parts count
Internal 32V NDMOS switch
Up to 1.4A output current
Single pin on/off and brightness control using DC voltage or PWM
Soft Start
High efficiency (up to 97%)
Wide input voltage range: 6V to 32V
Output shutdown
Up to 1MHz switching frequency
Inherent open-circuit LED protection
Typical 4% output current accuracy
High-side current sense
Hysteretic control: no compensation
AdjustaJTMBe constant LED current
Over temperature protection
Pb-free SOT89-5 packages
三.应用范围
Low voltage halogen replacement LEDs
Automotive lighting
Low voltage industrial lighting
LED back-up lighting
Illuminated signs
LCD TV backlighting
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
| DC/DC LED驱动(DC/DC LED Driver) | ||||||||
| Part No. | Features | Mode | VIN | IOUT | Current Accu. | EMI/EMC | IQ | Package |
| CXLE8222 | High Brightness Step-down LED Driver With Internal Switch Driving Up To 9 High Power LEDs, Operating Temperature Range: -40~125℃ | Hysteretic Control,1MHz Max | 6~32V | 1.4A | ±4% | 优化处理 | 50μA | SOT89-5 |
|
|||||||||||||||||
