CXLE8856

CXLE8856是一个设置的DC-DC转换器,提供可调节的输出电流。设备以1.0兆赫的恒定频率切换,允许使用小值外部电感和陶瓷电容器。CXLE8856用于驱动双电池碱性电池的高达1A的负载。LED电流可由内部智能模块自动调节,并由连接在反馈引脚(FB)和接地之间的外部电流感测电阻器Rs进行编程。低95mV(典型值)反馈电压降低功率为提高效率而损失卢比。该装置内置2A、100mΩNMOS开关,即使在重载情况下也能提供高效率。在停机期间模式下,反馈电阻器Rs和负载完全断开,电流消耗降低到1uA
LED功率效率:高达90%
电流精度:5%
低启动电压:0.9V
低保持电压:0.75V
1MHz开关频率
使用小型、低调的外部组件

CXLE8856 DC转换器可调节的输出电流内部智能模块自动调节连接在反馈引脚FB和接地之间的外部电流感测电阻器Rs进行编程驱动双电池碱性电池的高达1A的负载

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产品简介

目录ZJW嘉泰姆

1.产品概述                       2.产品特点ZJW嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 ZJW嘉泰姆
5.产品封装图                     6.电路原理图                   ZJW嘉泰姆
7.功能概述                        8.相关产品
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一,产品概述(General Description)    ZJW嘉泰姆


   The CXLE8856 is a set-up DC-DC converter that delivers a regulated output current. The device switches at a 1.0MHz constant frequency, allowing for theZJW嘉泰姆
use of small value external inductor and ceramic capacitors.The CXLE8856 is targeted to be used for driving loads up to 1A from a two-cell alkaline battery.ZJW嘉泰姆
    The LED current can be auto adjusted by internal smart module and programmed by the external current sense resistor, Rs,connected between the feedback pin (FB) and ground. A low 95mV(TYP.) feedback voltage reduces the powerZJW嘉泰姆
loss in the Rs for better efficiency. With its internal 2A,100mΩ NMOS switch, the device can provide high efficiency even at heavy load. During the shutdownZJW嘉泰姆
mode, the feedback resistor Rs and the load are completely disconnected and the current consumption is reduced to 1uA.The CXLE8856 is available in the 6-leadZJW嘉泰姆
SOT-23-6L package.ZJW嘉泰姆
二.产品特点(Features)
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LED Power Efficiency: up to 90%ZJW嘉泰姆
Current Accuracy: 5%(Vin =3.6V to 1.8VZJW嘉泰姆
@Vf =3.7V)ZJW嘉泰姆
Low Start-Up Voltage: 0.9VZJW嘉泰姆
Low Hold Voltage:0.75VZJW嘉泰姆
1MHz Switching FrequencyZJW嘉泰姆
Uses small, Low Profile External ComponentsZJW嘉泰姆
Low RDS(ON) : 100mΩ (TYP.)ZJW嘉泰姆
Over Temperature ProtectionZJW嘉泰姆
Low Profile SOT-23-6L PackageZJW嘉泰姆
三,应用范围 (Applications)
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White LED Torch (Flashlight)ZJW嘉泰姆
White LED Camera FlashZJW嘉泰姆
DSC(Digital Still Camera)FlashZJW嘉泰姆
Cellular Camera Phone FlashZJW嘉泰姆
PDA Camera FlashZJW嘉泰姆
Camcorder Torch(Flashlight) LampZJW嘉泰姆
四.下载产品资料PDF文档 
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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!ZJW嘉泰姆

 QQ截图20160419174301.jpgZJW嘉泰姆

五,产品封装图 (Package)ZJW嘉泰姆


image.pngZJW嘉泰姆

Pin No.ZJW嘉泰姆

Pin NameZJW嘉泰姆

Pin FunctionZJW嘉泰姆

1ZJW嘉泰姆

SWZJW嘉泰姆

Switching Pin.ZJW嘉泰姆

2ZJW嘉泰姆

GNDZJW嘉泰姆

Ground Pin.ZJW嘉泰姆

3ZJW嘉泰姆

FBZJW嘉泰姆

Feedback Pin.ZJW嘉泰姆

4ZJW嘉泰姆

ENZJW嘉泰姆

Chip Enable(Active High).ZJW嘉泰姆

5ZJW嘉泰姆

VOUTZJW嘉泰姆

Output Voltage Pin.ZJW嘉泰姆

6ZJW嘉泰姆

VINZJW嘉泰姆

Input Supply.ZJW嘉泰姆

六.电路原理图ZJW嘉泰姆


image.pngZJW嘉泰姆
七,功能概述ZJW嘉泰姆


Inductor SelectionZJW嘉泰姆
The CXLE8856 can use small value inductors due to its switching frequency of 1MHz. The value of inductor will focus in the range of 2.2uH to 4.7uH for most CXLE8856 applications. In typical high current white LED applications,it is recommended to use a 4.7uH inductor. The inductor should have low DCR (DC resistance) to minimize the IR power loss, and it requires a current rating of 2A to handle the peak inductor current without saturating. ZJW嘉泰姆
Capacitor SelectionZJW嘉泰姆
An input capacitor is required to reduce the input ripple and noise for proper operation of the CXLE8856. For good input decoupling,  Low  ESR(equivalent  series  resistance) capacitors should be used at the input. At least 2.2uF input capacitor  is  recommended  for  most  applications. A minimum output capacitor value of 6.8uF is recommended under normal operating conditions, while a 10uF-22uF capacitor may be required for higher power LED current. A reasonable value of the output capacitor depends on the LED current. The ESR of the output capacitor is the important parameter to determine the output voltage ripple of the converter, so low ESR capacitors should be used at the output to reduce the output voltage ripple. The small size of ceramic capacitors is an excellent choice for CXLE8856 applications. The X5R and X7R types are preferred because they maintain capacitance over wide voltage and temperature ranges.ZJW嘉泰姆
Diode SelectionZJW嘉泰姆
It's indispensable to use a Schottky diode rated at 2A with the CXLE8856. Using a Schottky diode with a lower forward voltage drop is better to improve the power LED efficiency, and its voltage rating should be greater than the output voltage. In application, the ON Semiconductor MBRA210LT3G is recommended. ZJW嘉泰姆
LED Current SettingZJW嘉泰姆
The LED current is set by the single external Rs resistor connected to the FB pin as shown in the typical application circuit on page 1. The typical FB reference is internally regulated to 95mV(TYP.). The LED current is 95mV/Rs. It's recommended to use a 1% or better precision resistor for the better LED current accuracy.ZJW嘉泰姆
The formula and table 1 for Rs selection are shown as follows:ZJW嘉泰姆
Rs=95mV/ILEDZJW嘉泰姆
PCB Layout GuidelinesZJW嘉泰姆
For best performance of the CXLE8856, the following guidelines must be strictly followed. Input and Output capacitors should be placed close to the IC and connected to ground plane to reduce noise coupling.Keep the main current traces as possible as short and wide.SW node of DC-DC converter is with high frequency voltage swing. It should be kept at a small area.Place the feedback components as close as possible to the IC and keep away from the noisy devices.ZJW嘉泰姆
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