CXLE8129是一个升压转换器，设计用于从单电池锂离子电池驱动多达7个系列的白光LED。CXLE8129采用电流模式、固定频率结构来调节LED，LED通过外部电流感测电阻器进行测量。它的低200mV反馈电压降低了功率损耗，提高了效率
CXLE8129包括欠压闭锁、限流和热过载保护，防止输出过载时损坏，优化的工作频率能满足小LC滤波器值和高效率工作电流的要求。内部软启动功能可减少涌流电流。微型封装形式为PCB节省空间和总BOM公司提供了最佳解决方案
1）高效：高达90%
2.）1.2兆赫恒频运行
3.）集成内功率MOSFET
4.）驱动多达7个系列的WLED
5.）低200mV反馈电压
6.）宽频率范围软启动/调光
7.）紫外线照射，热关机
8.）内部电流限制
9.）过电压保护
10.）小LC滤波器
11.）最小化外部组件
12.）<1μA关断电流
13.）SOT33-6包装
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[ CXLE8129 ]"
目录
1.产品概述 2.产品特点
3.应用范围 4.下载产品资料PDF文档
5.产品封装图 6.电路原理图
7.功能概述 8.相关产品
一,产品概述(General Description)
The CXLE8129 is a step-up converter designed for driving up to 7 series whiteLEDs from a single cell Lithium lon batle . The CXLE8129 uses current mode， fixed frequency architecture to regulate an LED hich is measured through an external current sense resistor. Its low 200mV feedback voltage reduces power loss and improves efficiency
The CXLE8129 includes under-voltage lockout，current limiting and thermal overload protectionpreventing damage in the event of an output overload.Optimized operation frequency can meet the requirement of small LC filters value and operation current with high efficiency. Internal soft start function can reduce the inrush curren . Tiny package type provide the best solution for PCB space saving and total BOM co
二.产品特点(Features)
1.)High Efficiency: Up to 90%
2.)1.2MHz Constant Frequency Operation
3.)Integrated internal Power MOSFET
4.)Drives up to 7 Series WLEDs
5.)Low 200mV Feedback Voltage
6.)Soft-start/Dimming with wide Frequency Range
7.)UVLO, Thermal Shutdown
8.)Internal Current limit
9.)Over Voltage Protection
10.)Small LC Filter
11.)Minimize the External Component
12.)<1μA Shutdown Current
13.)SOT23-6 Package
三,应用范围 (Applications)
Camera Flash White LED
Mobile Phone, Smart Phone LED Backlight
PDA LED Backlight
Digital Still Cameras
Camcorder
四.下载产品资料PDF文档
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 (Package)
|
Pin Name |
Pin Number |
Description |
|
SW |
1 |
Inductor Connection. Connect to the switched side of the external |
|
GND |
2 |
Ground Pin. |
|
FB |
3 |
Current-Sense Feedback Input. Connect a resistor from FB to GND to set |
|
EN |
4 |
Enable and LED Brightness Control Input. Pull high to turn on IC.Drive EN |
|
|
5 |
Over Voltage Input. The CXLE8129 turn off the N-channel MOSFET when |
|
VIN |
6 |
Power Supply Input. Must be closely decoupled to GND with a 1μF or |
六.电路原理图
七,功能概述
|
PARAMETER |
CONDITIONS |
MIN |
TYP |
MAX |
UNIT |
|
Operating Input Voltage |
3 |
24 |
V |
||
|
Under Voltage Lockout |
2.6 |
V |
|||
|
Under Voltage Lockout |
100 |
mV |
|||
|
Current (Shutdown) |
V EN<0.4V |
1 |
μA |
||
|
Quiescent Current |
V FB=0.15V，No switching |
200 |
μA |
||
|
Supply Current |
V FB=0V，switching |
0.6 |
1 |
mA |
|
|
Regulated Feedback |
194 |
200 |
206 |
mV |
|
|
Switching Frequency |
1.2 |
MHz |
|||
|
ON Resistance of NMOS |
0.1 |
Ω |
|||
|
Peak Current Limit |
V IN= 4.2V,Duty cycle=50% |
2 |
A |
||
|
EN Shutdown Voltage |
0.4 |
V |
|||
|
EN Enable Voltage |
1.5 |
V |
|||
|
EN Leakage Current |
±0.01 |
±1.0 |
μA |
||
|
OVP Threshold |
Open LED,V OUT Rising |
28 |
V |
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