CXLE8128A CXLE8128B CXLE8128C是一种用于驱动多达7个系列的升压转换器单电池锂离子电池的白色LED。CXLE8128A/B/C采用电流模式、固定频率结构来调节LED电流。通过外接电流感测电阻测量，CXLE8128A/B/C具有欠压闭锁、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LC滤波器值小、工作电流小、效率高的要求。内部软启动功能可降低励磁涌流。微型封装类型为节省PCB空间和总BOM成本提供了最佳解决方案。
高效：高达90%
1.2MHz定频运行
集成内功率MOSFET
驱动7系列WLEDs系列
UVLO，热关机
内部电流限制
过电压保护
小型LC滤波器
最小化外部组件
<1μA关断电流
-
[ CXLE8128A/B/C ]"
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 CXLE8128A/B/C is a step-up converter designed for driving up to 7 series
white LEDs from a single cell Lithium lon battery . The CXLE8128A/B/C uses current mode， fixed frequency architecture to regulate an LED current. which is measured through an external current sense resistor.The CXLE8128A/B/C includes unde voltage lockout，current limiting and thermal overload protection preventing damage in the event of an output overload.Optimized operation frequency can meet the requirement of small LC filters value and low operation current with high efficiency. Internal soft start function can reduce the inrush current. Tiny package type provide the best solution for PCB space saving and total BOM cost.
二.产品特点(Features)
High Efficiency: Up to 90%
1.2MHz Constant Frequency Operation
Integrated internal Power MOSFET
Drives up to 7 Series WLEDs Range
UVLO, Thermal Shutdown
Internal Current limit
Over Voltage Protection
Small LC Filter
Minimize the External Component
<1μA Shutdown Current
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 |
|
|
1 |
Inductor Connection. Connect to the switched side of the external inductor as well as the anode of the external diode. SW is highimpedance during shutdown. |
|
GND |
2 |
Ground Pin. |
|
FB |
3 |
Current-Sense Feedback Input. Connect a resistor from FB to GND to set the LED current. |
|
EN |
4 |
Enable and LED Brightness Control Input. Pull high to turn on IC.Drive EN with a 20kHz to 1MHz unfiltered PWM dimming signal for DC LED current that is proportional to the signal’s duty cycle. |
|
OV |
5 |
Over Voltage Input.The CXLE8128A/B/C turn off the N-channel MOSFET when VOUT exceeds 28V .Connect OV to the output at the top of the LED string. |
|
VIN |
6 |
Power Supply Input. Must be closely decoupled to GND with a 1μF orgreater ceramic capacitor. |
六.电路原理图
七,功能概述
|
PARAMETER |
CONDITIONS |
MIN |
TYP |
MAX |
UNIT |
|
Operating Input Voltage |
2.5 |
5.5 |
V |
||
|
Under Voltage Lockout |
2.2 |
2.45 |
V |
||
|
Under Voltage Lockout |
100 |
mV |
|||
|
Current (Shutdown) |
V EN<0.4V |
0.1 |
1 |
μA |
|
|
Quiescent Current |
V FB=0.15V，No switching |
200 |
300 |
μA |
|
|
Supply Current |
V FB=0V，switching |
0.6 |
1 |
mA |
|
|
Regulated Feedback |
CXLE8128A/B/C-28J |
94 |
104 |
114 |
mV |
|
CXLE8128A/B/CAS6 |
94 |
104 |
114 |
mV |
|
|
CXLE8128A/B/CBS6 |
238 |
250 |
262 |
mV |
|
|
CXLE8128A/B/CCS6 |
285 |
300 |
315 |
mV |
|
|
Switching Frequency |
1.2 |
MHz |
|||
|
ON Resistance of NMOS |
0.5 |
Ω |
|||
|
Peak Current Limit |
V IN= 4.2V,Duty cycle=50% |
1.5 |
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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