CXLE8121是一个1.3MHz的脉冲宽度调制升压开关调节器，专为恒流白光LED驱动应用。
CXLE8121可以从3.2V电源驱动多达4个白色LED的字符串或6个5V电源的白色LED串联，确保亮度均匀，并消除几个镇流器电阻器。CXLE8121实现了1.3MHz的恒频PWM控制方案。高频PWM操作还通过减少外部组件大小来节省板空间。为了提高效率，将反馈电压设置为95毫伏，从而减少电流设置电阻器中的功耗。CXLE8121具有过电压保护能力，开关管脚监控输出电压，如果出现过电压情况，将关闭设备，以防止开路情况造成的损坏。
1.）固有均匀LED电流
2）效率高达84%
3.）从3.2V电源或6
4.）5V电源的LED
5.）1.3MHz脉宽调制工作频率
6.）只需要0.22μF的输出电容器
7.）关断电流：<1μA
8.）内置输出过电压保护
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[ CXLE8121 ]"
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 CXLE8121 is a 1.3MHz PWM boost switching regu- lator designed for
constant-current white LED driver applications.
The CXLE8121 can drive a string of up to 4 white LEDs from a 3.2V supply
or 6 white LEDs from a 5V supply in series, ensuring uniform brightness and eliminating several ballast resistors. The CXLE8121 implements a constant frequency 1.3MHz PWM control scheme.The high frequency PWM operation
also saves board space by reducing external component sizes. To improve efficiency, the feedback voltage is set to 95·mV, which reduces the power dissipation in the current setting resistor.The CXLE8121 is equipped with OVP protection ability,the SW pin monitors the output voltage and will turn off the device if an overvoltage condition is present to prevent damage from an open circuit condition.
The CXLE8121 is available in SOT-23-5 package.
二.产品特点(Features)
1.)Inherently Uniform LED Current
2.)High Efficiency up to 84%
3.)Drives up to 4 LEDs from a 3.2V Supply or 6
4.)LEDs from a 5V Supply
5.)1.3MHz PWM Operation Frequency
6.)Requires Only 0.22μF Output Capacitor
7.)Shutdown Current: < 1μA
8.)Built-in Output Overvoltage Protection
三,应用范围 (Applications)
Digital Cameras
LCD modules
GPS Receivers
Cellular Phones
PDAs, Handheld Computers
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 Number |
Pin Name |
Function |
|
1 |
SW |
Switch Pin. Connect inductor/diode here. The output voltage can range up to 29V but not |
|
2 |
GND |
Ground Pin. |
|
3 |
FB |
Voltage Feedback. Reference voltage is 95mV. |
|
4 |
SHDN |
Shutdown Pin. Connect to 1.5V or higher to enable device; |
|
5 |
V |
Input Supply Pin. Must be locally bypassed. |
六.电路原理图
七,功能概述
|
Parameter |
Symbol |
Value |
Unit |
|
Input Voltage |
V |
10 |
V |
|
SW Voltage |
36 |
V |
|
|
FB Voltage |
10 |
V |
|
|
SHDN Voltage |
10 |
V |
|
|
Maximum Junction Temperature |
125 |
o |
|
|
Storage Temperature Range |
T |
-65 to 150 |
o |
|
Lead Temperature (Soldering, 10sec) |
T |
300 |
o |
|
ESD (Machine Model) |
250 |
V |
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