The CXLE8121 is a 1.3MHz PWM boost switching regu- lator designed for
constant-current white LED driver applications.
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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
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|
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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调光频 率范围 |
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PWM |
2.5V-10V |
29V |
0.1V |
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0.1uA |
1.3MHz |
PWM |
SOT-25 |
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|
PWM |
2.2V-6.0V |
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调光频 率范围 |
封装 |
|
|
PWM |
2.2V-6.0V |
17V |
0.25V |
700mA |
82% |
3mA |
1.4MHz |
PWM |
100Hz-1KHz |
SOT-26 |
|
|
PWM |
2.5V-6.0V |
23V |
0.25V |
1.0A |
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0.4mA |
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PWM |
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SOT-26 |
|
|
PWM |
2.5V-6.0V |
30V |
0.104V |
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0.2mA |
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PWM |
小于1KHz |
SOT-26 |
|
|
PWM |
2.7V-6.0V |
38V |
0.2V |
1A |
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5uA |
0.8MHz |
PWM |
SOT-26 |
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|
PWM |
2.7V-6.0V |
37V |
0.3V |
900mA |
90% |
0.28mA |
0.9MHz |
PWM |
100Hz-200KHz |
SOT-26 |
|
|
PWM |
2.5V-6.0V |
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0.1V/0.25V /0.3V |
1.5A |
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PWM |
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SOT-26 |
|
|
PWM |
3.0V-25V |
28V |
0.2V |
2A |
90% |
1uA |
1.2MHz |
PWM |
20KHz-1MHz |
SOT-26 |
|
|
PWM |
2.7V-6.5V |
22V |
0.2V |
2.8A |
95% |
5uA |
1MHz |
PWM |
SOT-26 |
||
|
PWM |
3.0V-6.0V |
24V |
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PWM |
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|
PWM |
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27V |
0.2V |
3A |
100uA |
800KHz |
PWM |
DFN3*3-8 |
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|
PWM |
10V-35V |
200V |
0.2V |
扩流 |
400uA |
200KHz |
PWM |
SOP-8 |
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|
PWM |
3.6V-26V |
32V |
0.22V |
2A |
92% |
400KHz |
PWM |
SOP-8 |
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|
PWM |
3.6V-26V |
60V |
0.22V |
2A |
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400KHz |
PWM |
SOP-8 |
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|
PWM |
5.0V-45V |
60V |
0.22V |
2A |
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400KHz |
PWM |
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|
PWM |
3.6V-36V |
60V |
0.22V |
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型号 |
工作模式 |
工作电 压范围 |
过压 保护电压 |
反馈电压 |
开关 电流限制 |
静态电流 |
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调光形式 |
调光频 率范围 |
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|
|
PWM |
2.7V-16V |
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0.2V |
340mA |
81% |
3.2uA |
1.2MHz |
PWM |
SOT-2 |
||
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