The chip works in the critical continuous and intermittent mode of inductive current, and is suitable for the non isolated step-down LED constant current power supply with the input voltage of 85vac-265vac.
When cxle8381 / A / b adopts four section dimming, the output current of the first switch is 100%, the output current of the second switch is 50%, the output current of the third switch is 25%, and the output current of the fourth switch is 12.5%. If the chip is set in three dimming sections, it will be 100%, 50% and 12.5% respectively. When the switch is closed for more than 5S, the chip will restart to the first power on state of 100% output current.
Cxle8381 / A / b chip is internally integrated with 500V power switch. The working current of the chip is very low. Without auxiliary winding detection and power supply, only a few peripheral components are needed to achieve excellent constant current characteristics, which greatly saves the system cost and volume.
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[ CXLE8381/A/B ]"
目录
1.产品概述 2.产品特点 3.应用范围 4.技术规格书下载（产品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)
CXLE8381/A/B是一款高精度非隔离降压型LED恒流驱动芯片，可以通过外部引脚来选择分三段和四段作开关分段调光。芯片工作在电感电流临界连续和断续模式，适用于85Vac～265Vac全范围输入电压的非隔离降压型LED恒流电源。
当CXLE8381/A/B采用四段调光时，第一次开关上电输出电流时100%，第二次开关输出电流则变为50%，第三次开关输出电流变为25%，第四次开关则变为 12.5% 。如果芯片设置在三段调光则分别为100%，50%，12.5%。当开关关闭的时间超过 5S，再次加电时芯片就会重启到第一次上电100%输出电流状态。
CXLE8381/A/B芯片内部集成500V功率开关，芯片的工作电流极低，无需辅助绕组检测和供电，只需要很少的外围元件，即可实现优异的恒流特性，极大的节约了系统成本和体积。
CXLE8381/A/B芯片内带有高精度的电流采样电路，实现高精度的LED恒流输出和优异的线电压调整率，输出电流不随电感量和LED工作电压的变化而变化，实现优异的负载调整率。
CXLE8381/A/B 具有多重保护功能，包括 LED 开路/短路保护，ISEN 电阻短路保护，欠压保护，芯片温度过热调节等。
CXLE8381/A/B 采用 SOP-8/DIP-8 封装。
二.产品特点(Features)
四段、三段调光可通过外部管脚选择
内部集成500V 功率管
无需辅助绕组检测和供电
芯片超低工作电流
宽输入电压
LED开路保护
LED短路保护
ISEN电阻短路保护
芯片供电欠压保护
过热调节功能
三,应用范围 (Applications)
LED
四.技术规格书下载（产品PDF）
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)
|
引脚号 |
符号 |
功能 |
|
1 |
GND |
电源地 |
|
2 |
ROVP |
设置开路保护，外接电阻 |
|
3 |
SEL |
分段选择，悬空三段，接地四段 |
|
4 |
VDD |
工作电源 |
|
5/6 |
DRAIN |
功率 MOSFET 的漏端 |
|
7/8 |
ISEN |
电流采样端，接电阻到地 |
六.电路原理图
七,功能概述
|
项目 |
符号 |
参数范围 |
单位 |
|
VCC 引脚最大电源电流 |
ICC_MAX |
10 |
mA |
|
内部高压功率管漏极到源极峰值电压 |
VDRAIN |
-0.3～500 |
V |
|
电流采样端电压 |
VISEN |
-0.3～6 |
V |
|
开漏保护电压调节端 |
ROVP |
-0.3～6 |
V |
|
o |
Ptot |
0.45 @SOP-8 |
W |
|
0.90 @DIP-8 |
|||
|
热阻结-环境 |
|||
|
Rthj-a |
145 @SOP-8 |
℃/W |
|
|
80 @DIP-8 |
|||
|
工作结温范围 |
|||
|
TJ |
-40～150 |
℃ |
|
|
存储温度范围 |
TSTG |
-55～150 |
℃ |
|
ESD |
2,000 |
V |
八,相关芯片选择指南
|
非隔离产品 |
|||||
|
产品型号 |
功率因素校正 |
内置功率管 |
封装形式 |
功率范围 |
封装 |
|
MOSFET,500V/0.5A |
TO-94 |
<5W |
(TO-94)_CN |
||
|
MOSFET,500V0.8A |
TO-94 |
9W |
(TO-94)_CN |
||
|
MOSFET,500V/0.8A |
SOP-8 |
<9W |
（SOP-8)_CN |
||
|
MOSFET,500V/1A |
SOP-8,DIP-7 |
9-18W |
（SOP-8&DIP-7)_CN |
||
|
MOSFET,500V/2A |
SOP-8,DIP-7 |
Up to 36W |
（SOP-8&DIP-7)_CN |
||
|
MOSFET,500V/0.5A |
TO-94 |
<5W |
(TO-94)_CN |
||
|
MOSFET,500V0.8A |
TO-94 |
9W |
(TO-94)_CN |
||
|
MOSFET,500V/0.8A |
SOP-8 |
<9W |
（SOP-8)_CN |
||
|
MOSFET,500V/1A |
SOP-8,DIP-7 |
9-18W |
（SOP-8&DIP-7)_CN |
||
|
MOSFET,500V/2A |
SOP-8,DIP-7 |
Up to 36W |
（SOP-8&DIP-7)_CN |
||
|
√ |
MOSFET,600V/2.0A |
SOP-8,DIP-7 |
10-20W |
(SOP&DIP-7)_CN |
|
|
√ |
- |
SOT23-6 |
Up to 60W |
(SOT23-6)_CN |
|
|
MOSFET,500V/0.8A |
SOP-8 |
<9W |
(SOP-8)_CN |
||
|
MOSFET,500V/1A |
SOP-8,DIP-7 |
9-18W |
(SOP-8&DIP-7)_CN |
||
|
MOSFET,500V/2A |
SOP-8,DIP-7 |
Up to 36W |
(SOP-8&DIP-7)_CN |
||
