5秒后页面跳转
AD8240 PDF预览

AD8240

更新时间: 2024-02-22 09:06:12
品牌 Logo 应用领域
亚德诺 - ADI 驱动器监控
页数 文件大小 规格书
12页 258K
描述
LED Driver/Monitor

AD8240 技术参数

是否无铅: 含铅是否Rohs认证: 不符合
生命周期:Active零件包装代码:TSSOP
包装说明:MO-187AA, MSOP-8针数:8
Reach Compliance Code:not_compliantECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.05
接口集成电路类型:LED DISPLAY DRIVERJESD-30 代码:S-PDSO-G8
JESD-609代码:e0长度:3 mm
湿度敏感等级:1复用显示功能:NO
功能数量:1区段数:1
端子数量:8最高工作温度:125 °C
最低工作温度:-40 °C封装主体材料:PLASTIC/EPOXY
封装代码:TSSOP封装形状:SQUARE
封装形式:SMALL OUTLINE, THIN PROFILE, SHRINK PITCH峰值回流温度(摄氏度):240
认证状态:Not Qualified座面最大高度:1.1 mm
最大供电电压:27 V最小供电电压:9 V
标称供电电压:13.5 V表面贴装:YES
温度等级:AUTOMOTIVE端子面层:Tin/Lead (Sn/Pb)
端子形式:GULL WING端子节距:0.65 mm
端子位置:DUAL处于峰值回流温度下的最长时间:NOT SPECIFIED
宽度:3 mmBase Number Matches:1

AD8240 数据手册

 浏览型号AD8240的Datasheet PDF文件第2页浏览型号AD8240的Datasheet PDF文件第3页浏览型号AD8240的Datasheet PDF文件第4页浏览型号AD8240的Datasheet PDF文件第5页浏览型号AD8240的Datasheet PDF文件第6页浏览型号AD8240的Datasheet PDF文件第7页 
LED Driver/Monitor  
AD8240  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
PWM input for LED brightness control  
Open LED detection  
VO  
8
SHUNT BASE  
5
6
7
Latch-off overcurrent protection  
Constant voltage regulated output  
Supply range: 9 V to 27 V  
RSENSE  
10k  
VSENSE  
1
Regulated voltage range: 12.5 V to 27 V  
Operating current: 300 µA  
Shutdown current: 10 µA  
Temperature range −40°C to +125°C  
8-lead MSOP package  
5V  
2
3
R1  
350k  
REFERENCE  
LATCH-OFF  
DRIVER  
PWM  
R2  
250k  
AD8240  
GENERAL DESCRIPTION  
4
GND  
The AD8240 LED driver/monitor, in combination with an  
external transistor, supplies a constant 12 V to drive LED  
lamps. This allows cost-effective LED lamp monitoring and  
short-circuit protection. The output is regulated at 12 V when  
the supply voltage is between 12.5 V and 27 V.  
Figure 1.  
PRODUCT HIGHLIGHTS  
1. Partial LED lamp failure detection.  
Allows for compliance with automotive regulations  
for turn signal functionality detection and minimum  
brightness, as well as running/brake light minimum  
brightness compliance.  
A CMOS compatible, level-dependent, digital input can be used  
for PWM control of the LED brightness. VO is turned on when  
the PWM input is high and turned off when the input is low.  
The AD8240 is designed to work with a PWM frequency up  
to 500 Hz, and a typical PWM range from 5% to 95%.  
2. Current limiting/latch-off protection.  
Limiting and latching off the LED current protects vehicle  
wiring and prevents lamp damage  
Open LED detection is accomplished by measuring the change  
in LED lamp current caused by an open LED(s) through the use  
of an internal high-side current-sense amplifier that amplifies  
the voltage across an external current shunt. The voltage across  
the shunt resistor is amplified to a level that can be measured by  
a microcontroller A/D converter or a comparator. The ability to  
measure the change in LED lamp current is the key benefit of  
constant-voltage LED lamp driving.  
3. PWM input.  
Provides brightness control.  
4. Constant voltage output.  
Saves cost by minimizing wiring and system design  
complexity.  
5. Drives an external transistor for low power operation.  
Providing for an external power transistor allows the  
AD8240 to be a low cost solution in a small package. A  
more efficient design is made possible when the system  
designer can select a power device with specifications  
that match the application requirements.  
The output is current-limited by latching off the output voltage  
when the current reaches a preset level. The current limit is set  
by selecting the value of the external current shunt that causes  
the output of the sense amplifier to slightly exceed the 5 V  
reference level when the current exceeds a maximum level.  
When the sense amplifier output exceeds 5 V, it trips an internal  
comparator that causes the driver to latch off the output voltage.  
The latch is reset during the next PWM cycle. The overcurrent  
condition can also be detected by a microcontroller or external  
comparator by measuring the sense amplifier output.  
6. Linear regulation.  
Minimizes EMI, which allows faster system integration,  
qualification, and time to market. Additionally, costs are  
reduced by eliminating the inductor required for a  
switching design. Because of the power-saving nature of  
LED lamps as compared to incandescent lamps, a  
switching driver is typically not required.  
Rev. 0  
Information furnished by Analog Devices is believed to be accurate and reliable.  
However, no responsibility is assumed by Analog Devices for its use, nor for any  
infringements of patents or other rights of third parties that may result from its use.  
Specifications subject to change without notice. No license is granted by implication  
or otherwise under any patent or patent rights of Analog Devices. Trademarks and  
registered trademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.326.8703  
www.analog.com  
© 2004 Analog Devices, Inc. All rights reserved.  

与AD8240相关器件

型号 品牌 描述 获取价格 数据表
AD8240YRM ADI LED Driver/Monitor

获取价格

AD8240YRM-REEL ADI LED Driver/Monitor

获取价格

AD8240YRM-REEL7 ADI LED Driver/Monitor

获取价格

AD8240YRMZ ADI LED Driver/Monitor

获取价格

AD8240YRMZ-R7 ADI LED Driver/Monitor

获取价格

AD8240YRMZ-REEL ADI LED DISPLAY DRIVER, PDSO8, MO-187AA, MSOP-8

获取价格