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A6279ELW-T

更新时间： 2024-02-07 06:52:08
品牌 Logo 应用领域
急速微 - ALLEGRO 显示驱动器驱动程序和接口接口集成电路光电二极管信息通信管理
页数 文件大小 规格书
18页 621K
描述
Serial-Input Constant-Current Latched LED Drivers with Open LED Detection

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A6279ELW-T 技术参数

是否Rohs认证： 符合生命周期：Obsolete
零件包装代码：SOIC包装说明：SOP, SOP24,.4
针数：24Reach Compliance Code：unknown
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.82Is Samacsys：N
数据输入模式：SERIAL显示模式：DOT MATRIX
接口集成电路类型：LED DISPLAY DRIVERJESD-30 代码：R-PDSO-G24
JESD-609代码：e3长度：15.4 mm
湿度敏感等级：3复用显示功能：NO
功能数量：1区段数：16
端子数量：24最高工作温度：85 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装等效代码：SOP24,.4
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：260电源：3.3/5 V
认证状态：Not Qualified座面最大高度：2.65 mm
子类别：Display Drivers最大供电电压：5.5 V
最小供电电压：3 V标称供电电压：5 V
表面贴装：YES技术：BICMOS
温度等级：INDUSTRIAL端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：40
宽度：7.5 mmBase Number Matches：1

A6279ELW-T 数据手册

 浏览型号A6279ELW-T的Datasheet PDF文件第7页浏览型号A6279ELW-T的Datasheet PDF文件第8页浏览型号A6279ELW-T的Datasheet PDF文件第9页浏览型号A6279ELW-T的Datasheet PDF文件第11页浏览型号A6279ELW-T的Datasheet PDF文件第12页浏览型号A6279ELW-T的Datasheet PDF文件第13页 
A6278 and  
A6279  
Serial-Input, Constant-Current Latched  
LED Drivers with Open LED Detection  
Application Information  
Load Supply Voltage (VLED  
)
Pattern Layout  
These devices are designed to operate with driver voltage  
drops (VCE) of 0.7 to 3V, with an LED forward voltage, VF , of  
1.2 to 4.0 V. If higher voltages are dropped across the driver,  
package power dissipation will increase significantly. To mini-  
mize package power dissipation, it is recommended to use the  
lowest possible load supply voltage, VLED, or to set any series  
voltage dropping, VDROP, according to the following formula:  
This device has a common logic ground and power ground  
terminal, GND. For the LP package, the GND pin should be tied  
to the exposed metal pad, EP, allowing the ground plane copper  
to be used to dissipate heat. If the ground pattern layout contains  
large common mode resistance, and the voltage between the  
system ground and the LATCH ENABLE, OUTPUT ENABLE,  
or CLOCK terminals exceeds 2.5 V (because of switching noise),  
these devices may not work properly.  
VDROP = VLED – VF – VCE,  
Package Power Dissipation (PD)  
The maximum allowable package power dissipation based on  
package type is determined by:  
with VDROP = IO×RDROP for a single driver or for a Zener diode  
(VZ), or for a series string of diodes (approximately 0.7 V per  
diode) for a group of drivers (see figure 3). If the available volt-  
age source, VLED, will cause unacceptable power dissipation and  
series resistors or diodes are undesirable, a voltage regulator can  
be used to provide supply voltages.  
PD(max) = (150 – TA) / RθJA  
,
where RθJA is the thermal resistance of the package, determined  
experimentally. Power dissipation levels based on the package  
are shown in the Package Thermal Characteristics section (see  
page 14).  
For reference, typical LED forward voltages are:  
The actual package power dissipation is determined by:  
PD(act) = DC ×(VCE ×IO×16) + (VDD×IDD),  
LED Type  
White  
VF (V)  
3.5 to 4.0  
3.0 to 4.0  
where DC is the duty cycle. The value 16 represents the maxi-  
mum number of available device outputs for the A6279, used for  
the worst-case scenario (displaying all 16 LEDs; this would be 8  
for the A6278).  
Blue  
Green  
Yellow  
Amber  
Red  
1.8 to 2.2  
2.0 to 2.1  
1.9 to 2.65  
1.6 to 2.25  
1.2 to 1.5  
When the load suppy voltage, VLED, is greater than 3 to 5 V, and  
PD(act) > PD(max), an external voltage reducer (VDROP) must be  
used (see figure 3).  
Infrared  
Reducing the percent duty cycle, DC, will also reduce power dis-  
sipation. Typical results are shown on the following pages.  
V
V
V
LED  
LED  
LED  
V
V
V
DROP  
DROP  
DROP  
V
F
V
F
V
F
V
V
V
CE  
CE  
CE  
Figure 3. Typical appplications for voltage drops  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff, Box 15036  
10  
Worcester, Massachusetts 01615-0036 (508) 853-5000  
www.allegromicro.com  
1...78910111213...18

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