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A6262KLYTR-T

更新时间： 2024-02-26 07:41:10
品牌 Logo 应用领域
急速微 - ALLEGRO 调节器二极管驱动
页数 文件大小 规格书
15页 359K
描述
The A6262 is a linear, programmable current regulator providing up to 100 mA from each of four outputs to drive arrays of high brightness LEDs.

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A6262KLYTR-T 技术参数

是否Rohs认证： 符合生命周期：Active
包装说明：,Reach Compliance Code：compliant
风险等级：5.66接口集成电路类型：LED DISPLAY DRIVER
JESD-609代码：e3湿度敏感等级：2
端子面层：Matte Tin (Sn)Base Number Matches：1

A6262KLYTR-T 数据手册

 浏览型号A6262KLYTR-T的Datasheet PDF文件第4页浏览型号A6262KLYTR-T的Datasheet PDF文件第5页浏览型号A6262KLYTR-T的Datasheet PDF文件第6页浏览型号A6262KLYTR-T的Datasheet PDF文件第8页浏览型号A6262KLYTR-T的Datasheet PDF文件第9页浏览型号A6262KLYTR-T的Datasheet PDF文件第10页 
A6262  
Automotive LED Array Driver  
As the junction temperature of the A6262 increases, the regulated  
current level is reduced, reducing the dissipated power in the  
A6262 and in the LEDs. The current is reduced from the 100%  
level at typically 4% per degree Celsius until the point at which  
the current drops to 25% of the full value, defined at TJL. Above  
this temperature the current will continue to reduce at a lower  
rate until the temperature reaches the overtemperature shutdown  
threshold temperature, TJF.  
100  
90  
80  
60  
40  
TJM  
The temperature at which the current reduction begins can be  
adjusted by changing the voltage on the THTH pin. When THTH  
is left open the temperature at which the current reduction begins  
is defined as the thermal monitor activation temperature, TJM, and  
is specified, in the characteristics table, at the 90% current level.  
25  
20  
TJF  
TJL  
0
70  
90  
110  
130  
150  
170  
Junction Temperature, TJ (°C)  
TJM will increase as the voltage at the THTH pin, VTHTH , is  
reduced and is defined as approximately:  
Figure 2. Temperature monitor current reduction.  
1.46 –VTHTH  
TJM  
(°C)  
(3)  
=
0.0039  
A resistor connected between THTH and GND will reduce VTHTII  
and increase TJM. A resistor connected between THTH and a refer-  
ence supply greater than 1 V will increase VTHTH and reduce TJM  
.
1.3  
1.2  
1.1  
1.0  
0.9  
0.8  
250  
200  
Figure 3 shows how the nominal value of the thermal monitor  
activation temperature varies with the voltage at THTH and with  
either a pull-down resistor, RTH, to GND or with a pull-up resis-  
tor, RTH, to 3 V and to 5 V.  
R
pull-up  
to 5 V  
TH  
150  
100  
50  
R
pull-down  
TH  
In extreme cases, if the chip temperature exceeds the overtem-  
perature limit, TJF, all regulators will be disabled. The tempera-  
ture will continue to be monitored and the regulators re-activated  
when the temperature drops below the threshold provided by the  
specified hysteresis.  
to GND  
V
THTH  
R
pull-up  
TH  
to 3 V  
Note that it is possible for the A6262 to transition rapidly  
between thermal shutdown and normal operation. This can hap-  
pen if the thermal mass attached to the exposed thermal pad is  
small and TJM is increased to close to the shutdown temperature.  
The period of oscillation will depend on TJM, the dissipated  
power, the thermal mass of any heatsink present, and the ambient  
temperature.  
0
70  
80  
90  
100  
110  
120  
130  
140  
150  
Thermal Monitor Activation Temperature, T (°C)  
JM  
Figure 3. TJM versus a pull-up or pull-down resistor, RTH, and VTHTH  
.
Allegro MicroSystems, Inc.  
115 Northeast Cutoff  
7
Worcester, Massachusetts 01615-0036 U.S.A.  
1.508.853.5000; www.allegromicro.com  
1...45678910...15

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