Datasheet > AL5809-15QP1-7

AL5809-15QP1-7

更新时间： 2022-02-26 10:21:15

品牌	Logo	应用领域
美台 - DIODES		驱动
页数	文件大小	规格书
12页	520K
描述
AUTOMOTIVE COMPLIANT 60V TWO TERMINAL CONSTANT CURRENT LED DRIVER

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AL5809-15QP1-7 数据手册

AL5809Q

Application Information (Continued)

Power Dissipation

The maximum ambient temperature range of the AL5809Q is determined by its power dissipation and thermal impedance of the PCB onto which

it is mounted. Its junction temperature must be kept equal to or less than +150°C.

The power dissipated is determined by the LED current version that has been selected (15, 20, 25 30, 40, 50, 60, 90, 100, 120 or 150mA) and

the difference between the input voltage and LED chain voltage.

V_INOUT* I_LED

In automotive applications the typical input voltage will be around 13V but can vary between 9V (without stop-start operation) and approximately

16V.

The recommended minimum V_INOUTvoltage of 2.5V enables the AL5809Q to drive 2 LED in series from the 9V battery voltage (assuming

V_LED<3.25V).

The AL5809Q’s power dissipation under these conditions will be:

V_INOUT* I_LED= 2.5 * I_LED

So for the 20mA AL5809-20QPI under these conditions this equals:

2.5V * 20mA = 50mW

Under maximum input conditions (16V) the AL5809Q’s power dissipation will be:

V_INOUT* I_LED= 9.5 * I_LED

So for the 20mA AL5809-20QPI this equals:

9.5V * 20mA = 190mW

So there is a large difference in power dissipation of the Linear LED driver between minimum and maximum battery voltages. And care must be

taken to calculate expected power dissipations and then determining the suitable PCB material and layout. See Figures 4 and 5 for graphs

showing power dissipation and maximum V_INOUT, for different currents and PCB material. Maximizing the area and mass of the ground plane

with additional vias between the pad of the Out Pin will improve the thermal impedance (_JA) of the AL5809Q.

Figure 4 Power Dissipation vs. Ambient Temperature

@ T_J= +150°C

Figure 5 Maximum V_INOUTvs. Ambient Temperature

@ T_J= +150°C

6 of 12

www.diodes.com

August 2017

AL5809Q

Document number: DS38233 Rev. 2 - 2

1...3 4 567 8 9...12

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型号	品牌	描述	获取价格	数据表
AL5809-15S1-7	DIODES	15-150mA 60V Constant Current Regulator	获取价格
AL5809-20P1-7	DIODES	LED Driver,	获取价格
AL5809-20QP1-7	DIODES	LED Driver,	获取价格
AL5809-20S1-7	DIODES	LED Driver,	获取价格
AL5809-25P1-7	DIODES	60V Two Terminal Constant Current LED Driver	获取价格
AL5809-25QP1-7	DIODES	AUTOMOTIVE COMPLIANT 60V TWO TERMINAL CONSTANT CURRENT LED DRIVER	获取价格