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BCR405U PDF预览

BCR405U

更新时间: 2024-02-28 14:42:20
品牌 Logo 应用领域
英飞凌 - INFINEON 显示驱动器驱动程序和接口二极管接口集成电路光电二极管
页数 文件大小 规格书
8页 198K
描述
Light Emitting Diode (LED) Driver IC Provides Constant LED Current Independent of Supply Voltage Variation

BCR405U 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Active零件包装代码:SOIC
包装说明:TSSOP, TSOP5/6,.11,37针数:6
Reach Compliance Code:compliantECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.66
接口集成电路类型:LED DISPLAY DRIVERJESD-30 代码:R-PDSO-G6
长度:2.9 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:6
封装主体材料:PLASTIC/EPOXY封装代码:TSSOP
封装等效代码:TSOP5/6,.11,37封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, THIN PROFILE, SHRINK PITCH峰值回流温度(摄氏度):NOT SPECIFIED
电源:10 V认证状态:Not Qualified
筛选级别:AEC-Q100座面最大高度:1.1 mm
子类别:Display Drivers标称供电电压:10 V
表面贴装:YES技术:BIPOLAR
端子形式:GULL WING端子节距:0.95 mm
端子位置:DUAL处于峰值回流温度下的最长时间:NOT SPECIFIED
宽度:1.6 mmBase Number Matches:1

BCR405U 数据手册

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Applications Note No. 066  
Silicon Discretes  
BCR402R: Light Emitting Diode (LED) Driver IC Provides  
Constant LED Current Independent of Supply Voltage Variation  
Supplies stable bias current for Light Emitting Diodes (LEDs)  
Low Voltage Drop of 0.75V maximizes system DC efficiency  
LED drive current adjustable via single external resistor (20 – 60 mA range)  
Negative temperature coefficient protects LEDs against thermal runaway  
Low Cost, Low External Parts Count, Easy-to-Use, Fast Time-To-Market  
Small Surface-Mount SOT143R packaging (2.9 x 1.6 x 1.1 mm inc. leads)  
1. Introduction  
Infineon’s LED driver family, consisting of  
the BCR401R, BCR402R, BCR402U and  
BCR405U, offers an easy, cost-effective and  
reliable way to achieve LED current stabilization  
while overcoming the drawbacks inherent in  
using a series resistor. These LED driver IC’s  
cover the most commonly used LED supply  
current ranges – 10mA, 20mA, and 50mA.  
Refer to Figures 1 and 2. In each device, the  
nominal drive current may be easily adjusted  
upward from the nominal value by adding a  
single external resistor – for BCR401R / 402R,  
connect this resistor between pins 3 and 4.  
Light-Emitting Diodes (LEDs) and LED displays  
suffer from varying illumination levels as a result  
of changes in power supply voltages. This is  
true for displays used in automotive applications,  
battery-operated handheld devices, or fixed  
(architectural) installations.  
To keep LED  
brightness constant, it is necessary to stabilize  
the LED’s current over the anticipated power  
supply voltage variation range.  
Often a resistor in series with the LED(s) is used  
to stabilize current. However, this method has  
some serious drawbacks. To achieve good LED  
current stability over the varying supply voltage  
range, the resistor must take on a large value  
(infinite resistance, in the ideal case) to make  
the power supply plus series resistor  
combination approach the traits of an ideal  
constant current source having infinite output  
impedance. In such cases, there is a large  
voltage drop across this series resistor. For a  
particular supply voltage, this voltage drop 1)  
reduces the number of LEDs that can be driven  
by one resistor, requiring additional parallel  
resistors with which to drive a given number of  
LEDs, thereby increasing system current  
consumption and 2) power is “burned” or wasted  
as heat in these series resistors.  
Figure 1. Infineon LED Current Driver Family  
Recommended Current Ranges.  
Maximum  
Device  
Package Recommended  
Power  
Current Range Dissipation  
BCR401R SOT143R 10 – 60 mA  
BCR402R SOT143R 20 – 60 mA  
330 mW *  
330 mW *  
BCR402U SC74  
BCR405U SC74  
20 – 65 mA  
50 – 65 mA  
500 mW **  
500 mW **  
*
Soldering Point Temperature TS = 87 °C  
** Soldering Point Temperature TS = 117 °C  
For selecting the proper resistor value to  
increase BCR402 drive current above the  
nominal level of 20mA, refer to Figure 3, which  
AN 066 Rev D  
1 / 8  
16-Jan-2004  

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