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CAT37TDI-GT3

更新时间： 2024-02-11 12:07:29
品牌 Logo 应用领域
安森美 - ONSEMI 驱动器转换器升压转换器
页数 文件大小 规格书
13页 181K
描述
CMOS White LED Driver Boost Converter

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CAT37TDI-GT3 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：TSOT包装说明：VSSOP,
针数：5Reach Compliance Code：unknown
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.04接口集成电路类型：LED DISPLAY DRIVER
JESD-30 代码：R-PDSO-G5JESD-609代码：e4
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：5
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：VSSOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：1 mm最大供电电压：7 V
最小供电电压：2.5 V标称供电电压：3 V
表面贴装：YES技术：CMOS
温度等级：INDUSTRIAL端子面层：NICKEL PALLADIUM GOLD
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：40
宽度：1.6 mmBase Number Matches：1

CAT37TDI-GT3 数据手册

 浏览型号CAT37TDI-GT3的Datasheet PDF文件第4页浏览型号CAT37TDI-GT3的Datasheet PDF文件第5页浏览型号CAT37TDI-GT3的Datasheet PDF文件第6页浏览型号CAT37TDI-GT3的Datasheet PDF文件第8页浏览型号CAT37TDI-GT3的Datasheet PDF文件第9页浏览型号CAT37TDI-GT3的Datasheet PDF文件第10页 
CAT37  
APPLICATION INFORMATION  
CAPACITOR SELECTION  
Table 2: Schottky Diode Suppliers  
Low ESR (equivalent series resistance) capacitors  
should be used at the output to minimize the output  
ripple voltage. The low ESR and small package  
options available with multilayer ceramic capacitors  
make them excellent choices. The X5R and X7R  
capacitor types are preferred because they retain their  
capacitance over wider voltage and temperature  
ranges than the Y5V or Z5U types. A 1.0µF output  
capacitor is recommended for most applications.  
Part  
Supplier  
MBR0520  
MBR0530  
MBR0540  
ON Semiconductor  
www.onsemi.com  
800.282.9855  
LED CURRENT PROGRAMMING  
The LED current is programmed with a single resistor  
connected to the FB pin. The FB pin is internally  
regulated to 95 mV, which sets the current flowing  
through R1 and the LEDs as equal to 0.095/R1. For  
the best accuracy, a 1% or better resistor is  
recommended. Table 3 shows several typical 1% R1  
values.  
The voltage rating of the output capacitor C2 depends  
on the number of LEDs driven in the series. A 16V  
ceramic capacitor is recommended when driving 3 or  
4 LEDs.  
Low profile ceramic capacitors with a 1mm maximum  
height/thickness are available for designs height  
requirements. Ceramic capacitors also make a good  
choice for the input capacitor, which should be  
mounted as close as possible to the CAT37. A 1µF or  
4.7µF input capacitor is recommended. Table 1 shows  
a list of several ceramic capacitor manufacturers.  
Consult the manufacturers for detailed information as  
new products and package options are introduced  
regularly.  
Table 4: R1 Resistor Values  
ILED (mA)  
R1 (Ω)  
2.37  
3.16  
4.75  
6.34  
7.87  
9.53  
19.1  
40  
30  
20  
15  
12  
10  
5
Table 1: Ceramic Capacitor Manufacturers  
Supplier  
Taiyo Yuden  
Murata  
Web  
For other LED current values, use the following  
equation to choose R1.  
www.t-yuden.com  
www.murata.com  
www.kemet.com  
www.avxcorp.com  
0.095  
R1=  
Kemet  
ILED  
AVX  
Most white LEDs are driven at maximum currents of  
15mA to 20mA. Some higher power designs will use  
two parallel strings of LEDs for greater light output,  
resulting in 30mA to 40mA (two strings of 15mA to  
20mA) flowing through the R1 resistor.  
DIODE SELECTION  
Schottky diodes, with their low forward voltage drop  
and fast switching speed, are the ideal choice for high  
efficiency applications. Table  
different Schottky diodes that work well with the  
CAT37. Make sure that the diode has a voltage rating  
greater than the output voltage. The diode conducts  
current only when the power switch is turned off  
(typically less than one-third the time), so a 0.4A or  
0.5A diode will be sufficient for most designs.  
2
shows several  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
7
Doc. No. MD-5005 Rev. V  
1...45678910...13

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