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CAT4137

更新时间： 2024-02-09 17:00:04
品牌 Logo 应用领域
CATALYST 驱动器转换器升压转换器
页数 文件大小 规格书
14页 504K
描述
CMOS Boost Converter- White LED Driver

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中文翻译

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CAT4137 技术参数

是否无铅： 含铅是否Rohs认证： 不符合
生命周期：Obsolete零件包装代码：SOT-23
包装说明：1 MM HEIGHT, SOT-23, 5 PIN针数：5
Reach Compliance Code：not_compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.09
接口集成电路类型：LED DISPLAY DRIVERJESD-30 代码：R-PDSO-G5
JESD-609代码：e0长度：2.9 mm
湿度敏感等级：1复用显示功能：NO
功能数量：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
封装等效代码：TSOP5/6,.11,37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）：240
电源：3.6 V认证状态：Not Qualified
座面最大高度：1 mm子类别：Display Drivers
最大供电电压：5.5 V最小供电电压：2.2 V
标称供电电压：3.6 V表面贴装：YES
技术：CMOS温度等级：INDUSTRIAL
端子面层：TIN LEAD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：30宽度：1.625 mm
Base Number Matches：1

CAT4137 数据手册

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CAT4137  
APPLICATION INFORMATION  
External Component Selection  
Capacitors  
Schottky Diode  
The current rating of the Schottky diode  
must exceed the peak current flowing  
through it. The Schottky diode performance  
is rated in terms of its forward voltage at a  
given current. In order to achieve the best  
efficiency, this forward voltage should be as  
low as possible. The response time is also  
critical since the driver is operating at 1MHz.  
Central Semiconductor Schottky CMDSH2-3  
(200mA rated) or the CMDSH-3 (100mA  
The CAT4137 only requires small ceramic  
capacitors of 1uF on the input and 0.22µF on  
the output. Under normal condition, a 1µF  
input capacitor is sufficient. For applications  
with higher output power, a larger input  
capacitor of 2.2µF or 4.7µF may be  
appropriate. X5R and X7R capacitor types  
are ideal due to their stability across  
temperature range.  
rated)  
are  
recommended  
for  
most  
applications.  
Inductor  
LED Current Setting  
A 22µH inductor is recommended for most of  
the CAT4137 applications. In cases where  
the efficiency is critical, inductances with  
lower series resistance are preferred.  
Several inductor types from various vendors  
can be used. Figure 1 shows how different  
inductor types affect the efficiency across  
the load range.  
The LED current is set by the external  
resistor between the feedback pin (FB) and  
ground. The formula below gives the  
relationship between the resistor and the  
current:  
R1 = 0.3V/LED current  
LED current (mA)  
R1 (W)  
60  
100  
3 LEDs  
VIN = 3.6V  
5
10  
15  
20  
25  
30  
30  
20  
15  
12  
90  
80  
10  
SUMIDA CDRH3D16-220  
MURATA LQH32CN220  
PANASONIC ELJ-EA220  
Table 1. Resistor R1 and LED current  
70  
PANASONIC ELJ-PC220  
60  
5
10  
15  
20  
25  
30  
LED CURRENT [mA]  
Figure 1. Efficiency for various inductors  
© 2005 Catalyst Semiconductor, Inc.  
9 of 14  
Doc. 5012 , Rev. A  
Characteristics subject to change without notice  
1...6789101112...14

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