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A1084DVR-50 参数 Datasheet PDF下载

A1084DVR-50图片预览
型号: A1084DVR-50
PDF下载: 下载PDF文件 查看货源
内容描述: [5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR]
分类和应用:
文件页数/大小: 12 页 / 555 K
品牌: AITSEMI [ AiT Semiconductor ]
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A1084  
AiT Semiconductor Inc.  
www.ait-ic.com  
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR  
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS  
DETAILED INFORMATION  
A1084 is a series of low dropout voltage, three terminal regulators which application circuit of fixed version  
only needs two capacitors and the adjustable version only needs two resistors and two capacitors to work. It  
is composed of some modules including start-up circuit, bias circuit, band-gap, thermal shutdown, current limit,  
power transistors and its driver circuit and so on.  
Thermal Shutdown and Current Limit  
The A1084 thermal shutdown and current limit modules can assure chip and its application system working  
safety when the environment temperature is larger than 80oC or output current is larger than 5.2A.  
Stable Reference Output Voltage  
The band-gap module provides stable reference voltage, whose temperature coefficient is compensated by  
careful design considerations. The temperature coefficient is under 100ppm/oC. And the accuracy of  
output voltage is guaranteed by trimming technique.  
Application Hints (See Schematic 1)  
1. Recommend using 10uF Tan capacitor (CIN) as bypass capacitor for all application circuit.  
2. Recommend using 22uF Tan capacitor (COUT) to assure circuit stability.  
3. Using a bypass capacitor (CADJ) between the adjust terminal and ground can improve ripple rejection, this  
bypass capacitor prevents ripple from being amplified as the output voltage is increase. The impedance  
of CADJ should be less than the resistor’s (R1) which is between output and adjust pins to prevent ripple  
from being amplified at any ripple frequency. As R1 is normally in the range of 120Ω ~ 200Ω, the value of  
CADJ should satisfy this equation: 1 / (2πx FRIPPLE x CADJ) < R1. Recommend using 10uF Tan capacitor.  
Output Voltage of Adjustable Version  
The A1084 adjustable version provides 1.25V reference voltage. Any output voltage between 1.25V ~ 10V  
can be available by choosing two external resistors (connection method is shown in Schematic 1), R1 and R2  
are the two external resistors.  
REV1.2  
- JUN 2007 RELEASED – SEP 2008 REVISED -  
- 7 -