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LT1085MK-5 参数 Datasheet PDF下载

LT1085MK-5图片预览
型号: LT1085MK-5
PDF下载: 下载PDF文件 查看货源
内容描述: 3A,5A , 7.5A低压差正,固定式稳压器 [3A, 5A, 7.5A Low Dropout Positive Fixed Regulators]
分类和应用: 稳压器
文件页数/大小: 12 页 / 138 K
品牌: Linear Systems [ Linear Systems ]
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LT1083/LT1084/LT1085 Fixed  
W
BLOCK DIAGRA  
V
IN  
+
THERMAL  
LIMIT  
V
OUT  
GND  
LT1083/4/5 BD  
W U U  
U
APPLICATIO S I FOR ATIO  
TheLT1083familyofthree-terminalregulatorsareeasyto  
use and have all the protection features that are expected  
in high performance voltage regulators. They are short  
circuit protected, have safe area protection as well as  
thermal shutdown to turn off the regulator should the  
temperature exceed about 165°C.  
teristics are available. These capacitors differ in capacitor  
tolerance (sometimes ranging up to ±100%), equivalent  
series resistance, and capacitance temperature coeffi-  
cient. The 150μF or 22μF values given will ensure stability.  
Normally, capacitor values on the order of 100μF are used  
in the output of many regulators to ensure good transient  
responsewithheavyloadcurrentchanges. Outputcapaci-  
tance can be increased without limit and larger values of  
output capacitance further improve stability and transient  
response of the LT1083 regulators.  
These regulators offer lower dropout voltage and more  
precise reference tolerance. Further, the reference stabil-  
ity with temperature is improved over older types of  
regulators. The only circuit difference between using the  
LT1083 family and older regulators is that they require an  
output capacitor for stability.  
Another possible stability problem that can occur in  
monolithic IC regulators is current limit oscillations.  
These can occur because in current limit the safe area  
protection exhibits a negative impedance. The safe area  
protection decreases the current limit as the input-to-  
output voltage increases.That is the equivalent of having  
a negitive resistance since increasing voltage causes  
current to decrease. Negitive resistance during current  
limit is not unique to the LT1083 series and has been  
present on all power IC regulators. The value of negative  
Stability  
The circuit design used in the LT1083 family requires the  
use of an output capacitor as part of the device frequency  
compensation.Foralloperatingconditions,theadditionof  
150μF aluminum electrolytic or a 22μF solid tantalum on  
the output will ensure stability. Normally capacitors much  
smaller than this can be used with the LT1083. Many  
different types of capacitors with widely varying charac-  
resistance is a function of how fast the current limit is  
1083ffd  
7