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LM7905CT 参数 Datasheet PDF下载

LM7905CT图片预览
型号: LM7905CT
PDF下载: 下载PDF文件 查看货源
内容描述: LM79XX系列三端稳压器的负 [LM79XX Series 3-Terminal Negative Regulators]
分类和应用: 三端稳压器
文件页数/大小: 13 页 / 1183 K
品牌: TI [ TEXAS INSTRUMENTS ]
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LM7905, LM7912, LM7915  
SNOSBQ7C JUNE 1999REVISED MAY 2013  
www.ti.com  
DESIGN CONSIDERATIONS  
The LM79XX fixed voltage regulator series has thermal overload protection from excessive power dissipation,  
internal short circuit protection which limits the circuit's maximum current, and output transistor safe-area  
compensation for reducing the output current as the voltage across the pass transistor is increased.  
Although the internal power dissipation is limited, the junction temperature must be kept below the maximum  
specified temperature (125°C) in order to meet data sheet specifications. To calculate the maximum junction  
temperature or heat sink required, the following thermal resistance values should be used:  
Typ  
θJC  
Max  
θJC  
Typ  
θJA  
Max  
θJA  
Package  
°C/W  
3.0  
°C/W  
5.0  
°C/W  
60  
°C/W  
40  
TO-220  
(1)  
Solving for TJ:  
TJ = TA + PD (θJC + θCA  
)
or  
= TA + PDθJA (without heat sink)  
where  
TJ = Junction Temperature  
TA = Ambient Temperature  
PD = Power Dissipation  
θJA = Junction-to-Ambient Thermal Resistance  
θJC = Junction-to-Case Thermal Resistance  
θCA = Case-to-Ambient Thermal Resistance  
θCS = Case-to-Heat Sink Thermal Resistance  
θSA = Heat Sink-to-Ambient Thermal Resistance  
Typical Applications  
Bypass capacitors are necessary for stable operation of the LM79XX series of regulators over the input voltage  
and output current ranges. Output bypass capacitors will improve the transient response by the regulator.  
The bypass capacitors, (2.2μF on the input, 1.0μF on the output) should be ceramic or solid tantalum which have  
good high frequency characteristics. If aluminum electrolytics are used, their values should be 10μF or larger.  
The bypass capacitors should be mounted with the shortest leads, and if possible, directly across the regulator  
terminals.  
4
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Copyright © 1999–2013, Texas Instruments Incorporated  
Product Folder Links: LM7905 LM7912 LM7915