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LM7915CT Datasheet(PDF) 4 Page - Texas Instruments

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Part # LM7915CT
Description  LM79XX Series 3-Terminal Negative Regulators
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM7915CT Datasheet(HTML) 4 Page - Texas Instruments

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LM7905, LM7912, LM7915
SNOSBQ7C – JUNE 1999 – REVISED 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
Max
Typ
Max
Package
θJC
θJC
θJA
θJA
°C/W
°C/W
°C/W
°C/W
TO-220
3.0
5.0
60
40
(1)
Solving for TJ:
TJ = TA + PD JC + 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, (2.2
μF 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 10
μF 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


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