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LM7915CT Datasheet(PDF) 4 Page - Texas Instruments |
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LM7915CT Datasheet(HTML) 4 Page - Texas Instruments |
4 / 13 page 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 (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, (2.2 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 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM7905 LM7912 LM7915 |
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