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LM1084RS Datasheet(PDF) 7 Page - HTC Korea TAEJIN Technology Co. |
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LM1084RS Datasheet(HTML) 7 Page - HTC Korea TAEJIN Technology Co. |
7 / 7 page 5A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed) LM1084 THERMAL CONSIDERATIONS The LM1084 series have internal power and thermal limiting circuitry designed to protect the device under overload cinditions. However maximum junction temperature ratings should not be exceeded under continous normal load conditions. Careful consideration must be given to all sourses of thermal resistance from junction to ambient, including junction-to- ase, case-to-heat sink interface and heat sink resistance itself. To ensure safe operating temperatures and reflect more accurately the device temperature, new thermal resistance specifications have been developed. Unlike order reguators with a single junction-to-case thermal resistance speccification, the data section for these new regulators provides a separate thermal resistance and maximum juntion temperature for both the Control Section and the Power Transistor. Calculations for both temperatures under certain conditions of ambient temperature and heat sink resistance and to ensure that both thermal limits are met. Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. This is the lowest resistance path for the heat flow. In order to ensure the best possible thermal flow from this area of the package to the heat sink proper mounting is required. Thermal compound at the case- to-heat sink interface is recommended. A thermarlly conductive spacer can be used, if the case of the device must be electrically isolated, but its added contribution to thermal resistance has to be considered. HTC - 7 - |
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