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AMC7135SJFA Fiches technique(PDF) 4 Page - ADDtek Corp |
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AMC7135SJFA Fiches technique(HTML) 4 Page - ADDtek Corp |
4 / 6 page AMC7135 Copyright © 2007 ADDtek Corp. 4 DD031_C -- APRIL 2007 APPLICATION INFORMATION The Maximum Power Dissipation on Regulator: PD(MAX) = VOUT(MAX) × IOUT(NOM) + VIN(MAX) × IQ VOUT(MAX) = the maximum voltage on output pin; IOUT(NOM) = the nominal output current; IQ = the quiescent current the regulator consumes at IOUT(MAX); VIN(MAX) = the maximum input voltage. Thermal Consideration: The maximum junction temperature ratings of AMC7135 should not be exceeded under continuous normal load conditions. When power consumption is over about 700mW (SOT-89 package, at TA=70°C) or 1000mW (TO-252 package, at TA=70°C), additional heat sink is required to control the junction temperature below 120°C. The junction temperature is: TJ = PD (θJT +θCS +θSA ) + TA PD : Dissipated power. θJT: Thermal resistance from the junction to the mounting tab of the package. θCS: Thermal resistance through the interface between the IC and the surface on which it is mounted. (typically, θCS < 1.0°C /W) θSA: Thermal resistance from the mounting surface to ambient (thermal resistance of the heat sink). If PC Board copper is going to be used as a heat sink, below table can be used to determine the appropriate size of copper foil required. For multi-layered PCB, these layers can also be used as a heat sink. They can be connected with several through-hole vias. PCB θSA (°C /W) 59 45 38 33 27 24 21 PCB heat sink size (mm2) 500 1000 1500 2000 3000 4000 5000 |
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