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RT9013-28GB Datasheet(PDF) 8 Page - Richtek Technology Corporation |
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RT9013-28GB Datasheet(HTML) 8 Page - Richtek Technology Corporation |
8 / 10 page RT9013A 8 DS9013A-02 April 2011 www.richtek.com Figure 2. Derating Curves for RT9013A Packages be calculated by following formula : PD(MAX) = ( TJ(MAX) − TA ) /θJA Where TJ(MAX) is the maximum operation junction temperature, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. For recommended operating conditions specification of RT9013A, where TJ(MAX) is the maximum junction temperature of the die (125 °C) and TA is the operated ambient temperature. The junction to ambient thermal resistance for SC-70-5/SC-82 package is 333 °C/W on the standard JEDEC 51-3 single-layer thermal test board. The maximum power dissipation at TA= 25 °C can be calculated by following formula : PD(MAX) = (125 °C − 25°C) / 333°C/W = 0.3W for SC-70-5/ SC-82 packages The maximum power dissipation depends on operating ambient temperature for fixed TJ(MAX) and thermal resistance θJA. For RT9013Apackages, the Figure 2 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0 12.5 25 37.5 50 62.5 75 87.5 100 113 125 Ambient Temperature ( °C) Single Layer PCB SC-70-5/SC-82 |
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