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SA7454 Datasheet(PDF) 4 Page - Silan Microelectronics Joint-stock |
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SA7454 Datasheet(HTML) 4 Page - Silan Microelectronics Joint-stock |
4 / 5 page SA7454 than: (150 °C-50°C)/6W=16.7°C/W For HSIP-9 package, the die-to-package thermal resistance is Rth(j-c) = 8 °C/W,then the package-to-ambient thermal resistance should be lower than 8.7 °C/W. So we need heat sink to reduce the package-to-ambient thermal resistance. For DIP-18IH-300-2.54 package, the die-to-package thermal resistance is Rth(j-c) = 15 °C/W , then the package-to-ambient thermal resistance should be lower than 1.7 °C/W,that will make heat sinking difficult, in addition, DIP-18IH-300-2.54 can not add effective heat sink, so we need to reduce the power dissipation by reducing load. For example, with a 8 Ω load, it can develop up to 3W of internal power dissipation, and the package-to-ambient thermal resistance should be lower than: (150 °C-50°C)/3W-15°C/W=18.3°C /W The thermal requirements can become more difficult when SA7454 is driving a reactive load. As a general rule, the power dissipation of an amplifier driving a 60º reactive load (usually considered to be a worst-case loudspeaker load) will be roughly that of the same amplifier driving the resistive part of that load. For example, a loudspeaker may at some frequency have an impedance with a magnitude of 8 Ω and a phase angle of 60º. The real part of this load will then be 4 Ω, and the amplifier power dissipation equal to the power dissipation with a 4Ω load. TYPICAL APPLICATION CIRCUIT HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.0 2008.10.21 Http://www.silan.com.cn Page 4 of 5 |
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