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SA7267A Datasheet(PDF) 5 Page - Silan Microelectronics Joint-stock |
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SA7267A Datasheet(HTML) 5 Page - Silan Microelectronics Joint-stock |
5 / 10 page SA7267 HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.1 2006.05.25 Http: www.silan.com.cn Page 5 of 11 This is a rather large heat sink and may not be practical in some applications. If a smaller heat sink is required for reasons of size or cost, the heat sink can be isolated from the chassis so the mica washer is not needed. This will change the required heat sink to a 1.1 °C /W unit if the case-to-heat-sink interface is lubricated. The thermal requirements can become more difficult when an amplifier is driving a reactive load. For a given magnitude of load impedance, a higher degree of reactance will cause a higher level of power dissipation within the amplifier. 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 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 will roughly follow the curve of power dissipation with a 4 Ω resistor. TYPICAL APPLICATION CIRCUIT IN SPLIT SUPPLY Note: Figures for the SA7267. |
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