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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TS4956 датащи(PDF) 39 Page - STMicroelectronics |
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TS4956 датащи(HTML) 39 Page - STMicroelectronics |
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39 / 51 page  TS4956 Application information 39/51 The efficiency is the ratio between the output power and the power supply: The maximum theoretical value is reached when VPEAK = VCC/2, so The TS4956 has in modes 3 and 4 two active output power amplifiers. Each amplifier produces heat due to its power dissipation. Therefore the maximum die temperature is the sum of each amplifier’s maximum power dissipation. It is calculated as follows: Pdiss 1 = power dissipation due to the first power amplifier. Pdiss 2 = power dissipation due to the second power amplifier. Total Pdiss =Pdiss 1 +Pdiss 2 (W) In most cases, Pdiss 1 =Pdiss 2, giving: 4.3.3 BTL output configuration (modes 1, 2, 7): The average current delivered by the supply voltage is: Figure 128. Current delivered by supply voltage in the BTL output configuration The power delivered by supply voltage is: Then, the power dissipation by each amplifier is η P out P su pply ------------------- πV PEAK 4V CC --------------------- == η π 8 --- 39.25% == TotalP diss 2P diss1 = TotalP diss 42VCC π R L ---------------------- P out 2P ou t W () – = Icc AVG 1 π --- V PEAK R L ----------------- t () sin t d 0 π ∫ 2V PEAK πR L ---------------------A () == P sup ply V CCICC AV G W () = P diss 22 VCC π R L ---------------------- P ou t P out W () – = |
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