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STK401-020 Fiches technique(PDF) 6 Page - Sanyo Semicon Device |
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STK401-020 Fiches technique(HTML) 6 Page - Sanyo Semicon Device |
6 / 8 page STK401-060 No. 4680—6/8 External Circuit Diagram Heatsink Design Considerations The heatsink thermal resistance, θc-a, required to dissipate the STK401-060 device total power dissipation, Pd, is determined as follows: Condition 1: IC substrate temperature not to exceed 125 °C. Pd × θc-a + Ta < 125°C ........................................ (1) where Ta is the guaranteed maximum ambient tempera- ture. Condition 2: Power transistor junction temperature, Tj, not to exceed 150 °C. Pd × θc-a + Pd/N × θj-c + Ta < 150°C ................. (2) where N is the number of power transistors and θj-c is the power transistor thermal resistance per transistor. Note that the power dissipated per transistor is the total, Pd, divided evenly among the N power transistors. Expressions (1) and (2) can be rewritten making θc-a the subject. θc-a < (125 − Ta)/Pd............................................. (1)′ θc-a < (150 − Ta)/Pd − θj-c/N .............................. (2)′ The heatsink required must have a thermal resistance that simultaneously satisfies both expressions. The heatsink thermal resistance can be determined from (1) ′ and (2)′ once the following parameters have been defined. • Supply voltage, VCC • Load resistance, RL • Guaranteed maximum ambient temperature, Ta The total device power dissipation when STK401-060 VCC = ±28V and RL = 6Ω, for a continuous sine wave sig- nal, is a maximum of 54W, as shown in Figure 1. When estimating the power dissipation for an actual audio signal input, the rule of thumb is to select Pd correspond- ing to 1/10 PO max (within safe limits) for a continuous sine wave input. For example, from Figure 1, Pd = 32.4W (for 1/10 PO max = 3.5W) The STK401-060 has 4 power transistors, and the thermal resistance per transistor, θj-c, is 1.8°C/W. If the guaran- teed maximum ambient temperature, Ta, is 50 °C, then the required heatsink thermal resistance, θc-a, is: From expression (1) ′: θc-a < (125 − 50)/32.4 < 2.31 From expression (2) ′: θc-a < (150 − 50)/32.4 − 1.8/4 < 2.63 Therefore, to satisfy both expressions, the required heat- sink must have a thermal resistance less than 2.31 °C/W. |
Numéro de pièce similaire - STK401-020 |
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Description similaire - STK401-020 |
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