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STK400-310 Arkusz danych(PDF) 7 Page - Sanyo Semicon Device |
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STK400-310 Arkusz danych(HTML) 7 Page - Sanyo Semicon Device |
7 / 10 page External Circuit Diagram Heat Radiation Design Considerations The radiator thermal resistance θc-a required for total substrate power dissipation Pd in the STK400-290 is determined as: Condition 1: IC substrate temperature Tc not to exceed 125°C. Pd × θc-a + Ta < 125°C ···························· (1) where Ta is the assured ambient temperature. 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 the thermal resistance per power transistor chip. However, power transistor power consumption is Pd equally divided by N units. Expressions (1) and (2) can be rewritten based on θc-a to yield: θc-a < (125–Ta)/Pd ····································(1)' θc-a < (150–Ta)/Pd–θj-c/N························(2)' The required radiator thermal resistance will satisfy both of these expressions. From expressions (1)' and (2)', the required radiator thermal resistance can be determined once the following specifications are known: • Supply voltage VCC • Load resistance RL • Assured ambient temperature Ta The total substrate power consumption when STK400-290 VCC is ±32 V and RL is 6 Ω, for a continuous sine wave signal, is a maximum of 105 W (Figure. 1). In general, when this sort of continuous signal is used for estimation of power consumption, the Pd used is 1/10th of PO max (slight variation depending on safety standard). Pd = 66.5 W (1/10 PO max=during 5 W) No. 4822-7/10 STK400-290 |
Podobny numer części - STK400-310 |
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Podobny opis - STK400-310 |
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