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STK433-040-E Datasheet(PDF) 7 Page - Sanyo Semicon Device |
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STK433-040-E Datasheet(HTML) 7 Page - Sanyo Semicon Device |
7 / 11 page STK433-040-E No. A1470-7/11 Evaluation Board Characteristics [Thermal Design Example for STK433-040-E (RL = 6Ω)] The thermal resistance, θc-a, of the heat sink for total power dissipation, Pd, within the hybrid IC is determined as follows. Condition 1: The hybrid IC substrate temperature, Tc, must not exceed 125 °C. Pd × θc-a + Ta < 125°C ................................................................................................. (1) Ta: Guaranteed ambient temperature for the end product Condition 2: The junction temperature, Tj, of each power transistor must not exceed 150 °C. Pd × θc-a + Pd/N × θj-c + Ta < 150°C .......................................................................... (2) N: Number of power transistors θj-c: Thermal resistance per power transistor However, the power dissipation, Pd, for the power transistors shall be allocated equally among the number of power transistors. The following inequalities result from solving equations (1) and (2) for θc-a. θc-a < (125 − Ta)/Pd ...................................................................................................... (1)' θc-a < (150 − Ta)/Pd − θj-c/N ........................................................................................ (2)' Values that satisfy these two inequalities at the same time represent the required heat sink thermal resistance. When the following specifications have been stipulated, the required heat sink thermal resistance can be determined from formulas (1)' and (2)' . • Supply voltage VCC • Load resistance RL • Guaranteed ambient temperature Ta PO - VCC Supply voltage, VCC - ±V Pd - PO Output power, PO/ch - W THD - PO PO - f Frequency, f - Hz Output power, PO/ch - W ITF02666 510 15 20 25 35 30 f= 1k Hz ,T HD =0 .4% ITF02665 0 1.0 0.1 70 50 60 40 30 20 10 0 70 50 60 40 30 20 10 0 70 50 60 40 30 20 10 23 5 7 23 5 7 10 23 5 7 100 ITF02664 0.001 1.0 0.1 0.01 7 5 3 2 7 5 3 2 7 5 3 2 7 5 3 2 7 5 3 2 0.1 1.0 100 10 23 5 7 23 5 7 10 23 5 7 100 VCC=±24V VG=30dB Rg=600 Ω Tc=25 °C RL=6Ω 2ch Drive VG=30dB Rg=600 Ω f=1kHz RL=6Ω Tc=25 °C 2ch Drive VCC=±24V VG=30dB f=1kHz Rg=600 Ω Tc=25 °C RL=6Ω 2ch Drive VCC=±24V VG=30dB Rg=600 Ω Tc=25 °C RL=6Ω 2ch Drive f=20kH z 1kHz ITF02667 1k 10 100 2 3 57 2 3 57 2 3 57 2 3 57 10k 100k THD=10% THD=0.4% |
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