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STK673-011-E Arkusz danych(PDF) 8 Page - Sanyo Semicon Device |
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STK673-011-E Arkusz danych(HTML) 8 Page - Sanyo Semicon Device |
8 / 15 page STK673-011-E No.A1137-8/15 (3) Heat Radiation Design Heat radiation design for reducing the operation substrate temperature of the hybrid IC is effective in enhancing the quality of the hybrid IC. The size of a heat sink varies depending on the average power loss Pd in the hybrid IC. As shown in Figure 6 on page 13, Pd increases in accordance with the increase of the output current. Since the starting current and the stationary current coexist in an actual motor operation, Pd cannot be obtained only from the data shown in Figure 6. Therefore, Pd is obtained assuming that the timing of the actual motor operation is a repeated operation shown in the following Figure 3. Figure 3. Timing Chart of Motor Operation The average power loss Pd in the hybrid IC upon an operation shown in Figure 3 can be obtained by the following equation (II): Pd = (T1 × P1 + T1 × P2 + T3 × P3 + T4 × P4) ÷ T0 (II) When the value obtained by the above equation (II) is equal to or less than 3.4W and the ambient temperature Ta is equal to or lower than 60°C, there is no need of providing a heat sink. Refer to Figure 7 for data of the operation substrate temperature when no heat sink is used. The size of the heat sink can be decided depending on θc-a obtained by the following equation (III) and from Figure 8. θc-a = (Tc max – Ta) ÷ Pd (III) where Tc max: Maximum operation substrate temperature = 105 °C Ta: Ambient temperature of hybrid IC Although heat radiation design can be realized by following the above equations (II) and (III), make sure to check that the substrate temperature Tc is equal to or lower than 105 °C after mounting the hybrid IC into a set. ITF00811 Positive rotation current Reverse rotation current T1 T1: Starting time of positive rotation T2: Stationary time of positive rotation T3: Starting time of reverse rotation T4: Stationary time of reverse rotation T0: One cycle time of repeated motor operation P1: Pd of IO1 P2: Pd of IO2 P3: Pd of IO3 P4: Pd of IO4 IO1 IO2 IO3 T2 T0 T3 T4 0 IO4 |
Podobny numer części - STK673-011-E |
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Podobny opis - STK673-011-E |
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