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STK4412 데이터시트(PDF) 6 Page - Sanyo Semicon Device |
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STK4412 데이터시트(HTML) 6 Page - Sanyo Semicon Device |
6 / 7 page STK4412 No. 2860—6/7 Sample Application Circuit (protection circuit and muting circuit) Thermal Design The IC power dissipation of the STK4412 at the IC-oper- ated mode is 26.8W max. at load resistance 8 Ω (simulta- neous drive of 2 channels) for continuous sine wave as shown in Figure 1. In an actual application where a music signal is used, it is impractical to estimate the power dissipation based on the continuous signal as shown right, because too large a heat sink must be used. It is reasonable to estimate the power dissipation as 1/10 Po max. (EIAJ). That is, Pd = 17.2W at 8 Ω Thermal resistance θc-a of a heat sink for this IC power dissipation (Pd) is fixed under conditions 1 and 2 shown below. Figure 1. STK4412 Pd – Po (RL = 8Ω) Output power, Po - W Condition 1: TC = Pd × θc-a + Ta ≤ 125°C .............................................. (1) where Ta : Specified ambient temperature TC : Operating substrate temperature Condition 2: Tj = Pd × (θc-a) + Pd/4 × (θj-c) + Ta ≤ 150°C.................... (2) where Tj : Junction temperature of power transistor Assuming that the power dissipation is shared equally among the four power transistors (2 channels × 2), thermal resis- tance θj-c is 3.6°C/W and Pd × (θc-a + 3.6/4) + Ta ≤ 150°C........................................ (3) |
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