STK4432 데이터 시트보기 (PDF) - SANYO -> Panasonic
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STK4432 Datasheet PDF : 7 Pages
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STK4432
Sample Application Circuit (protection circuit and muting circuit)
Thermal Design
The IC power dissipation of the STK4432 at the IC-oper-
ated mode is 30W max. at load resistance 8Ω (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 = 21.5W at 8Ω
Thermal resistance θc-a of a heat sink for this IC power
dissipation (Pd) is fixed under conditions 1 and 2 shown
below.
Output power, Po - W
Figure 1. STK4432 Pd – Po (RL = 8Ω)
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 2.8°C/W and
Pd × (θc-a + 2.8/4) + Ta ≤ 150°C........................................ (3)
No. 2885—6/7
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