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STK4412 데이터시트(PDF) 6 Page - Sanyo Semicon Device

부품명 STK4412
상세설명  2-Channel AF Power Amplifier (20W20W min, THD = 1.0%)
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제조업체  SANYO [Sanyo Semicon Device]
홈페이지  https://www.sanyo-av.com/us/
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STK4412 데이터시트(HTML) 6 Page - Sanyo Semicon Device

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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
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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