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STK4162II bảng dữ liệu(PDF) 8 Page - Sanyo Semicon Device

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Giải thích chi tiết về linh kiện  AF Power Amplifier (Split Power Supply) (35W 35W min, THD = 0.4%)
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STK4162II bảng dữ liệu(HTML) 8 Page - Sanyo Semicon Device

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STK4162II
No. 2886—8/8
s
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear
power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury,
death or property loss.
s
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Œ
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their
officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated
with such use:

Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO.,
LTD., its affiliates, subsidiaries and distributors or any of their officers and employees, jointly or severally.
s
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO
believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of
intellectual property rights or other rights of third parties.
This catalog provides information as of July, 1997. Specifications and information herein are subject to change without notice.
In an actual application where a music signal is used, it is impractical to estimate the power dissipation based on the con-
tinuous signal as shown above, because too large a heat sink must be used. It is reasonable to estimate the power dissipa-
tion as 1/10 Po max. (EIAJ).
That is, Pd = 28.5W at 8
Ω, Pd = 43.5W at 4Ω
Thermal resistance
θc-a of a heat sink for this IC power dissipation (Pd) is fixed under conditions 1 and 2 shown below.
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 2.1°C/W and
Pd
× (θc-a + 2.1/4) + Ta ≤ 150°C........................................ (3)
Thermal resistance
θc-a of a heat sink must satisfy ine-
qualities (1) and (3).
Figure 3 shows the relation between Pd and
θc-a given
from (1) and (3) with Ta as a parameter.
[Example] The thermal resistance of a heat sink is
obtained when the ambient temperature speci-
fied for a stereo amplifier is 50
°C.
Assuming VCC = ±30V, RL = 8Ω,
VCC = ±27V, RL = 4Ω,
RL = 8Ω : Pd1 = 28.5W at 1/10 Po max.
RL = 4Ω : Pd2 = 43.5W at 1/10 Po max.
The thermal resistance of a heat sink is
obtained from Figure 3.
RL = 8Ω : θc-a1 = 2.63°C/W
RL = 4Ω : θc-a2 = 1.72°C/W
Tj when a heat sink is used is obtained from
(3).
RL = 8Ω : Tj = 139.9°C
RL = 4Ω : Tj = 147.7°C
Figure 3. STK4162II
θc-a – Pd
IC Power dissipation, Pd - W


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