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STK433-030-E Arkusz danych(PDF) 8 Page - Sanyo Semicon Device

Numer części STK433-030-E
Szczegółowy opis  2-channel class AB audio power IC, 30W30W
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Producent  SANYO [Sanyo Semicon Device]
Strona internetowa  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

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STK433-030-E
No. A1247-8/11
[Example]
When the IC supply voltage, VCC, is ±21V and RL is 6Ω, the total power dissipation, Pd, within the hybrid IC, will
be a maximum of 31W at 1kHz for a continuous sine wave signal according to the Pd-PO characteristics.
For the music signals normally handled by audio amplifiers, a value of 1/8PO max is generally used for Pd as an
estimate of the power dissipation based on the type of continuous signal. (Note that the factor used may differ
depending on the safety standard used.)
This is:
Pd
≈ 24.0W
(when 1/8PO max. = 3.75W, PO max. = 30W).
The number of power transistors in audio amplifier block of these hybrid ICs, N, is 4, and the thermal resistance per
transistor,
θj-c, is 4.2°C/W. Therefore, the required heat sink thermal resistance for a guranteed ambient temperature,
Ta, of 50
°C will be as follows.
From formula (1)'
θc-a < (125 − 50)/24.0
< 3.13
From formula (2)'
θc-a < (150 − 50)/24.0 − 4.2/4
< 3.12
Therefore, the value of 3.12
°C/W, which satisfies both of these formulae, is the required thermal resistance of the heat
sink.
Note that this thermal design example assumes the use of a constant-voltage power supply, and is therefore not a
verified design for any particular user’s end product.
STK433-000 Series Standby Control, Mute Control, Load-short Protection & DC
offset Protection application
2
3
4
5
6
7
8
9
10
11
12
13
14
1
15
Ch1 OUT
GND
+VCC
-VCC
STK433-000 series
ST-BY
56k
Ω
GND
Ch2 IN
GND
Ch1 IN
+VCC
Ch1
IN
Ch1
NF
Ch2
IN
Ch2
NF
Ch2
OUT
Ch1
OUT
-VCC
SUB
GND
+PRE
ST-BY
Ch1
OUT
Ch2
OUT
-PRE
6.8k
Ω
56k
Ω
6.8k
Ω
Load short
protection
circuit
22k
Ω
56k
Ω
1k
Ω
0.1
μF
10k
Ω 100kΩ
(*4)
R2
1k
Ω
33k
Ω
2k
Ω
(*1) R1
ex) 5.1k
Ω
33
μF
/10V
10k
Ω
10k
Ω
10k
Ω
2.2k
Ω
V1
GND
Ch2 OUT
82k
Ω
82k
Ω
100
k
Ω
22
μF
22
μF
PLAY
MUTE
ST-BY
MUTE
+5V
+5V
Standby
Control
Mute
Control
Mute Control
H: Single Mute
L: Normal
Stand-by Control (ex)
H: Operation Mode (+5V)
L: Stand-by Mode (0V)
DC offset protection
(*1) The voltage applied to the Stand-by pin (#13) must not exceed the
maximum rated value (VST max).
(*1) R1 is changed depending on the power-supply voltage (-VCC).
Please set resistance (R1) to become “V1
≈ 0V” by the following calculation types.
Latch up
circuit


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