STK433-240A-E SANYO Semiconductor, STK433-240A-E Datasheet - Page 8

• Manufacturer Part Number: STK433-240A-E
• Description: 3-channel class AB audio power IC
• Manufacturer: SANYO Semiconductor

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+V CC
GND
-V CC
[Example]
STK433-200(A)-E series Stand-by control, Mute control, Load-short protection & DC
offset protection application
When the IC supply voltage, V CC , is ±24V and R L is 6Ω, the total power dissipation, Pd, within the hybrid IC, will
be a maximum of 60W at 1kHz for a continuous sine wave signal according to the Pd-P O characteristics.
For the music signals normally handled by audio amplifiers, a value of 1/8P O 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:
The number of power transistors in audio amplifier block of these hybrid ICs, N, is 6, 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.
Therefore, the value of 1.42°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.
-PRE
1
Pd ≈ 47.0W
From formula (1)'
From formula (2)'
-V CC
2
+V CC
3
Load short
protection
circuit
56kΩ
OUT
Ch1
4
6.8kΩ
OUT
Ch1
5
56kΩ
OUT
Ch2
6
6.8kΩ
STK433-200(A)-E series
OUT
Ch2
7
+PRE
8
(when 1/8P O max. = 5.0W, P O max. = 40W).
θc-a < (125 − 50)/47.0
θc-a < (150 − 50)/47.0 − 4.2/6
SUB
9
< 1.59
< 1.42
GND
10
Ch3 OUT
GND
Ch2 OUT
GND
GND
Ch1 OUT
STK433-240A-E
Ch1
11
IN
10kΩ
0.1μF
Ch1
12
NF
82kΩ
82kΩ
82kΩ
1kΩ
22kΩ
100kΩ
ST-BY
56kΩ
13
22μF
22μF
Latch up
circuit
DC offset protection
(*4)
R2
14
Ch2
NF
100kΩ
15
Ch2
IN
16
Ch3
IN
Ch3
17
NF
56kΩ
OUT
Ch3
18
6.8kΩ
Stand-by
Control
Mute
Control
OUT
Ch3
19
+5V
ST-BY
2.7kΩ
(*1)
(ex)
(*1) The voltage applied to the Stand-by pin (#13)
10kΩ
10kΩ
10kΩ
must not exceed the maximum rated value (VST max).
10kΩ
2.2kΩ
MUTE
+5V
33μF
/10V
PLAY
33kΩ
1kΩ
Ch3 IN
Ch2 IN
GND
Ch1 IN
2kΩ
Mute Control
H: Single Mute
L: Normal
MUTE
No. A1490-8/10
Stand-by Control(ex)
H: Operation Mode(+5V)
L: Stand-by Mode(0V)
ST-BY