STK433-090-E Sanyo, STK433-090-E Datasheet - Page 8

• Manufacturer Part Number: STK433-090-E
• Description: 2-Channel Class AB Audio Power IC
• Manufacturer: Sanyo

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+V CC
GND
-V CC
[Example]
STK433-100 Series Standby Control, Mute Control, Load-short Protection & DC
offset Protection application
When the IC supply voltage, V CC , is ±33V and R L is 6Ω, the total power dissipation, Pd, within the hybrid IC, will
be a maximum of 75W 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 4, and the thermal resistance per
transistor, θj-c, is 2.1°C/W. Therefore, the required heat sink thermal resistance for a guaranteed ambient temperature,
Ta, of 50°C will be as follows.
Therefore, the value of 1.17°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 ≈ 59.0W
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
STK433-100 series
56kΩ
OUT
Ch2
6
6.8kΩ
OUT
Ch2
7
+PRE
8
(when 1/8P O max. = 10W, P O max. = 80W).
θc-a < (125 − 50)/59.0
θc-a < (150 − 50)/59.0 − 2.1/4
SUB
9
< 1.27
< 1.17
GND
10
Ch2 OUT
GND
GND
Ch1 OUT
STK433-090-E
Ch1
11
IN
0.1μF
10kΩ 100kΩ
Ch1
12
82kΩ
82kΩ
NF
1kΩ
22kΩ
ST-BY
56kΩ
22μF
22μF
13
Latch up
circuit
DC offset protection
14
Ch2
NF
R1
(*1)
100
kΩ
Ch2
15
IN
V1
(*1) The voltage applied to the Stand-by pin (#13) must not exceed the
maximum rated value (VST max).
13kΩ
(*1)
Standby
Control
Mute
Control
10kΩ
10kΩ
33μF
ST-BY
/10V
+5V
33kΩ
2.2kΩ
10kΩ
1kΩ
2kΩ
+5V
Ch2 IN
GND
Ch1 IN
MUTE
PLAY
Stand-by Control (ex)
H: Operation Mode (+5V)
L: Stand-by Mode (0V)
Mute Control
H: Single Mute
L: Normal
No. A1248-8/11
MUTE
ST-BY