stk433-290-e Sanyo Semiconductor Corporation, stk433-290-e Datasheet - Page 9

• Manufacturer Part Number: stk433-290-e
• Description: Thick-film Hybrid 3-channel Class Audio Power 3-channel Class Audio Power
• Manufacturer: Sanyo Semiconductor Corporation

+V CC
-V CC
GND
[Example]
STK433-300series Stand-by Control & Mute Control & Load-Short 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 109.7W 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 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 0.82°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 ≈ 85.0W
From formula (1)'
From formula (2)'
-V CC
2
+V CC
3
56kΩ
Load Short Protection
Circuit
OUT
Ch1
4
6.8kΩ
OUT
Ch1
5
56kΩ
OUT
Ch2
6
6.8kΩ
OUT
Ch2
STK433-300 series
7
+PRE
8
SUB.GND
SUB GND
9
(when 1/8P O max. = 10W, P O max. = 80W).
θc-a < (125 − 50)/85.0
θc-a < (150 − 50)/85.0 − 2.1/6
10
< 0.88
< 0.82
Ch1
11
IN
0.1μF
STK433-290-E
Ch1
12
NF
22kΩ
10kΩ
ST-
BY
13
56kΩ
100kΩ
1kΩ
Ch2
NF
14
Latch Up
Circuit
Ch2
15
IN
Ch3
16
IN
Ch3
17
NF
Ch3 OUT
Ch2 OUT
GND
GND
GND
Ch1 OUT
56kΩ 6.8kΩ
OUT
Ch3
18
OUT
Ch3
19
Stand-by Control
(*1) The impression voltage of a Stand-by terminal (#13) is
Mute Control
2.7kΩ
the maximum rating (VST max). Please set up not to exceed.
+5V
ST-BY
33μF
/10V
33kΩ
1kΩ
Mute Control
H: Single Mute
L: Normal
Stand-by Control(ex)
MUTE
H: Operation Mode(+5V)
L: Stand-by Mode(0V)
+5V
2kΩ
PLAY
10kΩ
10kΩ
10kΩ
10kΩ
2.2kΩ
MUTE
No. A1630-9/13
Ch3 IN
Ch2 IN
GND
Ch1 IN
ST-BY