STK433-070-E Sanyo Semicon Device, STK433-070-E Datasheet - Page 7

• Manufacturer Part Number: STK433-070-E
• Description: Thick-Film Hybrid IC 2-channel class AB audio power IC 60W+60W
• Manufacturer: Sanyo Semicon Device

Evaluation Board Characteristics
[Thermal Design Example for STK433-070-E (R L = 6Ω)]
The thermal resistance, θc-a, of the heat sink for total power dissipation, Pd, within the hybrid IC is determined as
follows.
Condition 1: The hybrid IC substrate temperature, Tc, must not exceed 125°C.
Condition 2: The junction temperature, Tj, of each power transistor must not exceed 150°C.
However, the power dissipation, Pd, for the power transistors shall be allocated equally among the number of power
transistors.
The following inequalities result from solving equations (1) and (2) for θc-a.
Values that satisfy these two inequalities at the same time represent the required heat sink thermal resistance.
When the following specifications have been stipulated, the required heat sink thermal resistance can be determined
from formulas (1)' and (2)' .
0.001
0.01
100
100
1.0
0.1
10
90
80
70
60
50
40
30
20
10
7
5
3
2
7
5
3
2
7
5
3
2
7
5
3
2
7
5
3
2
0
0.1
10
V CC =±29V
VG=30dB
Rg=600Ω
Tc=25°C
R L =6Ω
2ch Drive
VG=30dB
Rg=600Ω
R L =6Ω
Tc=25°C
f=1kHz
2ch Drive
2
3
15
Pd × θc-a + Ta < 125°C ................................................................................................. (1)
Pd × θc-a + Pd/N × θj-c + Ta < 150°C .......................................................................... (2)
θc-a < (125 − Ta)/Pd ...................................................................................................... (1)'
θc-a < (150 − Ta)/Pd − θj-c/N ........................................................................................ (2)'
• Supply voltage
• Load resistance
• Guaranteed ambient temperature
5 7
Supply voltage, V CC - ±V
Output power, P O /ch - W
1.0
20
THD - P O
P O - V CC
2
25
3
5 7
10
30
Ta: Guaranteed ambient temperature for the end product
N: Number of power transistors
θj-c: Thermal resistance per power transistor
2
3
35
5 7 100
STK433-070-E
ITF02678
ITF02680
40
V CC
R L
Ta
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
0
0.1
10
V CC =±29V
VG=30dB
f=1kHz
Rg=600Ω
Tc=25°C
R L =6Ω
2ch Drive
2 3
2
3
5 7
5 7
100
Output power, P O /ch - W
1.0
2 3
Frequency, f - Hz
Pd - P O
5 7
2
P O - f
3
1k
5 7
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2 3
10
5 7
10k
2
V CC =±29V
VG=30dB
Rg=600Ω
Tc=25°C
R L =6Ω
2ch Drive
No. A1488-7/11
3
2 3
5 7 100
5 7
ITF02679
ITF02681
100k