STK433-090-E Sanyo, STK433-090-E Datasheet - Page 7

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

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Evaluation Board Characteristics
[Thermal Design Example for STK433-090-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
120
100
1.0
0.1
10
80
60
40
20
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 =±33V
VG=30dB
R L =6Ω
2ch Drive
Rg=600Ω
Tc=25°C
f=1kHz
R L =6Ω
2ch Drive
VG=30dB
Rg=600Ω
2
3
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
20
Supply voltage, V CC - ±V
Output power, P O /ch - W
1.0
P O - V CC
THD - P O
2
3
30
5 7
10
Ta: Guaranteed ambient temperature for the end product
N: Number of power transistors
θj-c: Thermal resistance per power transistor
40
2
3
5 7 100
STK433-090-E
ITF02640
ITF02642
50
V CC
R L
Ta
120
100
120
100
80
60
40
20
80
60
40
20
0
0
0.1
10
V CC =±33V
VG=30dB
f=1kHz
Rg=600Ω
Tc=25°C
R L =6Ω
2ch Drive
(same output rating)
2 3
2 3
5 7
5 7
100
1.0
Output power, P O /ch - W
2 3
2 3
Frequency, f - Hz
THD=0.4%
THD=10%
Pd - P O
5 7
5 7
P O - f
10
1k
2 3
2 3
5 7
5 7
10k
100
No. A1248-7/11
V CC =±33V
VG=30dB
Rg=600Ω
Tc=25°C
R L =6Ω
2ch Drive
2 3
2 3
5 7
5 7
ITF02641
ITF02643
1000
100k