STK433-030-E Sanyo, STK433-030-E Datasheet - Page 7

• Manufacturer Part Number: STK433-030-E
• Description: 2-Channel Class AB Audio Power IC
• Manufacturer: Sanyo

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Evaluation Board Characteristics
[Thermal Design Example for STK433-030-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
1.0
0.1
10
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
5
V CC =±21V
VG=30dB
Rg=600Ω
Tc=25°C
R L =6Ω
2ch Drive
VG=30dB
Rg=600Ω
R L =6Ω
Tc=25°C
2ch Drive
2
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)'
3
• Supply voltage
• Load resistance
• Guaranteed ambient temperature
10
5 7
Supply voltage, V CC - ±V
Output power, P O /ch - W
1.0
P O - V CC
THD - P O
15
2
3
5 7
20
10
Ta: Guaranteed ambient temperature for the end product
N: Number of power transistors
θj-c: Thermal resistance per power transistor
2
25
3
5 7 100
STK433-030-E
ITF02622
ITF02620
30
V CC
R L
Ta
50
40
30
20
10
50
40
30
20
10
0
0
0.1
10
V CC =±21V
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
THD=10%
THD=0.4%
Pd - P O
5 7
2
P O - f
3
1k
5 7
2 3
10
5 7
10k
2
No. A1247-7/11
V CC =±21V
VG=30dB
Rg=600Ω
Tc=25°C
R L =6Ω
2ch Drive
3
2 3
5 7 100
5 7
ITF02621
ITF02623
100k