sta333bwqs13tr STMicroelectronics, sta333bwqs13tr Datasheet - Page 66

• Manufacturer Part Number: sta333bwqs13tr
• Description: 2.1-channel High-efficiency Digital Audio System With Qsound Qhd
• Manufacturer: STMicroelectronics

Package thermal characteristics
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Package thermal characteristics
Using a double-layer PCB the thermal resistance junction to ambient with 2 copper ground
area of 3x3 cm and with 16 via holes (see
The dissipated power within the device depends primarily on the supply voltage, load
impedance and output modulation level.
The estimated maximum dissipated power for the STA333BWQS is:
2 x 20 W into 8 Ω, 18 V
2 x 10 W + 1 x 20 W into 4 Ω, 8 Ω, 18 V
Figure 28. Double layer PCB with 16 via holes
Figure 29
two different sizes of copper layers.
Figure 29. PowerSSO-36 power derating curve
shows the power derating curve for the PowerSSO-36 package on a board with
Pd (W)
Pd (W)
8
8
8
8
8
8
7
7
7
7
7
7
6
6
6
6
6
6
5
5
5
5
5
5
4
4
4
4
4
4
3
3
3
3
3
3
2
2
2
2
2
2
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
Copper Area 2x2 cm
Copper Area 2x2 cm
and via holes
and via holes
20
20
20
20
20
40
40
40
40
40
Copper Area 3x3 cm
Copper Area 3x3 cm
and via holes
and via holes
60
60
60
60
60
Figure
Pd max ~ 4 W
Pd max < 5 W
Tamb ( °C)
Tamb ( °C)
80
80
80
80
80
28) is 24 °C/W in natural air convection.
100
100
100
100
100
STA333BWQS
PowerSSO-36
120
120
120
120
120
STA333BW
STA333BW
PSSO36
PSSO36
140
140
140
140
140
160
160
160
160
160
STA333BWQS