STA533WF STMicroelectronics, STA533WF Datasheet - Page 11

• Manufacturer Part Number: STA533WF
• Description: AMP, AUDIO, POWER, QUAD, POWERSO36
• Manufacturer: STMicroelectronics

Specifications of STA533WF

• No. Of Channels: 4
• Output Power: 40W
• Supply Voltage Range: 5V To 18V
• Load Impedance: 8ohm
• Operating Temperature Range: 0°C To +70°C
• Amplifier Case Style: PowerSSO
• No. Of Pins: 36
• Svhc: No SVHC
• Rohs Compliant: Yes

STA533WF
4
Heatsink requirements
Using the STA533WF mounted on a double-layer PCB having 2 copper ground areas of
3 x 3 cm
24 °C/W in natural air convection.
Figure 8.
With the dissipated power within the device depending primarily on the supply voltage, the
load impedance and the output modulation level, the maximum estimated dissipated power,
Pdmax, for the STA533WF is:
The figure below shows the power derating curve for the PowerSSO36 EPD package on
PCBs with copper areas of 2 x 2 cm
Figure 9.
Pd (W)
4 W for 2 x 20 W into 8 Ω at 18 V
< 5 W for 2 x 10 W into 8 Ω + 1 x 20 W into 4 Ω at 18 V.
2
and with 16 via holes the junction to ambient thermal resistance is approximately
Double-layer PCB with copper ground areas and 16 via holes
Power derating curves for PCB used as heatsink
8
7
6
5
4
3
2
1
0
0
Copper Area 2x2 cm
and via holes
20
Doc ID 17658 Rev 1
Copper Area 3x3 cm
and via holes
40
2
and 3 x 3 cm
60
Tamb ( °C)
80
2
.
100
TDA7491P
PSSO36
STA533WF
PowerSSO36
120
Heatsink requirements
140
160
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