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STA339BWS Datasheet(PDF) 75 Page - STMicroelectronics

Part # STA339BWS
Description  2.1-channel 40-watt high-efficiency digital system Sound Terminal
PDF  79 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA339BWS Datasheet(HTML) 75 Page - STMicroelectronics

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DocID015276 Rev 9
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STA339BWS
Package thermal characteristics
79
9
Package thermal characteristics
Using a double-layer PCB the thermal resistance, junction to ambient, with 2 copper ground
areas of 3 x 3 cm2 and with 16 via holes is 24 °C/W in natural air convection.
The dissipated power within the device depends primarily on the supply voltage, load
impedance and output modulation level.
Thus, the maximum estimated dissipated power for the STA339BWS is:
Figure 25 shows the power derating curve for the PowerSSO-36 package on PCBs with
copper areas of 2 x 2 cm2 and 3 x 3 cm2.
Figure 25. PowerSSO-36 power derating curve
2 x 20 W @ 8
, 18 V
Pd max is approximately 4 W
2 x 9 W + 1 x 20 W @ 4
, 8 ,18 V
Pd max is approximately 5 W
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Pd (W)
Tamb ( °C)
Copper Area 2x2 cm
and via holes
STA339BW
PSSO36
Copper Area 3x3 cm
and via holes
0
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8
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6080
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8
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2040
6080
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120
140
160
0
1
2
3
4
5
6
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8
0
2040
6080
100
120
140
160
Pd (W)
Tamb ( °C)
Copper Area 2x2 cm
and via holes
STA339BW
PSSO36
Copper Area 3x3 cm
and via holes
STA339BWS
PowerSSO-



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