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STA333BW Datasheet(PDF) 63 Page - STMicroelectronics

Part # STA333BW
Description  2.1-channel 40-watt high-efficiency digital audio system Sound Terminal®
PDF  67 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA333BW Datasheet(HTML) 63 Page - STMicroelectronics

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STA333BW
Package thermal characteristics
Doc ID 13773 Rev 3
63/67
8
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 STA333BW is:
Figure 21 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 21.
PowerSSO-36 power derating curve
2 x 20 W @ 8
Ω, 18 V
Pd max is approximately 4 W
2 x 9 W + 1 x 20 W @ 4
Ω, 8 Ω, 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
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Pd (W)
Tamb ( °C)
Copper Area 2x2 cm
and via holes
STA339BW
PSSO36
Copper Area 3x3 cm
and via holes
STA333BW
PowerSSO-36



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