sta559bw STMicroelectronics, sta559bw Datasheet - Page 63

• Manufacturer Part Number: sta559bw
• Description: 5-volt, 2-amp, 2.1-channel High-efficiency Digital Audio System Sound Terminal
• Manufacturer: STMicroelectronics

STA559BW
8
Package thermal characteristics
Using a double-layer PCB the thermal resistance, junction to ambient, with 2 copper ground
areas of 3 x 3 cm
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 STA559BW is:
Figure 20
copper areas of 2 x 2 cm
Figure 20. PowerSSO-36 power derating curve
2 x 20 W @ 8 Ω, 18 V
2 x 9 W + 1 x 20 W @ 4 Ω, 8 Ω, 18 V
shows the power derating curve for the PowerSSO-36 package on PCBs with
Pd (W)
Pd (W)
2
and with 16 via holes is 24 °C/W in natural air convection.
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and 3 x 3 cm
Copper Area 2x2 cm
Copper Area 2x2 cm
and via holes
and via holes
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20
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Doc ID 18190 Rev 1
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Copper Area 3x3 cm
Copper Area 3x3 cm
and via holes
and via holes
2
.
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60
Tamb ( °C)
Tamb ( °C)
Pd max is approximately 4 W
Pd max is approximately 5 W
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Package thermal characteristics
STA559BW
PowerSSO-36
120
120
120
120
120
STA339BW
STA339BW
PSSO36
PSSO36
140
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140
160
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160
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