TDA7491P STMicroelectronics, TDA7491P Datasheet - Page 38

• Manufacturer Part Number: TDA7491P
• Description: IC, AMP, AUDIO, CLASS D, 36POWERSO
• Manufacturer: STMicroelectronics

Specifications of TDA7491P

• Amplifier Class: D
• No. Of Channels: 2
• Output Power: 10W
• Supply Voltage Range: 5V To 18V
• Thd + N: 0.1% @ 1W, 6ohm, VCC=11V
• Load Impedance: 8ohm
• Operating Temperature Range: 0°C To +70°C
• Rohs Compliant: Yes

Applications information
7.9
38/40
Heatsink requirements
A thermal resistance of 24 °C/W can be obtained using the PCB copper ground layer with
16 vias connecting it to the contact area for the exposed pad. Ensure that the copper ground
area is a nominal 9 cm
Figure 58
As with most amplifiers, the power dissipated within the device depends primarily on the
supply voltage, the load impedance and the output modulation level.
The maximum estimated power dissipation for the TDA7491P is less than 2 W. When
properly mounted on the above PCB the junction temperature could increase by 48 °C.
However, with a musical program the dissipated power is about 40% less than this, leading
to a temperature increase of around only 30 °C. So even at the maximum recommended
ambient temperature for consumer applications of 50 °C there is still a clear safety margin
before the maximum junction temperature (150 °C) is reached.
Figure 58. Power derating curves for PCB used as heatsink
Pd (W)
shows the derating curves for copper areas of 4 cm
8
7
6
5
4
3
2
1
0
0
Copper Area 2x2 cm
and via holes
2
for 24 °C/W.
20
Doc ID 13540 Rev 4
Copper Area 3x3 cm
and via holes
40
60
Tamb ( °C)
80
g
100
2
and 9 cm
TDA7491P
PSSO36
TDA7491P
PowerSSO-36
120
2
.
140
TDA7491P
160