TDA7491HV STMicroelectronics, TDA7491HV Datasheet - Page 39

• Manufacturer Part Number: TDA7491HV
• Description: IC, AMP, AUDIO, CLASS D, 36POWERSO
• Manufacturer: STMicroelectronics

Specifications of TDA7491HV

• Amplifier Class: D
• No. Of Channels: 2
• Supply Voltage Range: 5V To 18V
• Thd + N: 0.1% @ 1W, 8ohm, VCC=18V
• Load Impedance: 8ohm
• Operating Temperature Range: 0°C To +70°C
• Amplifier Case Style: PowerSO
• Output Power: 20W
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TDA7491HV
7.9
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 59
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 TDA7491HV is less than 4 W. When
properly mounted on the above PCB the junction temperature could increase by 96 °C.
However, with a musical program the dissipated power is about 40% less than this, leading
to a temperature increase of around 60 °C. So even at the maximum recommended ambient
temperature for consumer applications there is still a margin of safety before the maximum
junction temperature is reached.
Figure 59. 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 14242 Rev 4
Copper Area 3x3 cm
and via holes
40
60
Tamb ( °C)
80
g
100
2
and 9 cm
TDA7491P
PSSO36
TDA7491HV
PowerSSO-36
120
Application information
2
.
140
160
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