TDA7491HV13TR STMicroelectronics, TDA7491HV13TR Datasheet - Page 39

• Manufacturer Part Number: TDA7491HV13TR
• Description: IC AMP AUD CLASS D BTL PWRSSO36
• Manufacturer: STMicroelectronics
• Type: Class Dr

Specifications of TDA7491HV13TR

• Output Type: 2-Channel
• Max Output Power X Channels @ Load: 20W x 2 @ 8 Ohm
• Voltage - Supply: 5 V ~ 18 V
• Features: Depop, Differential Inputs, Mute, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Surface Mount
• Package / Case: *
• Amplifier Class: D
• No. Of Channels: 2
• Output Power: 20W
• 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
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-11055-2

TDA7491HV
Using such a PCB with a copper ground layer of 3x3cm2 and 16 vias connecting it to the
contact area for the exposed pad, a thermal resistance , junction to ambient (in natural air
convection), of 24 °C/W can be achieved.
The dissipated power within the device depends primarly on the supply voltage , load
impedance and output modulation level.With the TDA7491HV driving 2x8
18V then the device dissipation is approximately 4W that gives with the above mentioned
PCB a junction temperature increase of about 90°C.
With a musical program the dissipated power is about 40% less than the above maximum
value.This leads to a junction temperature increase of around 60 °C. So even at the
maximum recommended ambient temperature there is a margin of safety before the
maximum junction temperature is reached.
Figure 59
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
20
Doc ID 14242 Rev 5
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
Ω
.
140
with a supply of
160
39/41