Designing Practical High Performance Class D Audio Amplifier
Designing Practical High Performance Class D Audio Amplifier
Designing Practical High Performance Class D Audio Amplifier
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Typical Case Scenario<br />
Thermal <strong>Performance</strong><br />
No Heatsink<br />
Worst Case Scenario<br />
Test Conditions:<br />
100W/8Ω, 1% THD, +/- 45Vbus,<br />
fsw=400KHz, T AMBIENT<br />
~ 25°C<br />
Case Temperature (°C)<br />
120<br />
100<br />
80<br />
60<br />
40<br />
20<br />
<strong>Amplifier</strong> specs: 100W/8Ω<br />
full power<br />
Estimated Plosses=1.6W<br />
1/8 power<br />
Estimated Plosses=0.6W<br />
After 10 minutes IRF6665 case<br />
temperature = 80.1°C @ 100W/8Ω<br />
without heatsink (ΔTc = 55.1°C)<br />
0<br />
T AMBIENT<br />
~ 20 °C<br />
0 100 200 300 400 500<br />
Time (s)<br />
Full Power: T C =104°C @ 5min (ΔT C =83°C)<br />
1/8 Power: T C =58°C @ 5min (ΔT C =39°C)<br />
www.irf.com
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