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TDA8947J Datasheet(PDF) 18 Page - NXP Semiconductors |
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TDA8947J Datasheet(HTML) 18 Page - NXP Semiconductors |
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18 / 24 page  Philips Semiconductors TDA8947J 4-channel audio amplifier Preliminary data Rev. 01 — 06 February 2004 18 of 24 9397 750 10779 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 13.3 Thermal behavior and heatsink calculation The measured maximum thermal resistance of the IC package, Rth(j-mb), is 1.3 K/W. A calculation for the heatsink can be made, with the following parameters: Tamb(max) =60 °C (example) VCC = 18 V and RL =4 Ω (SE) Tj(max) = 150 °C (specification) Rth(tot) is the total thermal resistance between the junction and the ambient including the heatsink. This can be calculated using the maximum temperature increase divided by the power dissipation: Rth(tot) =(Tj(max) − Tamb(max))/PD At VCC =18V and RL =4 Ω (4 × SE) the measured worst-case sine-wave dissipation is 17 W; see Figure 9. For Tj(max) = 150 °C the temperature raise, caused by the power dissipation, is: 150 − 60=90 °C: P × R th(tot) =90 °C Rth(tot) = 90/17 = 5.29 K/W Rth(h-a) =Rth(tot) − Rth(j-mb) = 5.29 − 1.3 = 3.99 K/W This calculation is for an application at worst-case (stereo) sine-wave output signals. In practice music signals will be applied, which decreases the maximum power dissipation to approximately half of the sine-wave power dissipation of 9 W (see Section 8.2.2). This allows for the use of a smaller heatsink: P × R th(tot) =90 °C Rth(tot) = 90/9 = 10 K/W Rth(h-a) =Rth(tot) − Rth(j-mb) =10 − 1.3 = 8.7 K/W |
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