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TDA1565TH 데이터시트(PDF) 6 Page - NXP Semiconductors |
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TDA1565TH 데이터시트(HTML) 6 Page - NXP Semiconductors |
6 / 27 page 2004 Jan 27 6 Philips Semiconductors Product specification High efficiency 2 × 40 W / 2 Ω stereo car radio power amplifier TDA1565TH Heatsink design There are two parameters that determine the size of the heatsink. The first is the rating of the virtual junction temperature and the second is the ambient temperature at which the amplifier must still deliver its full power in the BTL mode. Example: With a conventional BTL amplifier, the maximum power dissipation for a typical signal, such as music (at each amplifier) will be approximately two times 15 W. At a virtual junction temperature of 150 °C and a maximum ambient temperature of 65 °C, Rth(vj-c) = 1.8 K/W and Rth(c-h) = 0.2 K/W. For a conventional BTL amplifier the thermal resistance of the heatsink should be: Compared to a conventional BTL amplifier, the TDA1565TH has a higher efficiency. The thermal resistance of the heatsink should be: (see Fig.6). handbook, halfpage MHC601 VOUT1; VOUT2 VDIAG 0 0 t Fig.4 Clip detection waveforms. handbook, halfpage MHC595 output pins short-circuit (to ground) short-circuit removed loudspeaker short-circuit 500 ms 500 ms 500 ms 500 ms 500 ms VDIAG 0 Imax Imax t t 10 µs 10 µs 10 µs 10 µs 10 µs IOUT1; IOUT2 Fig.5 Short-circuit protection waveforms. 150 65 – 215 × ---------------------- 1.8 – 0.2 – 0.83 K/W = 150 65 – 210 × ---------------------- 1.8 – 0.2 – 2.25 K/W = handbook, halfpage MHC586 case virtual junction channel 2 channel 1 3.0 K/W 3.0 K/W 0.3 K/W Fig.6 Equivalent thermal resistance network. |
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