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TPA032D02 Datasheet(PDF) 20 Page - Texas Instruments |
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TPA032D02 Datasheet(HTML) 20 Page - Texas Instruments |
20 / 23 page TPA032D02 10-W STEREO CLASS-D AUDIO POWER AMPLIFIER SLOS243A – DECEMBER 1999 – REVISED MARCH 2000 20 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION crest factor and thermal considerations (continued) Table 3. TPA032D02 Power Rating, 12-V, 4- Ω, Stereo PEAK OUTPUT POWER AVERAGE OUTPUT POWER POWER DISSIPATION MAXIMUM AMBIENT (W) AVERAGE OUTPUT POWER (W/Channel) TEMPERATURE 20 10 W (3 dB) 2.84 23 °C 20 5 W (6 dB) 1.66 75 °C 20 2.5 W (9 dB) 1.12 100 °C 20 1.25 W (12 dB) 0.87 111 °C 20 630 mW (15 dB) 0.7 118 °C 20 315 mW (18 dB) 0.6 123 °C The maximum ambient temperature depends on the heatsinking ability of the PCB system. Using the 0 CFM data from the dissipation rating table, the derating factor for the DCA package with 6.9 in2 of copper area on a multilayer PCB is 44.8 mW/ °C. Converting this to ΘJA: Θ JA + 1 Derating + 1 0.0448 + 22.3°C W (19) To calculate maximum ambient temperatures, first consider that the numbers from the dissipation graphs are per channel so the dissipated heat needs to be doubled for two channel operation. Given ΘJA, the maximum allowable junction temperature, and the total internal dissipation, the maximum ambient temperature can be calculated with the following equation. The maximum recommended junction temperature for the TPA032D02 is 150 °C. The internal dissipation figures are taken from the Efficiency vs Output Power graphs. T A Max + TJ Max * ΘJA PD + 150 * 22.3(0.7 2) + 118°C (15 dB crest factor) + 150 * 22.3(2.84 2) + 23°C (3dB crest factor) (20) NOTE: Internal dissipation of 1.4 W is estimated for a 10-W system with a 15 dB crest factor per channel. The TPA032D02 is designed with thermal protection that turns the device off when the junction temperature surpasses 150 °C to prevent damage to the IC. Table 3 was calculated for maximum listening volume without distortion. When the output level is reduced the numbers in the table change significantly. Also, using 8- Ω speakers dramatically increases the thermal performance by increasing amplifier efficiency. |
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