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TPA032D01 Datasheet(PDF) 20 Page - Texas Instruments |
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TPA032D01 Datasheet(HTML) 20 Page - Texas Instruments |
20 / 25 page TPA032D01 10W MONO CLASSD AUDIO POWER AMPLIFIER SLOS282B − DECEMBER 1999 − REVISED JUNE 2000 20 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION crest factor and thermal considerations (continued) Table 3. TPA032D01 Power Rating, 12-V, 4- Ω, Stereo PEAK OUTPUT POWER AVERAGE OUTPUT POWER POWER DISSIPATION MAXIMUM AMBIENT PEAK OUTPUT POWER (W) AVERAGE OUTPUT POWER POWER DISSIPATION (W/Channel) MAXIMUM AMBIENT TEMPERATURE 20 10 W (3 dB) 2.84 87 °C 20 5 W (6 dB) 1.66 113 °C 20 2.5 W (9 dB) 1.12 125 °C 20 1.25 W (12 dB) 0.87 125 °C 20 630 mW (15 dB) 0.7 125 °C 20 315 mW (18 dB) 0.6 125 °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 TPA032D01 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(0.35) + 125°C (15 dB crest factor) + 150 * 22.3(1.42) + 118°C (3dB crest factor) (20) (Maximum recommended case temperature is 125 °C) NOTE: Internal dissipation of 0.7 W is estimated for a 10-W system with a 15 dB crest factor per channel. The TPA032D01 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. |
Número de pieza similar - TPA032D01_07 |
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Descripción similar - TPA032D01_07 |
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