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TPA0112 Datasheet(PDF) 29 Page - Texas Instruments |
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TPA0112 Datasheet(HTML) 29 Page - Texas Instruments |
29 / 34 page TPA0112 2-W STEREO AUDIO POWER AMPLIFIER WITH FOUR SELECTABLE GAIN SETTINGS SLOS204B – MAY 1999 – REVISED MARCH 2000 29 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION crest factor and thermal considerations (continued) Table 5. TPA0112 Power Rating, 5-V, 8- Ω, Stereo PEAK OUTPUT POWER AVERAGE OUTPUT POWER POWER DISSIPATION (W/Channel) MAXIMUM AMBIENT TEMPERATURE 2.5 W 1250 mW (3 dB crest factor) 0.55 100 °C 2.5 W 1000 mW (4 dB crest factor) 0.62 94 °C 2.5 W 500 mW (7 dB crest factor) 0.59 97 °C 2.5 W 250 mW (10 dB crest factor) 0.53 102 °C The maximum dissipated power, PDmax, is reached at a much lower output power level for an 8 Ω load than for a 3 Ω load. As a result, this simple formula for calculating PDmax may be used for an 8 Ω application: P Dmax + 2V2 DD p2R L (11) However, in the case of a 3 Ω load, the PDmax occurs at a point well above the normal operating power level. The amplifier may therefore be operated at a higher ambient temperature than required by the PDmax formula for a 3 Ω load. The maximum ambient temperature depends on the heat sinking ability of the PCB system. The derating factor for the PWP package is shown in the dissipation rating table (see page 4). Converting this to ΘJA: Θ JA + 1 Derating Factor + 1 0.022 + 45°C W (12) To calculate maximum ambient temperatures, first consider that the numbers from the dissipation graphs are per channel so the dissipated power 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 TPA0112 is 150 °C. The internal dissipation figures are taken from the Power Dissipation vs Output Power graphs. T A Max + TJ Max * ΘJA PD + 150 * 45(0.6 2) + 96°C (15 dB crest factor) (13) NOTE: Internal dissipation of 0.6 W is estimated for a 2-W system with 15 dB crest factor per channel. Tables 4 and 5 show that for some applications no airflow is required to keep junction temperatures in the specified range. The TPA0112 is designed with thermal protection that turns the device off when the junction temperature surpasses 150 °C to prevent damage to the IC. Tables 4 and 5 were 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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