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TPA0242 Fiches technique(PDF) 21 Page - Texas Instruments |
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TPA0242 Fiches technique(HTML) 21 Page - Texas Instruments |
21 / 29 page TPA0242 STEREO 2-W AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL AND MUX CONTROL SLOS287 – NOVEMBER 1999 21 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION bridged-tied load versus single-ended mode Figure 33 shows a Class-AB audio power amplifier (APA) in a BTL configuration. The TPA0242 BTL amplifier consists of two Class-AB amplifiers driving both ends of the load. There are several potential benefits to this differential drive configuration, but, initially consider power to the load. The differential drive to the speaker means that as one side is slewing up, the other side is slewing down, and vice versa. This in effect doubles the voltage swing on the load as compared to a ground referenced load. Plugging 2 × VO(PP) into the power equation, where voltage is squared, yields 4 × the output power from the same supply rail and load impedance (see equation 5). Power + V (rms) 2 R L (5) V (rms) + V O(PP) 22 RL 2x VO(PP) VO(PP) –VO(PP) VDD VDD Figure 33. Bridge-Tied Load Configuration In a typical computer sound channel operating at 5 V, bridging raises the power into an 8- Ω speaker from a singled-ended (SE, ground reference) limit of 250 mW to 1 W. In sound power that is a 6-dB improvement — which is loudness that can be heard. In addition to increased power there are frequency response concerns. Consider the single-supply SE configuration shown in Figure 34. A coupling capacitor is required to block the dc offset voltage from reaching the load. These capacitors can be quite large (approximately 33 µF to 1000 µF) so they tend to be expensive, heavy, occupy valuable PCB area, and have the additional drawback of limiting low-frequency performance of the system. This frequency limiting effect is due to the high pass filter network created with the speaker impedance and the coupling capacitance and is calculated with equation 6. f (c) + 1 2 pR L CC (6) |
Numéro de pièce similaire - TPA0242 |
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Description similaire - TPA0242 |
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