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TPA701 Datasheet(PDF) 12 Page - Texas Instruments |
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TPA701 Datasheet(HTML) 12 Page - Texas Instruments |
12 / 25 page TPA701 700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER SLOS229D – NOVEMBER1998 – REVISED MAY 2003 12 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION bridged-tied load Figure 23 shows a linear audio power amplifier (APA) in a BTL configuration. The TPA701 BTL amplifier consists of two linear 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 1). Power + V (rms) 2 R L (1) V (rms) + V O(PP) 22 RL 2x VO(PP) VO(PP) –VO(PP) VDD VDD Figure 23. Bridge-Tied Load Configuration In a typical portable handheld equipment sound channel operating at 3.3 V, bridging raises the power into an 8- Ω speaker from a singled-ended (SE, ground reference) limit of 62.5 mW to 250 mW. 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 24. 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 2. fc + 1 2 pR L C C (2) |
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Similar Description - TPA701_07 |
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