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TPA721 Datasheet(PDF) 12 Page - Texas Instruments

Part No. TPA721
Description  700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
Download  28 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPA721 Datasheet(HTML) 12 Page - Texas Instruments

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APPLICATION INFORMATION
BRIDGE-TIED LOAD
Power +
V
(RMS)
2
R
L
V
(RMS) +
V
O(PP)
2 2
(1)
RL
2x VO(PP)
VO(PP)
–VO(PP)
VDD
VDD
f
(corner) +
1
2p R
L
C
C
(2)
TPA721
SLOS231E – NOVEMBER 1998 – REVISED JUNE 2004
Figure 23 shows a linear audio power amplifier (APA) in a BTL configuration. The TPA721 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
× V
O(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).
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-
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.
For example, a 68-µF capacitor with an 8-
Ω speaker would attenuate low frequencies below 293 Hz. The BTL
configuration cancels the dc offsets, which eliminates the need for the blocking capacitors. Low-frequency
performance is then limited only by the input network and speaker response. Cost and PCB space are also
minimized by eliminating the bulky coupling capacitor.
12


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