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參數(shù)資料
| 型號： | TPA6211A1TDGNRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | AUDIO AMPLIFIER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 9/22頁 |
| 文件大小： | 424K |
| 代理商： | TPA6211A1TDGNRQ1 |
fc +
1
2p R
L
C
V
(rms) +
V
O(PP)
2 2
Power +
V
(rms)
2
R
L
RL
CC
VO(PP)
VDD
-3 dB
fc
RL
2x VO(PP)
VO(PP)
-VO(PP)
VDD
SBOS555
– JUNE 2011
works best. For filtering lower frequency noise
bridging raises the power into an 8-
speaker from a
signals, a 10-
μF or greater capacitor placed near the
singled-ended (SE, ground reference) limit of 200
audio power amplifier also helps, but is not required
mW to 800 mW. This is a 6-dB improvement in sound
in most applications because of the high PSRR of this
power
—loudness that can be heard. In addition to
device.
increased
power,
there
are
frequency-response
concerns.
Consider
the
single-supply
SE
configuration
shown
in
34.
A
coupling
USING LOW-ESR CAPACITORS
capacitor (CC) is required to block the dc-offset
Low-ESR capacitors are recommended throughout
voltage from the load. This capacitor can be quite
this applications section. A real (as opposed to ideal)
large (approximately 33
μF to 1000 μF) so it tends to
capacitor can be modeled simply as a resistor in
be expensive, heavy, occupy valuable PCB area, and
series with an ideal capacitor. The voltage drop
have
the
additional
drawback
of
limiting
across this resistor minimizes the beneficial effects of
low-frequency performance. This frequency-limiting
the capacitor in the circuit. The lower the equivalent
effect is due to the high-pass filter network created
value of this resistance the more the real capacitor
with
the
speaker
impedance
and
the
coupling
behaves like an ideal capacitor.
capacitance. This is calculated with Equation 13.
DIFFERENTIAL OUTPUT VERSUS
SINGLE-ENDED OUTPUT
(13)
Figure 33 shows a Class-AB audio power amplifier
For example, a 68-
μF capacitor with an 8- speaker
(APA)
in
a
fully
differential
configuration.
The
would attenuate low frequencies below 293 Hz. The
TPA6211A1-Q1 amplifier has differential outputs
BTL configuration cancels the dc offsets, which
driving both ends of the load. One of several potential
eliminates the need for the blocking capacitors.
benefits to this configuration is power to the load. The
Low-frequency performance is then limited only by
differential drive to the speaker means that as one
the input network and speaker response. Cost and
side is slewing up, the other side is slewing down,
PCB space are also minimized by eliminating the
and vice versa. This in effect doubles the voltage
bulky coupling capacitor.
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 Equation 12.
(12)
Figure 34. Single-Ended Output and Frequency
Response
Increasing power to the load does carry a penalty of
increased internal power dissipation. The increased
dissipation is understandable considering that the
BTL configuration produces 4
× the output power of
the SE configuration.
Figure 33. Differential Output Configuration
In a typical wireless handset operating at 3.6 V,
Copyright
2011, Texas Instruments Incorporated
17
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