參數(shù)資料
型號(hào)： TPA321DR
元件分類(lèi)： 音頻放大器
英文描述： Single Audio Amplifier
中文描述： 單音頻放大器
文件頁(yè)數(shù)： 18/22頁(yè)
文件大小： 424K
代理商： TPA321DR
TPA321
350-mW MONO AUDIO POWER AMPLIFIER
WITH DIFFERENTIAL INPUTS
SLOS312A – JUNE 2000 – REVISED JUNE 2000
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
midrail bypass capacitor, C
B
The midrail bypass capacitor, C
B
, is the most critical capacitor and serves several important functions. During
start-up or recovery from shutdown mode, C
B
determines the rate at which the amplifier starts up. The second
function is to reduce noise produced by the power supply caused by coupling into the output drive signal. This
noise is from the midrail generation circuit internal to the amplifier, which appears as degraded PSRR and THD
+ N. The capacitor is fed from a 250-k
source inside the amplifier. To keep the start-up pop as low as possible,
the relationship shown in equation 10 should be maintained, which insures the input capacitor is fully charged
before the bypass capacitor is fully charged and the amplifier starts up.
(10)
10
250 k
CB
1
RF
RI
CI
As an example, consider a circuit where C
B
is 2.2
μ
F, C
I
is 0.47
μ
F, R
F
is 50 k
and R
I
is 10 k
. Inserting these
values into the equation 10 we get:
18.2
35.5
which satisfies the rule. Bypass capacitor, C
B
, values of 2.2
μ
F to 1
μ
F ceramic or tantalum low-ESR capacitors
are recommended for the best THD and noise performance.
using low-ESR capacitors
Low-ESR capacitors are recommended throughout this application. A real (as opposed to ideal) capacitor can
be modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this resistor minimizes
the beneficial effects of the capacitor in the circuit. The lower the equivalent value of this resistance, the more
the real capacitor behaves like an ideal capacitor.
5-V versus 3.3-V operation
The TPA321 operates over a supply range of 2.5 V to 5.5 V. This data sheet provides full specifications for 5-V
and 3.3-V operation, as these are considered to be the two most common standard voltages. There are no
special considerations for 3.3-V versus 5-V operation with respect to supply bypassing, gain setting, or stability.
The most important consideration is that of output power. Each amplifier in TPA321 can produce a maximum
voltage swing of V
DD
– 1 V. This means, for 3.3-V operation, clipping starts to occur when V
O(PP)
= 2.3 V as
opposed to V
O(PP)
= 4 V at 5 V. The reduced voltage swing subsequently reduces maximum output power into
an 8-
load before distortion becomes significant.
Operation from 3.3-V supplies, as can be shown from the efficiency formula in equation 4, consumes
approximately two-thirds the supply power for a given output-power level than operation from 5-V supplies.
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