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参数资料
| 型号： | TA0102A |
| 厂商： | Electronic Theatre Controls, Inc. |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEREO 150W (4з) CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER USING DIGITAL POWER PROCESSING (DPPTM) TECHNOLOGY |
| 中文描述： | 立体声150瓦（4з）类- T的数字音频放大器驱动程序使用数字功率处理（DPPTM）科技 |
| 文件页数： | 11/12页 |
| 文件大小： | 235K |
| 代理商： | TA0102A |
Tripath Technology, Inc. - Technical Information
11 TA0102A, Rev. 3.1/06.01
Application Information
Amplifier Gain and Input Resistor Selection
The value of the input resistor, R
IN
, is based on the required voltage gain, A
V
, of the amplifier
according to:
A
V
= 387 x10
3
/(R
IN
+ 5000)
where R
IN
= Input resistor value in ohms.
Input Capacitor Selection
C
IN
can be calculated once a value for R
IN
has been determined. C
IN
and R
IN
determine the input
low-frequency pole. Typically this pole is set at 10Hz. C
IN
is calculated according to:
C
IN
= 1/((2
π
x f
P
)(R
IN
+ 5000))
where:
R
IN
= Input resistor value in ohms.
f
P
= Input low frequency pole (typically 10Hz).
DC Offset Adjust
While the DC offset voltages that appear at the speaker terminals of a TA0102A amplifier are
typically small, Tripath recommends that any offsets during operation be nulled out of the amplifier
with a circuit like the one shown connected to IN1 and IN2 in the Test/Application Circuit. Nulling
should be performed with the inputs shorted to ground.
It should be noted that even after nulling, the DC voltage on the output of a TA0102A amplifier with
no load in mute mode is approximately 2.5V. This offset does not need to be nulled. The output
impedance of the amplifier in mute mode is approximately 10 KOhms. This means that the 2.5V
drops to essentially zero when a typical load is connected.
Supply Voltage and Output Power
The relationship between the bipolar power supply voltage needed, V
S
, for a given RMS output
power, P
OUT
, into a given load, R
L
, at a given level of THD (total harmonic distortion) is approximated
by:
V
S
= (2 x R
L
x P
OUT
)
0.5
/(K x R
L
/(R
L
+ R
ON
+ R
S
+ R
COIL
))
where:
R
ON
= The at-temperature R
DSON
of the output transistors, M.
R
COIL
= Resistance of the output filter inductor.
R
S
= Sense Resistor
K = THD Factor, a number fixed by the algorithms in the TA0102A’s signal processor that
provides the relationship between THD
at full output power
of the amplifier and V
S
. K
corresponds to THD at full output power as follows:
THD
K
0.1%
0.83
1%
0.95
10%
1.09
Typical measurement graphs of P
OUT
versus supply voltage for various levels of THD are also
included in this data sheet to help determine the supply voltage.
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|---|---|
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