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參數(shù)資料
| 型號： | TPA302DR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.3 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 8/25頁 |
| 文件大?。?/td> | 623K |
| 代理商： | TPA302DR |
www.ti.com
APPLICATION INFORMATION
SELECTION OF COMPONENTS
Audio
Input
Bias
Control
VDD = 5 V
6
1
5
7
VO1
VO2
VDD
2
8
3
4
IN 1
BYPASS
SHUTDOWN (see Note A)
VDD/2
CI
RI
RF
CF
50 k
50 k
CB
CS
NOTE A: SHUTDOWN must be held low for normal operation and asserted high for shutdown mode.
Audio
Input
CI
RI
IN 2
RF
CF
RL
CC
Gain Setting Resistors, RF and RI
Gain + *
R
F
R
I
(1)
Effective Impedance +
R
FRI
R
F ) RI
(2)
TPA302
SLOS174C – JANUARY 1997 – REVISED JUNE 2004
Figure 42 is a schematic diagram of a typical application circuit.
Figure 42. TPA302 Typical Notebook Computer Application Circuit
The gain for the TPA302 is set by resistors RF and RI according to Equation 1.
Given that the TPA302 is an MOS amplifier, the input impedance is high; consequently, input leakage currents
are not generally a concern, although noise in the circuit increases as the value of RF increases. In addition, a
certain range of RF values is required for proper start-up operation of the amplifier. Taken together, it is
recommended that the effective impedance seen by the inverting node of the amplifier be set between 5 k
and
20 k
. The effective impedance is calculated in Equation 2.
As an example, consider an input resistance of 10 k
and a feedback resistor of 50 k. The gain of the amplifier
would be –5 and the effective impedance at the inverting terminal would be 8.3 k
, which is within the
recommended range.
16
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