參數(shù)資料
型號(hào)： TPA711DR
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： Single Audio Amplifier
中文描述： 單音頻放大器
文件頁(yè)數(shù)： 23/32頁(yè)
文件大?。?/td> 522K
代理商： TPA711DR
TPA711
700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
SLOS230C
–
NOVEMBER 1998
–
REVISED APRIL 2001
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
application schematic
Figure 51 is a schematic diagram of a typical handheld audio application circuit, configured for a gain of
–
10 V/V.
Audio
Input
Bias
Control
VDD
6
5
7
VO+
VDD
3
1
2
4
BYPASS
IN
SE/BTL
VDD/2
CI
0.47
μ
F
RI
10 k
CS
1
μ
F
CB
2.2
μ
F
RF
50 k
SHUTDOWN
VO
–
8
GND
From System Control
CF
5 pF
CC
330
μ
F
1 k
100 k
VDD
100 k
–
+
–
+
0.1
μ
F
Figure 51. TPA711 Application Circuit
The following sections discuss the selection of the components used in Figure 51.
component selection
gain setting resistors, R
F
and R
I
The gain for each audio input of the TPA711 is set by resistors R
F
and R
I
according to equation 5 for BTL mode.
(5)
BTL gain
2
RF
RI
BTL mode operation brings about the factor 2 in the gain equation due to the inverting amplifier mirroring the
voltage swing across the load. Given that the TPA711 is a MOS amplifier, the input impedance is very high;
consequently input leakage currents are not generally a concern, although noise in the circuit increases as the
value of R
F
increases. In addition, a certain range of R
F
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 6.
(6)
Effective impedance
RFRI
RF
RI
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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TPA711EVM 制造商:TI 制造商全稱:Texas Instruments 功能描述:700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
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