參數(shù)資料
型號(hào): TPA6030A4PWP
廠(chǎng)商: TEXAS INSTRUMENTS INC
元件分類(lèi): 音頻控制
英文描述: 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28
封裝: GREEN, PLASTIC, TSSOP-28
文件頁(yè)數(shù): 8/32頁(yè)
文件大小: 698K
代理商: TPA6030A4PWP
TPA6030A4
SLOS395B DECEMBER 2002 REVISED JANUARY 2005
www.ti.com
16
APPLICATION CIRCUIT
Application circuit using the TPA6030A4 in an LCD monitor with headphone outputs and volume control.
1 k
TPA6030A4PWP
10
11
12
14
13
Rout
PVcc
SEMAX
RIN1
RIN1+
RIN2
RIN2+
Vcc
LIN1
LIN1+
LIN2
LIN2+
NC
Lout
1
2
3
15
16
18
19
20
21
22
25
23
26
27
28
GND
Rout +
SE/BTL
IN2/IN1
SHUTDOWN
VOLUME
SEDIFF
CLK
GND
BYPASS
PVcc
Lout +
GND
4
5
6
7
8
9
5VREG
17
24
C1
C2
C3
C4
C5
C6
C7
C8
C11
C13
+
C13
C11
+
C9
C10
47 nF
System
Control
C15
SEDIFF
VOLUME
R1
R2
SEMAX
R7
R6
C14
R5
R4
RIN1
RIN1+
RIN2
RIN2+
LIN1
LIN1+
LIN2
LIN2+
R8
C12
10 F1 F
33 k
0.47 F
100 k
220 F
100 k
1 F
100 k
82 k
1 F
10 F
1 k
220 F
R2
18 k
R9
68 k
0.47 F
VCC
+
Figure 22. Typical Application Circuit for an LCD Monitor
Volume Control Description
The circuit shown in Figure 22 automatically switches between headphone outputs and speaker outputs when a
headphone plug is inserted or removed from the headphone jack. Additionally, this circuit uses resistor divider networks
to limit the headphone volume. Resistors R8 and R9 form a divider network that applies 67% of 5VREF to the SEMAX
pin, which results in a maximum output of 7.2 dB. Resistors R2 and R3 form a divider network that applies 18% of 5VREF
to the SEDIFF pin.
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