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參數(shù)資料
型號: TPA0122PWP
廠商: Texas Instruments, Inc.
元件分類: 音頻放大器
英文描述: CONNECTOR ACCESSORY
中文描述: 連接器附件
文件頁數(shù): 30/34頁
文件大小: 534K
代理商: TPA0122PWP
TPA0122
2-W STEREO AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS
SLOS247B – JUNE 1999 – REVISED MARCH 2000
30
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
SE/BTL operation
The ability of the TPA0122 to easily switch between BTL and SE modes is one of its most important cost saving
features. This feature eliminates the requirement for an additional headphone amplifier in applications where
internal stereo speakers are driven in BTL mode but external headphone or speakers must be accommodated.
Internal to the TPA0122, two separate amplifiers drive OUT+ and OUT–. The SE/BTL input (terminal 15)
controls the operation of the follower amplifier that drives LOUT– and ROUT– (terminals 9 and 16). When
SE/BTL is held low, the amplifier is on and the TPA0122 is in the BTL mode. When SE/BTL is held high, the OUT–
amplifiers are in a high output impedance state, which configures the TPA0122 as an SE driver from LOUT+
and ROUT+ (terminals 4 and 21). I
DD
is reduced by approximately one-half in SE mode. Control of the SE/BTL
input can be from a logic-level CMOS source or, more typically, from a resistor divider network as shown in
Figure 47.
ROUT+
21
R
MUX
RHPIN
RLINEIN
+
23
20
8
RIN
ROUT–
16
+
1 k
COUTR
330
μ
F
100 k
SE/BTL
15
100 k
VDD
Figure 47. TPA0122 Resistor Divider Network Circuit
Using a readily available 1/8-in. (3.5 mm) stereo headphone jack, the control switch is closed when no plug is
inserted. When closed the 100-k
/1-k
divider pulls the SE/BTL input low. When a plug is inserted, the 1-k
resistor is disconnected and the SE/BTL input is pulled high. When the input goes high, the OUT– amplifier is
shutdown causing the speaker to mute (virtually open-circuits the speaker). The OUT+ amplifier then drives
through the output capacitor (C
O
) into the headphone jack.
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