參數(shù)資料
型號： TPA0172PWPRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻控制
英文描述： 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
封裝： GREEN, PLASTIC, HTSSOP-24
文件頁數(shù)： 16/36頁
文件大?。?/td> 885K
代理商： TPA0172PWPRG4
TPA0172
2W STEREO AUDIO POWER AMPLIFIER
WITH I2C BUS
SLOS327C AUGUST 2000 REVISED MAY 2001
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
SE/BTL operation (continued)
Using a 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 shut down
causing the speaker to mute (virtually open-circuits the speaker). The OUT+ amplifier then drives through the
output capacitor (CO) into the headphone jack.
PC-BEEP operation
The PC-BEEP input allows a system beep to be sent directly from a computer through the amplifier to the
speakers with few external components. The input is normally activated automatically but may be selected
manually through the I2C interface. Refer to the I2C interface section. When the PC-BEEP input is active, both
of the LINEIN and HPIN inputs are deselected and both the left and right channels are driven in BTL mode with
the signal from PC-BEEP. The gain from the PC-BEEP input to the speakers is fixed at 0.3 V/V and is
independent of the volume setting. When the PC-BEEP input is deselected, the amplifier will return to the
previous operating mode and volume setting. Furthermore, if the amplifier is in shutdown mode, activating
PC-BEEP will take the device out of shutdown and output the PC-BEEP signal, and then return the amplifier
to shutdown mode.
In auto-detect mode, the amplifier will automatically switch to PC-BEEP mode after detecting a valid signal at
the PC-BEEP input. The preferred input signal is a square wave or pulse train with an amplitude of 1 Vpp or
greater. To be accurately detected, the signal must have a minimum of 1-Vpp amplitude, rise and fall times of
less than 0.1
s, and a minimum of eight rising edges. When the signal is no longer detected, the amplifier will
return to its previous operating mode and volume setting.
When manually selected, the PC-BEEP input is selected, and the LINEIN and HPIN inputs are deactivated
regardless of the input signal.
If it is desired to ac couple the PC-BEEP input, the value of the coupling capacitor should be chosen to satisfy
the following equation:
(14)
C
PCB w
1
2
p f
PCB
(100 k
W)
The PC-BEEP input can also be dc coupled to avoid using this coupling capacitor. The pin normally sits at midrail
when no signal is present.
相關(guān)PDF資料
PDF描述
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