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參數(shù)資料
| 型號： | TPA0312PWPR |
| 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)： | 22/36頁 |
| 文件大?。?/td> | 791K |
| 代理商： | TPA0312PWPR |
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PC-BEEP OPERATION
C
PCB w
1
2p
PCB
(100 kW)
(14)
SHUTDOWN MODES
TPA0312
SLOS335A – DECEMBER 2000 – REVISED OCTOBER 2004
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 activated automatically. When the PC-BEEP input is active,
both 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 returns to the previous
operating mode and volume setting. Furthermore, if the amplifier is in shutdown mode, activating PC-BEEP takes
the device out of shutdown, outputs the PC-BEEP signal, then returns the amplifier to shutdown mode.
The preferred input signal is a square wave or pulse train. To be accurately detected, the signal must have a
minimum of 1.5-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 returns to its previous operating mode and volume setting.
To ac-couple the PC-BEEP input, choose a coupling-capacitor value to satisfy Equation 14:
The PC-BEEP input can also be dc-coupled to avoid using this coupling capacitor. The pin normally rests at
midrail when no signal is present.
The TPA0312 employs a shutdown mode of operation designed to reduce supply current, IDD, to the absolute
minimum level during periods of nonuse for battery-power conservation. The SHUTDOWN input terminal should
be held high during normal operation when the amplifier is in use. Pulling SHUTDOWN low causes the outputs to
mute and the amplifier to enter a low-current state, IDD = 150 A. SHUTDOWN should never be left unconnected
because amplifier operation would be unpredictable.
Table 6. HP/LINE, SE/BTL, AND SHUTDOWN FUNCTIONS
INPUTS(1)
AMPLIFIER STATE
HP/LINE
SE/BTL
SHUTDOWN
INPUT
OUTPUT
X(2)
Low
X(2)
Mute
Low
High
Line
BTL
Low
High
Line
SE
High
Low
High
HP
BTL
High
HP
SE
(1)
Inputs should never be left unconnected.
(2)
X = do not care
29
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| TPA0312PWPRG4 | 功能描述:音頻放大器 St 2W Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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| TPA032D01DCA | 制造商:Texas Instruments 功能描述:IC SM POWER AMP CLASS-D AUDIO |
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