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| 型號： | TAS5112ADCAR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DIGITAL AMPLIFIER POWER STAGE |
| 中文描述： | 數(shù)字放大器功率級 |
| 文件頁數(shù)： | 13/21頁 |
| 文件大?。?/td> | 405K |
| 代理商： | TAS5112ADCAR |
SLES094A - OCTOBER 2003 - REVISED MARCH 2004
www.ti.com
13
Timing and Function
The function of the autorecovery circuit is as follows:
1.
An error event occurs and sets the
protection latch (output stage goes Hi-Z).
The counter is started.
After n/2 cycles, the protection latch is
cleared but the output stage remains Hi-Z
(identical to pulling RESET low).
After n cycles, operation is resumed
(identical to pulling RESET high) (n = 512).
2.
3.
4.
Error
Protection
Latch
Shutdown
Autorecovery
SD
PWM
Counter
AR-RESET
Figure 10. Autorecovery Function
Latching Shutdown on All Errors (PMODE1)
In latching shutdown mode, all error situations result in a
power down (output stage Hi-Z). Re-enabling can be done
by toggling the RESET pin.
All Protection Systems Disabled (PMODE2)
In PMODE2, all protection systems are disabled. This
mode is purely intended for testing and characterization
purposes and thus not recommended for normal device
operation.
MODE Pins Selection
The protection mode is selected by shorting M1/M2 to
DREG or DGND according to Table 2.
Table 2. Protection Mode Selection
M1
M2
PROTECTION MODE
0
0
Autorecovery after errors (PMODE 0)
0
1
Latching shutdown on all errors (PMODE 1)
1
0
All protection systems disabled (PMODE 2)
1
1
Reserved
The output configuration mode is selected by shorting the
M3 pin to DREG or DGND according to Table 3.
Table 3. Output Mode Selection
M3
OUTPUT MODE
0
Bridge-tied load output stage (BTL)
1
Reserved
APPLICATION INFORMATION
DEMODULATION FILTER DESIGN AND
SPIKE CONSIDERATIONS
The output square wave is susceptible to overshoots
(voltage spikes). The spike characteristics depend on
many elements, including silicon design and application
design and layout. The device should be able to handle
narrow spike pulses, less than 65 ns, up to 65 volts peak.
For more detailed information, see TI application note
SLEA025.
The PurePath Digital amplifier outputs are driven by
heavy-duty
DMOS
transistors
configuration. These transistors are either off or fully on,
which reduces the DMOS transistor on-state resistance,
R
DSon
, and the power dissipated in the device, thereby
increasing efficiency.
in
an
H-bridge
The result is a square-wave output signal with a duty cycle
that is proportional to the amplitude of the audio signal. It
is recommended that a second-order LC filter be used to
recover the audio signal. For this application, EMI is
considered important; therefore, the selected filter is the
full-output type shown in Figure 11.
Output A
C1A
TAS51xx
L
Output B
L
C1B
C2
R(Load)
Figure 11. Demodulation Filter
The main purpose of the output filter is to attenuate the
high-frequency switching component of the PurePath
Digital amplifier while preserving the signals in the audio
band.
Design of the demodulation filter affects the performance
of the power amplifier significantly. As a result, to ensure
proper operation of the overcurrent (OC) protection circuit
and meet the device THD+N specifications, the selection
of the inductors used in the output filter must be considered
according to the following. The rule is that the inductance
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| TAS5112ADCARG4 | 功能描述:音頻放大器 Digital Amp Power Stage 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TAS5112ADFD | 功能描述:音頻放大器 Digital Amp Power Stage 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TAS5112ADFDG4 | 功能描述:音頻放大器 Digital Amp Power Stage 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TAS5112ADFDR | 功能描述:音頻放大器 Digital Amp Power Stage 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TAS5112ADFDRG4 | 功能描述:音頻放大器 Digital Amp Power Stage 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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