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参数资料
| 型号： | TAS5414ATPHDMQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 116 W, 4 CHANNEL, AUDIO AMPLIFIER, PQFP64 |
| 封装： | GREEN, PLASTIC, HTQFP-64 |
| 文件页数： | 10/54页 |
| 文件大小： | 1386K |
| 代理商： | TAS5414ATPHDMQ1 |
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ShortDetected
OpenDetected
NormalLoadDetected
ShortDetection
Range
OpenDetection
Range
0.5
300
1.5
1300
1(Typ)
800(Typ)
R
(IncludingWires)
Load
M0067-01
SLOS535C
– MAY 2009 – REVISED APRIL 2011
Figure 14. Open and Shorted Load Detection
2. Tweeter Detection
— Tweeter detection is an alternate operating mode that is used to determine the proper
connection of a frequency dependent load (such as a speaker with a crossover). Tweeter detection is
invoked via I2C, and all four channels should be tested individually. Tweeter detection uses the average
cycle-by-cycle current limit circuit (see CBC section) to measure the current delivered to the load. The proper
implementation of this diagnostic function is dependent on the amplitude of a user-supplied test signal and
on the impedance versus frequency curve of the acoustic load. The system (external to the TAS5414A and
TAS5424A) must generate a signal to which the load will respond. The frequency and amplitude of this
signal must be calibrated by the user to result in a current draw that is greater than the tweeter detection
threshold when the load under test is present, and less than the detection threshold if the load is not properly
connected. The current level for the tweeter detection threshold, as well as the maximum current that can
safely be delivered to a load when in tweeter detection mode, can be found in the Electrical Characteristics
section of the datasheet. The tweeter detection results are reported on the CLIP_OTW pin during the
application of the test signal. When tweeter detection is activated (indicating that the tested load is present),
pulses on the CLIP_OTW pin begin to toggle. The pulses on the CLIP_OTW pins will report low whenever
the current detection threshold is exceeded, and the pin will remain low until the threshold is no longer
exceeded. The minimum low-pulse period that can be expected is equal to one period of the switching
frequency. Having an input signal that increases the amount of time that the detector is activated (e. g.
increasing the amplitude of the input signal) will increase the amount of time for which the pin reports low.
NOTE: Because tweeter detection is an alternate operating mode, the channels to be tested must be placed
in Play mode (via register 0x0C) after tweeter detection has been activated in order to commence the
detection process. Additionally, the CLIP_OTW pin must be set up via register 0x0A to report the results of
tweeter detection.
Protection and Monitoring
1. Cycle-By-Cycle Current Limit (CBC)
—The CBC current-limiting circuit terminates each PWM pulse to limit
the output current flow when the average current limit (ILIM) threshold is exceeded. The overall effect on the
audio in the case of a current overload is quite similar to a voltage-clipping event, where power is temporarily
limited at the peaks of the musical signal and normal operation continues without disruption when the
overload is removed. The TAS5414A and TAS5424A do not prematurely shut down in this condition. All four
channels continue in play mode and pass signal.
2. Overcurrent Shutdown (OCSD)
—Under severe short-circuit events, such as a short to PVDD or ground, a
peak-current detector is used, and the affected channel shuts down in 200
μs to 390 μs if the conditions are
severe enough. The shutdown speed depends on a number of factors, such as the impedance of the short
circuit, supply voltage, and switching frequency. Only the shorted channels are shut down in such a scenario.
18
Copyright
2009–2011, Texas Instruments Incorporated
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| TAS5414ATPHDMQ1G4 | 功能描述:音频放大器 4 Channel Auto Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TAS5414ATPHDQ1 | 功能描述:音频放大器 4Ch Auto Dig Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TAS5414ATPHDQ1G4 | 功能描述:音频放大器 4 Channel Auto Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TAS5414ATPHDRMQ1 | 功能描述:音频放大器 4Ch Auto Dig Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TAS5414ATPHDRMQ1G4 | 功能描述:音频放大器 4 Channel Auto Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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