參數(shù)資料
型號(hào)： TDA7493
廠商： STMICROELECTRONICS
元件分類： 音頻／視頻放大
英文描述： 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24
封裝： ROHS COMPLIANT, MO-153ADT, SSOP-24
文件頁(yè)數(shù)： 5/30頁(yè)
文件大小： 863K
代理商： TDA7493
TDA7493
Application information
Doc ID 14570 Rev 5
13/30
5.4
Filterless modulation
The modulation scheme of BTL is called unipolar PWM output. The differential output
voltage changes between zero and +VCC or between zero and -VCC, as opposed to the
traditional bipolar PWM output between +VCC and -VCC. The other advantage of this
scheme effectively doubles the switching frequency of the differential output waveform.
Signals on OUTP and OUTN are in the same phase when the input is zero, thus the current
is greatly reduced and the loss in the load is small. A tiny delay between OUTP and OUTN is
introduced to avoid high transient currents which could occur if both outputs switch
simultaneously.
TDA7493 can be used without a filter between the PWM output and the speaker since the
switching frequency of the output is beyond the audible range. The audio signal can be
recovered by the inherent inductance of the speaker and natural filter of the human ear.
Figure 6.
Unipolar PWM output
The filterless configuration is usable in applications where the speaker connections to the
amplifier are shorter than 50 cm. In comparison to the low-pass Butterworth filter
configuration, the filterless configuration gives rise to higher EMI. This can be reduced, if
necessary, by inserting a ferrite bead filters close to the device.
Use a ferrite which exhibits high impedance at around 1 MHz and negligible impedance in
the audio band.
It is recommended to use an EMI filter if the speaker cable is longer than 50 cm.
相關(guān)PDF資料
PDF描述
TDA7494 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, ZFM15
TDA7495 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PZFM15
TDA7496SA 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PZFM15
TDA7496SSA 5.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM15
TDA7498MVTR 100 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO36
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA749313TR 功能描述:音頻放大器 3W and 3Watt Dual BTL Class D Audio 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
TDA7494 功能描述:音頻放大器 10W DC Amp w/Vol Cnt 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
TDA7494S 功能描述:音頻放大器 Video switch chip 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
TDA7494SA 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5W+5W AMPLIFIER WITH DC VOLUME CONTROL
TDA7495 功能描述:音頻放大器 11W DC Amp w/Vol Cnt 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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