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參數(shù)資料
| 型號： | TDA7850H |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 80 W, 4 CHANNEL, AUDIO AMPLIFIER, ZFM25 |
| 封裝： | ROHS COMPLIANT, FLEXIWATT-25 |
| 文件頁數(shù)： | 6/18頁 |
| 文件大?。?/td> | 386K |
| 代理商： | TDA7850H |
Application hints
TDA7850
4
Application hints
Referred to the circuit of Figure 2.
4.1
SVR
Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF
time sequence and, consequently, plays an essential role in the pop optimization during
ON/OFF transients. To conveniently serve both needs, Its minimum recommended value
is 10F.
4.2
Input stage
The TDA7850's inputs are ground-compatible and can stand very high input signals (±
8Vpk) without any performance degradation.
If the standard value for the input capacitors (0.1F) is adopted, the low frequency cut-off
will amount to 16 Hz.
4.3
Standby and muting
Standby and Muting facilities are both CMOS compatible. In absence of true CMOS ports or
microprocessors, a direct connection to Vs of these two pins is admissible but a 470k
Ω
equivalent resistance should be present between the power supply and the muting and
ST-BY pins.
R-C cells have always to be used in order to smooth down the transitions for preventing any
audible transient noises.
About the standby, the time constant to be assigned in order to obtain a virtually pop-free
transition has to be slower than 2.5 V/ms.
4.4
DC offset detector
The TDA7850 integrates a DC offset detector to avoid that an anomalous DC offset on the
inputs of the amplifier may be multiplied by the gain and result in a dangerous large offset on
the outputs which may lead to speakers damage for overheating. The feature is enabled by
the MUTE pin (according to table 3) and works with the amplifier unmuted and with no signal
on the inputs.
The DC offset detection is signaled out on the HSD pin. To ensure the correct functionality of
the Offset Detector it is necessary to connect a pulldown 10 kW resistor between HSD and
ground.
4.5
Heatsink definition
Under normal usage (4 Ohm speakers) the heatsink's thermal requirements have to be
deduced from Figure 18, which reports the simulated power dissipation when real
music/speech programmes are played out. Noise with gaussian-distributed amplitude was
employed for this simulation. Based on that, frequent clipping occurrence (worst-case) will
cause Pdiss = 26 W. Assuming Tamb = 70 °C and TCHIP = 150 °C as boundary conditions, the
heatsink's thermal resistance should be approximately 2°C/W. This would avoid any thermal
shutdown occurrence even after long-term and full-volume operation.
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| TDA7851 | 功能描述:音頻放大器 4 x 50 W MOSFET Quad Bridge Pwr Amplifier 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 |
| TDA7851A | 功能描述:音頻放大器 4 x 50 W MOSFET Quad Bridge Pwr Amplifier 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 |
| TDA7851F | 功能描述:音頻放大器 4 x 50 W MOSFET Quad Bridge Pwr Amplifier 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 |
| TDA7851L | 功能描述:音頻放大器 4 x 50 W MOSFET Quad Bridge Pwr Amplifier 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 |
| TDA7851L_ | 制造商:SAMES 制造商全稱:SAMES 功能描述: |
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