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| 型號： | TDA8933BTW/N2,512 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO32 |
| 封裝： | 6.10 MM, 0.65 MM PITCH, PLASTIC, SOT-249-1, HTSSOP-32 |
| 文件頁數(shù)： | 42/42頁 |
| 文件大?。?/td> | 245K |
| 代理商： | TDA8933BTW/N2,512 |
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TDA8933B_1
NXP B.V. 2008. All rights reserved.
Preliminary data sheet
Rev. 01 — 23 October 2008
9 of 42
NXP Semiconductors
TDA8933B
Class D audio amplier
This means that the device will not switch off completely, but remains operational at lower
output power levels. With music output signals, this feature enables high peak output
powers while still operating without any external heat sink other than the copper area on
the Printed-Circuit Board (PCB).
If the junction temperature still increases due to external causes the OTP shuts down the
amplier completely.
8.4.2 OverTemperature Protection (OTP)
If the junction temperature Tj > 155 °C the power stage will shut down immediately.
8.4.3 OverCurrent Protection (OCP)
The OCP can distinguish between an impedance drop of the loudspeaker and a
low-ohmic short circuit.
If an impedance drop causes the output current to exceed 2 A, e.g. due to dynamic
behavior of the loudspeaker, the amplier will start limiting the current above 2 A.
Therefore the current limiting feature will avoid audio interruption (audio holes) due to a
loudspeaker impedance drop.
If a fault condition causes the output current to exceed 2 A, like a short circuit between the
loudspeaker terminals or from the loudspeaker terminal to the supply lines or ground, the
amplier is switched off and a timer of 100 ms is started. The DIAG is set low for the rst
50 ms of the timer. The timer will keep the power stage disabled for at least 100 ms.
Every 100 ms the amplier will try to restart as long as the short circuit between the
loudspeaker terminals remains. The average power dissipation in the TDA8933B will be
low because the short circuit current will ow only during a very short time every 100 ms.
If a short circuit occurs between a loudspeaker terminal and the supply lines or ground,
the activated WP will keep the power stage disabled (no restart every 100 ms). Restart
will take place after removing this short.
8.4.4 Window Protection (WP)
The window protection protects the amplier against the following fault conditions:
During the start-up sequence, when pin POWERUP is switched from Sleep mode to
Mute mode. In the event of a short circuit at one of the output terminals to VDDP1,
VSSP1, VDDP2 or VSSP2 the start-up procedure is interrupted and the TDA8933B waits
for open circuit outputs. Because the check is done before enabling the power stages
no large currents will ow in the event of a short circuit.
When the amplier is shut down completely due to activation of the OCP or because
of a short circuit to one of the supply lines, then during restart (i.e. after 100 ms) the
window protection will be activated. As a result the amplier will not start up until the
short circuit to the supply lines has been removed.
8.4.5 Supply voltage protection
If the supply voltage drops below 10 V the UnderVoltage Protection (UVP) circuit is
activated and the system will shut down directly. This switch-off will be silent and without
pop noise. When the supply voltage rises above the threshold level the power stage is
restarted after 100 ms.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA8933T | 功能描述:音頻放大器 2X10W BTL CLASS D AMP+VOLCTRL 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 |
| TDA8933T/N1,112 | 功能描述:音頻放大器 2X10W BTL CLASS D 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 |
| TDA8933T/N1,118 | 功能描述:音頻放大器 2X10W BTL CLASS D 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 |
| TDA8933T-T | 功能描述:音頻放大器 2X10W BTL CLASS D AMP+VOLCTRL 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 |
| TDA8939 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Zero dead time Class-D 7.5 A power comparator |
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