參數(shù)資料
型號(hào)： TDA8932TW
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 音頻／視頻放大
英文描述： 25 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO32
封裝： 6.10 MM, 0.65 MM PITCH, PLASTIC, MO-153, SOT549-1, HTSSOP-32
文件頁(yè)數(shù)： 45/45頁(yè)
文件大?。?/td> 285K
代理商： TDA8932TW
TDA8932_1
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Preliminary data sheet
Rev. 01 — 11 May 2006
9 of 45
Philips Semiconductors
TDA8932
Class-D audio amplier
8.4 Protections
The following protections are included in the TDA8932:
Thermal Foldback (TF)
OverTemperature Protection (OTP)
OverCurrent Protection (OCP)
Window Protection (WP)
Supply voltage protections:
– UnderVoltage Protection (UVP)
– OverVoltage Protection (OVP)
– UnBalance Protection (UBP)
ESD
The reaction of the device on the different fault conditions differs per protection.
8.4.1 Thermal Foldback (TF)
If the junction temperature of the TDA8932 exceeds the threshold level (Tj > 140 °C) the
gain of the amplier is decreased gradually to a level were the combination of dissipation
(P) and the thermal resistance from junction to ambient [Rth(j-a)] results into a junction
temperature around the threshold level.
This means that the device will not completely switch off, but remains operational at lower
output power levels. Especially with music output signals this feature enables high peak
output powers while still operating without any external heat sink other than the
printed-circuit board area.
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, then the power stage will shutdown immediately.
8.4.3 OverCurrent Protection (OCP)
When the loudspeaker terminals are short-circuited or if one of the demodulated outputs
of the amplier is short-circuited to one of the supply lines, this will be detected by the
OCP.
If the output current exceeds the maximum output current (IO(ocp) > 4 A), this current will
be limited by the amplier to 4 A while the amplier outputs remain switching (the amplier
is NOT shutdown completely). This is called current limiting.
The amplier can distinguish between an impedance drop of the loudspeaker and a
low-ohmic short-circuit across the load or to one of the supply lines. This impedance
threshold depends on the supply voltage used:
In case of a short-circuit across the load, the audio amplier is switched off completely
and after approximately 100 ms it will try to restart again. If the short-circuit condition
is still present after this time, this cycle will be repeated. The average dissipation will
be low because of this low duty cycle.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA8933 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Class-D audio amplifier
TDA8933B 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Class D audio amplifier
TDA8933BTW 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Class D audio amplifier
TDA8933BTW/N2,112 功能描述:音頻放大器 Class D audio amplifier 32 leads RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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
TDA8933BTW/N2,118 功能描述:音頻放大器 Class D audio amplifier 32 leads RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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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