參數(shù)資料
型號(hào)： TDA7350A
廠商： STMICROELECTRONICS
元件分類(lèi)： 音頻／視頻放大
英文描述： 11 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM11
文件頁(yè)數(shù)： 6/23頁(yè)
文件大小： 494K
代理商： TDA7350A
TDA7350A
14/23
4.9 BUILT-IN PROTECTION SYSTEMS
4.9.1 Short Circuit Protection
The maximum current the device can deliver can be calculated by considering the voltage that may be
present at the terminals of a car radio amplifier and the minimum load impedance.
Apart from consideration concerning the area of the power transistors it is not difficult to achieve peak cur-
rents of this magnitude (5A peak).
However, it becomes more complicated if AC and DC short circuit protection is also required.In particular,
with a protection circuit which limits the output current following the SOA curve of the output transistors it
is possible that in some conditions (highly reactive loads, for example) the protection circuit may intervene
during normal operation. For this reason each amplifier has been equipped with a protection circuit that
intervenes when the output current exceeds 4A.
Fig 37 shows the protection circuit for an NPN power transistor (a symmetrical circuit applies to PNP).The
VBE of the power is monitored and gives out a signal,available through a cascode.
This cascode is used to avoid the intervention of the short circuit protection when the saturation is below
a given limit.
The signal sets a flip-flop which forces the amplifier outputs into a high impedance state.
In case of DC short circuit when the short circuit is removed the flip-flop is reset and restarts the circuit
(fig. 41). In case of AC short circuit or load shorted in Bridge configuration, the device is continuously
switched in ON/OFF conditions and the current is limited.
Figure 37. Circuitry for Short Circuit Detection
4.9.2 Load Dump Voltage Surge
The TDA7350A has a circuit which enables it to withstand a voltage pulse train on pin 9, of the type shown
in fig. 39.
If the supply voltage peaks to more than 40V, then an LC filter must be inserted between the supply and
pin 9, in order to assure that the pulses at pin 9 will be held within the limits shown.
A suggested LC network is shown in fig. 38. With this network, a train of pulses with amplitude up to 120V
and width of 2ms can be applied at point A. This type of protection is ON when the supply voltage (pulse
or DC) exceeds 18V. For this reason the maximum operating supply voltage is 18V.
Figure 38.
相關(guān)PDF資料
PDF描述
TDA7350 22 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM11
TDA7370BV 6.5 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM15
TDA7370B 6.5 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM15
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7350A_05 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:22W BRIDGE-STEREO AMPLIFIER FOR CAR RADIO
TDA7360 功能描述:音頻放大器 22W Stereo Amplifier 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
TDA7360HS 功能描述:音頻放大器 18V Op 28V DC 36W 50V Supply 5A Output 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
TDA7361 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:LOW VOLTAGE NBFM IF SYSTEM
TDA7365 功能描述:音頻放大器 2X7W Radio Amplifier 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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