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參數(shù)資料
| 型號(hào)： | TDA7360 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 22W Bridge / Stereo Audio Amplifier with Clipping Detector(22W橋式立體聲音頻放大器帶限幅檢測(cè)器) |
| 中文描述： | 22W橋/立體聲音頻放大器裁剪探測(cè)器（22W橋式立體聲音頻放大器帶限幅檢測(cè)器） |
| 文件頁(yè)數(shù)： | 14/22頁(yè) |
| 文件大?。?/td> | 225K |
| 代理商： | TDA7360 |
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BUILT-IN PROTECTION SYSTEMS
Short Circuit Protection
The maximum current the device can deliver can
be calculatedby considering the voltage that may
be present at the terminalsof a car radio amplifier
and the minimumload impedance.
Apart from consideration concerning the area of
the power transistors it is not difficult to achieve
peak currents of this magnitude(5 A peak).
However, it becomesmore complicated if AC and
DC short circuit protection is also required.In par-
ticular, with a protection circuit which limits the
output current following the SOA curve of the out-
put transistors it is possible that in some condi-
tions (highly reactive loads, for example) the pro-
tection circuit
may intervene during normal
operation. For this reason each amplifier has
been equipped with a protection circuit that inter-
venes when the outputcurrent exceeds 4A
Fig 35 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,availablethrough 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 setsa flip-flopwhich forces the amplifier
outputsinto ahighimpedancestate.
In case of DC short circuit when the short circuit
is removed the flip-flop is reset and restarts the
circuit (fig. 39). In case of AC short circuit or load
shorted in Bridge configuration,the device is con-
tinuously switched in ON/OFF conditions and the
current is limited.
Figure35:
Circuitry for Short Circuit Detection
Figure 34:
AmplifierBlock Diagram
Figure 33:
AClassical Output Stage
TDA7360
14/22
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