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TDA7803A bảng dữ liệu(PDF) 30 Page - STMicroelectronics

tên linh kiện TDA7803A
Giải thích chi tiết về linh kiện  High efficiency digital input automotive quad power amplifier with built-in diagnostics features, start stop compatible
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TDA7803A bảng dữ liệu(HTML) 30 Page - STMicroelectronics

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Functional description
TDA7803A
30/72
DS12195 Rev 7
only the channel(s) where the fault happened is shut down. Once activated, the
diagnostic procedure develops as below:
–
The diagnostic performs one restart cycle in order to avoid momentary re-
circulation spikes which could give erroneous results. If a normal state (no
overloads) is detected, the channel returns back active.
–
Instead, if after the restart cycle, the overload is still detected, then the diagnostic
performs a plateau cycle.
–
After the plateau cycle, a restart cycle is going to be performed every 2 ms until
the fault condition is removed. The data acquired from the plateau cycle are stored
and can be read from the microprocessor. If the fault condition persists, a new
plateau cycle can be programmed from I2C simply by reading. This ensures
continuous diagnostic throughout the car-radio operating time.
For a more immediate understanding, the permanent diagnostic's flowchart is as in
Figure 36.
Figure 36. Permanent diagnostic flow-chart
When a plateau cycle is done during the permanent diagnostic the bit DB1/2/3/4-D4 is set to
"1". If all the bits related to the diagnostic are "0", then the fault has possibly been removed
or not detected. Eventually, an over current event could have been occurred on a
GAPGPS00810
PLAY
MODE
OVERLOAD
NO
YES
TURN-OFF
BIG
POWERS
RESTART
CYCLE
FAULT
DETECTED
NO
YES
FIRST CYCLE
AND IB4 D0 = ‘1’
PLATEAU
CYCLE
YES
NO
RESTART
CYCLE



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