Short circuit protection arrangement for an output buffer of an integrated circuit
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United States of America Patent
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Oct 19, 1999
Grant Date -
N/A
app pub date -
Mar 19, 1997
filing date -
Mar 19, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The current flowing in an output field effect transistor is sensed by a parallel circuit arrangement which derives a sensed current representing the current flowing in the output transistor. The parallel circuit arrangement comprises series-connected CMOS transistors which are connected together in order to derive a current output which is representative of the load current through the output transistor. In a short circuit protected output buffer, the sensed current is compared with a reference current and if it exceeds the reference current the amplitude of the drive signal to the output transistor is reduced.
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