Circuit for controlling the maximum current in a MOS power transistor used for driving a load connected to earth
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United States of America Patent
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Apr 4, 1995
Grant Date -
N/A
app pub date -
Jun 9, 1993
filing date -
Jun 16, 1992
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An improved circuit for controlling the maximum current in a MOS power transistor, in which resistor is in series with the drain-source path of the MOS power transistor. The supply terminal of a transconductance operational amplifier is connected to the output of a voltage-raising or charge pump circuit which can output a voltage higher than that of the voltage supply to which the drain of the MOS transistor is connected. The inputs of the amplifier are connected to the resistor and its output is connected to the gate of the MOS transistor so that, in operation, the maximum current flowing through the power transistor is limited to a value proportional to a reference voltage.
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