Semiconductor integrated circuit device
First Claim
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1. A semiconductor integrated circuit device comprising:
- a power transistor that feeds a large current to a load;
a first transistor of which a second electrode and a control electrode are connected respectively to a second electrode and a control electrode of the power transistor;
a second transistor of which one of a first electrode or a second electrode is connected to a first electrode of the first transistor; and
an operational amplifier of which one input terminal is connected to a first electrode of the power transistor, of which another input terminal is connected to the first electrode of the first transistor, and of which an output terminal is connected to a control electrode of the second transistor, wherein the second transistor outputs, at another of the first and second electrodes thereof, a current signal proportional to a current flowing through the power transistor.
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Abstract
The drain of a power transistor M1 is connected to the non-inverting input terminal of an operational amplifier A and the drain of a transistor M2 is connected to the inverting input terminal of the operational amplifier A to make substantially equal the drain voltages of the power transistor M1 and the transistor M2, of which the gates are connected together and of which the sources are connected together. The drain current of the transistor M2 is outputted via a detection terminal 13 as a current signal proportional to the drain current of the power transistor M1.
19 Citations
7 Claims
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1. A semiconductor integrated circuit device comprising:
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a power transistor that feeds a large current to a load;
a first transistor of which a second electrode and a control electrode are connected respectively to a second electrode and a control electrode of the power transistor;
a second transistor of which one of a first electrode or a second electrode is connected to a first electrode of the first transistor; and
an operational amplifier of which one input terminal is connected to a first electrode of the power transistor, of which another input terminal is connected to the first electrode of the first transistor, and of which an output terminal is connected to a control electrode of the second transistor, wherein the second transistor outputs, at another of the first and second electrodes thereof, a current signal proportional to a current flowing through the power transistor. - View Dependent Claims (2)
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3. A semiconductor integrated circuit device comprising:
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a power transistor that feeds a large current to a load;
a first transistor of which a second electrode and a control electrode are connected respectively to a second electrode and a control electrode of the power transistor;
a second transistor of which a second electrode is connected to a first electrode of the first transistor; and
a third transistor of which a control electrode is connected to a first electrode of the power transistor and of which a second electrode is connected to a control electrode of the second transistor, wherein the second transistor outputs, at a first electrode thereof, a current signal proportional to a current flowing through the power transistor. - View Dependent Claims (4, 5, 6, 7)
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Specification