CURRENT DIRECTION DETECTION CIRCUIT AND SWITCHING REGULATOR HAVING THE SAME
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Abstract
A current direction detection circuit includes a monitoring transistor having a control terminal and an output terminal respectively connected with a control terminal and an output terminal of a ground side output transistor; an impedance element having one terminal connected with an input terminal of the monitoring transistor and the other terminal grounded; first and second constant-current sources; a diode-connected reference transistor interposed between the first constant-current source and ground potential; and a sensing transistor interposed between the second constant-current source and the impedance element and having a control terminal connected with the control terminal of the reference transistor. The current direction detection circuit is small yet capable of minimizing power loss of a switching regulator.
174 Citations
4 Claims
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1-2. -2. (canceled)
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3. A current direction detection circuit for detecting a reverse flow of current in a ground side output transistor, through which current flows from a grounded input terminal to an output terminal, comprising:
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a monitoring transistor having a control terminal and an output terminal arranged to be connected, respectively, with a control terminal and an output terminal of the ground side output transistor;
an impedance element having one terminal connected with the input terminal of the monitoring transistor and the other terminal grounded;
first and second constant-current sources;
a diode-connected reference transistor arranged between the first constant-current source and ground potential; and
a sensing transistor arranged between the second constant-current source and the impedance element, the sensing transistor having a control terminal connected with a control terminal of the reference transistor;
whereina voltage between the second constant-current source and the sensing transistor is output as a control signal to control the ground side output transistor and monitoring transistor. - View Dependent Claims (4)
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Specification