Circuit for driving a depletion-type JFET
AssigneeRichtek Technology Corporation
InventorChung-Lung Pai
Life of this patent
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Abstract
A circuit for driving a depletion-type JFET comprises a capacitor connected between the gate of the depletion-type JFET and a control signal, and a switch that is controlled by the control signal connected between the gate and source of the depletion-type JFET. The depletion-type JFET is turned on when the control signal is at a high voltage, and is turned off when the control signal is switched to a low voltage. The circuit and its driven depletion-type JFET can be integrated on a single chip to be a new power switch apparatus.
Claims38
A circuit for driving a depletion-type JFET having a drain, a source and a gate, said circuit comprising:
- a capacitor connected between said gate and a control signal;
- and
- a switch connected between said gate and source, said switch having a control input for receiving said control signal, wherein said switch comprises an N-channel enhancement-type JFET.
A circuit for driving a depletion-type JFET having a drain, a source and a gate, said circuit comprising:
- a capacitor connected between said gate and a control signal;
- and
- a switch connected between said gate and source, said switch having a control input for receiving said control signal, wherein said switch comprises a P-channel enhancement-type JFET.
A circuit for driving a depletion-type JFET having a drain, a source and a gate, said circuit comprising:
- a capacitor connected between said gate and a control signal;
- a switch connected between said gate and source, said switch having a control input for receiving said control signal, said circuit generating at an output thereof a gate driving voltage turning ON and OFF said depletion-type JFET when coupled between the gate and the source thereof;
- and
- a current limiter connected between said control input and control signal.
A power switch apparatus comprising:
- a depletion-type JFET having a drain, a source and a gate;
- and
- a switch connected between said gate and source, said switch having a control input for receiving a control signal, said switch outputting at an output thereof a gate driving voltage turning ON and OFF said depletion-type JFET when coupled between the gate and the source thereof, said switch including an N-channel enhancement-type JFET.
A power switch apparatus comprising:
- a depletion-type JFET having a drain, a source and a gate;
- and
- a switch connected between said gate and source, said switch having a control input for receiving a control signal, said switch outputting at an output thereof a gate driving voltage turning ON and OFF said depletion-type JFET when coupled between the gate and the source thereof, said switch including a P-channel enhancement-type JFET.
A power switch apparatus comprising:
- a depletion-type JFET having a drain, a source and a gate;
- a switch connected between said gate and source, said switch having a control input for receiving a control signal, said switch outputting at an output thereof a gate driving voltage turning ON and OFF said depletion-type JFET when coupled between the gate and the source thereof;
- and
- a current limiter connected between said control input and control signal.
Dependencies are inferred from the claim text.