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US 8,553,388 B2Granted
Electronic device for controlling a current
AssigneeTexas Instruments Deutchsland GmbH
InventorSri Navaneethakrishnan Easwaran
Life of this patent
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Abstract
An electronic device is provided for controlling a current. The electronic device includes a first MOS transistor coupled with a gate to a common gate node, with a source to ground and with a drain to a pin so as to receive from the pin a current to be controlled. There is a second MOS transistor coupled with a gate to the common gate node, with a source to ground and with a drain so as to receive a reference current controlled by a control loop. There is a first resistor coupled between the common gate node and ground.
Claims14
An apparatus comprising:
- a squib pin;
- a ground pin;
- a squib coupled to the squib pin;
- a control loop;
- a first MOS transistor that is coupled between the squib pin and the ground pin, wherein the first transistor is controlled by the control loop;
- a resistor that is coupled to the control loop;
- a second MOS transistor that is coupled to the resistor;
- a third MOS transistor that is coupled between the second transistor and the ground pin, wherein the third MOS transistor is controlled by the control loop;
- and
- an amplifier that is coupled to the squib pin and a node between the second transistor and the third transistor and that is coupled to the gate of the second transistor, wherein the amplifier equalizes the drain-source voltages of first and third MOS transistors.
7 more elements
An apparatus comprising:
- a squib pin;
- a ground pin;
- a squib that is coupled to the squib pin;
- a capacitor coupled to the squib pin;
- a control loop;
- a first MOS transistor that is coupled between the squib pin and the ground pin, wherein the first transistor is controlled by the control loop;
- a resistor that is coupled to the control loop;
- a second MOS transistor that is coupled to the resistor;
- a third MOS transistor that is coupled between the second transistor and the ground pin, wherein the third MOS transistor is controlled by the control loop;
- and
- an amplifier that is coupled to the squib pin and a node between the second transistor and the third transistor and that is coupled to the gate of the second transistor, wherein the amplifier equalizes the drain-source voltages of first and third MOS transistors.
8 more elements
Dependencies are inferred from the claim text.