SWITCH MODE POWER CONVERTER CURRENT SENSING APPARATUS AND METHOD
First Claim
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1. An integrated circuit, comprising:
- a first transistor having a first drain, a first gate, and a first source;
a switch node coupled to the first source;
an auxiliary circuit coupled in parallel with the first transistor, the auxiliary circuit including a second transistor having a second drain, a second gate coupled to an internal node configured to receive a constant voltage, and a second source coupled to the first drain of the first transistor; and
a sense circuit including a third transistor having a third drain, a third gate coupled to the internal node configured to receive the constant voltage, and a third source.
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Abstract
Methods and apparatus are presented for sensing current flowing in a power transistor of a switch mode converter, in which a voltage is sensed across a first field effect transistor connected in a series circuit branch in parallel with the power transistor, and the sensed voltage is used to generate output signal to indicate the current flowing in the power transistor.
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Citations
20 Claims
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1. An integrated circuit, comprising:
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a first transistor having a first drain, a first gate, and a first source; a switch node coupled to the first source; an auxiliary circuit coupled in parallel with the first transistor, the auxiliary circuit including a second transistor having a second drain, a second gate coupled to an internal node configured to receive a constant voltage, and a second source coupled to the first drain of the first transistor; and a sense circuit including a third transistor having a third drain, a third gate coupled to the internal node configured to receive the constant voltage, and a third source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An integrated circuit, comprising:
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a first transistor having a first drain, a first gate, and a first source; a switch node coupled to the first source; an auxiliary circuit coupled in parallel with the first transistor, the auxiliary circuit including a second transistor having a second drain, a second gate coupled to an internal node configured to receive a constant voltage, and a second source coupled to the first drain of the first transistor; and a sense circuit coupled between the second source and the second drain of the second transistor, the sense circuit configured to generate a sense voltage representative of an auxiliary current to be conducted by the second transistor. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A USB Power Delivery (PD) device, comprising:
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an input terminal, a switch node, and an output terminal a first transistor having a first drain coupled to the input terminal, a first gate, and a first source coupled to the switch node; an auxiliary circuit coupled in parallel with the first transistor, the auxiliary circuit including a second transistor having a second drain, a second gate, and a second source coupled to the first drain; and a sense circuit including a third transistor having a third drain, a third gate coupled to the second gate, and a third source coupled to the first drain. - View Dependent Claims (17, 18, 19, 20)
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Specification