公开(公告)号：US12206331B2

公开(公告)日：2025-01-21

申请号：US17875214

申请日：2022-07-27

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Rengang Chen ,  Bo Wang ,  Evan Reutzel ,  Dattatreya Baragur Suryanarayana ,  Bhaskar Ramachandran ,  Preetam Tadeparthy

IPC: H02M3/158 ,  H02M1/00

Abstract: A DC-DC converter includes a current sense circuit. The current sense circuit includes a sense current output, an inductor current measurement circuit, an inductor current emulation circuit, a first switch, and a second switch. The inductor current measurement circuit has an output. The inductor current emulation circuit has an output. The first switch is coupled between the output of the inductor current measurement circuit and the sense current output. The second switch is coupled between the output of the inductor current emulation circuit and the sense current output.

公开(公告)号：US10579082B2

公开(公告)日：2020-03-03

申请号：US16208159

申请日：2018-12-03

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Aalok Dyuti Saha ,  Bhaskar Ramachandran ,  Dattatreya Baragur Suryanarayana

IPC: G05F1/573 ,  G05F1/567 ,  G01R19/165 ,  G05D23/20 ,  H03F1/02 ,  H03F1/30

Abstract: An apparatus includes a power transistor to conduct a load current from a supply voltage node to an output node and a current sense circuit coupled to the power transistor. The current sense circuit generates a current sense current proportional to the load current. A temperature sense circuit is included to generate a temperature sense voltage proportional to the temperature of the power FET. A thermal limit circuit is coupled to the temperature sense circuit. A current limit circuit is coupled to the current sense circuit and to the thermal limit circuit. The current limit circuit generates a control signal on a current limit circuit output node. The control signal is responsive to the current sense current and to a first current from the thermal limit circuit. The current limit circuit output node is coupled to a control input of the power transistor.

公开(公告)号：US10038377B2

公开(公告)日：2018-07-31

申请号：US15232646

申请日：2016-08-09

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Bhaskar Ramachandran ,  Sujan Kundpur Manohar ,  Jae Won Choi

IPC: H02M3/158

CPC classification number: H02M3/158 ,  H02M1/36

Abstract: One example includes a power supply system. The system includes a power stage comprising at least one power switch that is periodically activated during an on-time of a duty-cycle based on a switching signal to generate an output voltage at an output. The system also includes a switching controller configured to generate the switching signal based on an amplitude of a capacitor voltage at a control node associated with a capacitor that defines the on-time of the duty-cycle as a function of the capacitor being periodically charged. The switching controller includes a pre-bias stage configured to apply a pre-bias charge to the capacitor via an offset voltage prior to a start of the on-time to pre-charge parasitic capacitance associated with the power supply system prior to the start of the on-time.

公开(公告)号：US11949320B2

公开(公告)日：2024-04-02

申请号：US17678220

申请日：2022-02-23

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Vishnuvardhan Reddy Jaladanki ,  Preetam Charan Anand Tadeparthy ,  Scott Ragona ,  Rengang Chen ,  Evan Michael Reutzel ,  Bhaskar Ramachandran

IPC: H02M3/158 ,  H02M1/00

CPC classification number: H02M1/0009 ,  H02M3/158

Abstract: A device includes a current mirror, a switch, first and second current paths, first and second buffers, a variable resistor, a temperature-sensing circuit, and a controller. The first current path is coupled between the current mirror's input and the switch. The switch switches between ground and a transistor based on a control signal. The second current path is coupled between a first current mirror output and ground. The first buffer is coupled to a second current mirror output. The second buffer is coupled to the variable resistor, which is coupled to the first buffer. The temperature-sensing circuit provides a device temperature to the controller, which is coupled to a first buffer output and determines a first adjustment to the first and second current paths and a second adjustment to the variable resistor based on the device temperature.

公开(公告)号：US10910822B2

公开(公告)日：2021-02-02

申请号：US16503113

申请日：2019-07-03

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Bhaskar Ramachandran ,  Dattatreya Baragur Suryanarayana ,  Vishal Gupta

IPC: H02H3/38 ,  H02M3/07 ,  H02J7/34 ,  G01R19/165

Abstract: A system includes a first transistor having a first control input and first and second current terminals. The first current terminal couples to an input voltage node. A second transistor has a second control input and third and fourth current terminals. The third current terminal couples to the second current terminal at a first node. The fourth current terminal couples to an output voltage node. A drive circuit is configured to charge a capacitor maintain the first transistor in an off state responsive to a negative voltage on the input voltage node, and, responsive to a negative voltage on the input voltage node, to cause the charge from the capacitor to be used to turn off the first transistor. The system provides a voltage to a load coupled to the output voltage node.

公开(公告)号：US11243235B2

公开(公告)日：2022-02-08

申请号：US16230564

申请日：2018-12-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Bhaskar Ramachandran ,  Kushal D. Murthy ,  Aalok Dyuti Saha

IPC: G01R19/165 ,  G01R19/155

Abstract: A device includes a first transistor coupled to an input voltage source and to an output voltage node and an amplifier comprising a first input, a second input, and an output. The device also includes a second transistor coupled to the input voltage source and the first input of the amplifier and a third transistor coupled to the second transistor and a ground node. The third transistor includes a control terminal coupled to the output of the amplifier. The device also includes a first voltage-controlled voltage source coupled to a control terminal of the first transistor and a control terminal of the second transistor and a second voltage-controlled voltage source coupled to the first transistor and the second input of the amplifier.

公开(公告)号：US10917058B2

公开(公告)日：2021-02-09

申请号：US16185591

申请日：2018-11-09

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Aalok Dyuti Saha ,  Bhaskar Ramachandran

IPC: H03F1/22 ,  H03F3/45

Abstract: A servo-amplifier includes a first bipolar transistor, a second bipolar transistor, a cascode transistor, and a bias transistor. The second bipolar transistor includes an emitter terminal that is connected to an emitter terminal of the first bipolar transistor to form a differential amplifier. The cascode transistor includes a source terminal that is connected to a collector terminal of the first bipolar transistor. The bias transistor is coupled to the first bipolar transistor, the second bipolar transistor and the cascode transistor. The bias transistor is configured to generate a bias voltage to drive a gate terminal of the cascode transistor based on a voltage at a base terminal of the first bipolar transistor and a voltage at a base terminal of the second bipolar transistor. As a result, neither of the bipolar transistors enters a saturation region during transient or steady state operation.