公开(公告)号：US20210050809A1

公开(公告)日：2021-02-18

申请号：US16747673

申请日：2020-01-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Krishnamurthy SHANKAR ,  Venkata Naresh KOTIKELAPUDI

IPC: H02P8/22

Abstract: A stepper driver for a motor includes an H-bridge, a sense transistor coupled to the H-bridge, a voltage-to-current (VtoI) converter, and a sine digital-to-analog converter (DAC). The VtoI converter has a VtoI converter input and a VtoI converter output. The VtoI converter output is coupled to the sense transistor. The sine DAC has a sine DAC digital input, a reference input, and a sine DAC output. The sine DAC output is coupled to the VtoI converter input. The sine DAC includes an R-2R network, an offset control circuit coupled to the R-2R network, and a gain control circuit also coupled to the R-2R network.

公开(公告)号：US20240022244A1

公开(公告)日：2024-01-18

申请号：US17866128

申请日：2022-07-15

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sachin S ,  Subramanian NARAYAN ,  Krishnamurthy SHANKAR

IPC: H03K17/687

CPC classification number: H03K17/6871 ,  H02P27/04

Abstract: A gate driver includes a gate current circuit and a driver logic circuit. The gate current circuit has a gate current circuit output and includes first and second current sources coupled to the gate current circuit output. The driver logic circuit has a capacitor and is configured to: charge and discharge the capacitor to generate a detect voltage across the capacitor; cause the first current from the first current source to flow to the gate current circuit output in response to a voltage on the gate current circuit output being below the detect voltage; and cause the second current from the second current source to flow to the gate current circuit output in response to the voltage on the gate current circuit output being above the detect voltage.

公开(公告)号：US20210247462A1

公开(公告)日：2021-08-12

申请号：US16785793

申请日：2020-02-10

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Ashish OJHA ,  Siddhartha GOPAL KRISHNA ,  Divyasree J ,  Krishnamurthy SHANKAR ,  Venkata Naresh KOTIKELAPUDI

IPC: G01R31/52 ,  H03K17/687

Abstract: A circuit includes an input terminal, a first transistor, a second transistor, a comparator, a voltage reference circuit, and a control circuit. The first transistor includes a first terminal coupled to the input terminal. The second transistor includes a first terminal coupled to the input terminal. The comparator includes a first terminal coupled to the input terminal. The voltage reference circuit is coupled to a second terminal of the comparator. The control circuit includes an input, a first output, and a second output. The input is coupled to an output of the comparator. The first output is coupled to a second terminal of the first transistor. The second output is coupled to a second terminal of the second transistor.

公开(公告)号：US20210050808A1

公开(公告)日：2021-02-18

申请号：US16933583

申请日：2020-07-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Krishnamurthy SHANKAR ,  Venkata Naresh KOTIKELAPUDI ,  Siddhartha GOPAL KRISHNA

IPC: H02P8/12 ,  H02P8/22

Abstract: A stepper motor driver includes an H-bridge including first and second outputs. The H-bridge includes a low-side transistor coupled between the first output and a ground. A reference current circuit is configured to produce a reference current. The reference current circuit has a reference output. An averager circuit includes an input and output. The input of the averager circuit is coupled to the first output of the H-bridge. A comparator includes first and second comparator inputs. The first input of the comparator is coupled to the output of the average circuit and the second input of the comparator is coupled to the reference output.