公开(公告)号：US20230056957A1

公开(公告)日：2023-02-23

申请号：US17409633

申请日：2021-08-23

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sandeep KALYADAN ,  Krishnamurthy Ganapathi SHANKAR ,  Venkatesh GUDURI

IPC: G01R31/28 ,  G01R31/26

Abstract: A device includes FETs with control terminals. A gate driver circuit causes the FETs to turn on and to enter a high-impedance state in response to an OCP signal. A current sense circuit senses an FET current through the FETs and sends the OCP signal to the gate driver circuit when the FET current exceeds an OCP current for longer than an OCP deglitch period. A test sequencer, in response to receiving an external test mode signal, sets the OCP current to a preset OCP test current, sets the OCP deglitch period to a preset OCP deglitch test period, and causes the gate driver circuit to turn on the plurality of FETs.

公开(公告)号：US20210405678A1

公开(公告)日：2021-12-30

申请号：US17469444

申请日：2021-09-08

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Krishnamurthy Ganapathi SHANKAR

IPC: G05F3/26 ,  H02H7/12 ,  H02M3/07 ,  H03K17/693 ,  H03K17/62 ,  H02P7/03

Abstract: A driver circuit includes three sub-circuits. A first sub-circuit is configured to generate a drive current output by the driver circuit through an output node during first and second regions of operation and includes: a diode coupled to the output node and a first transistor, and a second transistor coupled to the first transistor and a current mirror. A second sub-circuit is configured to generate the drive current during the first and second and a third region of operation and includes: a third transistor coupled to the output node; and a fourth transistor. A third sub-circuit is configured to generate the drive current during the third region of operation and includes: a current source coupled to the current mirror and a buffer; and a fifth transistor coupled to the third transistor and the fourth transistor and configured to receive an output of the buffer.

公开(公告)号：US20200036372A1

公开(公告)日：2020-01-30

申请号：US16587082

申请日：2019-09-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Krishnamurthy Ganapathi SHANKAR

IPC: H03K17/06 ,  H02M3/07 ,  H03K17/22 ,  H02P7/28

Abstract: A system includes a trickle charge control circuit coupled to a charge pump and a motor driver circuit. The trickle charge control circuit is configured to sense a voltage at a bootstrap capacitor voltage node (VBST) of the motor driver circuit; as a result of the voltage at VBST being greater than a voltage at an input voltage node (VIN), couple a charge pump voltage node (VCP) to VBST of the motor driver circuit, where a voltage at VCP is greater than the voltage at VIN; and as a result of the voltage at VBST being less than the voltage at VIN, decouple VCP from the charge pump from VBST of the motor driver circuit.