公开(公告)号：US09893607B1

公开(公告)日：2018-02-13

申请号：US15644811

申请日：2017-07-09

Applicant: NXP B.V.

Inventor： Mingliang Wan ,  Xindong Duan ,  Jian Qing

IPC: H02M1/36 ,  H02M3/07 ,  G05F1/575

CPC classification number: H02M1/36 ,  G05F1/575 ,  H02M3/07

Abstract: A low drop-out voltage regulator (LDO) includes an LDO unit, a switch circuit, a charge pump, and an initiation circuit. The switch circuit is coupled to a voltage input terminal and outputs a selected input voltage. The LDO unit receives the selected input voltage from the switch circuit and generates a regulated output voltage. The charge pump is coupled to the LDO unit to receive the regulated output voltage, and generate a control signal that is provided to the switch circuit. The initiation circuit receives the input voltage and generates an initiation voltage that greater than the regulated output voltage. The initiation voltage is provided to the charge pump circuit, along with the regulated output voltage. The initiation voltage drives the charge pump circuit when the regulated output voltage is not large enough to drive the charge pump circuit.

公开(公告)号：US20180138696A1

公开(公告)日：2018-05-17

申请号：US15678991

申请日：2017-08-16

Applicant: NXP B.V.

Inventor： Shenglan Tang ,  Jian Qing ,  Xindong Duan

IPC: H02H9/04

CPC classification number: H02H9/041

Abstract: A surge protection circuit includes a DC trigger circuit that generates a trigger signal when a surge pulse occurs, and a surge protection device, coupled to the DC trigger circuit, that generates a clamp voltage as an output voltage of the surge protection circuit and conducts surge currents to ground in response to the trigger signal. A feedback circuit is provided between the surge protection device and the DC trigger circuit. The feedback circuit lowers the clamp voltage so that it does not exceed a failure voltage of the surge protection device.

公开(公告)号：US10693292B2

公开(公告)日：2020-06-23

申请号：US15678991

申请日：2017-08-16

Applicant: NXP B.V.

Inventor： Shenglan Tang ,  Jian Qing ,  Xindong Duan

IPC: H02H9/00 ,  H02H9/04

Abstract: A surge protection circuit includes a DC trigger circuit that generates a trigger signal when a surge pulse occurs, and a surge protection device, coupled to the DC trigger circuit, that generates a clamp voltage as an output voltage of the surge protection circuit and conducts surge currents to ground in response to the trigger signal. A feedback circuit is provided between the surge protection device and the DC trigger circuit. The feedback circuit lowers the clamp voltage so that it does not exceed a failure voltage of the surge protection device.

公开(公告)号：US10168725B2

公开(公告)日：2019-01-01

申请号：US15679024

申请日：2017-08-16

Applicant: NXP B.V.

Inventor： Tinghua Yun ,  Xindong Duan ,  Mingliang Wan

IPC: G01R27/02 ,  G05F3/26 ,  G01R19/00 ,  H02M3/158

Abstract: A current clamp circuit includes a current-source circuit, a current-sense circuit, and a feedback circuit. The current-sense circuit includes a transistor, a resistive network, and a multiplexer. The transistor outputs a sensed current signal having a current that is equal to a current of an output signal provided by the current-source circuit. The feedback circuit limits the current of the sensed current signal and the output signal below a threshold current. The multiplexer modifies a resistance of the resistive network based on a first control signal. The multiplexer circuit and the feedback circuit are programmed using the first control signal and a second control signal when the transistor operates in a linear region and in a saturation region, respectively, to accurately output the sensed current signal.

公开(公告)号：US20180136685A1

公开(公告)日：2018-05-17

申请号：US15679024

申请日：2017-08-16

Applicant: NXP B.V.

Inventor： Tinghua Yun ,  Xindong Duan ,  Mingliang Wan

IPC: G05F3/26 ,  G01R19/00 ,  H02M3/158 ,  G01R27/02

CPC classification number: G05F3/262 ,  G01R19/0092 ,  G01R27/02 ,  H02M3/1588

Abstract: A current clamp circuit includes a current-source circuit, a current-sense circuit, and a feedback circuit. The current-sense circuit includes a transistor, a resistive network, and a multiplexer. The transistor outputs a sensed current signal having a current that is equal to a current of an output signal provided by the current-source circuit. The feedback circuit limits the current of the sensed current signal and the output signal below a threshold current. The multiplexer modifies a resistance of the resistive network based on a first control signal. The multiplexer circuit and the feedback circuit are programmed using the first control signal and a second control signal when the transistor operates in a linear region and in a saturation region, respectively, to accurately output the sensed current signal.