Patents Assigned to Fairchild Semiconductor Corporation
  • Patent number: 10790689
    Abstract: In a general aspect, a charging apparatus can include a power converter circuit configured to supply, from an input voltage, charging power for charging a battery of an electronic device; and a control circuit configured to determine a charging current limit and a charging voltage of the power converter circuit for charging the battery. Determining the charging current limit and the charging voltage can include: setting the current limit of the power converter circuit to an initial charging current limit and setting the charging voltage to an initial charging voltage; determining whether the power converter circuit is operating in a current limit mode or a voltage limit mode; and iteratively modifying the current limit of the power converter circuit until the power converter circuit dithers between the current limit mode and the voltage limit mode.
    Type: Grant
    Filed: November 7, 2017
    Date of Patent: September 29, 2020
    Assignee: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Mukund Krishna, Karttikeya Shah, Alvin Fok
  • Patent number: 10790810
    Abstract: In at least one general aspect, an apparatus can include a first field effect transistor (FET) device and a second FET device. The apparatus can include a characterization circuit coupled to the first FET device and the second FET device where the characterization circuit can be configured to characterize a responsiveness of each of the first FET device and the second FET device. The apparatus can include a balancer configured to produce a modified gate drive signal for the first FET device based on the responsiveness of the first FET device.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: September 29, 2020
    Assignee: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Adrian Mikolajczak, Chang Su Mitter
  • Patent number: 10749027
    Abstract: In one general aspect, an apparatus can include a semiconductor region, and a trench defined within the semiconductor region. The trench can have a depth aligned along a vertical axis and have a length aligned along a longitudinal axis orthogonal to the vertical axis. The trench can have a first portion of the length included in a termination region of the semiconductor region and can have a second portion of the length included in an active region of the semiconductor region.
    Type: Grant
    Filed: December 28, 2018
    Date of Patent: August 18, 2020
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Joseph A. Yedinak, Richard Stokes, Jason Higgs, Fred Session
  • Publication number: 20200244079
    Abstract: This document discusses, among other things, apparatus, systems, and methods to prevent a voltage of a charging battery from exceeding a voltage threshold, including receiving charging information from a battery and controlling an output current of a travel adapter, including adjusting the received battery current information using a load current to prevent the voltage of the battery from exceeding a voltage threshold, and providing output current limit information to the travel adapter using the adjusted battery current information.
    Type: Application
    Filed: April 16, 2020
    Publication date: July 30, 2020
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: James A. MEACHAM, II, Robert A. CARD
  • Patent number: 10720770
    Abstract: The disclosure provides a power supply circuit including an external power source, an ID pin provided in a universal serial bus (USB) port on a printed circuit board (PCB), and an internal power and signal management subsystem. The external power source is configured to power the internal power and signal management subsystem via the ID pin. A power supply method and a portable device are also disclosed.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: July 21, 2020
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Roger Luo, Percy Shi, Kevin Yang
  • Publication number: 20200219866
    Abstract: In one general aspect, a device can include a leadframe including at least one of an external input terminal or an external output terminal, an interposer made of an insulating material, and a redistribution layer coupled to the interposer and made of a conductive material. The redistribution layer can include a plurality of traces. The device can also include a semiconductor die disposed between the redistribution layer and the leadframe.
    Type: Application
    Filed: January 8, 2020
    Publication date: July 9, 2020
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Elsie Agdon CABAHUG, Marie Clemens Ypil QUINONES, Maria Cristina ESTACIO, Romel Nogas MANATAD, Chung-Lin WU, Jerome TEYSSEYRE
  • Patent number: 10664562
    Abstract: A method includes calculating a first estimated state of charge (SOC) of a battery at a first time, receiving a voltage value representing a measured voltage across the battery at a second time, calculating a filter gain at the second time, and calculating a second estimated SOC of the battery at the second time based on the first estimated SOC, the voltage value, and the filter gain. Another method includes storing, in a memory, a library of equivalent circuit models representing a battery, determining an operational mode of a battery based on a load associated with the battery, selecting one of the equivalent circuit models based on the determined operational mode, and calculating a state of charge of charge (SOC) of the battery using the selected equivalent circuit model.
    Type: Grant
    Filed: February 20, 2014
    Date of Patent: May 26, 2020
    Assignee: Fairchild Semiconductor Corporation and University of Connecticut
    Inventors: Balakumar Balasingam, Brian French, Yaakov Bar-Shalom, Bharath Pattipati, Krishna Pattipati, James Meacham, Travis Williams, Gopi Vinod Avvari, Tai-Sik Hwang
  • Patent number: 10666070
    Abstract: This document discusses, among other things, apparatus, systems, and methods to prevent a voltage of a charging battery from exceeding a voltage threshold, including receiving charging information from a battery and controlling an output current of a travel adapter, including adjusting the received battery current information using a load current to prevent the voltage of the battery from exceeding a voltage threshold, and providing output current limit information to the travel adapter using the adjusted battery current information.
    Type: Grant
    Filed: December 30, 2016
    Date of Patent: May 26, 2020
    Assignee: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: James A. Meacham, II, Robert A. Card
  • Patent number: 10634109
    Abstract: In a general aspect, an ignition circuit can include a control circuit that is coupled with an engine control unit (ECU) to receive a command signal from the ECU. The control circuit can include a multi-pulse generator configured to, in response to the command signal, generate a multi-pulse drive signal. The multi-pulse drive signal can include a first pulse cycle having a first duty cycle, a second pulse cycle having a second duty cycle, and a dwell period during which the multi-pulse drive signal continuously remains at a logic high value. The control circuit can be configured to provide the multi-pulse drive signal to an ignition switch coupled with the control circuit to receive the multi-pulse drive signal.
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: April 28, 2020
    Assignee: Fairchild Semiconductor Corporation
    Inventor: Qingquan Tang
  • Publication number: 20200127573
    Abstract: In one embodiment, a power supply controller, or alternately a semiconductor device having a power supply controller, may have a first circuit configured to form a sense signal that is representative of a signal from an auxiliary winding of a transformer. A feedback circuit may be configured to allow the sense signal to increase in response to a turn-off of the power switch, to subsequently detect a second increase of the sense signal prior to subsequently turning on the power switch, and to form a feedback signal as a value of the sense signal responsively to the second increase of the sense signal.
    Type: Application
    Filed: December 17, 2019
    Publication date: April 23, 2020
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Zhibo TAO, Chih-Hsien HSIEH, Yue-Hong TANG
  • Patent number: 10630170
    Abstract: A Power Factor Correction (PFC) circuit includes an oscillator circuit. The oscillator circuit receives a valley detect signal indicating a zero current condition, determines a blanking time according to an operational cycle of the PFC circuit, and determines to initiate the operational cycle according to the valley detect signal and the blanking time. Determining the blanking time includes selecting one of a plurality of predetermined blanking times according to a count of operational cycles of the PFC circuit. The PFC circuit may operate in a Boundary Conduction Mode or a Discontinuous Conduction Mode depending on whether a charge-discharge period is greater than the blanking time. The PFC circuit may determine, according to its output voltage, a first duration of a charging period, determine a delay time according to zero current times of previous operational cycles, and extend the first duration of the charging period by the delay time.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: April 21, 2020
    Assignee: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Jintae Kim, Sangcheol Moon, Hangseok Choi
  • Publication number: 20200107414
    Abstract: An LED (Light Emitting Diode) drive circuit includes a magnetic device, a power transistor, a current-sense resistor, and a controller. The magnetic device has a first terminal for receiving an input voltage derived from an input of the LED drive circuit, and a second terminal. The magnetic device generates an output current to drive at least one LED. The power transistor has a drain coupled to the second terminal of the magnetic device, a control terminal, and a source. The current-sense resistor has a first terminal coupled to the source of the power transistor for forming a current input signal, and a second terminal coupled to ground. The controller generates a switching signal coupled to control the power transistor to switch current through the magnetic device based on both a programmable signal derived from the input of the LED drive circuit, and the current input signal.
    Type: Application
    Filed: December 3, 2019
    Publication date: April 2, 2020
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Ta-Yung YANG, Chuh-Ching LI, Ming-Chieh LEE, Kuo-Hsien HUANG
  • Publication number: 20200083148
    Abstract: In a general aspect, a method for producing a packaged semiconductor device can include coupling a semiconductor device to a leadframe structure having a signal lead that is electrically coupled with the semiconductor device. The method can also include forming, with a laser, a groove in the signal lead, the groove having a first sidewall and a second sidewall, and applying solder plating to the signal lead, including the first sidewall and the second sidewall of the groove.
    Type: Application
    Filed: November 12, 2019
    Publication date: March 12, 2020
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Aira Lourdes VILLAMOR, Erwin Victor CRUZ, Geraldine SUICO, Silnore SABANDO
  • Patent number: 10560027
    Abstract: In one embodiment, a power supply controller, or alternately a semiconductor device having a power supply controller, may have a first circuit configured to form a sense signal that is representative of a signal from an auxiliary winding of a transformer. A feedback circuit may be configured to allow the sense signal to increase in response to a turn-off of the power switch, to subsequently detect a second increase of the sense signal prior to subsequently turning on the power switch, and to form a feedback signal as a value of the sense signal responsively to the second increase of the sense signal.
    Type: Grant
    Filed: February 4, 2019
    Date of Patent: February 11, 2020
    Assignee: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Zhibo Tao, Chih-Hsien Hsieh, Yue-Hong Tang
  • Patent number: 10546847
    Abstract: In one general aspect, a device can include a leadframe including at least one of an external input terminal or an external output terminal, an interposer made of an insulating material, and a redistribution layer coupled to the interposer and made of a conductive material. The redistribution layer can include a plurality of traces. The device can also include a semiconductor die disposed between the redistribution layer and the leadframe.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: January 28, 2020
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Elsie Agdon Cabahug, Marie Clemens Ypil Quinones, Maria Cristina Estacio, Romel Nogas Manatad, Chung-Lin Wu, Jerome Teysseyre
  • Publication number: 20200014298
    Abstract: A charge pump circuit generates a charge pump voltage that powers a bias circuit. The bias circuit generates a reference current and generates switch currents from the reference current. Gate-source voltages are generated from the switch currents and applied to switching components of switch circuits to connect two nodes. The gate-source voltages can be generated in the bias circuit and provided to the switch circuits. The gate-source voltages can also be generated in the switch circuits.
    Type: Application
    Filed: September 16, 2019
    Publication date: January 9, 2020
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventor: Lei HUANG
  • Patent number: 10531528
    Abstract: An LED drive circuit includes a controller, generating a switching signal to switch a magnetic device that receives an input voltage derived from an input of the LED drive circuit, for generating an output current to drive at least a LED. The controller includes an input circuit receiving a programmable signal correlated to the input of the LED drive circuit to generate a programmable current, the programmable current modulating a current input signal correlated to a switching current of the magnetic device to form a modulated current input signal, and a comparison circuit comparing a signal sourced from an oscillator and a voltage potential generated in response to the modulated current input signal for generating a current control signal. The switching signal is controlled in response to the current control signal for regulating the output current, and a level of the output current is correlated to the current control signal.
    Type: Grant
    Filed: July 25, 2019
    Date of Patent: January 7, 2020
    Assignee: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Ta-Yung Yang, Chuh-Ching Li, Ming-Chieh Lee, Kuo-Hsien Huang
  • Patent number: 10530356
    Abstract: The present invention provides an overcurrent detection circuit, an overcurrent detection method, a load circuit, and a portable device. The overcurrent detection circuit comprises: a first overcurrent detection sub-circuit and a second overcurrent detection sub-circuit; wherein: the first overcurrent detection sub-circuit is configured to perform overcurrent detection for a switch circuit when a voltage of an output terminal of the switch circuit is greater than or equal to a preset threshold; and the second overcurrent detection sub-circuit is configured to perform overcurrent detection for the switch circuit when the voltage of the output terminal of the switch circuit is less than the preset threshold.
    Type: Grant
    Filed: February 26, 2015
    Date of Patent: January 7, 2020
    Assignee: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Maoxu Li, Shide Zheng
  • Patent number: 10514430
    Abstract: In one general aspect, a system includes a material including a surface, and a magnetic sensor configured to sense a first component and a second component of a magnetic field. The first component of the magnetic field may be orthogonal to the second component of the magnetic field. The magnetic sensor may include a first sense element included on a first angled surface sloping in a first direction relative to the surface of the material, a second sense element included on a second angled surface sloping in the first direction, and a third angled surface sloping in a second direction different from the first direction where the third angled surface can be disposed between the first angled surface and the second angled surface and can exclude a sense element.
    Type: Grant
    Filed: October 9, 2017
    Date of Patent: December 24, 2019
    Assignee: Fairchild Semiconductor Corporation
    Inventor: Phil Mather
  • Patent number: 10504989
    Abstract: In at least one general aspect, a silicon carbide (SiC) device can include a drift region and a termination region at least partially surrounding the SiC device. The termination region can have a first transition zone and a second transition zone. The first transition zone can be disposed between a first zone and a second zone, and the second zone can have a top surface lower in depth than a depth of a top surface of the first zone. The first transition zone can have a recess, and the second transition zone can be disposed between the second zone and a third zone.
    Type: Grant
    Filed: July 16, 2018
    Date of Patent: December 10, 2019
    Assignee: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventor: Andrei Konstantinov