Patents Assigned to Fairchild Semiconductor Corporation
  • Publication number: 20180143674
    Abstract: A paddle board includes an electronic marker circuit configured to indicate at least one capability of a cable assembly to a device coupled to the cable assembly and to select the device as one of a source or a sink, the paddle board being powered by the device, a register configured to store at least one variable value associated with at least one of the cable assembly and the paddle board, and a temperature sensor configured to sense a temperature of the paddle board and configured to store a value indicating the sensed temperature in the register.
    Type: Application
    Filed: November 14, 2017
    Publication date: May 24, 2018
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Robert A. CARD, Erik MAIER
  • Patent number: 9978668
    Abstract: In a general aspect, a packaged semiconductor device can include a semiconductor device and a metal leadframe structure having a signal lead that is electrically coupled with the semiconductor device. The device can also include a molding compound encapsulating at least a portion of the metal leadframe structure. At least a portion of the signal lead can be exposed outside the molding compound. The device can further include a solder plating disposed on exposed portions of the metal leadframe structure. In the device, a flank of the signal lead can have a surface area. At first portion of the surface area of the flank can be defined by the solder plating, and a second portion of the surface area of the flank can be defined by exposed metal of the metal leadframe structure. A perimeter of a surface of the exposed metal can have at least one curved edge.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: May 22, 2018
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Aira Lourdes Villamor, Erwin Victor Cruz, Geraldine Suico, Silnore Sabando
  • Publication number: 20180097378
    Abstract: A power converter includes a load detector a processor and a power control block. The load detector is configured to determine a change in a load value of an electronic device coupled to the power converter without receiving a message communicated from the electronic device indicating the change in the load value, and determine if the change in the load value exceeds a threshold value. The processor, in response to determining the change in the load value exceeds the threshold value, is configured to signal the power converter to reduce a voltage. The power control block is configured to reduce the voltage based on the signal.
    Type: Application
    Filed: September 20, 2017
    Publication date: April 5, 2018
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Robert A. CARD, James A. MEACHAM, II
  • Patent number: 9936317
    Abstract: Methods and apparatus for calibrating an audio system including headset coupled to an electronic device via an audio dongle. In an example, a circuit configured to couple a Universal Serial Bus (USB) audio dongle with an audio circuit of an electronic device can include a first impedance configured to couple with a first audio channel of the audio circuit, a second impedance coupled in series with the first impedance and configured to couple with a second audio channel of the audio circuit, a third impedance coupled to a ground sense channel and to a node common to the first impedance and the second impedance, and a controller configured to initiate a first signal on the first channel, to monitor crosstalk of the first signal on the second audio channel and to adjust a setting of the third impedance to reduce the crosstalk.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: April 3, 2018
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Gregory A. Maher, Tyler Daigle
  • Publication number: 20180091042
    Abstract: A capacitor input circuit for a mobile power supply includes a bulk capacitor and a switch. The switch connects the bulk capacitor to receive a rectified AC voltage from a rectifier when an AC line voltage input to the mobile power supply is lower than a threshold voltage. When the AC line voltage is greater than the threshold voltage, the switch electrically floats the bulk capacitor.
    Type: Application
    Filed: July 31, 2017
    Publication date: March 29, 2018
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventor: Richard NICHOLSON
  • Publication number: 20180083611
    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: Application
    Filed: September 15, 2017
    Publication date: March 22, 2018
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Adrian MIKOLAJCZAK, Chang Su MITTER
  • Patent number: 9923358
    Abstract: This document discusses, among other things, a protection system and method configured to detect a parasitic impedance between first and second pins of a standard connector and to remove a current path between a power source and a supply pin of the standard connector if a low-impedance is detected, in certain examples, without adding a current sense resistance to a return path between a ground pin of the standard connector and the power source.
    Type: Grant
    Filed: February 11, 2015
    Date of Patent: March 20, 2018
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Zhibo Tao, David Kunst, Won-Seok Kang, Ke Hong
  • Patent number: 9920736
    Abstract: In a general aspect, a circuit for controlling operation of an ignition circuit including an insulated-gate bipolar transistor (IGBT) device can include a current slope detection circuit configured to detect a slope of a current in a primary winding of an ignition coil included in the ignition circuit and a driver circuit coupled with the current slope detection circuit. The current slope detection circuit can be further configured to, during charging of the ignition coil, if the detected slope is above a first limit, provide a first indication to the driver circuit; and, if the detected slope is below a second limit, provide a second indication to the driver circuit. The driver circuit can be configured to, in response to receiving the first indication or the second indication, modify operation of the ignition circuit.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: March 20, 2018
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Qingquan Tang, James E. Gillberg
  • Publication number: 20180066626
    Abstract: In a general aspect, an ignition circuit can include a control circuit configured to receive a command signal from an engine control unit, and a driving circuit coupled with the control circuit. The driving circuit can be configured to be coupled with a resonant circuit that includes a primary winding of an ignition coil. The control circuit and the driving circuit can be configured, in response to a command signal, to drive the resonant circuit at a first frequency to generate a voltage in the ignition coil to initiate a spark in a spark plug; and, in response to the spark being initiated in the spark plug, drive the resonant circuit at a second frequency to maintain the spark in the spark plug for combustion of a fuel mixture. The control circuit can be configured to, after the combustion of the fuel mixture, to disable the driving circuit.
    Type: Application
    Filed: August 10, 2017
    Publication date: March 8, 2018
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventor: Qingquan TANG
  • Publication number: 20180068935
    Abstract: In a general aspect, an apparatus can include a leadframe including a plurality of leads configured to be coupled with a printed circuit board. The plurality of leads can be disposed along a single edge of the apparatus. The apparatus can also include an assembly including a substrate and a plurality of semiconductor die disposed on the substrate. The assembly can being mounted on the leadframe. The apparatus can further include an inductor having a first terminal and a second terminal. The first terminal of the inductor can being coupled with the leadframe via a first contact pad, and the second terminal of the inductor can be coupled with the leadframe via a second contact pad. The leadframe, the assembly and the inductor can be arranged in a stacked configuration.
    Type: Application
    Filed: August 31, 2017
    Publication date: March 8, 2018
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Jerome TEYSSEYRE, Romel MANATAD, Chung-Lin WU, Bigildis DOSDOS, Erwin Ian ALMAGRO, Maria Cristina Estacio
  • Publication number: 20180069480
    Abstract: An active clamp flyback controller includes first and second input terminals, a clamp voltage detection circuit, and an overvoltage protection circuit. The first input terminal is adapted to be coupled to a terminal of a clamp capacitor. The second input terminal receives a feedback signal proportional to a voltage across an auxiliary winding of a flyback transformer. The clamp voltage detection circuit is coupled to the first and second input terminals, and detects a clamp voltage as a difference between a voltage at the first input terminal and an input voltage, the clamp voltage detection circuit calculating the input voltage using a signal from the second input terminal. The overvoltage protection circuit is coupled to the clamp voltage detection circuit for comparing the clamp voltage to a threshold and triggering a protection operation if the clamp voltage is greater than the threshold.
    Type: Application
    Filed: August 14, 2017
    Publication date: March 8, 2018
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Gwanbon KOO, Dibyendu RANA
  • Publication number: 20180058414
    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: Application
    Filed: August 10, 2017
    Publication date: March 1, 2018
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventor: Qingquan TANG
  • Publication number: 20180060201
    Abstract: A port controller includes an advertise block configured to determine a cable assembly coupled to the port controller is not compliant with a standard used by the port controller, a comparator configured to determine a current drawn from a power converter coupled to the cable assembly exceeds a capability of the power converter based on comparing a bus voltage to a threshold voltage, and a protection block configured to, in response to determining the current drawn from the power converter exceeds the capability of the power converter, cause the current drawn from the power converter to be reduced.
    Type: Application
    Filed: August 16, 2017
    Publication date: March 1, 2018
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventor: William Robert NEWBERRY
  • Publication number: 20180062653
    Abstract: In a general aspect, a circuit can include a comparison stage including a plurality of transistors and a current mirror stage including a current mirror. The comparison stage can be configured to produce a cancelling signal before a main signal is produced by the current mirror stage.
    Type: Application
    Filed: July 18, 2017
    Publication date: March 1, 2018
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventor: Kyoung Min LEE
  • Publication number: 20180062326
    Abstract: A device includes an interface configured to couple a power source to the device. The interface includes a plurality of contacts including at least one first contact configured to couple a voltage bus of the power source to a voltage bus of the device, and at least one second contact configured to couple the voltage bus of the power source to a secondary bus of the device. The device further includes a detector configured to determine a contact resistance of the at least one first contact based on a first current associated with the voltage bus and a second current associated with the secondary bus.
    Type: Application
    Filed: August 16, 2017
    Publication date: March 1, 2018
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventor: Robert A. CARD
  • Publication number: 20180054113
    Abstract: A Power Factor Correction (PFC) circuit comprises 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 comprises 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: Application
    Filed: August 9, 2017
    Publication date: February 22, 2018
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Jintae KIM, Sangcheol MOON, Hangseok CHOI
  • Patent number: 9899370
    Abstract: This document discusses, among other things, an auxiliary self-protecting transistor circuit, system, and method configured to protect a complementary metal-oxide semiconductor (CMOS) transistor. The auxiliary self-protecting transistor circuit can include an ESD device including a gate terminal, a drain terminal, and a source terminal. The ESD device is configured to be coupled to an isolation region of a complementary metal-oxide semiconductor (CMOS) transistor, and can provide a discharge path between the isolation region of the CMOS transistor and the source terminal of the ESD device. The isolation region of the CMOS transistor can include a blocking junction, such as an n-doped isolation well (niso), a p-type well (pwell), or one or more other blocking junctions.
    Type: Grant
    Filed: August 25, 2015
    Date of Patent: February 20, 2018
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Kenneth P. Snowdon, Taeghyun Kang, Alister Young
  • Publication number: 20180048241
    Abstract: A switching converter includes a synchronous rectifier and a synchronous rectifier driver that controls conduction of the synchronous rectifier. The synchronous rectifier driver turns OFF the synchronous rectifier in response to a turn-off trigger. The synchronous rectifier driver prevents the turn-off trigger from turning OFF the synchronous rectifier during a turn-off trigger blanking time that is adaptively set based on a conduction time of the synchronous rectifier.
    Type: Application
    Filed: October 23, 2017
    Publication date: February 15, 2018
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Hangseok CHOI, Lei CHEN, Cheng-Sung CHEN
  • Patent number: 9893176
    Abstract: In a general aspect, an apparatus can include a silicon carbide (SiC) trench gate MOSFET with improved operation due, at least in part, to a reduced gate capacitance. In the SiC trench gate MOSFET, a thick gate oxide can be formed on a bottom surface of the gate trench and a built-in channel, having a vertical portion and a lateral portion, can be formed to electrically connect a vertical inversion-layer channel, such as in a channel stopper layer, to a vertical JFET channel region and a drift region.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: February 13, 2018
    Assignee: Fairchild Semiconductor Corporation
    Inventor: Andrei Konstantinov
  • Patent number: 9887633
    Abstract: This disclosure provides control techniques for a resonant converter. In one embodiment, a resonant converter controller includes predictive gate drive circuitry configured to generate a predictive gate drive signal indicative of a time duration from a rising edge of a first drive signal for controlling a conduction state of a first inverter switch of a resonant converter system to a synchronous rectifier (SR) current zero crossing instant of a first SR switch of the resonant converter system, wherein the first tracking signal is based on at least the first drive signal and a voltage drop across the first SR switch. The resonant converter controller may also include SR gate drive shrink circuitry configured to generate an SR gate drive turn on delay signal to increase delay of SR on times in response to detection of a decrease in load current demand of the resonant converter system.
    Type: Grant
    Filed: February 9, 2015
    Date of Patent: February 6, 2018
    Assignee: Fairchild Semiconductor Corporation
    Inventor: Hang-Seok Choi