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Fairchild Korea Semiconductor Ltd patents


Recent patent applications related to Fairchild Korea Semiconductor Ltd. Fairchild Korea Semiconductor Ltd is listed as an Agent/Assignee. Note: Fairchild Korea Semiconductor Ltd may have other listings under different names/spellings. We're not affiliated with Fairchild Korea Semiconductor Ltd, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "F" | Fairchild Korea Semiconductor Ltd-related inventors


Vertically stacked multichip modules

In a general aspect, a circuit assembly apparatus can include first and second semiconductor die, and a substrate. The substrate can include an insulating layer; a first metal layer disposed on a first side of the insulating layer, a first side of the first semiconductor die disposed on and electrically coupled with the first metal layer; a second metal layer disposed on a second side of the insulating layer, the second side of the insulating layer being opposite the first side of the insulating layer, a first side of the second semiconductor die being disposed on and electrically coupled with the second metal layer; and a conductive via disposed through the insulating layer, the conductive via electrically coupling the first metal layer with the second metal layer, the first metal layer, the conductive via and the second metal layer electrically coupling the first semiconductor die with the second semiconductor die.. ... Fairchild Korea Semiconductor Ltd

Coupling structure of gate driver in power supply device

A power supply device includes a power switch that is switched according to a gate voltage. A sense resistor receives a switch current that flows through the power switch to develop a sense voltage. ... Fairchild Korea Semiconductor Ltd

Semiconductor die package and manufacturing method

In a general aspect, an apparatus can include a semiconductor die, a substrate, and a leadframe coupled to the substrate. The apparatus can include a conductive clip coupled to the semiconductor die. ... Fairchild Korea Semiconductor Ltd

Control system for phase-cut dimming

A phase-cut dimming control system according to the embodiment includes a phase angle detector configured to detect a phase angle of an input voltage generated by phase-cut dimming, a feedback signal generator configured to generate a first reference signal corresponding to the detected phase angle, and generate an initial feedback signal based on a detection signal corresponding to power supplied to a load and the first reference signal, a feedback signal modulator configured to modulate the initial feedback signal and generate a feedback signal, a power transmission controller configured to generate a control signal which controls power transmission according to the feedback signal, and a power transmission circuit configured to transmit power to the load according to the control signal.. . ... Fairchild Korea Semiconductor Ltd

System and method for controlling voltage control loop in power converter

A method for controlling a power converter includes determining whether a value of a feedback signal is in a first range, detecting a plurality of points of the feedback signal, and decreasing one or both of a proportional coefficient and an integral coefficient of a first control loop of the power converter at a first plurality of times corresponding to the detected plurality of points of the feedback signal when the value of the feedback signal is in the first range. The feedback signal indicates an output signal of the power converter. ... Fairchild Korea Semiconductor Ltd

Hybrid dimming for lighting circuits

A lighting circuit includes a light emitting diode (led), a transistor that controls a current through the led, and a controller integrated circuit (ic) that controls the transistor to vary a brightness of the led. The controller ic has a dimming pin that receives a hybrid dimming signal from a dimming input circuit. ... Fairchild Korea Semiconductor Ltd

Lighting circuit with internal reference thresholds for hybrid dimming

A lighting circuit includes a light emitting diode (led), a transistor that controls a current through the led, and a lighting controller integrated circuit (ic) that controls the transistor to vary a brightness of the led. The controller ic has a dimming pin that receives a dimming signal. ... Fairchild Korea Semiconductor Ltd

Burst mode control in resonant converters

According to an implementation, a resonant converter for burst mode control includes an oscillator configured to control switching operations of at least one power switch, and a burst mode controller configured to control a burst mode by determining a start of a burst pulse of the burst mode using a first internal signal and determining an end of the burst pulse of the burst mode using a second internal signal. The burst mode controller is configured to stop the switching operations during the burst pulse.. ... Fairchild Korea Semiconductor Ltd

Resonant capacitor stabilizer in resonant converters

According to an implementation, a resonant converter for resonant capacitance stabilization during start-up includes an oscillator configured to generate a first clock signal to drive a first driver for a first power switch, and a second clock signal to drive a second driver for a second power switch during switching operations, and a resonant capacitor stabilizer configured to control the second driver to periodically activate the second power switch to discharge a resonant capacitor of a resonant network during initialization of the switching operations of the resonant converter.. . ... Fairchild Korea Semiconductor Ltd

Short-circuit protection using pulse width modulation (pwm) for resonant converters

According to an implementation, a resonant converter for short-circuit protection includes an oscillator, a short-circuit detector configured to detect a short-circuit condition in a component of the resonant converter, and a pulse width modulation (pwm) controller configured to control the oscillator in a pwm mode before short-circuit protection is triggered. The oscillator, when in the pwm mode, is configured to generate a first clock signal for driving a first power switch and a second clock signal for driving a second power switch.. ... Fairchild Korea Semiconductor Ltd

Non zero-voltage switching (zvs) detection in resonant converters

According to an implementation, a resonant converter for detecting non-zero voltage switching includes an oscillator configured to generate a first clock signal to drive a first power switch, and a second clock signal to drive a second power switch. The resonant converter includes a non-zero voltage switching (non-zvs) detection circuit configured to receive an integrated current sense signal sensed on a primary side of a transformer of a resonant network, and determine a polarity of a voltage of the integrated current sense signal at a predetermined point in the first clock signal or the second clock signal during a switching cycle. ... Fairchild Korea Semiconductor Ltd

Charge pump and switch control circuit

A charge pump includes: a first diode that is connected to a first node; a second diode that is connected to a second node; a pump capacitor that is connected to a third node to which the first diode and the second diode are connected; a power supply capacitor that is connected to the pump capacitor; a third diode that is connected between the pump capacitor and the power supply capacitor; and a zener diode that is connected in parallel to the third diode and the power supply capacitor. A power supply device decreases a ripple of an output current using a ripple reduction signal.. ... Fairchild Korea Semiconductor Ltd

Resonant converter and driving method thereof

A resonant converter includes a first switch on the primary side and a second switch coupled to the first switch, a synchronization rectification switch on a secondary side configured to conduct during a conduction period in response to a switching operation of the first switch, and a switch control circuit configured to determine an operating region of the resonant converter to be below resonance based on a result of a comparison between the conduction period and an on period of the first switch.. . ... Fairchild Korea Semiconductor Ltd

Variable blanking frequency for resonant converters

A power supply includes a transistor that is connected to a primary winding of a transformer. A controller controls a switching operation of the transistor by quasi-resonant switching. ... Fairchild Korea Semiconductor Ltd

01/11/18 / #20180014369

Led driver circuit and led driving method

A light emitting diode (led) driver circuit includes an led string and a conducting state detection circuit. The conducting state detection circuit detects a conducting state of the led string, and generates a discharge control signal upon sensing that the led string is in a non-conducting state. ... Fairchild Korea Semiconductor Ltd

12/28/17 / #20170373673

Pulse generator and driving circuit comprising the same

A pulse generator includes a first inverter configured to inverse an input pulse and output a result, a second inverter configured to inverse the output of the first inverter and output a result, a clamp inverter configured to generate a clamping voltage by clamping the output of the second inverter and generate an output pulse through a source follower which operates according to the clamping voltage, and a temperature compensator configured to compensate for variations in the clamping voltage caused by temperature change.. . ... Fairchild Korea Semiconductor Ltd

12/07/17 / #20170354004

Light emitting diode control circuit with hysteretic control and low-side output current sensing

An led control circuit controls a switching operation of a switch by hysteretic control. The led control circuit includes a controller integrated circuit (ic) that senses a current sense voltage from a current sense resistor that is on a low-side of the switch. ... Fairchild Korea Semiconductor Ltd

12/07/17 / #20170354003

Light emitting diode control circuit with wide range input voltage

A light emitting diode (led) control circuit includes an inductor current sense circuit with a high-side diode string, a low-side diode string, and a sense resistor in series with and between the high-side and low side diode strings. The led control circuit receives an input voltage on an end that connects to the high-side diode string. ... Fairchild Korea Semiconductor Ltd

11/09/17 / #20170324404

Signal calculator

Examples of a signal calculator include a voltage multiplier and a time divider. The voltage multiplier copies time information corresponding to a first voltage and generates a third voltage using a second current corresponding to a second voltage during a first period corresponding to the copied time information. ... Fairchild Korea Semiconductor Ltd

10/26/17 / #20170310231

Resonant converter and driving method thereof

A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.. . ... Fairchild Korea Semiconductor Ltd

09/14/17 / #20170264206

Active clamp flyback converter

An active clamp flyback converter includes a low-side switch that serves as a power switch and a high-side switch that serves as a clamp switch. The high-side switch is operated in one of two active clamp switching modes, which is selected based on load condition. ... Fairchild Korea Semiconductor Ltd

08/24/17 / #20170243951

Power device and method of manufacturing the same

Provided are a power device having an improved field stop layer and a method of manufacturing the same. The method can include performing a first ion implant process by implanting impurity ions of a first conductive type into a front surface of a semiconductor substrate to form an implanted field stop layer where the semiconductor substrate is the first conductive type. ... Fairchild Korea Semiconductor Ltd

07/27/17 / #20170215238

Led lighting circuit with ripple reducer

A light emitting diode (led) lighting circuit includes a ripple reducer. The ripple reducer includes a ripple detector, an adaptive offset generator, and a linear regulator. ... Fairchild Korea Semiconductor Ltd

07/20/17 / #20170207008

Circuit board with thermal paths for thermistor

A circuit board for an electronic device includes pattern areas on both sides of the circuit board. Each end of a thermistor is electrically connected to electrically conductive pads on pattern areas on the top and bottom sides of the circuit board. ... Fairchild Korea Semiconductor Ltd

07/13/17 / #20170200552

Planar transformer with multilayer circuit board

A planar transformer includes a magnetic core and a multilayer printed circuit board. A primary winding of the planar transformer is formed by winding traces on several layers of the printed circuit board. ... Fairchild Korea Semiconductor Ltd

07/06/17 / #20170194853

Power factor correction circuit and driving method thereof

Provided is a power factor correction circuit including an inductor having one end to which an input voltage is applied; a power switch connected between another end of the inductor and the ground, and configured to control an output of the power factor correction circuit; and a power factor correction controller configured to calculate a duty of the power switch on the basis of an output detection voltage corresponding to the output and an inductor current flowing through the inductor, calculate conduction-period information regarding a conduction period in which the inductor current flows in one switching cycle of the power switch, and compensate the calculated duty on the basis of the conduction-period information.. . ... Fairchild Korea Semiconductor Ltd

06/22/17 / #20170181237

Reference voltage generator and light emitting diode device comprising the same

A reference voltage generator disclosed herein includes an amplifier including two input terminals connected to a dimming signal and a first node, respectively, and an output terminal, a first transistor including a gate connected to the output terminal of the amplifier and one electrode connected to the first node, second and third transistors configured to form a current mirror, and two resistors connected between one electrode of the second transistor and one electrode of the first transistor.. . ... Fairchild Korea Semiconductor Ltd

06/22/17 / #20170181236

Led driving circuit, led device comprising the same, and driving method of led

A light emitting diode (led) driving circuit disclosed herein controls a switching operation of a power switch connected to an led string and includes a reference voltage generator configured to generate a frequency modulation reference voltage according to a dimming signal that controls brightness of the led string, and a switching controller configured to control a switching frequency of the power switch to be constant when a level of the dimming signal is higher than that of the frequency modulation reference voltage, and control the switching frequency of the power switch based on the dimming signal when a level of the dimming signal is lower than that of the frequency modulation reference voltage.. . ... Fairchild Korea Semiconductor Ltd

06/22/17 / #20170179809

Switch control circuit including multipin to set dead time information and/or protection mode

A switch control circuit includes a first pin connected to a first voltage, and a second pin connected to another end of a first resistor including an end connected to the first pin and a first capacitor. In the switch control circuit, at least two of first dead time information, second dead time information, and a protection mode are set by using a multi-voltage of the second pin. ... Fairchild Korea Semiconductor Ltd

02/23/17 / #20170054009

Superjunction semiconductor device and method of manufacturing the same

A superjunction semiconductor device includes a first semiconductor layer doped with a first conductivity type; an active region formed on the first semiconductor layer, the active region including a drift layer; and a termination region disposed to surround the active region, the termination region including a lower edge region disposed on a side surface of the drift layer and an upper edge region disposed on the lower edge region, wherein the upper edge region includes a lower charge balance region disposed on the lower edge region, the lower charge balance region having a second conductivity type different from the first conductivity type, and an upper charge balance region disposed on the lower charge balance region, the upper charge balance region having the first conductivity type.. . ... Fairchild Korea Semiconductor Ltd








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