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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Abstract: In a general aspect, a power semiconductor device can include a silicon carbide (SiC) substrate and a SiC epitaxial layer disposed on the SiC substrate. The device can include a well region disposed in the epitaxial layer, a source region disposed in the well region and a gate trench disposed in the epitaxial layer and adjacent to the source region. The gate trench can have a depth that is greater than a depth of the well region and less than a depth of the epitaxial layer. The device can include a hybrid gate dielectric disposed on a sidewall of the gate trench and a bottom surface of the gate trench. The hybrid gate dielectric can include a first high-k material and a second high-k dielectric material that is different than the first high-k dielectric material. The device can include a conductive gate electrode disposed on the hybrid gate dielectric.

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 encapsulating at least a portion of the semiconductor device and at least a portion of the leadframe structure in a molding compound. At least a segment of the signal lead can be exposed outside the molding compound. A surface of the molding compound can define a primary plane of the packaged semiconductor device. The method can further include forming, with a laser, a groove in the segment, applying solder plating to the segment, including the groove, and separating, at the groove, the segment into a first portion and a second portion, such that the second portion of the segment is separated from the leadframe structure.

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.

Abstract: An AC-DC converter includes a main switch that is controlled according to an input AC line voltage. The main switch is allowed to be switched when a level of the input AC line voltage is within a regulation band, and is prevented from being switched when the level of the input AC line voltage is not within the regulation band. The regulation band can be dynamically adjusted based on load condition. The AC-DC converter can be a buck, boost, or buck-boost converter.

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.

Abstract: A switch mode power supply includes an error amplifier, an oscillator, a pulse width modulation logic circuit, and an output stage. The oscillator includes a current generator that receives a clock signal and provides a current proportional to a frequency of the clock signal, a current mirror having an input coupled to the output of the current generator, and a first capacitor having a first terminal coupled to an output of the current mirror and providing a ramp signal, and a second terminal coupled to power supply voltage terminal. The pulse width modulation logic circuit compares the output of the error amplifier with the ramp signal, and generates a high- and low-side drive signals respectively to first and second outputs in response to the comparing. The output stage is responsive to the high- and low-side drive signals for alternatively coupling a switch terminal between an input voltage terminal and ground.

Abstract: In some general aspects, an apparatus may include a first semiconductor die, a second semiconductor die, and a capacitive isolation circuit being coupled to the first semiconductor die and the second semiconductor die. The capacitive isolation circuit may be disposed outside of the first semiconductor die and the second semiconductor die. The first semiconductor die, the second semiconductor die, and the capacitive circuit may be included in a molding of a semiconductor package.

Abstract: A LED drive circuit according to the present invention comprises a controller and a programmable signal. The controller generates a switching signal coupled to switch a magnetic device for generating an output current to drive a plurality of LEDs. The programmable signal is coupled to regulate a current-control signal of the controller. The switching signal is modulated in response to the current-control signal for regulating the output current, and the level of the output current is correlated to the current-control signal.

Abstract: This document discusses, among other things, systems and methods to provide an internal supply rail with over voltage protection using a host power source, an external power source, and a switch configured to receive indications of host and external power source validity. In an example, the switch can be configured to provide the internal supply rail using the host power source when the indication of host power source validity indicates a valid host power source and the external power source when the indication of host power source validity indicates an invalid host power source and the indication of external power source validity indicates a valid external power source.