Abstract: A control circuit and control method for controlling a step-up switching converter. The control circuit has an ultra-low voltage regulation module used to generate a control signal based on an output voltage feedback signal and an input voltage signal. When the input voltage signal is smaller than an ultra-low voltage threshold, the control signal controls a high side switch of the step-up switching converter off and controls a low side switch of the step-up switching converter to perform on and off switching. Meanwhile, a parasitic diode of the high side switch is on once the low side switch is off.

Abstract: An LED driving system for synchronizing two LED driving integrated circuits to drive LED strings. The LED driving system sequentially activates the LED strings driven by the first LED driving integrated circuit and then outputs a downstream enabling signal from the first LED driving integrated circuit to the second LED driving integrated circuit to activate the LED strings driven by the second LED driving integrated circuit.

Abstract: A trans-inductor voltage regulator (TLVR) circuit has multiple phases and a regulator block for each phase. Each regulator block has a winding of a transformer as an output inductor. The other windings of the transformers are connected in series with a nonlinear compensation inductor. The compensation inductor has a large inductance when the compensation inductor current is responsive to a steady state load current and has a small inductance when the compensation inductor current is responsive to a transient load current.

Abstract: A control circuit of a zero current controlled dimming circuit having a high side power switch, a low side power switch and an inductor, having: an error circuit, providing a compensation signal based on a reference signal and a current sense signal indicative of an output current; a compensation circuit, providing a compensation off time signal based on the compensation signal and a peak value sample and hold signal indicative of a peak value of an inductor current; and a control signal generating circuit, providing a low side switch control signal to control the low side power switch based on the compensation off time signal, wherein after the inductor current decreases to zero, the low side power switch maintains on for a compensation off time period determined by the compensation off time signal.

Abstract: A switching regulator with improved load regulation is discussed. The switching regulator increases an on time length of a first power switch if the switching regulator operates at discontinuous current mode and a current flowing through the second power switch crosses a zero reference, until the first power switch is turned on again; and the switching regulator maintains the on time length of the first power switch during other time period.

Abstract: A hybrid DC-DC converter includes a converter circuit, a bridge circuit with a bridge path that includes a winding of a transformer, and another bridge circuit with a bridge path that includes another winding of the transformer. Current through the bridge path of the other bridge circuit flows through the converter circuit in one direction and bypasses the converter circuit in the other direction. The converter circuit can operate in buck, boost, or buck-boost mode.

Abstract: A current sensing circuit for sensing a current flowing through a current sense resistor, wherein the current sense resistor is configured to receive a variable power input voltage. The current sensing circuit includes: a current sense amplifier having a first input terminal configured to be coupled to a first terminal of the current sense resistor to receive the power input voltage, a second input terminal configured to be coupled to a second terminal of the current sense resistor, and an output terminal for providing a current sensing signal indicative of the current flowing through the current sense resistor; and a calibration circuit configured to be coupled to the first input terminal of the current sense amplifier. The calibration circuit is configured to convert the power input voltage into a calibration current, and provide the calibration current to the current sense amplifier, so as to reduce a change in the current sensing signal caused by a change in the power input voltage.

Abstract: A power converter includes a first and a second transformers having different auxiliary winding voltage levels. A bias voltage supply circuit generates a bias supply voltage of an integrated circuit used to control the power converter, and includes a first and a second bias supply branches jointly coupled to a supply capacitor to provide the bias supply voltage. When the bias supply voltage is higher than a threshold voltage, the first bias supply branch to receive the one with lower level of the two auxiliary winding voltages is switched from a deactivation state to an activation state to provide the bias supply voltage, when the bias supply voltage is less than the threshold voltage, the second bias supply branch to receive the one with larger level of the two auxiliary winding voltages is switched from the deactivation state to the activation state to provide the bias supply voltage.

Abstract: An inductor has one or more wires and a multipart magnetic core. The multipart magnetic core has magnetic core parts that are adjacent and magnetically coupled. The inductor provides an inductance of at least 40 nH for currents greater than 1 A and less than 60 A, and at least 20 nH for currents of at least 60 A.

Abstract: A multiphase switching converter has a plurality of switching circuits coupled in parallel, and a plurality of control circuits configured in a daisy chain. Each control circuit receives a phase input signal, and provides a phase output signal and a switching control signal for controlling a corresponding switching circuit. One of the plurality of control circuits is master control circuit to provide the phase output signal and the switching control signal based on a turn-on control signal and the phase input signal. When a combination of the phase output signal and the switching control signal provided by the master control circuit meets a phase transfer type, the phase output signal of the master control circuit equals the turn-on control signal.

Abstract: An energy recycle circuit for a flyback circuit, the flyback circuit has a primary winding of a transformer a primary switch. The energy recycle circuit has an energy recycle branch coupled in parallel with the primary winding, and an integrated circuit having a plurality of pins. The energy recycle branch has an auxiliary switch and a clamp capacitor connected in series. Among the plurality of pins, a first pin receives an external supply voltage. A second pin is used as a power ground that is different from a primary power ground. A third pin is used to sense a branch current flowing through the energy recycle branch. A fourth pin is used to control an operation of the auxiliary switch. A fifth pin that is connected to an external resistor for setting a maximum ON-time threshold of the auxiliary switch.

Abstract: A trans-inductor voltage regulator (TLVR) circuit has multiple phases and a regulator block for each phase. Each regulator block has a winding of a transformer as an output inductor. The other windings of the transformers are connected in series with a nonlinear compensation inductor. The compensation inductor has a large inductance when the compensation inductor current is responsive to a steady state load current and has a small inductance when the compensation inductor current is responsive to a transient load current.

Abstract: A driving circuit for driving a synchronous rectifier device. The driving circuit may include a controllable charging circuit and a slope sensing circuit. The slope sensing circuit may sense whether an abrupt rising change in a voltage drop from a sensing terminal to a reference ground terminal of the driving circuit is occurring, and provide a slope sensing signal in response to a rising edge of the abrupt rising change in the voltage drop. The controllable charging circuit may receive the slope sensing signal and provide a charging current to a supply terminal of the driving circuit in response to each rising edge of the abrupt rising change in the voltage drop.

Abstract: A power supply having at least one PMIC provides flexible control to the power manage systems. The PMIC has an enable pin configured to receive a control signal, and a clock pin configured to generate and/or receive a series of clock pulses, so as to facilitate the operation of the PMIC.

Abstract: A control circuit for a resonant converter has a communication interface, a memory, and a primary switching control circuit. The memory provides a frequency setting signal capable of being programmed through a communication interface, the primary switching control circuit provides a first control signal to control a high-side switch and a second control signal to control a low-side switch. When the resonant converter works in an open loop mode, a frequency of the first control signal and the second control signal is determined by the frequency setting signal, an on-time period of the high-side switch equals an on-time period of the low-side switch, less than half of a resonant period.

Abstract: A switching power supply circuit with synchronous rectification has an energy storage component, a SR switch coupled to a secondary side of the energy storage component, and a secondary control circuit. The secondary control circuit has a turning-ON control circuit for providing a turning-ON control signal based on a comparison of a drain to source sensing voltage of the SR switch and a turn ON threshold, a mode determination circuit for providing a mode signal to determine a turn ON delay based on a detection to a transient event or the drain to source sensing voltage ringing of the SR switch, and a gate driver circuit for driving the SR switch. When the turning-ON control signal is asserted, the gate driver circuit charges a gate voltage of the SR switch after the turn ON delay based on the mode signal, to turn ON the SR switch.

Abstract: A sequence assignment method used in multiphase switching converters with daisy chain configuration, wherein the multiphase switching converter includes a plurality of switching circuits coupled in parallel, and a plurality of control circuits configured in a daisy chain and sharing a phase control signal. Each control circuit generates a phase output signal, and a switch control signal for controlling a corresponding switching circuit based on a phase input signal and the phase control signal.

Abstract: A fault protection method used in a multiphase switching converter which includes a plurality of switching circuits coupled in parallel and a plurality of control circuits configured in a daisy chain. Each control circuit has a first terminal coupled to a phase control signal, a second terminal coupled to a previous control circuit in the daisy chain to receive a phase input signal, and a third terminal coupled to a latter control circuit in the daisy chain to provide a phase output signal.

Abstract: Voltage regulators generate voltage rails that power a central processing unit (CPU). The CPU communicates power management instructions to a power supply controller that drives the voltage regulators. The power supply controller sets a voltage level of a voltage rail generated by a voltage regulator in accordance with a power management instruction received from the CPU. The power supply controller enables the voltage regulator to operate in discontinuous conduction mode (DCM) independent of power state commands from the CPU.

Abstract: A multiphase switching converter has a plurality of switching circuits coupled in parallel, and a plurality of control circuits configured in a daisy chain. Each control circuit receives a phase input signal, and provides a phase output signal and a switching control signal for controlling a corresponding switching circuit. When a current sense signal is less than a phase shedding threshold, and if a corresponding one of the control circuits is a last one in the daisy chain or if a pulse on the phase input signal lasts within a preset time period, then a corresponding one of the switching circuits stops a power output, and the phase output signal equals the phase input signal.