Abstract: In one embodiment, a control circuit configured for an interleaved switching power supply, can include: (i) a feedback compensation signal generation circuit configured to sample an output voltage of the interleaved switching power supply, and to generate a feedback compensation signal; (ii) a first switch control circuit configured to compare a voltage signal indicative of an inductor current in the first voltage regulation circuit against the feedback compensation signal, and to control a first main power switch in the first voltage regulation circuit; and (iii) a second switch control circuit configured to turn on a second main power switch in the second voltage regulation circuit after half of a switching cycle after the first main power switch is turned on, and to regulate an on time of the second main power switch.

Abstract: An isolated DC/DC converter (3) includes a full-bridge type switching circuit. A primary winding of a transformer (6) and a resonance reactor (5) are connected in series to each other. Another end of each of the primary winding and the resonance reactor (5) is connected to one of middle points between switching elements. First and second surge suppression diodes (D5 and D6) are provided to a node between the resonance reactor (5) and the primary winding of the transformer (6) and between a positive side and a negative side of a capacitor (4). This configuration suppresses a surge voltage applied to the transformer by releasing surge energy of the resonance reactor (5) caused by a recovery of rectifying diodes (D1 to D4) on a secondary side of the transformer (6) via the surge suppression diodes (D5 and D6).

Abstract: Systems, methods, and apparatus for use in biasing and driving high voltage semiconductor devices using only low voltage transistors are described. The apparatus and method are adapted to control multiple high voltage semiconductor devices to enable high voltage power control, such as power amplifiers, power management and conversion (e.g. DC/DC) and other applications wherein a first voltage is large compared to the maximum voltage handling of the low voltage control transistors. A parallel resistive-capacitive coupling allows transmission of edge information and DC level information of control signals from a static voltage domain to a flying voltage domain. A flying comparator operating in the flying voltage domain uses clamps to force an output difference voltage that is zero only during a switching event of the flying voltage domain. A charge pump may be used to amplify inputs to the parallel-resistive coupling for a desired differential signal amplitude to the flying comparator.

Abstract: A dual level current limit apparatus constituted of: an electronically controlled switch coupled between a load and a line voltage; and a control circuitry arranged to alternately: control said electronically controlled switch to limit the magnitude of current flowing therethrough responsive to the difference between a predetermined first function of the current magnitude and a predetermined reference voltage, and control said electronically controlled switch to limit the magnitude of current flowing therethrough responsive to the difference between said first function of the current magnitude and a predetermined second function of the load voltage.

Abstract: A voltage regulator includes a power stage configured to produce an output voltage from an input voltage at an input voltage terminal, a shunt resistor connected in series between the input voltage terminal and the power stage, a first level shifting resistor connected in series between a first terminal of the shunt resistor and a first sense pin of the controller, and a second level shifting resistor connected in series between a second terminal of the shunt resistor and a second sense pin of the controller. The input current of the regulator is sensed as a function of the voltage across the shunt resistor, as shifted down by the level shifting resistors and measured across the sense pins. The input voltage of the regulator is sensed as a function of the current flowing through either one of the level shifting resistors, as measured at one of the sense pins.

Abstract: A control circuit that controls a switching element includes a first terminal to which a voltage produced by conversion of current flowing through the switching element by a current-to-voltage conversion element is input, a second terminal to which the voltage of a point of contact of an inductor and rectification element or a voltage proportional thereto is input, a filter for smoothing the voltage input into the second terminal, and a voltage comparison circuit for comparing the voltage smoothed by the filter and the voltage input into the second terminal. The control circuit performs control such that the switching element is switched from off to on near the point where the inductor current becomes zero based on the voltage comparison circuit output and the switching element is switched from on to off in response to the voltage applied to the first terminal reaching a prescribed voltage.

Abstract: In accordance with an embodiment, a method of operating a switch-mode power supply includes receiving a measurement of a first current of the switch-mode power supply, determining a ripple of the first current based on the received measurement of the first current, determining a maximum current threshold based on a target average current and the determined ripple of the first current, determining an off time of a switch based on a target current ripple and the determined ripple of the first current, turning off the switch when the first current reaches the maximum current threshold, and turning on the switch after the determined off time has elapsed after turning off the switch.

Abstract: A direct-current power supply device is a direct-current power supply device that converts a three-phase alternating current to a direct current and supplies the direct current to a load, and includes a first capacitor and a second capacitor connected in series between output terminals to the load, a charge unit that selectively charges one or both of the first capacitor and the second capacitor, and a control unit that controls the charge unit. The control unit controls an output voltage of the direct-current power supply device by a charging period of the charge unit, and also controls a power factor and a harmonic current of the direct-current power supply device by a charge timing with respect to a reference phase of the three-phase alternating current of the charge unit as a reference.

Abstract: A switching converter, which produces an output voltage, contains a switch operable between a first state for opposing a decrease in the output voltage and a second state for opposing an increase in the output voltage. The converter also contains a circuit adapted to determine a time period during which the output voltage is decreasing, wherein during the time period the switch is in the first state. The circuit also calculates, based on the time period, a time to turn the switch from the first state to the second state to prevent the output voltage increasing above a reference value. Optionally, the time to turn the switch to the second state is based on a duty cycle of the converter.

Abstract: A control circuitry can be configured to receive an error signal indicating a difference between an output voltage of the power supply and a desired setpoint for the output voltage. According to one configuration, depending on the error signal, the control circuitry initiates switching between operating the control circuitry in a pulse width modulation mode and operating the control circuitry in a pulse frequency modulation mode to produce an output voltage. Operation of the control circuitry in the pulse frequency modulation mode during a transient condition, such as when a dynamic load instantaneously requires a different amount of current, enables the power supply to satisfy current consumption by the dynamic load. Subsequent to the transient condition, the control circuitry switches back to operation in the pulse width modulation mode.

Abstract: Described herein is a termination circuit for a receiver receiving a single-ended signal. The termination circuit includes the first stage having a low-pass transfer function having a first pole/zero pair, and a second stage coupled to the first stage, where the second stage has a high-pass transfer function having a second pole/zero pair that cancels out the first pole/zero pair.

Abstract: A switch-mode converter includes a high-side driver, a high-side transistor, a low-side driver, a low-side transistor, a capacitor, and an active diode. The high-side driver is supplied by the bootstrap voltage of the bootstrap node and a floating reference voltage of a floating reference node, and generates the high-side output signal. The high-side transistor provides an input voltage to the floating reference node according to the high-side output signal. The low-side driver generates the low-side output signal. The low-side transistor couples the floating reference node to a ground according to the low-side output signal. The capacitor is coupled between the bootstrap node and the floating reference node. The active diode provides the supply voltage to the bootstrap node. When the bootstrap voltage exceeds the supply voltage, the active diode isolates the supply voltage from the bootstrap node.

Abstract: Resonant power converters and inverters include a self-oscillating feedback loop coupled from a switch output to a control input of a switching network comprising one or more semiconductor switches. The self-oscillating feedback loop sets a switching frequency of the power converter and comprises a first intrinsic switch capacitance coupled between a switch output and a control input of the switching network and a first inductor. The first inductor is coupled in-between a first bias voltage source and the control input of the switching network and has a substantially fixed inductance. The first bias voltage source is configured to generate an adjustable bias voltage applied to the first inductor. The output voltage of the power converter is controlled in a flexible and rapid manner by controlling the adjustable bias voltage.

Abstract: One example includes a switching power supply. The switching power supply includes a power stage, a feedback loop, and a simulated feedback error generator. The power stage provides an output signal in response to a switching signal. The feedback loop monitors the output signal and provides a feedback error signal to adjust the switching signal to regulate the output signal. The simulated feedback error generator temporarily provides a simulated feedback error signal during a transition period from the low power mode to a high power mode of the switching power supply until the feedback loop has enough time to provide the feedback error signal.

Abstract: Disclosed examples include inverting buck-boost DC-DC converter circuits with a switching circuit to alternate between first and second buck mode phases for buck operation in a first mode, including connecting an inductor and a capacitor in series between an input node and a reference node to charge the inductor and the capacitor in the first buck mode phase, and connecting the inductor and the capacitor in parallel between an output node and the reference node to discharge the inductor and the capacitor to the output node.

Abstract: A control arrangement for use in controlling the electrical supply from a power supply unit including an internal capacitance. The control arrangement includes first and second magnetically linked inductors arranged in series with one another and defining a connection therebetween. Third and fourth magnetically linked inductors are each connected to the connection between the first and second inductors. A switch means provides switched connections between the third and fourth inductors and ground, and a controller is operable to control the operation of the switch means such that closing of a switch of the switch means results in the formation of an LCR circuit. The internal capacitance forms the capacitance of the LCR circuit and the third or fourth inductor form the inductance of the LCR circuit. The magnetic link between the third and fourth inductors allow an output to be generated from the other of the third and fourth inductors.

Abstract: Voltage converter and control method thereof. In some embodiments, a voltage converter can include a voltage conversion circuit configured to convert an input voltage to an output voltage based on a drive signal, and a feedback circuit configured to generate an error signal based on the output voltage and a reference voltage. The voltage converter can further include a feedforward circuit configured to generate a feedforward signal based on the input voltage. The voltage converter can further include a drive control circuit configured to generate the drive signal based on the feedforward signal and the error signal.

Abstract: Current sensing with RDSON correction is disclosed. In an embodiment, a method comprises: measuring an approximate temperature of a MOS transistor switch by a temperature sensor to yield a measured temperature; calculating a corrected temperature from the measured temperature using a stored temperature sensor gain and offset correction function; measuring a gate drive voltage for the MOS transistor; calculating a voltage correction factor using a stored voltage correction function, wherein the stored voltage correction function is a function of the corrected temperature and the gate drive voltage; measuring a RDSON voltage drop across the MOS transistor switch to yield a measured RDSON voltage drop; and calculating the current using the measured RDSON drop and the voltage correction factor.

Abstract: In one form, an apparatus comprises a buck-boost converter circuit, a ripple emulator circuit, a ripple based controller circuit, and a switch control circuit. The buck-boost converter circuit includes a plurality of switches to be coupled to an inductor, and is configured to generate a regulated output voltage responsive to an input voltage. The ripple emulator circuit is configured to emulate inductor current ripple for a buck phase and a boost phase of the buck-boost converter to provide an emulated inductor current ripple. The ripple based controller circuit is configured to generate a hysteretic control signal responsive to the emulated inductor current ripple and the output voltage. The switch control circuit is configured to generate control signals for driving the plurality of switches responsive to the hysteretic control signal and a clock signal.

Abstract: The present disclosure discloses a power converter and a switching power supply device. The power converter includes an energy storing and outputting circuit used for charging a load after storing energy, a main switch used for transmitting input power to the energy storing and outputting circuit when the main switch is conducting, an after flow switch used for supplying an after flow loop to the energy storing and outputting circuit when the main switch is shut down, a driving circuit used for changing connecting states of the main switch and the after flow switch according to a preset clock frequency, and a testing circuit and a feedback circuit, the testing circuit is used for testing a voltage on a connecting node of the main switch and the after flow switch.

Abstract: An electronic switch for switching a load, having a current path which runs between an operating voltage connection and a load connection and to which a power transistor and a current sensor sensing the load current are connected, and having a control or regulating device which controls the power transistor on the basis of the load current, wherein the control or regulating device is connected to the secondary circuit of a converter circuit having a transformer, the primary circuit of which is connected to the operating voltage connection via a controlled switch arrangement.

Abstract: A control device for a switching power converter having an inductor element, a switch coupled to the inductor element, a storage element coupled to an output on which an output voltage is provided, and a diode element coupled to the storage element. The control device generates a command signal to control the switch and determine storage of energy in the inductor element in a first interval, and transfer of energy onto the storage element through the diode element in a second interval. A voltage shifter module generates a feedback voltage shifted relative to the output voltage. An amplification module has a first input receiving the feedback voltage, a second input receiving the reference voltage, and an output that supplies, as a function of the difference between the feedback and reference voltages, a control signal. A control unit receives the control signal and generates the command signal to control the switch.

Abstract: A switching converter includes a first electronic switch and a second electronic switch and respective drive circuits for switching on and switching off alternatively the first and second electronic switches. The drive circuits have a supply line for supplying to them a supply voltage. At least one of the drive circuits has, coupled to it, a capacitor for storing the supply voltage. An electronic-switching circuit is provided for selectively disconnecting the drive circuit from the supply line when the electronic switch driven thereby is switched off. In this mode, the drive circuit is supplied by the voltage stored on the capacitor.

Abstract: In one aspect, an apparatus includes: a pulse frequency modulation (PFM) voltage converter to receive a first voltage and provide a second voltage to a load; and a pulse generator. The PFM voltage converter may include an inductor to store energy based on the first voltage and a switch controllable to switchably couple the first voltage to the inductor. The pulse generator may be configured to generate at least one pulse pair to control the switch, where this pulse pair is formed of a first pulse and a second pulse substantially identical to the first pulse, where the second pulse is separated from the first pulse by a pulse separation interval, when the second voltage is less than a first threshold voltage.

Abstract: A system for trimming a load current provided to a load terminal has a reference current circuit branch and a load current circuit branch. The reference current circuit branch has a current source, a first variable resistance element and a first decoupling resistance element connected between the current source and the first variable resistance element. The load current circuit branch has the load terminal, a second variable resistance element configured to attain a resistance value depending on a resistance value attained by the first variable resistance element, and a second decoupling resistance element connected between the load terminal and the second variable resistance element. In addition, the trimming system has voltage and current regulators. The current regulator regulates the load current based on a voltage difference between a first output terminal of the first decoupling resistance element and a second output terminal of the second decoupling resistance element.

Abstract: While a current cutoff mechanism cuts off charging and discharging currents for a second electric storage device, a DC/DC converter is controlled so as to be in a state where electric power is supplied from a low-voltage side to a high-voltage side, applies voltage conversion to an input voltage of the low-voltage side so that an output voltage of the high-voltage side becomes a predetermined voltage, and after a predetermined state where the induction voltage of the AC power generator can be supplied to the low-voltage side is reached, control of the DC/DC converter is switched from the state where electric power is supplied from the low-voltage side to the high-voltage side to a state where electric power is supplied from the high-voltage side to the low-voltage side.

Abstract: A low dropout regulator (LDO) system includes a first pseudo random binary sequence (PRBS) generator configured to output a first PRBS signal; an LDO configured to output an LDO output signal and having an error amplifier, wherein the first PRBS generator is coupled to an input of the error amplifier; a second PRBS generator configured to output a second PRBS signal; and a correlator coupled to the LDO and second PRBS generator and configured to correlate the LDO output signal with the second PRBS signal to provide an impulse response data sample of the LDO.

Abstract: A control system for controlling operational modes of a DC-DC voltage converter is provided. The DC-DC voltage converter initially has an idle operational mode. The microcontroller having first and second operational mode applications. The first operational mode application determines a first encoded value based on the first operational mode value, and further determines first and second values based on the first encoded value. The second operational mode application determines a second encoded value based on the first operational mode value, and further determines third and fourth values based on the second encoded value. The first operational mode application induces the DC-DC voltage converter to transition to the first operational mode if the second value is equal to the third value.

Abstract: A hysteretic power converter constituted of: a switched mode power supply comprising an inductor, an electronically controlled switch and an output capacitor, the switch arranged to alternately open and close a loop with the inductor and a power source; a hysteretic comparator, a first input coupled to a feedback connection and arranged to receive from the feedback connection a feedback signal providing a first representation of the voltage across the output capacitor, the electronically controlled switch opened and closed responsive to an output of the hysteretic comparator; a reference voltage source arranged to generate a reference voltage, the generated reference voltage coupled to a second input of the hysteretic comparator; and a voltage coupler, the voltage coupler arranged to couple a second representation of the voltage across the output capacitor to the second input of the hysteretic comparator, such that the second representation is added to the generated reference voltage.

Abstract: A DC-DC converter includes: a switching circuit to change a voltage value of an input voltage, and to generate an output voltage; a feedback circuit connected between an output terminal to which the output voltage is supplied and a source of a first power, and to generate a feedback voltage corresponding to the output voltage; a gate pulse generator to generate a gate pulse to be supplied to the switching circuit by utilizing the feedback voltage; a current protector to control the switching circuit by utilizing the feedback voltage and the gate pulse; and a voltage protector to control the switching circuit by utilizing the feedback voltage.

Abstract: 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. The ripple detector generates a ripple voltage that is indicative of a ripple current. The adaptive offset generator generates an adaptive offset voltage from the ripple voltage and from a voltage of a transistor. The linear regulator drives the transistor to regulate an LED current in accordance with a reference control voltage that is generated from the ripple voltage and the adaptive offset voltage.

Abstract: Operational mode changes in a system-on-a-chip (SoC) integrated circuit in a complex device such as a mobile phone cause spikes in current demand which can cause voltage droops that disrupt operation of the SoC. A hybrid parallel power supply capacitively couples a switching-mode power supply and a low-dropout voltage regulator in parallel to provide high efficiency and fast response times. The low-dropout voltage regulator may include a class-AB operational transconductance amplifier driving the coupling capacitor. The switching-mode power supply and the low-dropout voltage regulator can regulate their outputs to slightly difference voltage levels. This can allow the switching-mode power supply to supply most of the SoC's current demands.

Abstract: A switched power converter includes a switchable power stage for generating an output voltage according to a switching signal and an input voltage via a switching element. The switching signal is generated by a multi-mode controller. The multi-mode controller controls a digital control path for generating a pulse width modulation switching signal and a constant-on-time control path for generating a constant-on-time switching signal. The switching signal for controlling the switching element is generated in the digital control path when the multi-mode controller is run in a high load mode. The switching signal is generated in the constant-on-time control path when the multi-mode controller is run in a light load mode.

Abstract: An apparatus including an inductor coupled to a load circuit, a control circuit, and a driver circuit. The control circuit may be configured to select a first operating mode in response to a determination that a value of current flowing through the inductor is greater than a threshold, and to otherwise select a second operating mode. In the first operating mode, the driver circuit may be configured to source current to the load circuit through the inductor for a first duration, based on a comparison of a supply voltage level to a voltage level across the load circuit. In the second operating mode, the driver circuit may be configured to source current to the load circuit through the inductor at a number of time points. At each time point the current may be sourced for a second duration that is based on an allowable peak current flowing through the inductor.

Abstract: A current mode control regulator including a control circuit and a current generator. The control circuit regulates an output voltage based on a reference voltage using current mode control. The current generator applies an adjust current to a feedback current signal, in which the adjust current is proportional to a difference between a voltage indicative of the output voltage and the reference voltage to emulate an AC load resistance at an output of the current mode regulator. A load resistor emulator emulates an AC load resistor to increase the phase margin of current mode control regulator when operating without a battery coupled to the output, such as when the battery is physically removed or otherwise electrically disconnected. Operation is not substantially changed when the battery is connected, so that the desired phase margin is achieve with or without the battery.

Abstract: In one embodiment, a current feedback circuit can include: (i) a first current mirror circuit having an input terminal coupled to a source of a main power transistor of a switching power supply, and a control terminal configured to receive a PWM control signal, the first current mirror circuit being configured to generate a first mirror current; (ii) the first current mirror circuit and the main power transistor being on such that an output sampling current flows through the first current mirror circuit and the main power transistor when the PWM control signal is active; and (iii) a second current mirror circuit configured to generate an output feedback current that is in a predetermined direct proportion with the output sampling current, and is generated in accordance with the first mirror current.

Abstract: A method of operating a buck-boost converter including an inductor and a capacitor includes; operating the buck-boost converter in boost mode until a level of an input voltage applied at an input node of the buck-boost converter reaches a desired level of an output voltage apparent at an output node of the buck-boost converter, and after the level of an input voltage reaches the desired level of the output voltage, operating the buck-boost converter in buck mode, wherein operating the buck-boost converter in buck mode and operating the buck-boost converter in boost mode overlap at least in part temporally proximate a point at which the level of the input voltage exceeds the level of the output voltage.

Abstract: A device including a first and second monitoring unit, the first monitoring unit detecting a first voltage potential and the second monitoring unit detecting a second voltage potential, the monitoring units comparing the first voltage potential and the second voltage potential to the value of the supply voltage and activate a control unit as a function of the comparisons, the control unit determining a switching point in time of a second power transistor, and an arrangement being present which generates current when the second power transistor is being switched on, the current changing the first voltage potential, and the control unit activates a first power transistor when the first voltage potential has the same value as the supply voltage, so that the first power transistor is de-energized.

Abstract: A switch control circuit may be utilized for a sequence of switching events occurring in an order of a first event, a second event, a third event, and a fourth event: the first event to activate the first switch and deactivate the second switch wherein an inductor current increases during the first event and has a positive value at an end of the first event, the second event to deactivate the first switch and activate the second switch wherein the switch control circuit maintains the current above zero during the second event, the third event to activate the first switch and deactivate the second switch, and the fourth event to deactivate the first switch and activate the second switch wherein the current decreases to a value below zero at an end of the fourth event and when the current reaches zero, a zero crossing time point is defined.

Abstract: A current detection circuit for detecting a current in a Switch Mode Power Supply (SMPS) having a first switch and a second switch coupled in series and an output filter including an inductor and a capacitor coupled to a switch node formed by the first and second switches, has a current sensing circuit for sensing a current across the second switch and generating a current sensing signal indicating current information of the second switch, and a current emulation circuit for emulating current information of the first switch. The current emulation circuit includes an inductance sensing circuit for acquiring a real-time rate of change in inductor current and an AC emulation circuit for computing the AC portion of the current information of the first switch based on the real-time rate of change in inductor current.

Abstract: The subject matter of this document can be embodied in a method that includes a voltage regulator having an input terminal and an output terminal. The voltage regulator includes a high-side transistor between the input terminal and an intermediate terminal, and a low-side transistor between the intermediate terminal and ground. The voltage regulator includes a low-side driver circuit including a capacitor and an inverter. The output of the inverter is connected to the gate of the low-side transistor. The voltage regulator also includes a controller that drives the high-side and low-side transistors to alternately couple the intermediate terminal to the input terminal and ground. The controller is configured to drive the low-side transistor by controlling the inverter. The voltage regulator further includes a switch coupled to the low-side driver circuit. The switch is configured to block charge leakage out of the capacitor during an off state of the low-side transistor.

Abstract: Systems, methods, and apparatus for use in biasing and driving high voltage semiconductor devices using only low voltage transistors are described. The apparatus and method are adapted to control multiple high voltage semiconductor devices to enable high voltage power control, such as power amplifiers, power management and conversion and other applications wherein a first voltage is large compared to the maximum voltage handling of the low voltage control transistors. A DC/DC power conversion implementation from high input voltage to low output voltage using a novel level shifter which uses only low voltage transistors is also provided. Also presented is a level shifter in which floating nodes and high voltage capacitive coupling and control enable the high voltage control with low voltage transistors.

Abstract: Methods and apparatus to improve a transient response of a multi-phase voltage regulator are disclosed. An example apparatus includes a differential amplifier to compare a first voltage to a droop voltage, the first voltage corresponding to a sum of inductor currents in the multi-phase voltage regulator, the droop voltage corresponding to an output voltage of the multi-phase voltage regulator; and output a first control voltage based on the comparison; a differentiator to compute a derivative of the droop voltage and adjust a ramp voltage with the derivative of the droop voltage to generate a second control voltage; and a comparator to compare a reference voltage with a second voltage, the second voltage being a combination of the first control voltage and the second control voltage; and when the second voltage is greater than the reference voltage, output a voltage pulse.

Abstract: A current monitoring circuit capable of being integrated onto an integrated circuit chip with the current source to be monitored, wherein the monitored current is digitized to be transmitted within and external to the host integrated circuit chip. The current monitoring circuit was originally conceived to monitor output current of a buck switching regulator but can be used in other applications. A replica transistor is drain connected to a replicated transistor, wherein an operational transconductor controls the replica transistor to produce the same current that flows in the replicated transistor and connects a copy of the current of the replicated transistor current to an integrating type ADC.

Abstract: An electronic device includes first and second transistors coupled in series between first and second source voltage levels. An inductor is coupled between a node coupling the first and second transistors and a load. Control logic is operative to generate control pulses operative to switch the first and second transistors. The controller generates the control pulses as a continuous stream of control pulses in a continuous conduction mode, and skips generation of some control pulses in a discontinuous conduction mode in response to a pulse skipping signal. A pulse skipping circuit is operative to generate a sense voltage as a function of an inductor current in the inductor, compare the sense voltage to ground, and generate a pulse skipping signal to the control logic when the sense voltage is below ground.

Abstract: A power supply includes a half-bridge circuit. The power supply further includes an output inductor connected to a switch node that is common to a high side switch and a low side switch of the half-bridge. During a turn ON time of the low side switch, a current detection circuit of the power supply samples and holds in a capacitor a valley of an inductor current flowing through the output inductor. Also during the turn ON time of the low side switch, the current detection circuit samples and holds in another capacitor a peak of the inductor current. During a turn OFF time of the low side switch, a sense inductor current that is representative of the inductor current is generated by combining the charges stored in the capacitors.

Abstract: A field device includes a detected signal converter configured to convert a detected signal of a sensor into a predetermined voltage and then to output the voltage, an amplifier configured to amplify an output signal of the detected signal converter, and a switching power supply as an internal driving power supply of the field device.

Abstract: A current sensing circuit is described. The current sensing circuit is for sensing a high side current through a high side switch and/or for sensing a low side current through a low side switch of a half bridge comprising the high side switch and the low side switch, which are arranged in series between a high side potential and a low side potential. The high side switch and the low side switch are in respective on-phases in a mutually exclusive manner. The high side sensing circuit comprises mirroring circuitry to mirror a current from a first node of the high side sensing circuit to an output node of the high side sensing circuit. The current sensing circuit comprises a low side sensing circuit to provide a sensed low side current which is indicative of the low side current during an on-phase of the low side switch.

Abstract: Disclosed is a voltage regulator circuit configured to selectively operate the voltage regulator circuit in a first mode of operation and a second mode of operation. The voltage regulator can change operation of the voltage regulator circuit between the first mode of operation to the second mode of operation in response to a change in a sensed load condition of the voltage regulator circuit. The voltage regulator can change operation from the second mode of operation to the first mode of operation in response to the sensed load condition changing from the second load condition to the first load condition, but only when the sensed load condition has not changed in a given direction between the first load condition and the second load condition for at least a predetermined period of time T.

Abstract: A multi-power supply system and a control method thereof are disclosed. The multi-power supply system includes a first power-supply unit, a second power-supply unit, a switching unit, and a control unit. The power-supply unit comprises a reverse current prevention circuit, a converter circuit, and an input circuit. The switching unit is electrically coupled to the first power-supply unit and the second power-supply unit. When the first and second input circuits are in normal operation, the control unit controls the switching unit to be turned off to allow the first power-supply unit and the second power-supply unit to supply power to a load. When one of the first and second input circuits is in abnormal operation, the control unit controls the switching unit to be turned on. The switching unit cooperates with the first and second reverse current prevention circuits to achieve the switching of input.