Abstract: Provided are a switching regulator and a comparator-based zero current detection method. The switching regulator comprises: a switch configured to connect to a switching node and control an inductor current flowing through the switching node; and a switch controller configured to control a turn-off time of the switch by detecting a change in a voltage of the switching node after the switch is turned off, wherein the switch controller comprises: a comparator configured to compare a first voltage applied to a first input terminal connected to the switching node with a second voltage applied to a second input terminal connected to a first terminal of the switch; and a control logic configured to receive a comparison signal of the comparator and control an offset of the comparator to adjust the turn-off time of the switch.

Abstract: A control circuit used in a switching converter having a coil, a switching transistor, and a detection resistor, includes: a current detection terminal configured to receive a detection voltage obtained by superimposing a voltage detection signal on a current detection signal; a sample hold circuit configured to sample-hold the detection voltage in an OFF period of the switching transistor to generate a sample hold voltage; a variable amplifier configured to amplify a difference between the sample hold voltage and the detection voltage; a duty controller configured to generate a pulse modulation signal; a driver configured to control the switching transistor based on the pulse modulation signal; and an overcurrent protection circuit configured to compare the detection voltage with a predetermined threshold voltage and change the pulse modulation signal to an OFF level of a switching transistor when the detection voltage is identical to the predetermined threshold voltage.

Abstract: Some embodiments include apparatuses having a switch regulator that includes a first circuit with a first comparator to compare an output of the switch regulator to a first reference voltage, and to provide a control signal to enable or disable a first pass element based on the comparison. The switch regulator includes at least a second circuit having a second comparator to compare an output of the switch regulator to a second reference voltage that is lower than the first reference voltage, and to provide a control signal to enable or disable a second pass element based on the comparison. The switch regulator does not include Miller compensation circuits. Other apparatuses and methods according to other embodiments are described.

Abstract: Cascaded buck boost DC to DC conversion systems, controllers and methods are presented, in which a buck converter stage is pulse width modulated in a first mode and a boost converter stage is pulse width modulated in a second mode, with the pulse width modulation using a first one of peak current control in valley current control in the first mode, and using the other of peak current control in valley current control in the second mode, and operation is switched between the first and second modes based on an on-time of a low side driver switch of the buck converter stage or the boost converter stage.

Abstract: A method of driving a power stage configured to provide both a positive output voltage higher than a first potential to a positive output and a negative output voltage to a negative output includes generating a first control signal and a second control signal, and initiating a charging phase, a first duty cycle of the first control signal controlling an amount of energy to be accumulated. The method further includes initiating a first discharging phase of discharging a second amount of energy the positive output and the negative output, based on a simultaneous monitoring of the first control signal and the second control signal, the amount of energy to be discharged being controlled via a second duty cycle of the second control signal.

Abstract: A DC-DC converter includes first and second switching devices electrically connected in series between an input terminal and a ground terminal, third and fourth switching devices electrically connected in series between an output terminal and the ground terminal, an inductor, a drive circuit that drives the first switching device to turn on and off, a bootstrap capacitor circuit connected electrically to the drive circuit, and a control circuit. The control circuit is operable to turn on and off the switching devices serially connected with each other after a simultaneous-off duration for which both of the switching devices are continuously turned off. The control circuit is operable to charge the bootstrap capacitor by continuously turning on keeping the second switching device for a charging duration while continuously turning off the first switching device for a sustaining duration determined by the simultaneous-off duration and the charging duration.

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 apparatuses drive a Single Inductor Bipolar Output Buck-Boost configured to provide both positive output voltage and a negative output voltage. The power stage is driven so that an amount of energy to be accumulated during a charging phase is controlled via the duty cycle of a first control signal, and an amount of energy to be discharged during an independent discharging phase in a buck-type or boost-type is controlled via the duty cycle of a second control signal.

Abstract: A DC-DC converter includes a switching device, a drive circuit for turning on and off the switching device, a bootstrap capacitor electrically connected to the drive circuit, and a control circuit electrically connected to the drive circuit. The control circuit is operable to charge the bootstrap capacitor for a charging duration periodically at a charging period longer than an on-off period at which the switching device is turned on and off periodically. This DC-DC converter performs efficient boost and step-down operations.

Abstract: Overcurrent protection devices and methods for electronic modules. In some embodiments, an overcurrent protection system can be implemented for an electronic circuit. The system can include a detection unit configured to detect an overcurrent condition associated with the electronic circuit and generate an overcurrent signal indicative of the overcurrent condition. The system can further include a consumption system in communication with the detection unit. The consumption system can be configured to consume and thereby reduce a current in a path associated with the electronic circuit upon receipt of the overcurrent signal. The consumption system can be further configured to not consume the current when the overcurrent signal ceases.

Abstract: System and method for adaptively altering a power supply's dead time. A method comprises detecting a start of a dead time, detecting an ending condition of the dead time, and ending the dead time. The detecting of the ending condition is based on a first current flowing through a lower portion of the power supply or a second current flowing through a gate driver of a lower switching element in the power supply.

Abstract: A non-isolated (transformerless) direct current-to-direct current (DC-DC) power supply includes a voltage converter module that converts DC input voltage having a first voltage level into a DC output having a second voltage level that is less than the first voltage level. An overvoltage protection module interposed between the input voltage source and the input to the DC-DC converter monitors the DC output and removes power from the voltage converter module if the DC output exceeds an overvoltage threshold. A second level of overvoltage protection that responds faster than the power disconnect module is provided within the DC-DC converter PWM controller, providing additional overvoltage protection to the DC-DC converter and preventing application of the input voltage to the converter output.

Abstract: Rectifier circuit including a pair of input terminals, a pair of output terminals, and a first circuit interconnecting the pair of input terminals. The first circuit includes an energy storing element and a rectifier bridge, wherein the rectifier bridge includes at least one controllable switching element per bridge branch. An output of the rectifier bridge supplies the pair of output terminals and wherein the at least one controllable switching element per bridge branch is configured to provide a temporary conducting path via the rectifier bridge which bypasses the pair of output terminals and which short-circuits a series connection of the energy storing element and an energy source connectable to the pair of input terminals. A converter for synchronized switch harvesting on inductor including such a rectifier circuit and a method for rectifying an electrical current generated by an energy source are also described.

Abstract: A power supply device (10) includes a plurality of constant current output circuits (14) that can supply power to a load (12). The constant current output circuit includes a pulse generation unit (20), and a PI feedback control unit (30) that performs feedback control on the pulse voltage output from the pulse generation unit. When an abnormality occurs in the constant current output circuit that supplies power to the load and the constant current output circuit that supplies power to the load is switched, a cycle of the feedback control, which is performed for the pulse generation unit of the constant current output circuit corresponding to a switching destination, is changed to a second cycle higher than a first cycle in the constant current output circuit that is not yet switched.

Abstract: Various embodiments of the invention provide for a double measurement technique to enable auto-calibration of a switching regulator. In certain embodiments, calibration is performed using a digital conversion circuit that adjusts an internal slope of an on-time generator by adjusting the peak value of a ramp to a desired peak voltage value. Auto-calibration allows for an optimal dynamic response across the entire switching frequency range of the switching regulator even in noisy environments.

Abstract: A switch controller for a variable output voltage power converter includes a pulse width modulator (PWM) output producing a pulsed signal for driving a power converter switch. A mode selector output is connected to a multiplier. A period selector output is connected to the multiplier and to a PWM input. The multiplier output is connected to another PWM input. A comparator output is connected to a period selector input. The period selector outputs a nominal cycle time to the PWM when an operating on-time state is greater than a minimum operating on-time. The period selector outputs an updated cycle time greater than the nominal cycle time when the operating on-time state is less than the minimum operating on-time causing the PWM to output a pulsed signal with the updated cycle time and a duty cycle equal to a duty cycle of an immediately preceding pulsed signal.

Abstract: A method for a DC to DC converter with a pseudo constant switching frequency is disclosed herein. For example, some embodiments provide a DC to DC converter having a switch connected to a switching node to control a voltage of the switching node, and a switching controller that is adapted to turn on and off the switch at a substantially constant frequency based at least in part on the voltage of the switching node. The switching controller includes a modulator connected to a control electrode of the switch and that is adapted to actuate and deactuate the switch, and a first timer that is connected to the switching node and to the modulator. The first timer uses the voltage of the switching node to determine an on-time for the switch.

Abstract: A method of operating a switched mode power supply circuit can be provided by determining an error in a control signal for the switched mode power supply circuit. The error can be compared to an error threshold value to provide a filtering selection. The error can be adaptively filtered of based on the filtering selection to provide a selected filtering and the error can be filtered using the selected filtering.

Abstract: A multiple phase dc to dc converter with a shared bootstrap capacitor. In an embodiment, a multiple phase buck converter is disclosed including a plurality of n switching stages, each coupled to a corresponding switching node, each further including a high side driver MOS device coupled between a terminal for a positive voltage supply terminal and the corresponding switching node; and an inductor coupled in parallel between the corresponding switching node and an output terminal configured for providing the DC output voltage; and high side driver control circuitry configured to selectively couple a shared bootstrap capacitor to a gate terminal of each of the high side drivers, wherein the shared bootstrap capacitor is configured to charge a gate capacitance of each of the high side driver MOS devices. Additional embodiments are disclosed.

Abstract: An electronic device can include a switch coupled to a switching node. In an embodiment, the switch has a breakdown voltage is less than 2.0 times the designed operating voltage. In another embodiment, the electronic device can further include another switch, wherein both switches are coupled to each other at a switching node. The switches can have different breakdown voltages. In a particular embodiment, either or both switches can include a field-effect transistor and a zener diode that are connected in parallel. The zener diode can be designed to breakdown at a relatively lower fraction of the designed operating voltage as compared to a conventional device. Embodiments can be used to reduce voltage overshoot and ringing at the switching node that may occur after changing the states of the first and second switches. Processes of forming the electronic device can be implemented without significant complexity.

Abstract: A method and device are disclosed for estimating a power demand level of an active circuit on a power supply line. A ripple amplitude and a ripple frequency associated with operation of the active circuit may be monitored on the power supply line. The ripple amplitude and ripple frequency may be compared with corresponding references. The ripple amplitude and ripple frequency may be associated with an estimated power demand level of the active circuit on the power supply line based on the comparison. A ripple generator generates a controlled ripple on the power supply line for calibration.

Abstract: The DC-DC converter includes an inductor cooperating with a first switch and a second switch operating alternately, in order to supply an output voltage of higher, equal or lower level than the level of an input voltage. The converter includes a switching control unit for the switches for determining a first switching time for the first switch and a second switching time for the second switch. The switching control unit includes a voltage-current conversion circuit for converting into current a comparison voltage, which is the difference between the output voltage and the input voltage, a first current being supplied by the conversion circuit for charging a first capacitor to a first voltage threshold to determine the first switching time and a second current being supplied by the conversion circuit for charging a second capacitor to a second voltage threshold to determine the second switching time.

Abstract: A voltage regulator for providing a constant voltage to a circuit is described in which a series regulator acts as the current source for a shunt regulator and the series regulator in turn is controlled by the current diverted from the output by the shunt regulator. The current being diverted by the shunt regulator is measured, either directly or by measuring a related operating parameter. When current below or above a certain desired amount is being diverted from the load by the shunt regulator, a signal is sent to the series regulator causing the series regulator to provide more or less current respectively, so that the shunt regulator again diverts the desired amount of current and the output voltage remains constant. This configuration results in efficiency near that of a series regulator while maintaining the better frequency response of a shunt regulator.

Abstract: An improved architecture for an implantable medical device using a primary battery is disclosed which reduces the circumstances in which the voltage of the primary battery is boosted, and hence reduces the power draw in the implant. The architecture includes a boost converter for selectively boosting the voltage of the primary battery and for supplying that boosted voltage to certain of the circuit blocks, including digital circuitry, analog circuitry, and memory. However, the boost converter is only used to boost the battery voltage when its magnitude is below a threshold; if above the threshold, the battery voltage is passed to the circuit blocks without boosting. Additionally, some circuitry capable of operation even at low battery voltages—including the telemetry tank circuitry and the compliance voltage generator—receives the battery voltage directly without boosting, and without regard to the current magnitude of the battery voltage.

Abstract: A regulated DC-DC switching converter includes a bypass mode in which ends of an output inductor are coupled together. Circuitry determines output capacitor current and load current components of output inductor current during operation of the switching converter, for use in controlling switching operations.

Abstract: An over-current protection circuit and a pulse width modulator having the same are provided. The pulse width module includes a high-side switch, a low-side switch, and a driving module. The driving module controls the high-side switch and the low-side switch according to a set signal and a reset signal periodically to adjust an inductive current flowing through the high-side switch and the low-side switch. When inductive current is the overcurrent during the minimum on time of the high-side switch, the over-current protection circuit turns off the high-side switch in a predefined time to decrease the inductive current continuously, so that the average current of the inductive current does not become too high to damage the pulse width module.

Abstract: Several circuits and methods for driver control of a switching circuit are disclosed. In an embodiment, a circuit for driver control of a switching circuit includes a driver circuit and a control circuit. The driver circuit is capable of being coupled to the switching circuit. The switching circuit includes a first switch and a second switch. The driver circuit is configured to control a conductive state of the switching circuit by facilitating an alternate state change of the first switch and the second switch. The control circuit is coupled to the driver circuit and is configured to detect a noise signal during a state change of the first switch. The control circuit is further configured to control the driver circuit to thereby slow down the state change of the first switch.

Abstract: Provided are a driving circuit and a display panel, the driving circuit comprises a voltage dividing module, a comparing module and a switching module, wherein the voltage dividing module has a first terminal connected to a first terminal of the switching module, a second terminal connected to a first terminal of the comparing module, and a third terminal serving as a grounding terminal; a second terminal of the comparing module is connected to a first voltage input terminal, third, fourth and fifth terminals of the comparing module are connected to three control terminals of the switching module respectively; the first terminal of the switching module is connected to a voltage output terminal, a second terminal of the switching module is connected to the first voltage input terminal, and third and fourth terminals of the switching module are connected to second and third voltage input terminal, respectively.

Abstract: A switching power-supply device configured to convert and output a first direct voltage supplied from an input power source to a second direct voltage by alternately turning on and off a first switching element connected to the input power source and a second switching element connected in series to the first switching element, the switching power-supply device includes a reference voltage generation unit; and a driving unit, wherein when a generation cycle of a timing becomes shorter than a first cycle, a reference voltage generation unit cause a slope of a ramp signal, which is to be superimposed with a first reference voltage, to become gentler than a case where a generation cycle of a timing is equal to or longer than the first cycle.

Abstract: A voltage regulator may comprise a high-side switch and a low-side switch for delivering electrical current to the at least one information handling resource, a high-side driver configured to drive a high-side driving voltage for regulating a first electrical current of the high-side switch, a low-side driver configured to drive a low-side driving voltage for regulating a second electrical current of the low-side switch, and a control circuit configured to operate the at least one voltage regulator in both of a fixed dead time mode and an adaptive dead time mode.

Abstract: A control circuit includes a detection circuit configured to detect a load current flowing into a load, and a setting circuit configured to set switching operations on first and second switch circuits according to the load current. The setting circuit is configured to cause both the first switch circuit and the second switch circuit to be in an off state, when a power supply stop signal is input from an outside, if the load current is in a first range, and to cause the first switch circuit to perform an on-off operation on the basis of the output voltage while causing the second switch circuit to be in the off state, if the load current is higher than a first reference value that is an upper limit of the first range.

Abstract: The present invention relates to an adaptable RF impedance translation circuit that includes a first group of inductive elements cascaded in series between an input and an output without any series switching elements, a second group of inductive elements cascaded in series, and a group of switching elements that are capable of electrically coupling the first group of inductive elements to the second group of inductive elements. Further, the adaptable RF impedance translation circuit includes at least one variable shunt capacitance circuit electrically coupled between a common reference and at least one connection node in the adaptable RF impedance translation circuit, which includes control circuitry to select either an OFF state or an ON state associated with each of the switching elements and to select a capacitance associated with each variable shunt capacitance circuit to control impedance translation characteristics of the adaptable RF impedance translation circuit.

Abstract: There is provided a switching regulator including an overcurrent protection circuit which is able to automatically return from an overcurrent state. The switching regulator includes an error amplification circuit which amplifies a difference between a feedback voltage and a reference voltage based on an output voltage and outputs the amplified difference; a PWM comparator which compares an output of the error amplification circuit with an output of a triangular wave oscillation circuit, and controls an output transistor; an overcurrent detection circuit which monitors a load current flowing through a load connected to an output terminal, detects that the load current is an overcurrent, and outputs an overcurrent detection signal causing a switching operation to stop; and a negative feedback control circuit which receives the overcurrent detection signal, and controls the load current to a predetermined current value.

Abstract: An output voltage controller includes a first controller which controls current supply to a inductor based on an output voltage, and a second controller which controls current supply to the inductor by controlling a period when an input end to which an input voltage is inputted, the inductor, and an output end from which the output voltage is outputted are coupled based on the input voltage.

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 signal modulating interface for a solid state electronic device includes an input arranged to receive a control signal from a driver arranged to control the solid state electronic device, and a signalling module connected to the input wherein the signalling module is arranged to generate a modulated control signal by eliminating unwanted triggering signal portions capable of false triggering the solid state electronic device from the control signal for transmission to the solid state electronic device.

Abstract: A synchronous direct current (DC)-DC buck converter and a method of controlling the waveforms of switching signals disclosed herein. The synchronous DC-DC buck converter generates a stepped-down output voltage using a first switch configured to apply an input voltage to an inductor and a second switch configured to switch in response to a second switching signal. The synchronous DC-DC buck converter includes a sawtooth generation unit, a driver oscillating signal generation unit, a switching signal generation unit, and a phase tracking unit. The sawtooth generation unit generates a sawtooth wave. The driver oscillating signal generation unit generates an error voltage between the output voltage and a reference voltage, and compares the sawtooth wave with the error voltage, so as to generate a driver oscillating signal. The switching signal generation unit generates each of the first and second switching signals. The phase tracking unit generates the frequency setting signal.

Abstract: The invention discloses an automatic voltage conversion system based on a singlechip, comprising a control unit, a power circuit unit, a transformer unit, a voltage sampling unit, an output protection unit and a voltage switching unit; wherein, the power circuit unit provides suitable working voltage for the whole circuit; the voltage sampling switching units are respectively connected to the control unit; the transformer unit is connected to the voltage switching unit; the output protection unit input is connected to the control unit, and output protection unit output is connected to the transformer unit; and the control unit, as a control system based on a singlechip, is used for controlling operation of both the voltage switching and output protection units after processing the signal gathered by the voltage sampling unit. The system can perform automatic voltage conversion, and high and low input voltage protection and provide transformer over temperature protection.

Abstract: A DC-DC converter converts an input voltage into an output voltage and includes an input terminal, an output terminal, a power stage, a switch driving circuit, a charge pump, and a capacitor. The power stage includes a high-side switch, a low-side switch and an inductor. The switch driving circuit generates a high-side switch driving signal and a low-side switch driving signal. The charge pump generates a first polarity current according to the high-side switch driving signal, and generates a second polarity current having an opposite polarity to the first polarity current according to the low-side switch driving signal. The capacitor generates a first voltage by integrating the first and second polarity currents generated by the charge pump. The switch driving circuit generates the high-side switch driving signal and the low-side switch driving signal according to a difference between the first voltage and a reference voltage.

Abstract: A measured voltage drop across a power-line transistor is used as a sensing element to measure the current and detect an over-current condition for an LED backlight system. An over-current or short condition is detected when the measured voltage drop exceeds a threshold. Accurate detection of the over-current condition is achieved by calibrating the RDS-ON (i.e., internal resistance between drain and source, when transistor is on) of the power-line transistor. In one embodiment, the calibration of RDS-ON is performed by ramping down the threshold from an initial value and using the tripped threshold to determine the actual value for RDS-ON. In another embodiment, the calibration of RDS-ON is performed by using two thresholds, a first threshold to calibrate RDS-ON and a second threshold to detect the over-current condition.

Abstract: Various embodiments of the invention improve the dynamic response and output voltage accuracy in buck DC-DC converters. In certain embodiments, power efficiency is improved by storing and recycling energy that is otherwise lost during successive load transient events.

Abstract: A highly efficient power supply unit compatible with a single-phase three-wire system and an operating method of such a power supply unit are provided. The power supply unit includes first and second switching legs connected in parallel to a first capacitor leg with a DC power supply connected thereto. One end of the second capacitor leg is connected to the middle point of the first switching leg through a first inductor, and the other end is connected to the middle point of the second switching leg through a second inductor. The two ends of the second capacitor leg and the middle point of the second capacitor leg are defined as AC terminals. A switch is provided between middle points of first and second capacitor legs. A control part sets the switch to OFF when power is input/output only between one end of the second capacitor leg and the other end.

Abstract: A high voltage inverter device uses, as an input voltage (Vin), a DC voltage or a voltage composed of a DC component with a pulsating current superposed thereon, switches the input voltage by a switching element (Qsw) to apply an exciting current to an excitation winding (NP) of a resonant transformer (10) and output an alternating-current high voltage (Vout) from an output winding (NS) of the resonant transformer. An abnormal voltage detection circuit (7) including a varistor (12) detects an abnormal voltage generated in the excitation winding (NP) of the resonant transformer (10), and when the abnormal voltage is detected, its signal is transmitted by a photocoupler (11) to a control circuit (20), thereby causing the control circuit (20) to stop its oscillation operation to stop a switching operation of the switching element (Qsw).

Abstract: A current control device capable of performing widely applicable failure detection without a motor rotation speed sensor is provided. A current control semiconductor element includes, on a same semiconductor chip, a transistor that drives load, a current detection circuit that detects current of the load, a compensator that calculates an on-duty of the transistor from a current command value and a current value output from the current detection circuit, and a PWM timer that generates a pulse turning on the transistor on the basis of the on-duty. A microcontroller sends the current command value to the current control semiconductor element, receives the current value output from the current detection circuit and the on-duty output from the compensator from the current control semiconductor element, and detects failure of the current control semiconductor element on the basis of the received current value and on-duty.

Abstract: A controller for controlling operation of a switching regulator including a modulator, a discontinuous conduction mode (DCM) controller, an audible DCM (ADCM) controller, and a sub-sonic discontinuous conduction mode (SBDCM) controller. The modulator generally operates in a continuous conduction mode. The DCM controller modifies operation to DCM during low loads. The ADCM controller detects when the switching frequency is less than a super-sonic frequency threshold and modifies operation to maintain the switching frequency at a super-sonic frequency level. The SBDCM controller detects a sub-sonic operating condition during ADCM operation and responsively inhibits operation of the ADCM mode controller to allow a SBDCM mode within a sub-sonic switching frequency range. The SBDCM operating mode allows for efficient connected standby operation. The SBDCM controller allows operation to return to other modes when the switching frequency increases above the sub-sonic level.

Abstract: A control circuit of a power converter includes: a periodical signal generating circuit for generating a first filtered signal, a second filtered signal, and a periodical signal according to a second feedback signal corresponding to an inductor voltage of the power converter; a comparison circuit for comparing the error signal and the periodical signal to generate a comparison signal; a control signal generating circuit for generating a control signal to control power switches of the power converter according to the comparison signal; and a signal adjusting circuit. During a load transient period at which the load of the power converter changes from a relatively light load to a relatively heavy load, when a lower switch of the power converter is turned on, the signal adjusting circuit reduces an output current of the periodical signal generating circuit to increase a loop response of the power converter.

Abstract: A multi-output DC to DC converter can have complex control requirements in CCM mode because of the differing load requirements of the outputs. A multi-output DC to DC converter having a single coil or inductor and a freewheel switch is described. A controller measures the duration of the freewheel phase. The controller increases the current supplied to the DC to DC converter in the following duty-cycle if the duration is less than a first value, and decreases the current supplied to the inductor in the following duty-cycle if the duration is greater than a second value.

Abstract: A controller for use in a power converter includes a load sensing circuit coupled to output an error signal in response to a feedback signal representative of an output of the power converter. The error signal is representative of a load coupled to an output of the power converter. A burst mode control circuit is coupled to output a burst mode control signal in response to the error signal. An offset current generator circuit is coupled to output an offset current in response to the error signal. A drive circuit is coupled to control switching of a power switch to control a transfer of energy from an input of the power converter to the output of the power converter in response to the error signal, the burst mode control signal, the offset current, and a current sense signal representative of a current through the power switch.

Abstract: A boost converter is provided for tracking change in input voltage. The boost converter comprises at least one input for connection to a DC voltage source for supplying an input voltage; at least one output configured to supply an output voltage having a value that is greater than a value of said input voltage by at least a predetermined offset value; feedback means adapted to provide a feedback voltage, based on said output voltage, to a switching element of said boost converter, and a feedback voltage regulator means adapted to combine said feedback voltage with an input voltage characteristic so as to adjust said output voltage to be offset and proportional to said input voltage characteristic.

Abstract: In one embodiment, a method of forming a conditioning circuit includes configuring an output biasing network to provide a biasing voltage to an MOS transistor to enable the MOS transistor to operate in a saturated operating mode for input voltages that are less than a threshold voltage.