Abstract: The present disclosure provides examples of a voltage regulator for a Radio Frequency Identification tag circuit. The voltage regulator includes a pair of native transistors. A first native transistor is coupled to a reference voltage and biased to saturation. A resistive element coupled between the gate and the drain of the transistor ensures a sufficient voltage difference between the source and the drain of the first native transistor. The second native transistor, with a gate coupled to the gate of the first native transistor, outputs a regulated voltage.

Abstract: A voltage converter connectable to a power source (PS) and a load (LD) provides a regulated output voltage (Vout) from a voltage (Vin) power source by switchable current paths including an inductive element (L). The voltage converter includes a plurality of switching elements for switching the current paths of the voltage converter as a forward-phase current path when the input voltage corresponds to the output voltage, as an up-phase current path when the input voltage is lower than the output voltage, and as a down-phase current path when the input voltage is higher than the output voltage. A central controller controls a switching state of the plurality of switching elements, a current sensing unit including a comparator for sensing a current flowing through at least one of the switching elements, and a plurality of processing units for processing the current sensing.

Abstract: A switch mode power converter that precisely controls average switching current and operating frequency. The switching control operative in hysteretic average current mode control provides wide bandwidth operation without the need for slope correction. The switching converter ripple current is varied by a frequency comparator in response to a comparison of the switching frequency to a reference frequency. The ripple current is adjusted to obtain correlation between the operating switching frequency and the reference frequency. Peak current levels are precisely controlled and may be limited to prevent component stress levels from being exceeded. Current levels are continuously monitored with a current sense amplifier, or monitored with a high-gain low energy current sampler. Feedback loop independent line and load regulation is provided by continuous current monitoring, or by using variable slope charge and transfer voltage to pulse width converters when operating with a current sampler based system.

Abstract: A step-down switching regulator prevents an output voltage undershoot and enables a quick lowering of an output voltage immediately after turning off of power supply. The step-down switching regulator includes an NMOS transistor connected between an output terminal and a ground voltage and another NMOS transistor connected in parallel with a synchronous rectification transistor. Upon reception of an on/off signal for terminating the operation of the switching regulator, the NMOS transistors are turned on into an on-state.

Abstract: In a power supply device, a synchronous rectifier step-down converter alternately turns on and off a switch and a synchronous rectifier switch. A reference voltage generator generates a predetermined reference voltage. An error amplifier outputs an error voltage such that an output voltage of the step-down converter approaches the predetermined reference voltage. A pulse-width signal generator generates a pulse-width signal controlling turning on and off the switch and the synchronous rectifier switch based on the error voltage. A driver circuit controls turning on and off the switch and the synchronous rectifier switch based on the pulse-width signal. An inductor is connected in series with output of the step-down converter. A bypass switch short-circuits an output terminal of the step-down converter to an input terminal of the step-down converter. A mode controller controls turning on and off the bypass switch.

Abstract: A voltage converting circuit including a power stage, a filter, a comparator, a first and a second feedback units. The power stage receives an input voltage and outputs the input voltage according to a duty cycle. The filter receives the input voltage to convert the input voltage into a current, and filters the current to obtain an output voltage. The first feedback unit amplifies a difference between a reference voltage and the output voltage to obtain an error voltage. The second feedback unit calculates the quadratic differential and integration of the output voltage to obtain a sensing voltage. The comparator compares the error voltage and the sensing voltage, and outputs a comparing result to adjust a duty ratio. Herein, a ripple of the output voltage is linearly proportional to that of the current, and DC divided voltage level of the output voltage is substantially equal to the reference voltage.

Abstract: A voltage regulator has a switch configured to alternately couple and decouple a voltage source through an inductor to a load, feedback circuitry to generate a feedback current, a current sensor configured to measure the feedback current, and a controller configured to receive the feedback current measurement from the current sensor and, in response thereto, to control a duty cycle of the switch. The feedback circuitry includes an amplifier having a first input configured to receive a desired voltage, a second input, and an output, a capacitor connecting the second input to the output of the amplifier, and a resistor connecting the output of the amplifier and the output terminal such that a feedback current proportional to a difference between the desired voltage and an output voltage at an output terminal flows through the resistor.

Abstract: A circuit for monitoring the inductance value of a switching regulator is provided. The circuit includes an inductance sensor circuit that is coupled to a switch node of a switching regulator. The inductor sensor circuit includes a switch, a ramp circuit, and a comparison circuit. The switch is arranged to receive a switch control signal that is based, at least in part, on a switching signal of the switching regulator. When the switch control signal is asserted, the comparison circuit receives a comparison input voltage that is based, at least in part, on the inductance value of the switching regulator. The comparison circuit compares the comparison input voltage to a ramp voltage of the ramp circuit and outputs a signal indicative of whether the inductance value of the switching regulator is at or below a predetermined threshold inductance value.

Abstract: A switching regulator for fixing a frequency which includes a power stage circuit, for receiving an input voltage and outputting an output voltage according to an control signal; a reference voltage generator for generating a reference voltage; a comparator for outputting a comparing result according to the output voltage and the reference voltage; a constant-time trigger circuit for outputting the control signal according to the comparing result and a compensating signal; an a frequency compensator for outputting the compensating signal according to the output voltage and a phase signal; wherein the phase signal is corresponding to the magnitude of the voltage across the lower gate switch of the power stage circuit.

Abstract: A control apparatus for controlling a fuel pump includes: an electronic switch provided in a circuit for connecting a power supply to a motor for driving the fuel pump; a current detector which detects a current which flows through the motor; and a controller which controls the electronic switch in a first PWM mode of a first frequency and a first duty ratio in a normal operation; and change a PWM mode to control the electronic switch in a second PWM mode of a second frequency lower than the first frequency and a second duty ratio lower than the first duty ratio when the current flowing through the motor exceeds a threshold current value in the normal operation.

Abstract: A switching controller for a boost power converter includes a switching-control circuit and a programmable feedback circuit. The programmable feedback circuit is coupled to an output of the boost power converter via a voltage divider. The programmable feedback circuit includes a current source coupled to a switch. On a light-load condition, a power-saving signal turns on the switch. The switch will conduct a programming current supplied by the current source toward the voltage divider. Furthermore, the voltage divider is externally adjustable for programming a determined level of an output voltage of the boost power converter on the light-load condition. Additionally the present invention increases system design flexibility to meet practical power-saving requirements without adding circuitries and increasing cost.

Abstract: Switching regulator circuits and methods are provided for regulating output voltage that include an adjustable minimum peak inductor current level and adjustable burst comparator hysteresis for Burst Mode operation in switching regulators. Control over minimum peak inductor current level and burst comparator hysteresis is achieved during Burst Mode operation by allowing external user control of the burst threshold level and the burst comparator hysteresis. A single user-accessible input pin, two user-accessible input pins, or three user-accessible input pins may be used to distinguish between forced continuous and Burst Mode operations, set a burst threshold level, and set a burst comparator hysteresis during Burst Mode operation. The present invention may be applied to buck, boost, buck-boost, or any other suitable regulator circuit configuration. The present invention also may be employed with synchronous and non-synchronous switching regulators.

Abstract: A driving circuit for a half bridge utilizing bidirectional semiconductor switches in accordance with an embodiment of the present application includes a high side driver operable to control a high side bidirectional semiconductor switch, wherein the high side driver provides a negative bias voltage to the bidirectional semiconductor switch to turn the high side bidirectional semiconductor switch OFF. A low side driver may be operable to control a low side bidirectional semiconductor switch. An external voltage source with a negative terminal of the voltage source connected to the high side driver may be provided. A high side driving switch may be positioned between the negative terminal of the voltage source and the high side driver and operable to connect the high side driver to the negative terminal of the voltage source when the low side driver turns the low side bidirectional semiconductor switch ON.

Abstract: A regulated power supply includes an inverter comprising an upper switch and a lower switch that are connected in series. A control module selectively controls the upper switch and the lower switch in one of a pulse width modulation (PWM) mode and a discrete control mode (DCM), receives a feedback signal from an output of the regulated power supply, and switches between the PWM mode and the DCM based on the feedback signal.

Abstract: In general, in one aspect, the disclosure describes a voltage regulator (VR) that includes a first amplifier receiving a first reference voltage and a feedback voltage as inputs. A second amplifier receiving a second reference voltage and an output of the first amplifier as inputs. A drive component (e.g., transistor(s)) coupled to the second amplifier to drive current to an output based on an output of the second amplifier. A shunt component (e.g., transistor(s)) coupled to the first amplifier to shunt current from the output based on the output of the first amplifier. Current variations in the shunt component are controlled.

Abstract: A power converter (1) comprises a voltage level increasing circuit (3) which receives a DC-input voltage (VIN) between first and second power converter inputs (IN1, IN2), and which has an output (O1; O2, O3) to supply an adapted input voltage having either a higher level than the input voltage (VIN) or a polarity opposite to the input voltage (VIN). A down-converter (2) has first and second down-converter inputs (IN3, IN4), a control switch (S1) with a main current path arranged between a first node (N1) and the first downconverter input (IN3), an inductor (L) arranged between the first node (N1) and a load (LO), and a sync switch (S2) arranged between the first node (N1) and the second down-converter input (IN4). A controller (4) controls the control switch (S1), and switches (S3, S4; S3, S4, S5, S6, S7, S8) of the voltage level increasing circuit (3) for either coupling the input voltage (VIN) or the adapted input voltage to the first node (N1) or to the first or second downconverter inputs (IN3, IN4).

Abstract: A method for providing non-resonant zero-current switching in a switching power converter operating in a continuous current mode. The switching power converter converts power from input power to output power. The switching power converter includes a main switch connected to a main inductor, wherein an auxiliary inductor is connectible with the main inductor. The main current flows from an input to an output. The auxiliary inductor is connected with the main inductor thereby charging the auxiliary inductor so that an auxiliary current flows from the output to the input opposing the main current. Upon a total current including a sum of the main current and the auxiliary current. substantially equals or approaches zero, the switch is turned on.

Abstract: Voltage regulating systems are provided that adjust their output control signals in response to feed-forward information that is indicative of deterministic changes in the load current. A feed-forward circuit provides a feed-forward signal in response to an input signal generated from a source that is external to the voltage regulating system. The voltage regulator systems can proactively respond to the predictive information by adjusting their output, thereby improving the regulation tolerance to dynamic loading. As an example, the feed-forward information can include signals indicating multiple deterministic events that affect the load. Signals from multiple events can be summed together to generate a feed-forward term. As another example, the voltage regulating systems can be responsive to feedback information and feed-forward information from internal to the regulator, in addition to external deterministic information.

Abstract: A method of preventing the Rdson of a III-V Nitride power switching circuit from varying over time. The method includes biasing the switch to a pre-bias voltage level just below turn ON when the switch is OFF, wherein traps are discharged when the switch is biased to the pre-bias voltage level just below turn ON and the varying of the Rdson over time due to traps is reduced. The method can be employed in DC-DC converter circuits having III-V Nitride control and synchronous switches connected at a switching node.

Abstract: In an embodiment, a power converter system is provided for AC voltage regulation. The power converter system receives an AC input voltage at an input terminal and provides an AC output voltage to a load at an output terminal. A main bi-directional switch is coupled between the input terminal and the output terminal. The main bi-directional switch is operable to control the provision of the AC output voltage. A reactive current flows through the main bi-directional switch if the load is reactive. An auxiliary bi-directional switch is coupled to the output terminal. The auxiliary bi-directional switch is operable to circulate the reactive current due to the reactive load, thereby reducing any voltage spikes in the power converter system.

Abstract: An output voltage VC obtained by boosting an input voltage VIN by means of a charge pump control circuit 3 of a charge pump 102 is supplied as a power supply voltage to a control circuit 4 of a step-up converter. It is thus possible to eliminate the need for a conventional self-bias method, eliminate switching from startup oscillation to main oscillation of the conventional self-bias method upon startup, and overcome problems caused by the switching of oscillation states, thereby achieving switching power supply circuitry starting in a reliable and stable manner.

Abstract: A delay applied to a turn-on time for a high side switch in a switch mode power converter prevents oscillation between continuous and discontinuous conduction modes under light load conditions. The delay equalizes turn-on time for a high side switch with respect to continuous and discontinuous modes, so that turn-on time is not treated differently between the different modes. The delay value can be set for be equivalent to a propagation delay through a driver for a low side switch, in addition to a turn-off time for the low side switch. The addition of the delay element tends to maintain the switch mode power converter in a discontinuous mode under light load conditions and avoids oscillation between discontinuous and continuous conduction modes.

Abstract: A driving circuit for a half bridge utilizing bidirectional semiconductor switches in accordance with an embodiment of the present application includes a high side driver operable to control a high side bidirectional semiconductor switch, wherein the high side driver provides a negative bias voltage to the bidirectional semiconductor switch to turn the high side bidirectional semiconductor switch OFF. A low side driver may be operable to control a low side bidirectional semiconductor switch. An external voltage source with a negative terminal of the voltage source connected to the high side driver may be provided. A high side driving switch may be positioned between the negative terminal of the voltage source and the high side driver and operable to connect the high side driver to the negative terminal of the voltage source when the low side driver turns the low side bidirectional semiconductor switch ON.

Abstract: One embodiment of the invention includes an on-chip current-sense system for measuring a magnitude of an output current through a power transistor. The system includes a first sense transistor that conducts a first reference current to or from a phase node and a second sense transistor configured to conduct a second reference current to or from a power rail. The first and second sense transistors can be substantially identical and can be proportionally matched to the power transistor. An OTA receives the first and second reference currents and a third reference current that flows to or from the phase node and generates a sense current that is proportional to the output current in response to the first, second, and third reference currents. A sense circuit compares the sense current with a predetermined magnitude and generates an over-current signal in response to the sense current being greater than the predetermined magnitude to indicate an over-current condition of the output current.

Abstract: An analog variable-frequency controller includes a first current generator, a second current generator, a clock generator and a light/heavy load selector. The first and second current generator receive a load current signal and then output a first voltage signal and a second voltage signal, respectively. The clock generator generates a corresponding switching frequency according to the first voltage signal or the second voltage signal. The light/heavy load selector, connected with the first current generator, the second current generator and the clock generator, receives a control signal for controlling the clock generator to receive the first voltage signal or the second voltage signal. The abovementioned controller is implemented by an analog circuit, which has a lower circuit complexity, lower cost and is easy to be integrated into a switching converter.

Abstract: Unlike buck converter and tapped-inductor buck converters, which use only inductive energy transfer, the present invention employs the capacitive energy transfer in addition to inductive energy transfer. The hybrid transformer performs the double duty simultaneously: transfers the input inductive energy storage to the load through a taped-inductor turns ratio n but also transfers the resonant capacitor discharge current to the load during OFF-time interval amplified by turns ratio m of the hybrid transformer. Despite the presence of the resonant inductor current during the OFF-time interval, the output voltage is neither dependent on resonant component values nor on the load current as in conventional resonant converters but depends on duty ratio D and turns ratio n of the hybrid transformer. Hence a simple regulation of output voltage is achieved using duty ratio control.

Abstract: A mode control method and apparatus for a switching regulator is disclosed. The method receives an input signal and amplifying the input signal to get an amplified signal. The amplified signal is sent to a sample circuit to get a sample signal. The sample signal is delivered to an averaging circuit to get an averaged sensed output signal. The averaged sensed output signal is compared with a first pre-determined threshold or an second pre-determined threshold to get a PWM enable signal. The appropriate mode is determined based on the PWM enable signal.

Abstract: A step-up DC-DC converter is disclosed that is capable of high efficiency power conversion under both a heavy load condition and a light load condition. The step-up DC-DC converter includes a direct current power source, an inductor, a first switching element, a second switching element, a smoothing capacitor, a driver controller for controlling switching ON or switching OFF the first switching element and the second switching element, and a control changing unit for changing a control operation of the driver controller according to a load current. According to an output from the control changing unit, the driver controller performs one of an operation of switching OFF the second switching element and an operation of switching ON or switching OFF the second switching element.

Abstract: A method of providing threshold voltage monitoring and control in synchronous power converters is disclosed. The method establishes a threshold voltage level for at least one of an upper gate and a lower gate power switch in a synchronous power converter. The threshold voltage levels indicate switching delay times are present in the upper and lower gate power switches. The method detects body diode conduction levels for both the upper and lower gate power switches. When at least one of the detected body diode conduction levels exceed a prescribed body diode conduction level, the method adjusts the threshold voltage level for at least one of the upper and lower gate power switches to reduce a body diode conduction time for the at least one of the upper and lower gate power switches.

Abstract: A power supply configuration includes a monitor circuit to monitor an output voltage and output current of a power supply. The output voltage can be used to supply power to a dynamic load. The power supply varies a rate of changing an adaptive output voltage reference value that tracks the output voltage. Based on a comparison of the output voltage with respect to the adaptive output voltage reference voltage value, a controller associated with the power supply controls switching operation of the power supply to maintain the output voltage within a voltage range. For example, modifying the rate of changing the adaptive output voltage reference value over time depending on current operating conditions of the power supply changes a responsiveness and ability of the power supply to provide current to the dynamic load.

Abstract: A power supply includes a first switch to establish a first path to charge an output of the power supply by a voltage source, a second switch to establish a second path to discharge the output, and a third switch connected between the output and a capacitor. When to discharge the output, the third switch is turned on before the second switch turns on, to transfer a portion of energy on the output to the capacitor. When to charge the output, the third switch is turned on before the first switch turns on, to transfer a portion of the energy on the capacitor to the output.

Abstract: During burst mode operation of a four switch buck-boost converter, the input voltage and an output voltage can be detected and a preset peak charging current threshold level can be modulated when the difference between the input voltage and output voltage is within a prescribed range. A burst mode charging cycle will progress until the modulated peak charging threshold level is attained and cut off at the set peak level. A charge transfer cycle and discharge cycle may proceed thereafter.

Abstract: A control circuit for use in controlling a phase of a multi-phase voltage converter in accordance with an embodiment of the present invention includes a driver operable to provide a first control signal to a high side switch of a half-bridge of the phase and a second control signal to a low side switch of the half bridge, such that a desired output voltage is provided by the phase, current sensing circuitry operable to detect the output current of the phase, a comparator operable to compare the output current to a threshold current value and a disabling device operable to provide an enable/disable signal to disable the driver when the output current is below the threshold current value.

Abstract: Circuit and method for controlling a high bridge circuit with increased efficiency is disclosed. Circuitry is provided outputting gating signals to a high side driver and a low side driver responsive to a time varying input signal. A frequency measurement circuit determines a high speed mode when the input signal is at a frequency above a threshold, and the gating signal to the high side driver is inhibited. When the input signal frequency is below the threshold, the low side driver and the high side driver gating signals switch alternately. In an exemplary implementation, the frequency measurement circuit is provided as two counters outputting signals to a decision circuit which controls the half bridge circuit. Methods are provided for efficiently providing gating signals to the drivers of a half bridge circuit based upon the frequency of the input signal.

Abstract: A switch-mode DC/DC converter and a linear low drop out (LDO) DC/DC regulator are connected in parallel to drive a single load. Both regulators share a common voltage reference, feedback network, input supply and output such that the regulated voltage is identical during each mode of operation. During heavy loads the switch-mode regulator is in operation and the linear regulator is disabled for the highest efficiency possible. Conversely at light loads the linear regulator is in operation with the switch-mode regulator disabled, also maximizing the efficiency. Each regulator senses load current to automatically transition between the appropriate voltage regulators at fixed load current levels. The presented invention also includes a make before break transition scheme of the voltage regulators to minimize the voltage transients.

Abstract: One embodiment of the invention includes a power regulator system. The system includes a switching system configured to generate an output voltage across a load based on a high-side switch coupling a power voltage to an output at an edge-trigger of a PWM control signal having an activation pulse-width of the high-side switch. The system also includes a switch driver system configured to set a duty-cycle of the PWM control signal such that the activation pulse-width of the PWM control signal is based on the power regulator system operating in one of a continuous conduction mode (CCM) and a discontinuous conduction mode (DCM). The edge-trigger of the PWM control signal can occur based on a relative magnitude of the output voltage and the power voltage while operating in the DCM.

Abstract: A regulator is provided. The regulator is a PWM-based switching regulator with soft-start. The regulator starts up with non-synchronously-rectified regulation. A soft-start done signal is asserted after soft-start is finished. In one embodiment, the soft-start done signal is asserted at about 150% of the soft-start time. After the soft-start done signal has been asserted, the regulator changes from non-synchronously-rectified regulation to synchronously-rectified regulation if a pre-determined period of time occurs with no zero-crossing in the inductor current. In one embodiment, the pre-determined period of time is one switching cycle. In some embodiments, the “zero-crossing” of the inductor current is slightly different from zero, such as ?0.5 A.

Abstract: A power arrangement that includes a monolithically integrated III-nitride power stage having III-nitride power switches and III-nitride driver switches.

Abstract: Some of the embodiments of the present invention provide a voltage regulator comprising a first driver, a second driver, and a controller configured to control the first driver and the second driver to selectably operate in one of a plurality of operating modes, including an external driver mode and an internal driver mode, wherein which one of the plurality of operating modes is selected is based on presence or absence of one or more external drivers. Other embodiments are also described and claimed.

Abstract: A synchronous switching voltage regulator circuit is provided. After the first PWM pulse or at the end of a soft-start, a gradual transition is made from asynchronous rectification to fully synchronous rectification. The gradual transition to synchronous rectification is made by gradually increasing the time that the synchronous switch is enabled to be on.

Abstract: In one or more embodiments, a switched mode power supply circuit is configured to monitor and control its output voltage during discontinuous conduction mode (DCM) operation, to prevent output over-voltage conditions. For example, in one embodiment, a switched mode power supply circuit is configured to operate selectively in continuous conduction mode (CCM) and discontinuous conduction mode (DCM), and it includes a control circuit that is configured to detect an output over-voltage condition during DCM operation. The control circuit reduces the output voltage of the switched mode power supply circuit responsive to detecting the output over-voltage condition, such as by activating a pull-down device and/or temporarily reverting the switched mode power supply circuit to continuous conduction mode (CCM) operation.

Abstract: A torque control circuit includes a motor driving circuit, a motor operating current detection circuit, a reference voltage generation circuit, a maximum motor current setting circuit, a torque setting circuit, an information output circuit, a regulated-voltage power supply circuit, a motor operating temperature detection circuit, and a control circuit. The control circuit includes an integrated circuit to carry out functions of reading information detection sources, processing, and instruction for execution of torque control and output terminals of the reference voltage generation circuit, the maximum motor current setting circuit, the motor operating temperature detection circuit, and the motor impedance torque setting circuit are respectively connected to corresponding input terminals of the integrated circuit to carry out desired control of torque supplied to the impact tool.

Abstract: In a preferred embodiment for use in step-down (buck) DC-DC converters that may operate, at least part of the time, at high duty cycles (>50%), the power dissipation in the high side switch is effectively monitored and the switching frequency of the converter is lowered as needed to keep the sum of the conduction losses and switching losses in the high side switch substantially constant. In another embodiment, the ideal switching frequency is approximated. In still another embodiment having the switches integrated with the controller, the die temperature is monitored, and switching frequency, output current or both are varied to limit the die temperature.

Abstract: An electronic circuit combines a synchronous switching regulator circuit with an overvoltage detection circuit. The overvoltage detection circuit is configured to generate an overvoltage signal capable of an overvoltage state indicative of a power supply voltage being above a predetermined threshold voltage. The switching regulator circuit is coupled to receive the overvoltage signal. The switching regulator is also configured, in response to the overvoltage signal being in the overvoltage state, to generate a first control signal resulting in at least one of two series coupled transistors being in an off condition.

Abstract: In an embodiment, a power converter system is provided for AC voltage regulation. The power converter system receives an AC input voltage at an input terminal and provides an AC output voltage to a load at an output terminal. A main bi-directional switch is coupled between the input terminal and the output terminal. The main bi-directional switch is operable to control the provision of the AC output voltage. A reactive current flows through the main bi-directional switch if the load is reactive. An auxiliary bi-directional switch is coupled to the output terminal. The auxiliary bi-directional switch is operable to circulate the reactive current due to the reactive load, thereby reducing any voltage spikes in the power converter system.

Abstract: A switching regulator circuit is provided for operation as a switching device in a switching mode and as a passive device in a passive mode. A controller is provided for operating the circuit in a switching mode and a passive mode. Additionally, a single transistor is provided for operating as a switching device in the switching mode and for further operating as a passive device in the passive mode.

Abstract: A method for optimizing operation of a feedback system may include generating a control signal according to a control parameter, regulating an output of the feedback system via the control signal, and monitoring the control parameter. In response to the monitoring indicating that the present value of the control parameter is outside a specific range of values, a first parameter that impacts an operating characteristic of the feedback system may be adjusted until the present value of the control parameter is within the specific range of values. The specific range of values of the control parameter may correspond to a target level of the operating characteristic of the feedback system with respect to the first parameter.

Abstract: A current-sensing and correction circuit having programmable temperature compensation circuitry that is incorporated into a pulse width modulation controller of a buck mode DC—DC converter. The front end of the controller contains a sense amplifier, having an input coupled via a current feedback resistor to a common output node of the converter. The impedance of a MOSFET, the current through which is sampled by a sample and hold circuit is controlled by the sense amplifier unit. A sensed current correction circuit is coupled between the sample and hold circuit and the controller, and is operative to supply to the controller a correction current having a deterministic temperature-compensating relationship to the sensed current. The ratio of correction current to sensed current equals a value of one at a predetermined temperature, and has other values at temperatures other than at that temperature.

Abstract: A low-dropout regulator with a single-transistor-control providing improved transient response and stability is disclosed. The single-transistor-control provides a dynamic resistance at the output of the regulator for minimizing undershoot and overshoot, and hence improves transient response. Since the single-control transistor reduces the output resistance of the regulator, the output pole is pushed to a sufficiently high frequency without affecting stability. Therefore, the limited choice of combinations of the output capacitance and its equivalent-series-resistance is substantially relaxed.

Abstract: A DC to DC buck pulse width modulator converter circuit includes an input, a high side output and a low side output. A high side switch is electrically connected between a common output node and a voltage supply, and controls a flow of current therethrough dependent upon the high side output. A low side switch is electrically connected between the common output node and ground, and controls a flow of current therethrough dependent upon the low side output. A virtual ground amplifier includes a second input electrically connected to ground. A current feedback resistor is electrically connected intermediate the common output node and a first input of the virtual ground amplifier. A variable impedance component is electrically connected to an output of the virtual ground amplifier and to the first input of the virtual ground amplifier. The impedance of the variable impedance component is varied dependent upon the output of the virtual ground amplifier.