Abstract: An energy storage system that includes an uninterruptible power supply configured to supply first power to a load and a battery array comprising a backup battery unit. The system further includes a controller to cut off the first power supplied by the uninterruptible power supply at a first time and control the uninterruptible power supply and the battery array to supply second power to the load using power stored in the battery array. Typically, the second power is supplied when the first power is cut off.

Abstract: A voltage regulator includes a feedback regulation loop and a drive transistor configured to source current to a regulated output. A transient recovery circuit is coupled to the voltage regulator circuit and includes a first transistor coupled to source current into a control terminal of the drive transistor, wherein the source current is in addition to current sourced in response to operation of the feedback regulation loop. The first transistor is selectively actuated in response to a drop in voltage at the regulated output. The transient recovery circuit further includes a second transistor coupled to sink current from the regulated output. The sink current has a first non-zero magnitude in the quiescent operating mode of the regulator circuit. In response to an increase in voltage at the regulated output, the operation of the second transistor is modified to increase the sink current to a second, greater, non-zero magnitude.

Abstract: A synchronous regulator controller, including a synchronous switch that is coupled between a first node and a second node. The controller also includes a first voltage divider that includes a first resistive device that is coupled between the first node and a third node, and a second resistive device that is coupled between the third node and a second node. The controller also includes a comparator having a first input that is coupled to the first node, and a second input that is coupled to a forth node. The controller also includes a current source that is arranged to provide a current to the fourth node. The controller also includes a third resistive device that is coupled between the third node and the fourth node.

Abstract: A regulator circuit includes a power transistor, a current mirror, a first NMOS transistor, a second NMOS transistor and a current source. The power transistor has a source connected to an external power supply voltage supply, a gate connected to a first node having a first voltage and a drain connected to a second node outputting an internal power supply voltage. A current mirror provides a first current to a third node having a second voltage and provides a first node with a second current. A first NMOS transistor has a drain connected to a first node, a gate receiving a first reference voltage and a source connected to a fourth node. A second NMOS transistor has a drain connected to a third node, a gate connected to a second node and a source connected to the fourth node.

Abstract: A charge pump driven Linear Voltage Regulator (LVR) system with a cascoded n-type output pass device includes an error amplifier; a voltage feedback network; a dynamically controlled charge pump block that is ON only when required and OFF otherwise; a gate drive system configured to ensure that the charge pump drives only gate of a cascode transistor and no DC or static current load such that a voltage is preserved for a duration; and a filter at the charge pump output to reduce an impact of the switching noise of the charge pump on the regulator output, wherein the filter is outside a main servo loop of the regulator, wherein an n-type pass element and/or cascode element in the cascoded n-type output pass device comprises at least one of a Metal Oxide Semiconductor (MOS) Field Effect Transistor (FET), a bipolar junction transistor, an LDMOS, or a FinFET device.

Abstract: Particular embodiments include logic that can reduce an voltage output of a regulator to multiple subsystems in response to detecting high power conditions in an electronic device. When the power being monitored goes up, the logic detects the increase in power. Then, the logic can compare the power to a plurality of thresholds. The plurality of thresholds may be set below an absolute limit threshold in which the electronic device may not operate properly if the absolute limit is met. When a first threshold is met, the output voltage of the regulator may be decreased until a minimum voltage level is reached. When a second threshold is met, the output voltage may be increased until a maximum voltage level is reached. The minimum and maximum voltage levels may be based on voltage levels requested from a set of subsystems and also priority levels associated with those subsystems.

Abstract: A low drop-out voltage regulator includes an error amplifier having a non-inverting input, an inverting input and an output. One of the non-inverting and inverting inputs is connected to a reference voltage. An output circuit is connected by way of the output of the error amplifier to an external load. The output circuit generates an output current and an output voltage for the external load. A current tracking circuit is coupled to the output circuit and receives the output current and generates a tracking current that tracks the output current. A load tracking-compensation circuit is coupled to the current tracking circuit and the output circuit, and generates a control voltage based on the tracking current and provides the control voltage to the output circuit.

Abstract: An inrush current recording module is installed in a power supply unit. The power supply unit has a front-stage power circuit and a back-stage power circuit. The front-stage power circuit includes a first ground terminal, and the back-stage power circuit includes a second ground terminal. The inrush current recording module includes a series circuit and a detection recording unit. The series circuit is formed by a capacitor and a resistor, and includes two ends thereof respectively connected to the first ground terminal and the second ground terminal. The detection recording unit detects the resistor to generate a voltage signal, compares the voltage signal with a voltage determination level, starts timing an inspection period when the voltage signal is greater than the voltage determination level, and records whether a current inrush current is harmful or harmless according to whether a power output signal is obtained within the inspection period.

Abstract: A regulator includes a first operational amplifier configured to receive a reference voltage and a feedback voltage and to output a node voltage based on a difference of the feedback voltage and the reference voltage; a first switch unit configured to receive the node voltage and to supply a recover current based on the node voltage; an output unit configured to output an output voltage and the feedback voltage according to a supply of the recover current; a comparison unit configured to receive the reference voltage and a feedback voltage and to sense a voltage drop of the output voltage; and a second switch unit configured to discharge the first switch unit according to the difference of the reference voltage and the feedback voltage.

Abstract: A method of operating a switched mode power supply comprising a switched mode converter and a control arrangement. The switched mode converter converts an input voltage to an output voltage and includes a primary winding, controllable switch based circuitry connecting the input voltage over the primary winding, a secondary winding coupled to the primary winding, and an LC filter including an inductive element and a capacitive element, wherein the output voltage is obtained as the voltage over the capacitive element and a duty cycle of the switched mode converter can be controlled by controlling the switch based circuitry. The switched mode converter is controlled depending on measurements of the input and output voltages in a hybrid regulated ratio control scheme. The power of the switched mode power supply is shut off or a current thereof is limited, when a current of the switched mode power supply reaches a maximum current.

Abstract: The voltage regulator includes an overheat protection circuit. The overheat protection circuit includes: a temperature sensing circuit; a voltage difference sensing circuit configured to output a current depending on a voltage difference between a power source voltage to be supplied to a power supply terminal and the output voltage; an output current monitoring circuit; a second reference voltage circuit configured to generate a second reference voltage; a comparator circuit configured to compare an output voltage of the temperature sensing circuit and the second reference voltage to each other; and an overheat protection transistor is configured to turn off the output transistor when the result of the comparison indicates an overheated state. The second reference voltage of the second reference voltage circuit is controlled based on an output current of the voltage difference sensing circuit and on an output current of the output current monitoring circuit.

Abstract: Methods, devices, systems, and integrated circuits are disclosed for switching on an electrical connection to one or more loads. In one example, a switch device includes a voltage source, a power switch circuit block connected to the voltage source, and a current limitation circuit block connected to the voltage source and the power switch circuit block. The switch device further includes a voltage outlet connected to the power switch circuit block. The switch device further includes a current limit feedback circuit connected to the power switch circuit block and the current limitation circuit block. The current limit feedback circuit is configured to enable the switch device to provide a regulated connection between the power switch circuit block and the voltage outlet, wherein the regulated connection defines a current limitation mode, such that the regulated connection reduces the current in the power switch circuit block if the switch device is in the current limitation mode.

Abstract: A voltage regulator circuit is provided in which voltage overshoots are quickly dissipated using a discharge path which is connected to an output of the voltage regulator. Circuitry for controlling the discharge path is provided using internal currents of an error amplifier to provide a space-efficient and power-efficient design with a fast response. Moreover, hysteresis can be provided to avoid toggling between discharge and no discharge, and to avoid undershoot when discharging the output. A digital or analog signal is set which turns the discharge transistor on or off. A current pulldown may be arranged in the discharge path.

Abstract: An apparatus comprising a steady state sensing circuit, a switching circuit, and a detection circuit. The steady state sensing circuit is connected to a first, a second and a third node. The first node is connected to a first device, the second node is connected to a second device, and the steady state sensing circuit causes a scaled current to flow at the third node. The scaled current is proportional to a voltage difference between the first and second node. The switching circuit limits an amount of current that flows between the first and second device. The detection circuit is connected to the third node and the switching circuit. The detection circuit monitors the scaled current at the third node and controls the switching circuit to limit the amount of the current that flows between the first and second device when the scaled current is greater than a desired level.

Abstract: Current sensing through a power semiconductor device with reduced sensitivity to temperature and process variations. An example arrangement includes a power switch coupled between a voltage input and an output voltage terminal supplying current to a load; a first isolation switch coupled between the voltage input and a first node; a comparator amplifier having a pair of differential inputs coupled to the first node and a second node outputting a voltage in response to the difference at the differential inputs; and a first current source coupled between a positive supply voltage and the first node to output a first current responsive to the voltage output from the comparator amplifier; wherein the first current is proportional to the current through the power switch and a ratio of the on resistance of the power switch and the on resistance of the first isolation switch. Methods and additional arrangements are also disclosed.

Abstract: A bias circuit supplies a bias voltage VBIAS to a microphone. A variable gain amplifier amplifies a reference voltage VREF. A low-pass filter removes a high-frequency component from the output of the variable gain amplifier. A voltage follower amplifier receives the output voltage of the low-pass filter, and supplies the output voltage to the microphone.

Abstract: A method and a system for generating auxiliary power for an islanded wind turbine are described, wherein the wind turbine may comprise a generator configured to provide power to a main grid. The method comprises: detecting an island mode of operation wherein said wind turbine is electrically disconnected from said main grid; in response to said disconnection, adjusting the rotational speed of said wind turbine to a value within a range of low rotational speeds; converting said generator output to a value suitable for charging said auxiliary power distribution system; and, connecting the output of said converter to said auxiliary power distribution system.

Abstract: In a typical DC-DC converter, an error amplifier is used to sense and amplify the difference between the feedback voltage and the reference voltage. In the event of current overloading (limit condition), example embodiments of the disclosed systems and methods of over-load protection with voltage fold-back fold back the reference voltage proportional to the current limit. The regulator may continue to regulate in this fold-back voltage reference condition without shutting down the converter, saturating the inductor, or causing a catastrophic failure at the power FETs. The disclosed systems and methods of over-load protection with voltage fold-back resolve consecutive switching cycle current build up in high input voltage DC/DC convertor applications due to the latency of current limit circuitry.

Abstract: Provided is a voltage regulator in which an output current can be controlled stably and accurately to an overcurrent protection set value without the need of providing a phase compensation circuit including an element having a large area. The voltage regulator includes a constant voltage control circuit including: a first differential amplifier circuit for comparing a first reference voltage and a feedback voltage to each other; and an output transistor to be controlled by an output voltage of the first differential amplifier circuit, and an overcurrent protective circuit including: a resistor for measuring the output current; a second differential amplifier circuit for measuring a difference between voltages at both terminals of the resistor; a comparator for comparing an output voltage of the second differential amplifier circuit and a second reference voltage to each other; and a switch to be controlled by a detection signal of the comparator.

Abstract: A trans-conductance regulation circuit, a trans-conductance error amplifier module and a power converter. The trans-conductance regulation circuit provides a bias current at least partially based on an output voltage of the power converter. The bias current is sent to bias a trans-conductance operational amplifier in the trans-conductance error amplifier module so that a trans-conductance of the trans-conductance operational amplifier is direct proportional to the output voltage of the power converter. The power converter regulates the output voltage based on a negative feedback loop comprising the trans-conductance error amplifier module. The trans-conductance error amplifier module may help to maintain a band width of the negative feedback loop substantially stable and immune to variations in the output voltage.

Abstract: The reversal of the flow of output current in a voltage regulator is prevented by equipping the voltage regulator of a regulation transistor controlled by an analog voltage control, having its current terminals connected between the control terminal of the fifth transistor power of the regulator and the power supply line or the common ground node of the regulator. The regulation transistor is configured to provide an electrical path of conduction between the control terminal and the power supply line or the ground node and is controlled by an analog voltage control that varies in a continuous manner between a first level, suitable to extinguish the regulation transistor, and a second level suitable for biasing it in an operating condition of deep conduction, as the difference between the supply voltage and the regulated output voltage approaching an offset voltage.

Abstract: The present document relates to a current sensing and/or control circuit with reduced sensing errors. A current control circuit for controlling a load current into an electronic device is described. The current control circuit comprises an array of control transistors configured to adjust the load current provided at an output of the array of control transistors. The load current is drawn from a power supply at an input voltage. Furthermore, the power supply is coupled to an input of the array of control transistors. The circuit further comprises a reference transistor coupled to the power supply at an input of the reference transistor and a reference current source configured to draw a reference current at an output of the reference transistor.

Abstract: An over-current protection device is provided. A first end of a first resistor is coupled to a voltage input terminal and a second end of the first resistor is coupled to a control terminal of an electronic switch. A detecting pin of a control chip is coupled to the second end of the first resistor and an input pin of the control chip is coupled to the first end of the first resistor. A control pin of the control chip is coupled to a control terminal of the electronic switch. The voltage output terminal is coupled to a first terminal of the electronic switch. The control chip compares a preset current value saved therein with a detecting current passing through the first resistor. If the detecting current is greater than the preset current value, there is no voltage output from the voltage output terminal.

Abstract: A voltage regulator includes a reference current scaling circuit comprising an input reference current, a scaled output source current and a corresponding first bias voltage, and a scaled output sink current and a corresponding second bias voltage; and a decision making circuit having a first voltage input for receiving a first reference voltage, a second voltage input for receiving a second reference voltage, a third voltage input for receiving the first bias voltage, and a fourth voltage input for receiving the second bias voltage, and an output for providing a regulated voltage.

Abstract: A power control module including first port for receiving supply voltage from host power supply, second port for providing output voltage to power one or more data storage device components, isolation circuit coupled to first and second ports, driver including output coupled to control terminal of isolation circuit, voltage booster including input for receiving supply voltage and output for providing boost voltage to supply terminal of driver, voltage limiter operable to limit boost voltage to a limited boost voltage, and control circuitry coupled to drive input and operable to cause the isolation circuit to be in closed state during normal operating mode by causing the driver to apply limited boost voltage to the control terminal of the isolation circuit, thereby enabling the isolation circuit to provide over-voltage protection to one or more data storage device components by limiting output voltage at second port to less than the limited boost voltage.

Abstract: A power supply that includes positive and negative floating power supply rails. Laterally diffused metal oxide semiconductors (LDMOS) regulate the output voltage of the positive and negative floating power supply rails. In particular, an LDMOS can be configured as a common gate amplifier at the output of the power supply to sense the output of the positive and negative floating power supply rails.

Abstract: A low dropout (LDO) regulator with a limited startup inrush current is disclosed. The LDO includes a power source, error amplifier, pass transistor, feedback network, and a current limit control whose input is electrically connected to the pass transistor and the electrical output of the error amplifier and whose output limits current during startup. The LDO can include a current control limit comparator including a power source, and output of the pass transistor. The LDO can also include a bypass mode current control limit comparator having a first input voltage of the error amplifier, and a second input voltage from the error amplifier.

Abstract: To provide a voltage regulator capable of preventing a reduction in output voltage and an increase in output noise in a steady state without performing suppression of an overshoot. A voltage regulator is equipped with an overshoot detection circuit which detects an overshoot on the basis of an output voltage, an overshoot suppression circuit which controls an output terminal of an error amplifier circuit, based on the output of the overshoot detection circuit, and a driver state discrimination circuit which discriminates the state of an output transistor, based on an output voltage of the error amplifier circuit. The driver state discrimination circuit is configured to control the operation of the overshoot suppression circuit.

Abstract: Provided is a switching regulator configured to achieve a 100% Duty state and reduce an occurrence of an overshoot. The switching regulator has a configuration in which a clamp circuit configured to dynamically generate a clamp level clamps an output voltage of an error amplifier in accordance with a peak value of a triangular wave signal.

Abstract: Systems and methods of measuring current in a power over Ethernet (PoE) system are provided. The PoE system includes an integrated circuit component having a controller, an internal transistor, a replica transistor, and an external transistor. Current in the system can be indirectly measured by enabling and disabling the transistors in known ways and then measuring the current through the replica transistor. The actual current in the system can be calculated based on the measured currents, thereby allowing for a PoE system that is capable of measuring current without a resistor in series with the external transistor.

Abstract: A protection circuit and a gate driving circuitry. The protection circuit is for protecting a p-type back-to-back MOS switch. The circuit receives an input driving signal and provides a driving output signal to common gates of the p-type back-to-back MOS switch. The circuit comprises a driving signal insulation switch for disconnecting the common gate of the p-type back-to-back MOS switch from the received input driving signal when the voltage of the common gates is larger than the supply voltage of the circuit. The circuit further comprises a gate source coupling switch for coupling a voltage received at the common source of the p-type back-to-back MOS switch to the common gate if a received voltage at the common sources is larger than a reference voltage Vref.

Abstract: In one example, a method includes operating an LDO regulator system in one of a voltage regulation mode or a power balancing mode. The method further includes comparing one or more respective reference voltages to one or more respective feedback voltages to determine a change in amount of current that needs to be delivered by the LDO regulator system, wherein a first reference voltage is across a reference resistor and a first feedback voltage is across a shunt resistor, and in response to the change in the amount of current that needs to be delivered by the LDO regulator system, adjusting an amount of current flowing through a transistor to maintain a load at a constant output voltage level. Circuits and systems that implement the method are also described.

Abstract: In accordance with an embodiment, a circuit includes a first normally-on transistor having a drain coupled to a first switching output node, a normally-off transistor having a drain coupled to a source of the first normally-on transistor, a driver circuit configured to receive a switching signal, the driver circuit having an output coupled to a gate of the first normally-on transistor, and a second normally-on transistor having a drain terminal coupled to a supply node, a gate terminal coupled to the output of the driver circuit, and a source terminal configured to provide an auxiliary voltage.

Abstract: A fault protection and correction circuit for the control of a power converter is disclosed. An example circuit generates a waveform that drives a switch on or off and controls the power converter. The controller circuit in addition to power factor correction (PFC) circuitry includes a first and a second shut down mode modules, both of them cause the switching to stop. The circuit includes a module for receiving fault events. When a fault occurs, the controller enters the second shut down mode. The controller stays in the second shut down mode if the required current for this mode can be provided by the outside circuitry. Otherwise, the controller enters the first shut down mode that requires less current and subsequently restarts the controller. By modifying the outside circuitry the controller can respond differently to fault events.

Abstract: A voltage regulator permits reduced current consumption by promptly and timely stopping the operation of an inrush current protection circuit immediately after the voltage regulator is started up. The voltage regulator has an output voltage detection circuit, which issues a detection signal to actuate the inrush current protection circuit when a low voltage at an output terminal is detected at the time of starting up the voltage regulator. When it is detected that the voltage at the output terminal has reached a predetermined level, the operation of the inrush current protection circuit is stopped and a power path of the output voltage detection circuit is cut off.

Abstract: The step-down regulator includes a first error amplifying circuit that receives a first reference voltage and the first voltage and supplies a first control signal to a control terminal of the first transistor so that the first reference voltage and the first voltage are equal to each other. The step-down regulator includes a second error amplifying circuit that receives a voltage at the second end of the current controlling circuit and a second reference voltage and supplies a second control signal to the current controlling circuit so that the voltage at the second end of the current controlling circuit and the second reference voltage are equal to each other. The step-down regulator includes a diode that is connected to the second end of the current controlling circuit at an anode thereof and to the second potential at a cathode thereof.

Abstract: Apparatuses and methods are provided where a predefined voltage may be applied in a feedback circuit of a voltage regulator, the feedback circuit coupling and output terminal with an adjust terminal of the voltage regulator.

Abstract: The disclosed invention provides apparatus and methods for dynamic biasing in electronic systems and circuits. The apparatus and methods disclosed provide non-linear biasing responsive to monitored load conditions.

Abstract: A power supply module and a power supply method corresponding to an electronic device. The power supply module includes a low-dropout (LDO) voltage regulator to adjust an input signal received from a battery and output a stabilized output signal, and an external load calculation circuit to calculate an external load value at a power output node of the LDO voltage regulator and stabilize the output signal based on the external load value.

Abstract: A voltage regulator includes an amplifier having a first input coupled to a first reference voltage and a second input coupled to a voltage feedback signal; a multiplexer having a first input coupled to an output of the amplifier, a second input coupled to a voltage clamp signal, and a control input; and a control circuit having a first input coupled to an over current indicator, a second input coupled to a no over voltage indicator, a third input coupled to a timer signal, and an output coupled to the control input of the multiplexer.

Abstract: A voltage regulator compensation circuit provides power to a dynamic load and includes a power transistor configured to drive the dynamic load, a reference determining transistor configured to establish a voltage reference proportional to a regulated output voltage of the power transistor, and a control circuit coupled to a gate input of both the power transistor and the reference determining transistor. Also included is a comparison engine configured to compare the regulated output voltage and the voltage reference, and a current consuming transistor operatively coupled to an output of the power transistor and configured to provide a varying secondary load. The comparison engine is configured to control the current consuming transistor to increase current draw or decrease current draw from the power transistor based on the difference between the regulated output voltage and the voltage reference.

Abstract: A pass device configured from a common gate transistor, wherein an input voltage is applied to the source and an output at the drain is applied to a load. The input resistance of the pass device increases as the input voltage is reduced and limits the useful range of the input voltage. Increasing the gate to source voltage (Vgs) by applying a negative voltage to the gate reduces the input resistance and increases the range of operation of the pass device.

Abstract: A constant voltage circuit includes an output control transistor to control an output current from an output terminal to keep an output voltage constant at a set voltage; and an excess-current protection circuit to control the output control transistor. The excess-current protection circuit includes a current increase restriction element to restrict increase in the output current to decrease the output voltage; a first current limitation circuit to limit a gate voltage of the output control transistor to decrease the output current, when the output voltage is decreased to a first limited voltage; a second current limitation circuit to limit a gate voltage of the output control transistor to decrease the output current, when the output voltage is decreased to a second limited voltage smaller than the first limited voltage; and a selector to select whether the first current limitation circuit is operated or stopped.

Abstract: A distributed system for driving strings of series-connected LEDs for backlighting, display and lighting applications includes multiple intelligent satellite LED driver ICs connected to a an interface IC via serial bus. The interface IC translates information obtained from a host microcontroller into instructions for the satellite LED driver ICs pertaining to such parameters as duty factor, current levels, phase delay and fault settings. Fault conditions in the LED driver ICs can be transmitted back to, the interface IC. An analog current sense feedback system which also links the LED driver ICs determines the supply voltage for the LED strings.

Abstract: A switching regulator including: a power stage having a first power switch and a second power switch coupled in series; a filter circuit having an inductor and an output capacitor; a feedback circuit configured to provide a feedback signal indicating an output voltage of the regulator; and a control circuit configured to provide a switching signal to control the ON and OFF of the first power switch so as to regulate the energy supplied to a load; wherein the control circuit has a peak current generator configured to generate a peak current signal, wherein the gain of a variation of the peak current signal between the contiguous switching cycles is less than one.

Abstract: A distributed system for driving strings of series-connected LEDs for backlighting, display and lighting applications includes multiple intelligent satellite LED driver ICs connected to a an interface IC via serial bus. The interface IC translates information obtained from a host microcontroller into instructions for the satellite LED driver ICs pertaining to such parameters as duty factor, current levels, phase delay and fault settings. Fault conditions in the LED driver ICs can be transmitted back to the interface IC. An analog current sense feedback system which also links the LED driver ICs determines the supply voltage for the LED strings.

Abstract: A first added signal that is acquired by adding a reference current signal that is in proportion to a current flowing through an inductance element, a slope compensation signal and a voltage difference signal that is in proportion to a difference between an input voltage and an output voltage and a second added signal that is acquired by adding the reference current signal and the slope compensation signal are compared with a difference signal of a voltage that is in proportion to the output voltage and a predetermined reference voltage, and pulse widths of driving pulse signals of a step-down switching circuit and a step-up switching circuit are controlled as a result of the comparison.

Abstract: The present invention relates to a voltage converter, which uses an inductor coupled between a power supply and a reference voltage for providing a supply voltage. A plurality of output capacitors are coupled to both sides of the inductor, respectively, and receive the supply voltage for producing a positive voltage and a negative voltage. A plurality of output switches are coupled to both sides of the inductor, respectively, and control the inductor to charge the plurality of output capacitors. A feedback control circuit produces a control signal according to the positive and negative voltages for controlling the plurality of output switches. Thereby, the present invention can produce positive and negative voltage by means of the inductor. Accordingly, the voltage converter according to the present invention avoids usage of multiple inductors and capacitors in producing voltages with different levels, and thus reducing the circuit area as well as the manufacturing cost.

Abstract: A current limiting circuit includes a current sensing module that is configured to sense an output current of a power transistor and to generate a corresponding sensing current which is proportional to the output current. A first current limiting module coupled to the current sensing module is configured to generate a first limiting current based on the sensing current when a variation of the output current of the power transistor exceeds a first current level. A second current limiting module coupled to the current sensing module is configured to generate a second limiting current based on the sensing current when a variation of the output current of the power transistor exceeds a second current level. A converting module coupled to the first and second current limiting modules and the power transistor controls a gate voltage of the power transistor based at least on the first and second limiting currents.

Abstract: A protection circuit of a DC-DC converter is disclosed. An input terminal of the DC-DC converter receives an input voltage and an output terminal of the DC-DC converter provides an output voltage. The DC-DC converter includes an output stage between the input terminal and the output terminal. The protection circuit includes a current sensor, a comparator, a determining circuit, and a protection control circuit. The current sensor provides a sensing signal. The comparator compares a default over-voltage with the sensing signal to provide an over-current control signal. The determining circuit provides a determining control signal. The protection control circuit determines whether to enable a short protection according to the over-current control signal and the determining control signal.