Abstract: A bootstrap circuit integrated to a voltage converter integrated circuit (IC) and a voltage converter IC for a switch mode voltage regulator. The bootstrap circuit is used to provide a bootstrap voltage signal for driving a high side switch of the voltage converter IC. The bootstrap circuit has a pre-charger and a bootstrap capacitor. The pre-charger provides a first bootstrap signal to pre-charge a control terminal of the high side switch, and the bootstrap capacitor provides a second bootstrap signal to enhance the charge of the control terminal of the high side switch.

Abstract: A switching regulator with constant on time control adopts a timer to time when the system is in discontinuous current mode (DCM). If the DCM lasted for a set time, a power stage in the switching regulator is controlled to be ON for a minimum on time duration, so as to ensure the switching regulator enters sleep mode.

Abstract: A primary side regulated isolation voltage converter. The primary side regulated isolation voltage converter comprises a control module and a ripple control circuit. The control module receives the voltage feedback signal and determines whether the isolation voltage converter operates in a light load state. When the isolation voltage converter operates in a light load state, the ripple control circuit senses the ripple of an output voltage signal to generate a ripple signal, and compare the ripple signal with a ripple threshold. When the ripple signal is larger than the ripple threshold, the isolation voltage converter jumps out the light load state.

Abstract: A control circuit for switching converter has an ON signal generating circuit, an OFF signal generating circuit, a first comparator, a second comparator and a logic circuit. The switching converter has a high switch and a low side switch connected in series. The ON signal generating circuit provides an ON signal based on a reference signal and a feedback signal. The OFF signal generating circuit provides an OFF signal. The first comparator provides a first comparing signal based on a comparing result between a first threshold and a current through the high side switch. The second comparator provides a second comparing signal based on a comparing result between a second threshold and a current through the low side switch. The logic circuit provides a first switching signal to control the high side switch ON and OFF and a second switching signal to control the low side switch ON and OFF.

Abstract: A power converter including a load transient response control module and associated method for controller the power converter. The load transient response control module detects a deviation of an output voltage of the power converter from a desired value of the output voltage and compares the deviation with a first threshold to provide a load response control signal indicating whether load transient change occurs. If the deviation is lower than the first threshold, a clock signal of the power converter is reset and a main switch of the power converter is maintained on during the period when the deviation is lower than the first threshold.

Abstract: A control method used in a four-switch buck-boost converter includes: sensing the output voltage and generating a feedback signal; generating a compensation signal based on a reference signal and the feedback signal; sensing the current flowing through the inductor and generating a current sensing signal; comparing the current sensing signal with the compensation signal; turning on the first and third transistors and turning off the second and fourth transistors when the current sensing signal reduces to be lower than the compensation signal; turning off the first transistor and turning on the second transistor when the on-time of the first transistor in one switching period reaches a first time threshold; and turning off the third transistor and turning on the fourth transistor when the on-time of the third transistor reaches a second time threshold.

Abstract: The present invention discloses a dual-phase DC-DC converter with phase lock. The dual-phase DC-DC converter effectively controls the phase difference between the two power switching circuits by generating a square wave signal in response to logical control signals which are used to control the power switching circuits, so as to bring the phase difference between the two power switching circuits back to 180 degrees if there is derivation.

Abstract: A reference compensating circuit used in a COT control circuit. The reference compensating circuit has an error amplifier, a first current sink, a resistor, a second current sink, a current source and a capacitor. The error amplifier amplifies the difference between a reference signal and a feedback signal and generates an error signal. Based on the error signal, the first current sink generates a current flowing out from a node of the reference compensating circuit. The resistor receives the reference signal at one terminal. The other terminal of the resistor is coupled to the node. The second current sink sinks a current from the node intermittently. The current source sources a current into the node. The capacitor is coupled between the node and a ground to provide a calibrated compensation reference signal to the COT control circuit.

Abstract: A boost converter having an inductor having a first terminal coupled to an input port to receive the input voltage; a high side switch coupled between the inductor and an output port; a low side switch coupled between the inductor and a ground reference; and a control circuit configured to receive a feedback signal indicative of the output voltage and a reference signal, and to provide a high side control signal and a low side control signal based on the feedback signal and the reference signal; wherein the low side switch on time period is controlled to be constant by the low side control signal.

Abstract: A boost converter having an inductor having a first terminal coupled to an input port to receive the input voltage; a high side switch coupled between the inductor and an output port; a low side switch coupled between the inductor and a ground reference; and a control circuit configured to receive a feedback signal indicative of the output voltage and a reference signal, and to provide a high side control signal and a low side control signal based on the feedback signal and the reference signal; wherein the low side switch on time period is controlled to be constant by the low side control signal when the input voltage and the output voltage are fixed.

Abstract: A power converter having a clock module and a method for controlling a clock signal of the power converter. The clock module is configured to provide the clock signal and to set a clock frequency of the clock signal to a first predetermined frequency at the moment when the power converter is powered on. The clock module is further configured to regulate the clock frequency to increase from the first predetermined frequency to a second predetermined frequency through a predetermined times of step type frequency increase during a startup procedure of the power converter.

Abstract: A multi-mode power converter and associated method for configuring and controlling a multi-mode power converter. The multi-mode power converter may have a boost operation mode and a buck operation mode. A first transistor is coupled between a switching terminal and a ground, and a second transistor and a third transistor are coupled in series between the switching terminal and an output port of the multi-mode power converter. In the buck mode, an on-resistance of the second transistor is regulated to ensure the multi-mode power converter to operate normally in the buck operation mode.

Abstract: A switching converter providing an output voltage has a first switch and a control circuit. The control circuit provides an auxiliary power supply voltage, and a switching control signal to control the first switch based on the output voltage and a reference signal. The switching converter is shut down by the control circuit when a fault happens, and the switching converter restarts when the auxiliary power supply voltage decreases to a first threshold.

Abstract: A power converter with bootstrap circuit, the power converter has a high side switch, a low side switch, a bootstrap circuit and a bootstrap capacitor for providing a bootstrap voltage to supply a high side driver of the high side switch. The power converter receives an input voltage and provides an output voltage based on driving the high side switch and the low side switch to switch on and off. The bootstrap circuit has a first comparing circuit, a first comparing circuit, a boost circuit and a second charging circuit. The second charging circuit charges the bootstrap capacitor when a voltage difference between the input voltage and the output voltage is smaller than a voltage threshold.

Abstract: A peak sample circuit for AC voltage, including: a rectifier coupled to receive an AC voltage and to rectify the AC voltage to generate a rectified signal; a delay circuit coupled to receive the rectified signal and to delay the rectified signal to generate a delayed rectified signal; a comparison circuit coupled to receive the delayed rectified signal and to generate a square signal based on the comparison of the rectified signal and the delayed rectified signal; and a sample output circuit coupled to receive the rectified signal, wherein the sample output circuit samples the rectified signal under the control of the square signal and provides a peak sample signal representative of the peak value of the AC voltage.

Abstract: A power converter having a soft-off control circuit and a variable reference signal generation module and associated method for controlling the power converter. The variable reference signal generation module is configured to provide a variable reference signal to the power converter. The soft-off control circuit is configured to determine whether an input voltage of the power converter exceeds an over-voltage threshold, and to control the variable reference signal to increase once the input voltage reaches the over-voltage threshold and to decrease when the input voltage is lower than the over-voltage threshold. The power converter can regulate an output voltage to increase with the increase of the variable reference signal and to decrease with the decrease of the variable reference signal so that during a soft-off procedure the input voltage may not exceed the over-voltage threshold, enabling the power converter to be safely shut off.

Abstract: A primary side regulated isolation voltage converter. The primary side regulated isolation voltage converter comprises a control module and a ripple control circuit. The control module receives the voltage feedback signal and determines whether the isolation voltage converter operates in a light load state. When the isolation voltage converter operates in a light load state, the ripple control circuit senses the ripple of an output voltage signal to generate a ripple signal, and compare the ripple signal with a ripple threshold. When the ripple signal is larger than the ripple threshold, the isolation voltage converter jumps out the light load state.

Abstract: A switching converter and a load regulation compensation module for improving load regulation accuracy of the switching converter. The switching converter regulates its output voltage through controlling a switch module to switch on and off based on a first reference signal and a feedback signal indicative of the output voltage. The on and off switching of the switch module generates a switching current, resulting in an average offset voltage between an internal reference ground and a package ground pin of the switching converter. The load regulation compensation module is configured to monitor the switching current, and to compensate a second reference signal having a bandgap reference voltage referenced to the internal reference ground based on the monitored switching current to generate the first reference signal, so that the average offset voltage is substantially cancelled out from the first reference signal with respect to the package ground pin.

Abstract: A control circuit for a switching power converter is disclosed. The control circuit may comprise an OFF control signal generation module configured to generate an OFF control signal having an inactive logic state and an active logic state. The control circuit is configured to turn OFF a main switch of the switching power converter in response to the active logic state. The OFF control signal generation module can regulate an ON time of the main switch through regulating a change of the OFF control signal from the inactive logic state to the active logic state based on a first capacitor voltage across a first capacitor to maintain a switching frequency of the main switch substantially constant. The first capacitor is charged in a predetermined time since the main switch is turned ON and discharged after the predetermined time.

Abstract: A power converter having a current limit module and a method for controlling the power converter. The power converter converts an input voltage to an output voltage based at least on driving a main switch to switch on and off and regulates the output voltage through regulating a duty cycle of the main switch. The current limit module is configured to compensate a first current limit threshold indicative of a maximum allowable value of a peak value of a switching current of the main switch with a threshold compensation signal indicative of the duty cycle to provide a second current limit threshold. The second current limit threshold is used to limit the maximum value of the peak value, so that a maximum allowable output power of the power converter is substantially uninfluenced by the variation in the duty cycle.