Abstract: A power supply system has a current source configured to provide an output current, a load supplied by the current source, and a current ripple suppression circuit. The current ripple suppression circuit has a first end and a second end, wherein the first end of the current ripple suppression circuit is coupled to the load, and the second end of the current ripple suppression circuit is coupled to a reference ground; wherein the current ripple suppression circuit is configured to suppress the current ripple in the output current and adaptively adjust the output current of the current source at a predetermined current level.

Abstract: A voltage detecting circuit used with a switching converter. The switching converter having an energy storage component, a first power switch and a second switch. The voltage detecting circuit has a sample and hold circuit configured to sample and hold the voltage at the connection node of the energy storage component and the first power switch when the first power switch is OFF and the second power switch is ON; and an average circuit configured to average the sampled voltage during a switching period to generate a detecting signal in proportional to the output voltage of the switching converter.

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 converter control circuit for converting an input voltage to an output voltage comprises: an error amplifier, coupled to an output voltage or a feedback output signal from the output voltage, and a reference signal, operable to generate an error signal accordingly; a ramp signal generator, generating a first ramp signal and a second ramp signal; a first comparator, coupled to the error signal and the first ramp signal, operable to generate a first comparing signal accordingly; a second comparator, coupled to the error signal and the second ramp signal, operable to generate a second comparing signal accordingly; and a control signal generator, coupled to the first comparing signal and the second comparing signal, operable to generate a control signal to turn switches in the converter circuit ON and OFF accordingly.

Abstract: A semiconductor device having an ESD protection structure and a method for forming the semiconductor device. The ESD protection structure is formed atop a termination area of the substrate and is electrically coupled between a source metal and a gate metal of the semiconductor device. The ESD protection structure has a first portion adjacent to the source metal, a second portion adjacent to the gate metal and a middle portion between and connecting the first portion and the second portion, wherein the middle portion has a first thickness greater than a second thickness of the first portion and the second portion. Such an ESD protection structure is beneficial to the formation of interlayer vias which are formed to couple the ESD protection structure to the source metal and the gate metal.

Abstract: A timing circuit used in lighting systems includes a first logic circuit, a first counter, a latching circuit and a judging circuit. The first logic circuit generates a first logic signal and a second logic signal based on a falling edge of a detecting signal. The first counter generates a first counting signal and a second counting signal based on the second logic signal, wherein the counting period of the first counting signal is longer than that of the second counting signal. The latching circuit samples and holds the first counting signal based on the first logic signal and provides a third counting signal. The judging circuit detects whether the second counting signal is equal to the third counting signal and provides a timing signal.

Abstract: An isolated switching converter includes a transformer having a primary winding, a secondary winding and an auxiliary winding, a primary switch coupled to the primary winding, a secondary switch coupled to the secondary winding, and a feedback circuit coupled to the auxiliary winding to generate a feedback signal indicative of the output voltage. Under normal operation, the primary switch is controlled based on the feedback signal and the secondary switch is controlled based on the status of the primary switch. Under light load condition, the secondary switch is controlled based on the output voltage. The secondary switch is turned on to generate a negative secondary current flowing through the secondary winding and turned off when the negative secondary current reaches a secondary current threshold. The primary switch is turned on based on a negative primary current and turned off when the primary current reaches a primary current threshold.

Abstract: A multi-phase SMPS has N switching circuits; a setting signal generator generating a setting signal based on an output signal of the SMPS; a clock signal generator generating a system clock signal; and a controller receiving the setting signal and the system clock signal, the controller generating N shifted phase clock signals according to the system clock signal, and the N shifted phase clock signals forming loop phase clocks, and the controller further generates N switching control signals based on the setting signal and the N shifted phase clock signals.

Abstract: A light driver and the controller and the driving method thereof are disclosed. The controller has a reference generating circuit which has a dimming signal converting circuit, a thermal signal converting circuit and a selecting circuit. The dimming signal converting circuit converts a dimming signal into a converted dimming signal and the thermal signal converting circuit converts the thermal signal into a converted thermal signal. The selecting circuit selects the smaller one of the converted dimming signal and the converted thermal signal and outputs a reference signal based on the selected smaller signal.

Abstract: A controller of an isolated switching converter includes an error amplifying circuit, a modulation signal generator, a first comparison circuit, a primary off detection circuit, a secondary logic circuit, an isolation circuit and a primary logic circuit. The error amplifying circuit generates a compensation signal based on the difference between a reference signal and a feedback signal. The first comparison circuit compares the compensation signal with a modulation signal generated by the modulation signal generator and generates a first comparison signal. The primary off detection circuit detects whether the primary switch is off and generates a primary off detection signal. The secondary logic circuit generates a secondary control signal to control the secondary switch based on the first comparison signal and the primary off detection signal. The isolation circuit receives the first comparison signal and generates a synchronous signal electrically isolated from the first comparison signal.

Abstract: A switching mode power supply, having: a power switch; an energy storage component coupled to the power switch; a current sense resistor configured to generate a current sense signal; a mode select resistor configured to generate a mode select resistor; a ZCD (Zero Cross Detecting) circuit configured to generate a ZCD signal; and a control circuit configured to provide a switch control signal to control the on and off of the power switch, the control circuit having a multi-function pin configured to receive the mode select signal, the current sense signal and the ZCD signal.

Abstract: A high voltage analog switch can be used in medical ultrasound applications. The high voltage analog switch can pass high voltage transducer excitation signals without necessarily having any high voltage power supplies. The high voltage analog switch can include three output switches, with one of the output switches having a clamp circuit for ensuring that transistors of an output switch on an input end of the high voltage analog switch remain OFF when the high voltage analog switch is OFF.

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.

Abstract: A switching mode power supply (SMPS) includes a transformer having a primary winding, a secondary winding for providing an output voltage and an auxiliary winding, a primary switch coupled to the primary winding, a secondary rectifying diode coupled to the secondary winding and a secondary switch connected in parallel with the secondary rectifying diode. A control method used in the SMPS includes: comparing a voltage across the secondary switch with a first secondary threshold and a second secondary threshold and generating a hysteresis comparison signal; timing based on the hysteresis comparison signal; comparing the voltage across the secondary switch with a third secondary threshold when the timing period reaches a first predetermined time; turning ON the secondary switch when the voltage across the secondary switch is less than a third secondary threshold; and turning on the primary switch when the conduction of the secondary switch is detected.

Abstract: The present invention discloses a LED driver including a power stage, an inductor, an error amplifier, a set comparator, a first timer, a logical AND circuit, a reset comparator, a second timer a logical OR circuit, a RS flip flop and a driving circuit. The LED driver provides sufficient latching current for the TRIAC dimmer with no large RC circuit, so as to optimize the dimming and reduce system size.

Abstract: A switching charger having a control circuit configured to provide a control signal; a power stage turned ON and OFF by the control signal; an inductor coupled between the power stage and a load; and an output capacitor coupled in parallel with the load; wherein the control circuit limits a current flowing through the inductor in a hysteretic window, and wherein the hysteretic window is adjusted according to an ON time of the control signal.

Abstract: A SMPS has a switch, an inductor, a zero current detection circuit for detecting the current flowing through the inductor, a load judgment circuit and a control signal generating circuit. The load judgment circuit is coupled to the zero current detection circuit and provides a plurality of status signals based on a zero current duration of the inductor current. The control signal generating circuit generates a control signal which transits from a first state to a second state when a feedback signal satisfies a preset condition, and the control signal transits from the second state to the first state after an on time of the switch, and wherein the on time is controlled based on the plurality of status signals.

Abstract: A control circuit for a synchronous rectification circuit, a LLC resonant converter and a control method. The control circuit has a first comparing circuit, a second comparing circuit, a blanking circuit, a first logic circuit and a second logic circuit. The blanking circuit is configured to provide a first blanking signal and a second blanking signal to avoid one or more repeated conduction of a first synchronous rectifier and a second synchronous rectifier respectively, and the first blanking signal and the second blanking signal are logic complementary.

Abstract: A monolithic integrated circuit (IC) switch device includes an input pin that receives an input power supply and an output pin that is connected to a load. The monolithic IC switch device includes driving circuitry that controls a switching operation of a power switch to connect and disconnect the input power supply to and from the load. A microcontroller can enable or disable the monolithic IC switch device based on indicator signals received by the microcontroller from the monolithic IC switch device.

Abstract: A constant on-time control switching converter with DC calibration is disclosed. A current flowing into a capacitor of a DC calibration circuit is reduced by introducing a transconductance amplifier and a resistor. Thus, the equivalent capacitance of the capacitor is magnified, which allows the user to integrate a capacitor with smaller capacitance to realize DC calibration.