Abstract: A switch mode power supply having an output terminal configured to provide an output voltage, the switch mode power supply has a first switch and a control circuit, wherein the control circuit is configured to receive a current sense signal via a reuse input pin when the first switch is turned ON, and the control circuit is configured to receive a voltage sense signal via a reuse input pin when the first switch is turned OFF.

Abstract: A field effect transistor (“FET”), a termination structure and associated method for manufacturing. The FET has a plurality of active transistor cells and a termination structure. The termination structure for the FET includes a plurality of termination cells arranged substantially in parallel from an inner side toward an outer side of a termination area of the FET. Each of the termination cells comprises a termination trench lined with a termination insulation layer and filled with a termination conduction layer. The innermost termination cell is electrically coupled to gate regions of the active transistor cells while the rest of the termination cells are electrically floating.

Abstract: A switch-mode power supply includes a converter, a controller and a charging current. The charging current includes a logic circuit, a first current source and a second current source, to generate a charging current proportional to an input voltage of the switch-mode power supply, and also to generate a logic control signal indicative of either of two operation modes.

Abstract: A switching converter providing an output voltage has at least one switch and a control circuit. The control circuit has a slope compensation module, an output correction module and a control module, wherein the slope compensation module provides a slope compensation signal, the output correction module provides a voltage trim signal based on the slope compensation signal, and the control module provides a control signal to control the at least one switch based on the slope compensation signal, the voltage trim signal, a reference signal, the output voltage and an error compensation signal provided based on a difference between the output voltage and a set target of the output voltage.

Abstract: A power loss control method comprises detecting a load condition of the MOS unit, and adjusting driving loss of the MOS unit based on the load condition. The driving loss of the MOS unit is configured to decrease when the MOS unit is at light load condition.

Abstract: A LED driver system includes a LED converter converting an input voltage to an output voltage to drive a LED load via a main switch; a sensing circuit generating a feedback signal on the output terminal according to a load current through the LED load; an over-shoot detecting circuit generating an over-shoot signal according to the load current and a second reference signal; a logic circuit generating a switching signal according to a control signal and the over-shoot signal to control the main switch. The control signal is generated according to the feedback signal and a first reference signal, and the second reference signal is larger than the first reference 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 charger system with a digital interface circuit, wherein the digital interface circuit has an N-bit control register, wherein N is a positive integer no less than 2, and wherein the N-bit register has a primary state machine, at a first portion of addresses of the control register, configured to instruct operation statuses of a system management bus host; and a secondary state machine, at a second portion of addresses of the control register, configured to instruct a data bit of transmission of a corresponding control instruction under each of the operation statuses of the system management bus host.

Abstract: A switch mode power supply having an output terminal configured to provide an output voltage, the switch mode power supply has a first switch and a control circuit. The control circuit is configured to provide a switching control signal to control the first switch. The control circuit is configured to provide the switching control signal based on a first pulse signal having a first frequency and a second frequency for a light load condition, and the control circuit is configured to provide the switching control signal based on a second pulse signal for a non-light load condition.

Abstract: The present invention provides a power supply comprising a driver and a charge pump. The driver is configured to provide a driving signal to a load. The charge pump comprises a first capacitor coupled to the load in parallel, at least one flying capacitor, a second capacitor and a switch array comprising a plurality of switches. The switch array is coupled to the first capacitor, the second capacitor and the at least one flying capacitor. The switch array receives the voltage across the first capacitor and controls the charge and discharge of the at least one flying capacitor, so as to make the voltage across the second capacitor be larger than the voltage across the first capacitor.

Abstract: A single inductor multiple output buck converter includes an inductor having a first terminal and a second terminal, a first switch coupled between an input voltage and the first terminal of the inductor, a second switch coupled between the first terminal of the inductor and a reference ground, a third switch coupled between the second terminal of the inductor and a first output voltage, and a fourth switch coupled between the second terminal of the inductor and a second output voltage. A first feedback signal indicative of the first output voltage is compared with a first reference signal to generate a first comparison signal. A second feedback signal indicative of the second output voltage is compared with a second reference signal to generate a second comparison signal. Then which one of the first comparison signal and the second comparison signal is asserted first is detected, and the first to fourth switches are controlled based on the detection result.

Abstract: A power converter having a bootstrap refresh control circuit and a method for controlling the power converter. The bootstrap refresh control circuit is configured to monitor a bootstrap voltage across a bootstrap capacitor and to provide an enhanced high side driving signal to a high side switch of the power converter. The bootstrap refresh control circuit is further configured to controlling the charging of the bootstrap capacitor through regulating the on and off switching of the high side switch and a low side switch based on the bootstrap voltage. The bootstrap refresh control circuit can refresh the bootstrap voltage in time to support driving the high side switch normally, without causing large spikes in an output voltage of the power converter and without influencing the power conversion efficiency of the power converter.

Abstract: A switch mode power supply having an output terminal configured to provide an output voltage which is regulated to an output target, the switch mode power supply has a first switch and a control circuit. When the output voltage increases to a first threshold voltage, the control circuit is configured to turn OFF the first switch until a time period expires.

Abstract: An LED driving apparatus includes a rectifier bridge generating a DC bus voltage, a bus capacitor coupled between the output terminal of the rectifier bridge and a reference ground, a voltage sensing circuit generating a voltage sensing signal indicative of the DC bus voltage, a bleeding circuit providing a bleeding current for the bus capacitor, a switching converter configured to convert the DC bus voltage into a driving signal to drive an LED, a dimming mode detector detecting whether the LED driving apparatus is coupled to a leading edge dimmer or a trailing edge dimmer based on the voltage sensing signal, and a bleeding control circuit generating a control signal to control the bleeding circuit based on the voltage sensing signal, the leading edge dimming mode signal and the trailing edge dimming mode signal.

Abstract: A dimming mode detection method is used in an LED driving apparatus including a rectifier bridge providing a DC bus voltage and a switching converter configured to convert the DC bus voltage into a driving signal to drive an LED. The method involves: powering on the LED driving apparatus; sensing the DC bus voltage and generating a voltage sensing signal; comparing a rising time during which the voltage sensing signal increases from a second threshold voltage to a first threshold voltage with a first time threshold to detect whether the LED driving apparatus is connected to a leading edge dimmer; and comparing a falling time during which the voltage sensing signal decreases from a third threshold voltage to a fourth threshold voltage with a second time threshold to detect whether the LED driving apparatus is connected to a trailing edge dimmer.

Abstract: A semiconductor device with a substrate, an epitaxy layer formed on the substrate, a plurality of deep wells formed in the epitaxy layer, a plurality of trench gate MOSFET units each of which is formed in top of the epitaxy layer between two adjacent deep well, wherein a trench gate of the trench gate MOSFET unit is shallower than half of the distance between two adjacent deep wells, which may reduce the product of on-state resistance and the gate charge of the semiconductor device.

Abstract: An LED driving apparatus includes a rectifier bridge generating a DC bus voltage, a bus capacitor coupled between the output terminal of the rectifier bridge and a reference ground, a tank element, a first transistor, a second transistor, a free-wheeling switch, an output capacitor, a voltage sensing circuit generating a voltage sensing signal indicative of the DC bus voltage, a bleeding circuit providing a bleeding current for the bus capacitor, and a bleeding control circuit generating a control signal to control the bleeding circuit based on the voltage sensing signal.

Abstract: A switching converter includes a main transistor, an inductor coupled to the main transistor, a feedback circuit configured to generate a feedback signal indicative of the output voltage and a controller configured to generate a control signal to control the main transistor. The controller has an on timer, a ramp generator, a comparing circuit and a logic circuit. The on timer is configured to generate an on-time control signal. The ramp generator is configured to generate a ramp signal, wherein the level of the ramp signal is regulated to be equal to the level of a common mode voltage when the status of the main transistor is changed from OFF to ON. The comparing circuit generates a comparison signal based on the ramp signal, the common mode voltage, a reference signal and the feedback signal. The logic circuit generates the control signal based on the on-time control signal and the comparison signal.

Abstract: A method for controlling a multi-phase switching converter with a plurality of switching circuits, including: sensing the output current of the switching circuit and generating a current sensing signal; generating a digital phase current signal based on the current sensing signal; subtracting the digital phase current signal from a current reference signal and generating a current error signal; proportionally integrating the current error signal and generating a first bias signal; conducting a sigma-delta modulation of the first bias signal and generating a second bias signal, wherein the first bias signal is a P-bit digital signal, the second bias signal is a Q-bit digital signal, and P is larger than Q; and adjusting a control signal controlling the switching circuit based on the second bias signal.

Abstract: A short protection circuit for protecting a power switch. The short protection circuit has a transistor and compares a differential voltage between a first end of the power switch and a second end of the power switch to a threshold voltage of the transistor only when the power switch is in an ON state; and wherein when the differential voltage is higher than the threshold voltage, the short protection circuit turns off the power switch.