Abstract: A control method is disclosed to generate a control signal in a power supply with a synchronous rectifier. The control signal turns ON the synchronous rectifier to provide a channel approximately short-circuited if the control signal is greater than a threshold voltage, and turns OFF the synchronous rectifier to turn the channel into an open circuit if the control signal is between the threshold voltage and a ground reference voltage. A detection signal is generated based on one end of the channel, and compared with a predetermined level higher than the ground reference voltage. An excitation time is a period when the detection signal exceeds the predetermined level. When the excitation time exceeds a preset time, the control signal is precharged to a sub-threshold voltage between the threshold voltage and the ground reference voltage.

Abstract: Disclosed is a high-voltage device with ESD robustness. The high-voltage device is formed on a surface of a semiconductor substrate of a first type. A deep well of a second type opposite to the first type is formed on the surface. A filed isolation layer on the surface separates a drain active region from a source active region, and a control gate on top of the field isolation layer serves as a gate electrode of the high-voltage device. A first well of the second type at least partially overlaps the source active region, extends below the field isolation layer and at least partially overlaps the control gate. A buried layer of the first type at a bottom of the deep well has an extensive portion below the control gate. The deep well provides a conductive channel allowing current to flow from the drain active region to the source active region.

Abstract: A power supply has multiple DC power sources converted from an AC power source. The power supply has an isolated converter converting the AC power source into an intermediate DC power source, and non-isolated converters converting the intermediate DC power source into the DC power sources, regulated at target output values respectively. A communication channel connects the isolated converter and one of the non-isolated converters, and transmits a feedback signal in association with the target output values. The isolated converter, in response to the feedback signal, regulates the intermediate DC power source at an intermediate target value related to the target output values.

Abstract: A control method is in use of an interleaved power converter with first and second power stages for generating an output power source. A compensation is generated in response to a feedback signal and a reference voltage, and the feedback signal represents the output power source. The output power of the first power stage is controlled to supply to the output power source in response to the compensation signal. The operation status of the second power stage is switched in response to the compensation signal and the feedback signal, and is prevented from being switched when the feedback signal is beyond a stable range covering the reference voltage.

Abstract: A PFC power converter includes a power switch and an inductive device. A compensation signal is provided in response to an output voltage of the PFC power converter. An adapted compensation signal is provided in response to an ON time of the power switch and the compensation signal, to make the adapted compensation signal, the ON time, and the adapted compensation signal fit a predetermined correlation. The ON time of the power switch is determined in response to the adapted compensation signal. The PFC power converter is capable of achieving high PF when operating in discontinuous conduction mode.

Abstract: An operation power source for an operation power source supplying power to a synchronous rectifier controller is charged according to the invention. The synchronous rectifier controller controls a synchronous rectifier in response to a channel signal of the synchronous rectifier, generating SR ON times and SR OFF times. It is determined whether the channel signal resonates in a first SR OFF time, to provide an oscillation record accordingly. In a second SR OFF time after the first SR OFF time, in response to the oscillation record, a portion of resonance energy that causes the channel signal resonating is directed to charge the operation power source.

Abstract: A control method is provided for operating a power converter with a power switch and an inductive device. A current-sense signal is provided to represent an inductor current through the inductive device. An ON time of the power switch is determined in response to a feedback signal and a saw-wave signal, to operate the power converter in a non-power-saving mode. The feedback signal is generated according to an output voltage of the power converter. The power converter can be operated in a power-saving mode, a burst mode. Operating in the burst mode, the ON time is determined in response to the current-sense signal and a current-limiting signal, which is increased during a soft burst-in time and is decreased during a soft burst-out time.

Abstract: A control method in use of a flyback power converter is disclosed to provide an operation power source supplying power to a power controller controlling a main power switch. The flyback power converter has a transformer with a primary winding and an auxiliary winding. The main power switch and the primary winding are connected in series. A chopper switch and a buffer inductor are connected in series between the auxiliary winding and the power controller. The power controller turns ON the main power switch for an ON time to energize the transformer, and turns ON the chopper switch for at least a time period during the ON time, so that during the time period the buffer inductor conducts an induced current flowing from the auxiliary winding and through the chopper switch, to build up the operation power source.

Abstract: A control method is disclosed to prevent false triggering of over-current protection. A power converter comprises high-side and low-side switches connected in series between an input power line and a ground line, for driving a resonant circuit to resonate. The power converter includes a detector detecting the resonant circuit to provide a detection signal representing a magnitude of resonance in the resonant circuit. A duty cycle of one of the high-side and low-side switches is detected, and a threshold is determined in response to the duty cycle. An over-current protection is triggered based on the threshold and the detection signal. When the over-current protection is triggered, at least one of the high-side and low-side switches stops providing power to the resonant circuit, and the resonance subsides.

Abstract: High-voltage semiconductor devices are disclosed, each having gate, source and drain electrodes. A deep well layer is formed on a substrate and has a surface, where the substrate and the deep well layer are of first-type and second-type conductivities, respectively. A field isolation layer on the surface isolates a drain active region from a source active region. The source electrode contacts the source active region on the surface to form an ohmic contact. The drain electrode contacts the drain active region on the surface. A first well layer of the first-type conductivity is formed on the surface and between the ohmic contact and the drain active region, and at least a portion of the first well layer is under the field isolation layer. A bottom layer of the first-type conductivity is formed at a bottom of the deep well layer. The gate electrode is on the field isolation layer.

Abstract: A connector controller controls a connector with a power pin, a communication pin, and a ground pin. The connector detects the voltage at the communication pin at least twice to generate first and second voltages respectively. A bus power is supplied at the power pin. The first voltage is detected when a bus current to/from the bus power is about zero. The connector controller controls the bus power in response to a difference between the first and second voltage.

Abstract: The invention discloses a control method in use of a synchronous rectifier controller, controlling a synchronous rectifier in a power supply supplying power a load. The synchronous rectifier is turned ON in response to a terminal signal of the synchronous rectifier. An ON-time of the synchronous rectifier is made not less than a minimum ON-time. A detection result in association with the load is provided, for determining the minimum ON-time. The minimum ON-time is a first period when the detection result indicates the load as a first load, and a second period, shorter than the first period, when the detection result indicates the load as a second load heavier than the first load.

Abstract: A high-voltage semiconductor device integrates a MOS transistor with a Schottky barrier diode. The MOS transistor has a semiconductor substrate of a first conduction type, a well of a second conduction, a body of the first conduction type, and a doped source of the second type. A control gate formed above the body controls electric connection between the doped source and the well. The Schottky barrier diode has a metal, functioning to be an anode of the Schottky barrier diode and contacting the well to form a Schottky barrier junction therebetween.

Abstract: A flyback power converter converts an input power on a primary side into an output power on a secondary side. On the secondary side, the output power is monitored to provide a representative signal representing a characteristic of the output power. A count is kept unchanged when a clock ticks if the representative signal is within a first range defined in accordance with a target value, that the representative signal is going to be regulated at. The count is changed in response to the clock if the representative signal is within a second range different from the first range. In response to the count, a driving current is generated to control a coupler, which generates a compensation signal on the primary side that controls power transmitted from the primary side to the secondary side.

Abstract: A power supply has a transformer, a rectifier switch, a secondary-side controller and two diodes. The transformer includes a primary winding, a secondary winding, and a detection winding, inductively coupling to one another. The rectifier switch is connected in series with the secondary winding between two output power lines. The secondary-side controller is electrically coupled to two ends of the detection winding, for controlling the rectifier switch in response to two terminal signals at the two ends respectively. The two diodes are back-to-back electrically connected in series between the two ends, and a joint connecting the two diodes is electrically connected to one of the two output power lines.

Abstract: A power controller for an LLC resonant converter controls a high-side switch and a low-side switch. An ON-time generator in the power controller determines a high-side ON time of the high-side switch and a low-side ON time of the low-side switch in response to the bigger one between a feedback voltage and a burst voltage, where the feedback voltage is generated in response to an output voltage of the LLC resonant converter. A burst-mode controller in the power controller has a triangular-wave generator providing a triangular-wave signal with an amplitude in association with the burst voltage. A comparator comparing the triangular-wave signal and the feedback voltage to determine a break time when both the high-side and low-side switches are turned OFF. The LLC resonant converter operates in a burst mode when the break time is introduced.

Abstract: A semiconductor apparatus includes first, second and third transistors integrated in a monocrystal chip. Both the first and second transistors are vertical devices, each having a source node, a gate node and a drain node. The source node of the first transistor electrically connects to a primary source pin, the source node of the second transistor to a sample pin, and the gate nodes of the first and the second transistors to a control-gate pin. The third transistor is a vertical JFET with a source node, a control node and a drain node. The source node of the third transistor electrically connects to a charge pin, and the control node of the third transistor to a charge-control pin. All of the drain nodes of the first, second and third transistors are electrically connected to a high-voltage pin.

Abstract: A power supply is configured to limit its output power, converting an input voltage on a primary side into a bus voltage on a secondary side. A current-sense resistor detects a bus current output from the power supply to provide a current-sense signal. A bus switch is electrically connected to a secondary winding on the secondary side, configured to selectively supply power to the bus voltage. A power delivery controller controls the bus switch in response to the current-sense signal and a power detection signal on the secondary side. The power delivery controller provides a power threshold in response to the bus voltage, compares the power detection signal with the power threshold, and turns off the bus switch to stop supplying power to the bus voltage if the power detection signal exceeds the power threshold, thereby limiting the output power of the power supply.

Abstract: Disclosure includes a control method in use of a switching-mode power supply that supplies an output voltage to a load. A line voltage generated by rectifying an alternating-current voltage is detected to compare with a first reference voltage. A control signal is generated in response to the comparison of the line voltage and the first reference voltage. When the line voltage is less than the first reference voltage, the control signal is used to increase converted power that the switching-mode power supply provides to the output voltage. When the line voltage is not less than the first reference voltage, the control signal has no influence to the converted power.

Abstract: A power controller for use in a PFC power converter is capable being immune from audible noise during the test of load transient response. A transconductor with a transconductance compares an output voltage of the PFC power converter with a target voltage to provide a compensation current, which builds up a compensation voltage. An ON-time controller is configured to end an ON time of a power switch in response to the compensation voltage. An OFF-time controller is configured to end an OFF time of the power switch. A compensation-voltage designator presets the compensation voltage. A status detector controls the transconductor, the ON-time controller, the OFF-time controller, and the compensation-voltage designator, in response to the output voltage, a top-boundary voltage and a bottom-boundary voltage.