Abstract: A semiconductor device includes an epitaxial layer on a substrate, a first body region and a first trench gate structure in the epitaxial layer, a first planar gate and a first source electrode on the epitaxial layer, a first source region in the first body region, and a drain electrode under the substrate. The first trench gate structure is extended along a first direction and adjacent to the first body region. The first planar gate is extended along a second direction and at least partially located directly above the first body region. There is a non-zero included angle between the second direction and the first direction. The first source electrode is extended downward into the first body region. The first source region is at least partially adjacent to the first source electrode.

Abstract: A semiconductor device includes a substrate having a first conductivity type, a well region having a second conductivity type and disposed on the substrate, a first trench and a second trench disposed in the well region. In addition, a first field plate and a first dielectric layer surrounding the first field plate are disposed in the first trench. A second field plate and a second dielectric layer surrounding the second field plate are disposed in the second trench. A first gate is disposed above the first field plate. A source electrode is disposed on a first side of the first trench, and a drain electrode is disposed on a second side of the second trench. The source electrode, the first trench, the second trench and the drain electrode are sequentially arranged along a first direction.

Abstract: A semiconductor device includes a substrate and a well region both having a first conductivity type, a trench in the substrate and directly above the well region, a first trench gate and a second trench gate disposed in the trench and laterally separated from each other, a dielectric isolation portion disposed in the trench and between the first and second trench gates, and a dielectric liner in the trench and under bottom surfaces of the first and second trench gates. A middle region of a bottom surface of the dielectric isolation portion protrudes downward and is lower than two side regions of the bottom surface of the dielectric isolation portion. Below a horizontal line of the bottom surfaces of the first and second trench gates, the thickness of the dielectric isolation portion is greater than the thickness of the dielectric liner.

Abstract: A constant-current control device for a power supply including a primary side switch and a secondary winding includes a voltage waveform detector, configured to generate a discharging period signal within a time length when the secondary winding is discharging according to a first feedback voltage and a control voltage; and a constant-current controller, wherein an integrator of the constant-current controller is configured to receive one of a first current source and a second current source according to the discharging period signal and a current detecting voltage to generate an integrator result voltage, wherein the current detecting voltage is related to a secondary winding current value flowing through the secondary winding and the secondary winding current value is positively related to a secondary output current value of the power supply.

Abstract: A synchronized rectification control method for use in a flyback converter is provided. The flyback converter includes a transformer including a secondary winding, a synchronous rectifier switch and a synchronous rectifier controller. The synchronous rectifier switch is coupled to the secondary winding and the synchronous rectifier controller, and is used to output a voltage difference signal and receive a control voltage. The method includes the synchronous rectifier controller detecting a rapid falling edge of the voltage difference signal to generate a rapid falling edge signal, generating an envelope signal according to the voltage difference signal, generating a time length control signal according to the voltage difference signal and the envelope signal, generating a blanking time signal according to the voltage difference signal and the time length control signal, and performing a logic operation on the blanking time signal and the rapid falling edge signal to generate the control voltage.

Abstract: A voltage supply circuit includes a rectifier circuit, a charging circuit, a feedback circuit and an energy storage circuit. The rectifier circuit is used to receive an input voltage to generate a rectified energy. The charging circuit is coupled to the rectifier circuit and has a modulation input terminal and an energy supply terminal. The modulation input terminal is used to receive a modulation voltage, and the energy supply terminal is used to selectively output a charging current according to the modulation voltage. The feedback circuit is used to receive a high voltage signal and a supply voltage, and output the modulation voltage to the modulation input terminal. The feedback circuit is used to adjust the modulation voltage according to a difference between the supply voltage and a reference voltage. The energy storage circuit is charged by the charging current to pull up the supply voltage.

Abstract: A power controller with short-circuit protection is disclosed to control a power switch, which is connected in series with a current-sense resistor and an inductive device between two power lines. The current-sense resistor provides a current-sense signal. The power controller includes a PWM signal generator and a short-circuit protection circuit. The PWM signal generator generates a PWM signal to the power switch to create switching cycles, each consisting of an ON time and an OFF time. The short-circuit protection circuit has a high-pass filter and a condition detector. The high-pass filter high-pass filters the current-sense signal to provide a filtered signal to the condition detector, which determines whether the filtered signal fits a predetermined condition during the ON time to generate a short-circuit protection signal and to prevent the power switch being turned on.

Abstract: The synchronous rectifier controller includes a voltage regulator to provide a control voltage to the control terminal of the rectifier switch. The synchronous rectifier controller compares the channel voltage of the rectifier switch with a threshold voltage to generate a comparison result signal. When the channel voltage is greater than the threshold voltage, the comparison result signal has a first logic value, and when the channel voltage is less than the threshold voltage, the comparison result signal has a second logic value. An inverted comparison result signal is generated according to the comparison result signal. When the channel voltage is less than the threshold voltage, the inverted comparison result signal enables a pull-up power supply to pull up the control voltage; and when the channel voltage is greater than the threshold voltage, the comparison result signal enables a pull-down power supply to pull down the control voltage.

Abstract: A synchronous rectifier controller for controlling a rectifier switch is disclosed. The synchronous rectifier controller includes a fully-ON controller and a regulator. Capable of being triggered by a channel voltage of the rectifier switch, the fully-ON controller turns the rectifier switch fully ON for a fully-ON time in view of a predetermined condition. The regulator, disabled during the fully-ON time and enabled after the fully-ON time, turns the rectifier switch ON to regulate the channel voltage within a predetermined voltage range.

Abstract: A filter capacitor discharge circuit includes a high-voltage terminal, a signal preparation circuit, a low-pass filter, a voltage level detector, a timer unit, and a switch unit. The signal preparation circuit receives a detection signal corresponding to an AC voltage from the high-voltage terminal, and generates a voltage signal according to the detection signal. The low-pass filter provides a filtered signal according to the voltage signal. The voltage level detector checks whether a voltage difference between the voltage signal and the filtered signal is less than a predetermined value. When the voltage difference is less than the predetermined value, the timer unit performs time calculation to accumulate a timing result. When the timing result exceeds a predetermined time, the switch unit is turned on so that the firster capacitor is discharged through the switch unit.

Abstract: A charging system includes a primary power source, a power source controller coupled to the primary power source, a first switch, a third switch, and a first port. The power source controller includes an auxiliary power source, a first auxiliary power terminal coupled to the auxiliary power source for providing a first detection current, and a load detection circuit. The power source controller initially sets the first switch to be off, the third switch to be on, and the first auxiliary power terminal to provide the first detection current to the first port through the third switch. When the first detection current is less than a threshold value, the power source controller maintains the first switch to be off, the third switch to be on, and the first auxiliary power terminal to provide the first detection current through the third switch.

Abstract: A constant-current control device for a power supply including a primary side switch and a secondary winding includes a voltage waveform detector, configured to generate a discharging period signal within a time length when the secondary winding is discharging according to a first feedback voltage and a control voltage; and a constant-current controller, wherein an integrator of the constant-current controller is configured to receive one of a first current source and a second current source according to the discharging period signal and a current detecting voltage to generate an integrator result voltage, wherein the current detecting voltage is related to a secondary winding current value flowing through the secondary winding and the secondary winding current value is positively related to a secondary output current value of the power supply.

Abstract: A flyback converter includes a primary winding, a main switch, a charging switch, a primary side controller and an energy storage device. The primary winding receives an input power; the primary side controller has a power input terminal and provides a first control signal and a second control signal to the main switch and the charging switch; after the main switch is turned off, the charging switch maintains turned on during a charging period. During the charging period, the input power passes through the primary winding and the charging switch, and stores a first portion of the input power in the energy storage device as a power supply energy; the power input terminal is coupled to the energy storage device, and the primary side controller receives the power supply power from the energy storage device through the power input terminal.