Abstract: A lateral diode with high breakdown voltage capability and a method for forming the lateral diode. The lateral diode has an anode, a cathode, a substrate having a first conductivity type, an epitaxial layer having formed on the substrate, a current region formed in the epitaxial layer and on the substrate, a first well coupled to the anode, a second well coupled to the cathode, a third well with light doping concentration formed beside the first well, and a guard ring with heavy doping concentration formed in the first well and beside the third well, and between the third well and the second well is a drift region, a lateral breakdown occurs in the third well, the drift region and the second well when a reverse voltage added on the lateral diode is equal to or higher than a breakdown voltage.

Abstract: A dimming module having: a calculating circuit, configured to receive a preset current duty cycle reference signal, a preset current magnitude reference signal and a feedback voltage of an associated light-emitting device string, and to provide a current duty cycle reference signal and a current magnitude reference signal; and a current regulating circuit, configured to receive the feedback voltage of the associated light-emitting device string, the current duty cycle reference signal and the current magnitude reference signal, and to control a duty cycle and a magnitude of the current flowing through the associated light-emitting device string; wherein the current magnitude reference signal provided to the light-emitting device string with the minimum feedback voltage is lower than the preset current magnitude reference signal, while the current magnitude reference signal provided to each other light-emitting device string is higher than the preset current magnitude reference signal.

Abstract: A fault detection method for a multi-phase converter is: sampling currents flowing through a plurality of switching circuits to generate a plurality of current sampling signals; generating a plurality of digital current signals based on a plurality of current sampling signals; generating a plurality of on-time adjustment signals based on differences between each of the plurality of digital current signals and a reference current signal; averaging the plurality of on-time adjustment signals to generate an average adjustment signal; subtracting each of the plurality of on-time adjustment signals from the average adjustment signal to generate corresponding plurality of adjustment error signals; comparing each of the plurality of adjustment error signals with a threshold signal to generate a plurality of fault signals; and adjusting control signals of the plurality of switching circuits based on the plurality of fault signals.

Abstract: A short to ground protecting circuit for an LED driver for providing a power supply voltage for N LED strings. The LED driver has an output terminal for providing a power supply voltage for the N LED strings and N feedback terminals having N detecting voltages respectively. For each i from 1 to N, the ith LED string is coupled between the output terminal and the ith feedback terminal, and the ith feedback terminal is configured to have the ith detecting voltage. The short to ground protecting circuit receives a short threshold voltage and N open fault signals, and generates N short indicating signals. And on the premise of the ith open fault signal is valid, and if the ith detecting voltage is less than the short threshold voltage for a preset time period, the ith short indicating signal is valid.

Abstract: A switched tank converter includes: a first conversion unit and a second conversion unit, each having a clamp capacitor coupled between a first terminal and a third terminal, a high side switch coupled between the first terminal and a switch node, a low side switch coupled between the switch node and a second terminal, and a resonant tank coupled between the switch node and a fourth terminal; and a rectification unit having four rectification switches, wherein a second terminal of the first rectification switch and a first terminal of the third rectification switch are coupled to the fourth terminals of the first and second conversion units, a second terminal of the fourth rectification switch and a first terminal of the second rectification switch are coupled to the third terminals of the first and second conversion units.

Abstract: A synchronous rectifier monitors a driven signal of a synchronous switch. If the driven signal is provided within a set time length, the driven signal is latched off, to make the system enter light load mode.

Abstract: A power supply has a reference regulation circuit and a voltage regulator. The reference regulation circuit receives a VID code and a slew rate command from a processor and regulates a reference voltage based on the VID code and the slew rate command. The voltage regulator converts an input voltage to an output voltage based on the reference voltage. The circuit has a ?-? modulation unit to generate a count duration signal based on a target count signal, wherein the target count signal is generated by dividing a voltage regulation step by the slew rate command, both the target count signal and the count duration signal are digital signals, the target count signal represents a real number having an integer part and a decimal part, the count duration signal represents an integer number, the circuit further regulates the reference voltage based on the count duration signal and the VID code.

Abstract: A current generating circuit generating a current relevant to a reference voltage. The current generating circuit has a reference clock generating circuit generating a reference clock signal which has a frequency relevant to the reference voltage. The current generating circuit has a phase locked loop circuit generating a calibration clock signal. The phase clocked loop circuit regulates the calibration clock signal so that the phase difference between the calibration clock signal and the reference clock signal is reduced. The current generating circuit has also an output circuit generating an output current according to the phase difference between the calibration clock signal and the reference clock signal.

Abstract: A control method used in a switched tank converter with a first conversion unit, a second conversion unit and a rectification unit, includes: based on current flowing through the resonant tanks in the first and second conversion units, determining when to turn on the high side switches of the first and second conversion units, and when to turn on the low side switches of the first and second conversion units; detecting whether current flowing through the first, second, third and fourth rectification switches crosses zero; and based on the detection result, respectively determining when to turn off the high side switch of the first conversion unit, when to turn off the high side switch of the second conversion unit, when to turn off the low side switch of the second conversion unit, and when to turn off the low side switch of the first conversion unit.

Abstract: A COT control circuit used for realizing current sharing in multi-phase DC-DC converter. The multi-phase DC-DC converter has N switching circuits, N controllers, and a trimming current generator receiving N switching voltage signals of the N switching circuits to generate N trimming current signals. The N trimming current signals are respectively sent to the N controllers to regulate on time of at least one controllable switch of each of the N switching circuits so as to finally realize current sharing in the multi-phase circuits.

Abstract: A motor control system has a computing device and a motor controller. The computing device receives user demands through a GUI, and provides a preset speed table based on the user demands. The preset speed table has a plurality of fixed values of a duty cycle of a pulse width modulation signal and a plurality of preset values of a preset motor speed corresponding to the plurality of fixed values of the duty cycle of the pulse width modulation signal. The motor controller provides the pulse width modulation signal to drive a motor based on the preset speed table.

Abstract: A switching power supply circuit has an energy storage component, a synchronous rectifier switch and a synchronous rectifier control circuit. The synchronous rectifier switch is coupled to a secondary side of the energy storage component, and the synchronous rectifier control circuit turns ON the synchronous rectifier switch based on a drain-source voltage across the synchronous rectifier switch when a primary switch is judged as turned ON. When the switching power supply circuit is not operating in a preset mode, the primary switch is judged as turned ON when the drain-source voltage remains larger than a dynamic reference voltage during a preset window time period, and when the switching power supply circuit is operating in the preset mode, the primary switch is judged as turned ON once the drain-source voltage is larger than the dynamic reference voltage.

Abstract: A control method for controlling a battery charging circuit having at least one switch, includes: generating a first difference signal based on a charging current feedback signal and a charging current reference signal; generating a second difference signal based on a battery voltage feedback signal and a battery voltage reference signal; based on a battery voltage, selecting one of the first and second difference signals, and a ground voltage as a third difference signal; generating a bias signal by proportionally integrating the third difference signal; comparing the sum of a system voltage feedback signal and a ramp signal with the sum of the bias signal and a system voltage reference signal and generating a comparison signal; generating a control signal to control the at least one switch of based on the comparison signal and a constant time period control signal.

Abstract: A control circuit having power limit for controlling an AC-DC voltage converter. The control circuit includes a first sensing circuit having an auxiliary winding used to sense a voltage on an inductive element of the converter to generate a first sensing signal, a second sensing circuit used to sense the current flowing through the inductive element to provide a second sensing signal, and a power limit circuit. The power limit circuit generates a power indication signal indicative of the input power of the converter based on the first sensing signal and the second sensing signal. When the power indication signal is larger than a power threshold, a controllable switch of the converter is turned off.

Abstract: A synchronous rectifier OFF control module and a synchronous rectifying control circuit. The synchronous rectifier OFF control module may receive a zero-cross threshold signal and a drain-source voltage signal indicative of a drain to source voltage of a synchronous rectifier, and to compare the drain-source voltage signal with the zero-cross threshold signal to determine whether the rectifier current flowing through the synchronous rectifier is crossing zero. The synchronous rectifier OFF control module may further receive a peak current detection signal indicative of a peak value of the rectifier current, and to adjust the magnitude of the zero-cross threshold signal to vary in the same direction as the peak value of the rectifier current based on the peak current detection signal. The synchronous rectifier OFF control module may provide more accurate control to the turn OFF moment of the synchronous rectifier and thus can help to reduce power loss.

Abstract: A battery balancing method and circuit for balancing the voltages between battery units with a fly capacitor. In a first time period of a switching cycle, the first battery unit is used to charge the fly capacitor or the first battery unit is used to discharge the fly capacitor, depending on which of the first battery unit and the fly capacitor having a larger voltage value; and in a second time period of the switching cycle, the second battery unit is used to charge the fly capacitor or the second battery unit is used to discharge the fly capacitor, depending on which of the second battery unit and the fly capacitor having a larger voltage value.

Abstract: A control method of a PFC (Power Factor Correction) circuit having at least one power switch, the control method having: producing an effective value of an input voltage; generating a compensation signal based on an output voltage and an output voltage reference signal; generating an on time signal based on the compensation signal, the effective value of the input voltage, a first on time period value and a second on time period value; generating an on time delay signal based on the input voltage, the output voltage, the first on time period value, the effective value of the input voltage and the compensation signal; and generating a current valley signal based on the input voltage, the effective value of the input voltage, the compensation signal, the second on time period value, and an inductance value of the inductor adopted by the PFC circuit.

Abstract: Input AC voltage sensing for a flyback circuit. The flyback circuit is configured as “primary-high”, namely a primary switch of the flyback circuit is positioned “high” to receive an input AC voltage through a first rectifying circuit. A primary winding of the flyback circuit is coupled to a primary ground reference. A voltage sensing circuit has a processing circuit and a first sensing resistor. The processing circuit has a first terminal coupled to the input AC source through a second rectifying circuit, a second terminal coupled to the primary ground reference and an output terminal. The processing circuit subtracts a voltage at the second terminal from a voltage at the first terminal to obtain a differential voltage, which is then sampled and held as an input AC voltage sensing signal.

Abstract: A current threshold regulation method is used in a switching converter with a tank element and a transistor. The current threshold regulation method includes: detecting whether the input voltage is lower than an input under voltage threshold and generating an input under voltage indication signal; detecting whether the output voltage is lower than an output under voltage threshold and generating an output under voltage indication signal; generating a current threshold based on the input under voltage indication signal and output under voltage indication signal; comparing a current flowing though the tank element with the current threshold and generating a current comparison signal; and generating a control signal based on the current comparison signal to control the transistor.

Abstract: A driving circuit and driving method for driving a synchronous rectifier. When a drain-source detecting voltage between a drain terminal and a source terminal of the synchronous rectifier reaches a second reference voltage, the driving voltage applied at a gate terminal of the synchronous rectifier is decreased to regulate the drain-source detecting voltage to a first reference voltage. The first reference voltage is lower than the second reference voltage. And when the drain-source detecting voltage reaches an off reference voltage, the synchronous rectifier is turned off.