Abstract: A control circuit for controlling a switching converter having a low quiescent current. The control circuit has an error amplifying circuit, an on time generator, a first comparing circuit and a second comparing circuit. When the switching converter operates in a light load operation mode, the error amplifying circuit and the on time generator are deactivated. Meanwhile, the first comparing circuit compares a current sensing signal indicative of inductor current with a current reference signal to provide an off time control signal during an on state of a low side switch to determine an on moment of a high side switch. The second comparing circuit compares the voltage feedback signal with a voltage reference signal to provide an on time control signal to determine an off moment of the high side switch.

Abstract: A bi-directional buffer for applications using in an I2C or SMBUS or other bus systems. The bi-directional buffer has an input terminal to receive an input voltage signal and an output terminal for providing an output voltage signal, and the output voltage signal follows the input voltage signal. The output voltage signal is regulated to have a first bias voltage greater than the input voltage signal by a first operational amplifier, or to have a second bias voltage greater than the input voltage signal by a second operational amplifier, the second bias voltage is smaller than the first bias voltage.

Abstract: An IC package structure and an IC package unit are disclosed. The IC package includes an array of metal wall grids formed into a panel, each one of the metal wall grids having a continuous and closed metal wall to surround an IC package unit with at least one IC chip/IC die disposed therein. Each IC chip/IC die has a top surface with a plurality of metal pads formed thereon. A panel-shaped metal layer is formed on entire back side of the panel of the array of metal wall grids and bonded to the metal wall of each metal wall grid. A panel-shaped rewiring substrate having a plurality of metal pillars is connected to each IC chip/IC die with each one of the plurality of metal pillars soldered with a corresponding one of the plurality of metal pads.

Abstract: A clock self-testing method and circuit. The clock self-testing method includes introducing a first clock signal and a second clock signal, counting cycles of the first clock signal and the second clock signal respectively beginning at the same moment, and if one of the number of cycles of the first clock signal being counted and the number of cycles of the second clock signal being counted is equal to N, determining whether the remained number of cycles is in a count range from M to N. If the remained number of cycles is out of the count range from M to N, the first clock signal and the second clock signal have errors.

Abstract: A driving circuit providing a driving signal at a driving terminal to drive a power switch. The driving signal has a first driving period and a second driving period. Both the first driving period and the second driving period have a first driving time interval. The driving circuit has a first equivalent on resistor established during the first driving time interval and located between a first voltage node and the driving terminal. The first equivalent on resistor has a first equivalent on resistance during the first driving time interval of the first driving period and has a second equivalent on resistance during the first driving time interval of the second driving period. The first equivalent on resistance and the second equivalent on resistance are not equal.

Abstract: A switching mode power supply preventing a first switch from being falsely triggered. The switching mode power supply detects a peak of an input signal and starts timing a period of time since the arrival of the peak of the input signal is detected. The first switch starts performing the on and off switching operations when the period of time expires.

Abstract: A multiphase switching converter has a plurality of switching circuits coupled in parallel, and a plurality of control circuits configured in a daisy chain. Each control circuit receives a phase input signal, and provides a phase output signal and a switching control signal for controlling a corresponding switching circuit. One of the control circuits is a master control circuit, if a fault is detected by the master control circuit, then the master control circuit provides the phase output signal satisfying a master transfer type, and then the master control circuit changes to a slave control circuit.

Abstract: A turn-off protection circuit and a turn-off protection method for a switch unit. The switch unit may include a first set of switching devices coupled between a first circuit node and an output node, and a second set of switching devices coupled between a second circuit node and the output node. The turn-off protection circuit may compare a first circuit node potential at the first circuit node and/or a second circuit node potential at the second circuit node with a switch node potential at the output node to detect a the flow direction of the a freewheeling current when the switch unit is turned off, and turn on and maintain the first set of switching devices or the second set of switching devices on depending on the flow direction of the freewheeling current until the freewheeling current is reduced to a predetermined safe current threshold.

Abstract: A dimming circuit for dimming a current flowing through a light emitting device, having: a multi-function pin, configured to receive a dimming signal; wherein when the dimming signal is an analog voltage signal, an amplitude of the current flowing through the light emitting device is regulated based on the dimming signal; when the dimming signal is a pulse signal and a frequency of the dimming signal is in a first frequency range, a duty cycle of the current flowing through the light emitting device is regulated based on the dimming signal; and when the dimming signal is the pulse signal and the frequency of the dimming signal is in a second frequency range, the amplitude of the current flowing through the light emitting device is regulated based on the dimming signal.

Abstract: A phase sequence correction circuit for a voltage converter has a blanking time calculation circuit and a control signal generation circuit. Based on a plurality of delay signals, the blanking time calculation circuit updates a blanking time period during which a immediately following switching circuit is not allowed on. If a sum of the plurality of delay signals is larger than an incremental threshold, then the blanking time signal increases by an incremental step. The control signal generation circuit receives the blanking time signal and provides a plurality of control signals to control a plurality of switching circuits of the voltage converter respectively. If a sum of the plurality of delay signals is larger than an incremental threshold, then the blanking time signal increases by an incremental step.

Abstract: A discharge circuit for an X capacitor has a first voltage detection circuit providing a first indicating signal based on a voltage across two input terminals of a switching converter to indicate whether the two input terminals are connected to an AC power source, and a discharge module starting a discharge operation on the X capacitor based on first indicating signal, and the discharge operation discharges the X capacitor during a first time period, and stops discharging the X capacitor and compares a sampled signal with the voltage across the two input terminals during a following second time period.

Abstract: A power management circuit has a power input terminal coupled to a power supply or a load, a power terminal configured to provide an output voltage, and a battery terminal coupled to a battery. The power management circuit further has a current limiting circuit, an over-current indication circuit and an over-current threshold selecting circuit. The current limiting circuit compares a current feedback signal indicative of an output current flowing out of the power terminal with a current threshold signal and generates a square wave signal. The over-current indication circuit generates an over-current indication signal based on the square wave signal. The over-current threshold selecting circuit selects a first over-current threshold voltage or a second over-current threshold voltage as an over-current threshold voltage based on the over-current indication signal, wherein the first over-current threshold voltage is higher than the second over-current threshold voltage.

Abstract: An isolated switching converter has a primary switch and a control circuit. The control circuit has a first sampling circuit, a second sampling circuit, a compensation circuit and a feedback control circuit. The first sampling circuit is coupled to an auxiliary winding of a transformer to receive a voltage on the auxiliary winding and is configured to generate a first feedback signal having an alternating current signal indicative of an output voltage. The second sampling circuit is coupled to the auxiliary winding through a first rectifier and is configured to generate a second feedback signal having a direct current signal indicative of the output voltage. The compensation circuit is configured to generate a compensation signal based on the first feedback signal, the second feedback signal and a reference threshold. The feedback control circuit is configured to generate a primary control signal of the primary switch based on the compensation signal.

Abstract: A battery charging circuit providing a charging current to a battery via a charging transistor. A control circuit used to control the battery charging circuit has a system voltage control loop providing a system voltage compensation signal, a charging current control loop providing a charging current compensation signal and a charging transistor control loop providing a charging regulation signal based on a charging transistor reference signal and the system voltage feedback signal.

Abstract: A daisy-chain battery cells system having a plurality of differential communication interfaces {F(i), i=1, . . . , N} respectively coupled to a plurality of voltage measuring modules {S(i), i=1, . . . , N} for a plurality of battery cells {C(i), i=1, . . . , N}. For each i=1, . . . , N?1, a first high side differential pin pair (CLU(i)+, CLU(i)?) of the ith differential communication interface F(i) is coupled to a first low side differential pin pair (CLL(i+1)+, CLL(i+1)?) of the (i+1)th differential communication interface F(i+1), and a second high side differential pin pair (DAU(i)+, DAU(i)?) of the ith differential communication interface F(i) is coupled to a second low side differential pin pair (DAL(i+1)+, DAL(i+1)?) of the (i+1)th differential communication interface F(i+1). A low side interface FL(1) of the first differential communication interface F(1) is coupled to a controller. A high side interface FU(N) of the Nth differential communication interface F(N) may receive a preset data/signal.

Abstract: A switching mode power supply with an adaptive setting of a threshold valley voltage. The switching mode power supply decreases a reference auxiliary current when a valley value of a primary switching voltage across a primary switch is smaller than a first threshold valley voltage. And in addition, the switching mode power supply can increase the reference auxiliary current when the valley value of the primary switching voltage is larger than a second threshold valley voltage.

Abstract: A control circuit and control method for controlling a step-up switching converter. The control circuit has an ultra-low voltage regulation module used to generate a control signal based on an output voltage feedback signal and an input voltage signal. When the input voltage signal is smaller than an ultra-low voltage threshold, the control signal controls a high side switch of the step-up switching converter off and controls a low side switch of the step-up switching converter to perform on and off switching. Meanwhile, a parasitic diode of the high side switch is on once the low side switch is off.

Abstract: A control circuit of a zero current controlled dimming circuit having a high side power switch, a low side power switch and an inductor, having: an error circuit, providing a compensation signal based on a reference signal and a current sense signal indicative of an output current; a compensation circuit, providing a compensation off time signal based on the compensation signal and a peak value sample and hold signal indicative of a peak value of an inductor current; and a control signal generating circuit, providing a low side switch control signal to control the low side power switch based on the compensation off time signal, wherein after the inductor current decreases to zero, the low side power switch maintains on for a compensation off time period determined by the compensation off time signal.

Abstract: A switching regulator with improved load regulation is discussed. The switching regulator increases an on time length of a first power switch if the switching regulator operates at discontinuous current mode and a current flowing through the second power switch crosses a zero reference, until the first power switch is turned on again; and the switching regulator maintains the on time length of the first power switch during other time period.

Abstract: A power converter includes a first and a second transformers having different auxiliary winding voltage levels. A bias voltage supply circuit generates a bias supply voltage of an integrated circuit used to control the power converter, and includes a first and a second bias supply branches jointly coupled to a supply capacitor to provide the bias supply voltage. When the bias supply voltage is higher than a threshold voltage, the first bias supply branch to receive the one with lower level of the two auxiliary winding voltages is switched from a deactivation state to an activation state to provide the bias supply voltage, when the bias supply voltage is less than the threshold voltage, the second bias supply branch to receive the one with larger level of the two auxiliary winding voltages is switched from the deactivation state to the activation state to provide the bias supply voltage.