Patent application number | Description | Published |
20100201336 | Voltage mode switching regulator and control circuit and method therefor - The present invention discloses a voltage mode switching regulator with improved light load efficiency and mode transition characteristic, and a control circuit and a control method therefor. The switching regulator can switch between a pulse width modulation (PWM) mode and a pulse skipping mode. The control method for the switching regulator comprises: comparing a feedback signal relating to an output voltage with a reference signal, to generate an error amplification signal; generating a duty signal according to the error amplification signal and a ramp signal, to control the switching regulator; setting a threshold level of the error amplification signal and a threshold level of the pulse skipping mode according to the error amplification signal in a stable status; and when the error amplification signal is close or equal to the threshold level of the pulse skipping mode, generating a pulse skip signal to enter the pulse skipping mode. | 08-12-2010 |
20100301822 | Switching regulator and control circuit thereof, and method for determining on-time in switchng regulator - The present invention discloses a switching regulator and control method thereof, and a method for determining On-time in switching regulator. The switching regulator comprises: a power switch circuit including at least one power transistor switch which operates to convert an input voltage to an output voltage; a PWM generation circuit for generating a duty signal in a normal operation mode according to a feedback signal relating to the output voltage; a pulse skipping circuit for determining On-time in a pulse skipping mode according to a node with non-constant voltage level, the node being connected with the power transistor switch; and a driver circuit for driving the at least one power transistor switch according to one of the outputs from the PWM generation circuit and the pulse skipping circuit. | 12-02-2010 |
20110018514 | Dual-mode buck switching regulator and control circuit therefor - The present invention discloses a dual-mode buck switching regulator, comprising: a first power transistor having an end coupled to an input voltage and another end coupled to a common node; an inductor having an end coupled to the common node and another end coupled to the input voltage; a second power transistor having an end coupled to ground; a diode having an end coupled to ground; and a control circuit generating a first and a second switch control signals for controlling operations of the first and the second power transistors according to a feedback signal, and generating a mode selection signal according a mode control signal to select a synchronous or an asynchronous mode, wherein the second power transistor has another end which is coupled to the common node in the synchronous mode, and the diode has another end which is coupled to the common node in the asynchronous mode, and in the asynchronous mode: the another end of the second power transistor is not coupled to the common mode, or the second power transistor maintains off. The present invention also relates to a control circuit of the dual-mode buck switching regulator. | 01-27-2011 |
20110068761 | AVERAGE CURRENT REGULATOR AND DRIVER CIRCUIT THEREOF AND METHOD FOR REGULATING AVERAGE CURRENT - The present invention discloses an average current regulator, a driver circuit of an average current regulator, and a method for regulating an average current. The average current regulator includes: a power stage including at least one power transistor which switches according to a pulse width modulation (PWM) signal to convert an input voltage to an output current; a feedback circuit coupled to the power stage, for generating a feedback signal; an ON-time controller coupled to the feedback circuit, for receiving the feedback signal and generating an ON-time signal according to the feedback signal and an average reference signal relating to a target average current; and a PWM controller, for generating the PWM signal according to the ON-time signal to regulate the average of the output current to the target average current. | 03-24-2011 |
20110089854 | Circuit And Method for Controlling Light Emitting Device, And Integrated Circuit Therefor - The present invention discloses a circuit and a method for controlling a light emitting device, and an integrated circuit therefore. The circuit for controlling a light emitting device comprises: a power stage controller circuit controlling a power stage circuit to convert an input voltage to an output voltage, which is supplied to at least one light emitting device channel including at least one light emitting device; a transistor switch in the light emitting device channel; and a current source circuit controlling a current through the light emitting device channel, wherein the power stage controller circuit and the current source circuit are integrated in an integrated circuit which provides a control voltage to control a gate of the transistor switch. | 04-21-2011 |
20110109238 | Digital dimming device and digital dimming method - The present invention discloses a digital dimming device and a digital dimming method, for controlling a plurality of light emitting device channels. The method comprises: generating a corresponding plurality of driving signals to control the plurality of light emitting device channels; receiving a PWM input signal having a duty ratio, and phase shifting the PWM input signal to generate multiple PWM output signals with about the same duty ratio as the PWM input signal, but with respectively shifted phases; and enabling or disabling corresponding driving signals by the multiple PWM output signals, respectively. | 05-12-2011 |
20130038388 | AUTO-ZERO AMPLIFIER AND SENSOR MODULE USING SAME - An auto-zero amplifier is disclosed, having an amplifying circuit, a switch, and a difference signal generating circuit. The amplifying circuit receives a first input signal for generating a first output signal, and receives a second input signal for generating a second output signal. The switch is coupled between the amplifying circuit and a capacitor. The switch is conducted for charging or discharging the capacitor to a voltage with the first output signal, and the switch is not conducted for keeping the capacitor at the voltage. The difference signal generating circuit is coupled with the amplifying circuit and the capacitor for generating a difference signal of the first output signal and the second output signal, a multiple of the difference signal, a part of the difference signal, and/or a digital output value for the difference signal. | 02-14-2013 |
20130057237 | MULTI-PHASE SWITCHING REGULATOR AND DROOP CIRCUIT THEREFOR - The present invention discloses a multi-phase switching regulator and a droop circuit therefor. The droop circuit includes: multiple first resistors, which are coupled to corresponding phase nodes respectively to sense current through the phase nodes; a second resistor, which is coupled to the multiple first resistors; an error amplifier circuit, which has an inverting input end and a non-inverting input end, wherein the inverting input end is coupled to the second resistor and an output end of the error amplifier circuit, and the non-inverting input end is coupled to an output node; and a droop capacitor, which is coupled between the second resistor and the output node; wherein the droop circuit provides the droop signal according to a voltage drop across the second resistor or current through the second resistor. | 03-07-2013 |
20130113049 | FUSE CIRCUIT FOR FINAL TEST TRIMMING OF INTEGRATED CIRCUIT CHIP - The present invention discloses a fuse circuit for final test trimming of an integrated circuit (IC) chip. The fuse circuit includes at least one electrical fuse, at least one control switch corresponding to the electrical fuse, and a resistant device. The electrical fuse is connected with the control switch in series between a predetermined pin and a grounding pin. The control switch receives a control signal to determine whether a predetermined current flows through the corresponding electrical fuse and breaks the electrical fuse. The resistant device is coupled between a bulk terminal and a source terminal to increase a resistance of a parasitic channel, such that an electrostatic discharge (ESD) protection is enhanced, and errors of final test trimming of an IC chip are avoided. | 05-09-2013 |
20140055178 | ADAPTIVE PHASE-SHIFTED SYNCHRONIZATION CLOCK GENERATION CIRCUIT AND METHOD FOR GENERATING PHASE-SHIFTED SYNCHRONIZATION CLOCK - The present invention discloses an adaptive phase-shifted synchronization clock generation circuit and a method for generating phase-shifted synchronization clock. The adaptive phase-shifted synchronization clock generation circuit includes: a current source generating a current which flows through a node to generate a node voltage on the node; a reverse-proportional voltage generator coupled to the node for generating a voltage which is reverse-proportional to the node voltage; a ramp generator receiving a synchronization input signal and generating a ramp signal; a comparator comparing the reverse-proportional voltage to the ramp signal; and a pulse generator for generating a clock signal according to an output from the comparator. | 02-27-2014 |
20150069940 | MULTI-PHASE MOTOR CONTROL METHOD AND DEVICE USING THE SAME - A multi-phase motor control method controls a multi-phase motor which includes multiple nodes respectively receiving a corresponding number of driving voltage signals to control a rotation of a rotor. The motor control method includes: sensing a signal phase of a current signal corresponding to at least one node, for example by sensing a zero-crossing point of the current signal; determining a reference phase for the current signal; calculating a phase difference between the signal phase and the reference phase; and controlling a phase switching frequency of the stator according to the phase difference, such that the signal phase is close to or in phase with the reference phase, to thereby obtain an optimum rotation speed of the rotor corresponding to a given driving voltage. The present invention also provides a multi-phase motor control device using the motor control method. | 03-12-2015 |