Patents Assigned to Monolithic Power Systems
  • SAMPLE AND HOLD CIRCUIT AND THE METHOD THEREOF
    Publication number: 20130002461
    Abstract: A sample and hold circuit and the method thereof are disclosed. The sample and hold circuit may be applied in voltage regulators or other circuits. The sample and hold circuit comprises: an input terminal configured to receive an input signal; an output terminal configured to provide an output signal; a control circuit configured to receive the input signal and the output signal, and wherein based on the input signal and the output signal, the control circuit generates a digital signal, and wherein the digital signal increases when the output signal is lower than the input signal, and maintains when the output signal is larger than or equal to the input signal; a digital-to-analog converter (DAC) configured to convert the digital signal to the output signal.
    Type: Application
    Filed: June 29, 2012
    Publication date: January 3, 2013
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Yike Li, Xiaoyu Xi, Fei Wang, Zhengxin Li
  • CONSTANT ON-TIME CONVERTER AND CONTROL METHOD THEREOF
    Publication number: 20130002223
    Abstract: A constant ON-time converter is disclosed. The constant ON-time converter comprises a feedback circuit, a slope compensation circuit and a buffer circuit. The feedback signal comprises an output configured to provide a feedback signal indicating an output voltage of the constant ON-time converter. The slope compensation circuit comprises an output configured to provide a slope compensation signal. The buffer circuit is coupled between the output of the feedback circuit and the output of the slope compensation circuit to avoid the feedback signal and the output voltage of the constant ON-time converter is influenced by the slope compensation signal.
    Type: Application
    Filed: June 29, 2012
    Publication date: January 3, 2013
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Xiaoyu Xi
  • PSEUDO CONSTANT ON TIME CONTROL CIRCUIT AND STEP-DOWN REGULATOR
    Publication number: 20130002221
    Abstract: A step-down regulator comprising a pseudo constant on time control circuit is disclosed, comprising an on-time generator configured to receive a switching signal provided by the step-down regulator and a control signal provided by the pseudo constant on time control circuit, and generates an on-time signal; a feedback control circuit configured to receive a feedback signal representative of the output voltage of the step-down regulator and generate an output signal; and a logic control circuit coupled to the on-time generator and the feedback control circuit to receive the on-time signal and the output signal and generating the control signal, and a power stage configured to receive an input voltage and the control signal and generate the switching signal.
    Type: Application
    Filed: June 29, 2012
    Publication date: January 3, 2013
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Rui Wang, Zhengwei Zhang
  • CURRENT CONTROL CIRCUIT AND ASSOCIATED METHOD
    Publication number: 20120326615
    Abstract: A current control circuit and associated method are disclosed hereby. The current control circuit has a fly-wheel circuit, comprising an inductor, a rectifier and a load; a current sense circuit, detecting a load current, configured to generate a first current signal; a compensating circuit, generating a compensating signal; a control circuit, generating a control signal according to the first current signal and the compensating signal; a first switch, coupled to the fly-wheel circuit, turned ON and OFF according to the control signal. By the effect of the compensating signal, the drift error of the average load current is prohibited.
    Type: Application
    Filed: June 21, 2012
    Publication date: December 27, 2012
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Taofeng Li
  • SWITCHING MODE POWER SUPPLY WITH SYNCHRONOUS RECTIFYING CONTROL CIRCUIT
    Publication number: 20120300520
    Abstract: A switching mode power supply comprising a synchronous rectifying control circuit. The synchronous rectifying control circuit comprising an integrating circuit, a first comparison circuit and a logic circuit. The integrating circuit is configured to provide an integrating signal. The first comparison circuit comprises a first input coupled to the output of the integrating signal, a second input configured to receive a first threshold signal, and an output. The logic circuit comprises a first input coupled to the output of the first comparison circuit and an output coupled to a control terminal of the secondary switch, and the secondary switch is configured to be turned OFF when the integrating signal is less then the first threshold signal.
    Type: Application
    Filed: May 23, 2012
    Publication date: November 29, 2012
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Yuancheng Ren, Lei Miao
  • Switching regulator with frequency limitation and method thereof
    Patent number: 8320139
    Abstract: A switching regulator with frequency limitation comprises a switch, a current sensing circuit, a voltage feedback circuit, a control circuit and a frequency limitation circuit. The current sensing circuit senses the current flowing through the switch and generating a current sensing signal representative of it. The voltage feedback circuit senses the output signal of the switching regulator and generates a feedback signal accordingly. The control circuit compares the current sensing signal with the feedback signal and turns off the switch based on the comparison result. The frequency limitation circuit is electrically coupled to the control circuit to limit the switching frequency of the switch.
    Type: Grant
    Filed: April 16, 2010
    Date of Patent: November 27, 2012
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Jin Hu, James C. Moyer, Junming Zhang, Yuancheng Ren
  • BRIDGELESS PFC CONVERTER AND THE METHOD THEREOF
    Publication number: 20120293141
    Abstract: A bridgeless PFC (power factor correction) converter with improved efficiency is disclosed. The bridgeless PFC converter comprises: input terminals configured to receive an input AC power supply; an output terminal configured to provide power supply; a high frequency bridge arm comprising a first switch and a third switch coupled between the output terminal and a ground node; a low frequency bridge arm comprising a second switch and a fourth switch coupled between the output terminal and the ground node; an inductor coupled between the input AC power supply and the high frequency bridge arm; and a control circuit configured to control the switching of switches in the high frequency bridge arm and the low frequency bridge arm.
    Type: Application
    Filed: May 17, 2012
    Publication date: November 22, 2012
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Bo Zhang, Yuancheng Ren, Junming Zhang, James C. Moyer, Eric Yang
  • Controller for switching power supply
    Patent number: 8315072
    Abstract: A switching power supply has an inductor that includes a coil. A chopper circuit chops the primary current drawn through the coil, for the inductor to output an induced current. A multifunction junction of the power supply has a multifunction voltage that is a function of a primary voltage that drives the coil. A first circuit suspends the chopping in response to a first sensed voltage crossing a first threshold, the first sensed voltage being a function of the multifunction voltage. A second circuit suspends the chopping in response to a second sensed voltage crossing a second threshold, the second threshold being a function of the multifunction voltage.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: November 20, 2012
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Huanyu Lu, En Li
  • SWITCH MODE POWER SUPPLY AND CONTROL METHOD THEREOF
    Publication number: 20120287682
    Abstract: In one embodiment, a switch mode power supply comprising a switch and a control circuit is disclosed. The control circuit may comprise a multi-function pin configured to receive a first current sampling signal and a first voltage sampling signal. A first comparing signal may be provided by comparing the first voltage sampling signal with a first threshold signal when the switch is turned OFF, and a second comparing signal may be provided by comparing the first current sampling signal with a second threshold signal when the switch is turned ON. The control circuit may be configured to control the switch in accordance with the first comparing signal and the second comparing signal.
    Type: Application
    Filed: May 10, 2012
    Publication date: November 15, 2012
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Yongliang Zhang, Xiaoyu Xi, Jiali Cai
  • High-voltage LED drive scheme with partial power regulation
    Patent number: 8310165
    Abstract: A high-voltage LED drive scheme with multi-stage power regulation. The multi-stage power regulation applies two components of voltage to drive the LED strings. This scheme achieves high efficiency, small size and low cost.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: November 13, 2012
    Assignee: Monolithic Power Systems, Inc.
    Inventor: Kaiwei Yao
  • TRENCH-GATE MOSFET DEVICE AND METHOD FOR MAKING THE SAME
    Publication number: 20120280311
    Abstract: The embodiments of the present disclosure disclose a trench-gate MOSFET device and the method for making the trench-gate MOSFET device. The trench-gate MOSFET device comprises a curving dopant profile formed between the body region and the epitaxial layer so that the portion of the body region under the source metal contact has a smaller vertical thickness than the other portion of the body region. The trench-gate MOSFET device in accordance with the embodiments of the present disclosure has improved UIS capability compared with the traditional trench-gate MOSFET device.
    Type: Application
    Filed: May 2, 2012
    Publication date: November 8, 2012
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Lei Zhang, Donald R. Disney, Tiesheng Li, Rongyao Ma
  • Vertical discrete devices with trench contacts and associated methods of manufacturing
    Patent number: 8304825
    Abstract: The present technology is related generally to vertical discrete devices with a trench at the topside of the vertical discrete devices. The trench is filled with a conducting material. In this approach, a drain or cathode of the vertical discrete devices is electrically connected to the topside to result in a small area with low RON*AREA.
    Type: Grant
    Filed: September 22, 2010
    Date of Patent: November 6, 2012
    Assignee: Monolithic Power Systems, Inc.
    Inventor: Martin E. Garnett
  • MULTIPHASE CONVERTER WITH CONTROLLABLE PHASE SHIFT
    Publication number: 20120274293
    Abstract: In one embodiment, a multiphase converter is disclosed. The multiphase converter may comprise a plurality of phase circuits and a plurality of phase control circuits. Each phase circuit may comprise a switch having a control terminal, and the control terminal of the switch may be configured to receive a drive signal. Each phase control circuit may be corresponding to one of the phase circuits, and each phase control circuit may be configured to provide a phase control signal to adjust an ON-time period or a reference signal for the corresponding phase circuit. The phase control signal may be responsive to the drive signal of the corresponding phase circuit.
    Type: Application
    Filed: April 27, 2012
    Publication date: November 1, 2012
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Yuancheng Ren, Eric Yang, Qian Ouyang, Xiaoming Li
  • DRIVE AND CONTROL CIRCUIT FOR MOTOR SYSTEM AND THE METHOD THEREOF
    Publication number: 20120274247
    Abstract: A drive and control circuit for motor system and the method thereof are disclosed. The motor system could be applied in a cooling device, wherein the motor system comprises a rotor, a coil and a bridge circuit. The drive and control circuit comprises a control unit, a state detecting circuit, a load determining circuit, and a startup setting circuit. The startup setting circuit makes the motor run with the maximum torque, thus to make the motor system start up easily and quickly. The load determining circuit detects the load of the motor system, thus to generate a load determining signal to determine the speed of the motor system. The control unit could be realized with few components so as to save the costs.
    Type: Application
    Filed: April 27, 2012
    Publication date: November 1, 2012
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Jian Zhao, Yike Li, Yangwei Yu
  • SWITCH-MODE POWER SUPPLY CONTROLLER AND ASSOCIATED METHOD
    Publication number: 20120275199
    Abstract: One embodiment of the present invention discloses a switch-mode power supply controller and associated method. In an embodiment, the controller comprises an on-time controller, an off-time controller, a switch control signal generator, and a jittering signal generator, wherein the jittering signal generator couples jitter into the on-time or the off-time of a primary switch of the power supply. Therefore the EMI performance may be improved.
    Type: Application
    Filed: April 27, 2012
    Publication date: November 1, 2012
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Yike Li, Xiangyong Xu
  • Power converters and methods for converting an input signal to an output voltage
    Patent number: 8289007
    Abstract: Power converters and associated methods of operation are disclosed herein. In one embodiment, a power converter includes a first switch and a second switch electrically coupled to the first switch in series. The first switch is electrically coupled to a first node and to a second node via the second switch. The power converter further includes a capacitor and a third switch electrically coupled to the first node and to the second node via the capacitor and the second switch. The third switch has a linear-active region of operation.
    Type: Grant
    Filed: July 27, 2009
    Date of Patent: October 16, 2012
    Assignee: Monolithic Power Systems, Inc.
    Inventor: Qian Ouyang
  • Microelectronic packages with enhanced heat dissipation and methods of manufacturing
    Patent number: 8283758
    Abstract: Several embodiments of microelectronic packages with enhanced heat dissipation and associated methods of manufacturing are disclosed herein. In one embodiment, a microelectronic package includes a semiconductor die having a first side and a second side opposite the first side and a lead frame proximate the semiconductor die. The lead frame has a lead finger electrically coupled to the first side of the semiconductor die. The microelectronic package also includes an encapsulant at least partially encapsulating the semiconductor die and the lead frame. The encapsulant does not cover at least a portion of the second side of the semiconductor die.
    Type: Grant
    Filed: December 16, 2010
    Date of Patent: October 9, 2012
    Assignee: Monolithic Power Systems, Inc.
    Inventor: Hunt Hang Jiang
  • BALLAST AND ASSOCIATED CONTROL CIRCUIT
    Publication number: 20120248984
    Abstract: The embodiments of the present invention disclose a ballast and associated control circuit wherein the control circuit comprises a multi function pin, a preheat cut-off circuit and an over-voltage protection circuit, wherein the multi function pin is coupled to the preheat cut-off circuit and a first switch configured to turn on the first switch at a preheat state of the ballast and to turn off the first switch at the end of the preheat state, and wherein the multi function pin is further coupled to the over-voltage protection circuit and a voltage sense circuit configured to receive a sensed output voltage signal and to stop the ballast after the preheat state when the sensed output voltage is larger than a first threshold. Compared with prior art, the present invention may reduce the volume and lower down the cost of circuit.
    Type: Application
    Filed: March 29, 2012
    Publication date: October 4, 2012
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Jin Hu, Yuancheng Ren, Junming Zhang
  • LDMOS DEVICE AND METHOD FOR MAKING THE SAME
    Publication number: 20120241862
    Abstract: The embodiments of the present disclosure disclose a LDMOS device and the method for making the LDMOS device. The LDMOS device comprises at least one capacitive region formed in the drift region. Each capacitive region comprises a polysilicon layer and a thick oxide layer separating the polysilicon layer from the drift region. The LDMOS device in accordance with the embodiments of the present disclosure can improve the breakdown voltage while a low on-resistance is maintained.
    Type: Application
    Filed: March 22, 2012
    Publication date: September 27, 2012
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Lei Zhang, Yang Xiang
  • Switching mode power supply with burst mode and associated methods of control
    Patent number: 8274801
    Abstract: Switching mode power supplies (SMPS) that can operate in a control mode for a normal load condition and operate with a burst-mode controller for a light load condition are disclosed herein. In one embodiment, a method for controlling the switching mode power supply includes when the load is in a light load condition, the switching mode power supply is controlled by a burst-mode controller.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: September 25, 2012
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Yang Shi, Junming Zhang, Yuancheng Ren