Patents Assigned to Monolithic Power Systems
  • ISOLATED SWITCHING MODE POWER SUPPLY AND THE METHOD THEREOF
    Publication number: 20130301310
    Abstract: An isolated switching mode power supply, having: an input terminal; an output terminal; a transformer having a primary winding and a secondary winding; a primary power switch coupled to the primary winding; a secondary power switch coupled between the secondary winding and the output terminal of the power supply; a secondary controller configured to generate a frequency modulation signal based on the output voltage and the first feedback signal; a coupled device configured to provide a frequency control signal based on the output voltage and the frequency modulation signal; and a primary controller configured to provide a switching signal to control the primary power switch based on the current sense signal and the frequency control signal.
    Type: Application
    Filed: May 7, 2013
    Publication date: November 14, 2013
    Applicant: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Siran Wang, Junming Zhang, Yuancheng Ren
  • SWITCHING MODE POWER SUPPLY AND THE METHOD THEREOF
    Publication number: 20130301311
    Abstract: A switching mode power supply, having: an input port; an output port; an energy storage component and a pair of power switches coupled between input port and the output port; an error amplifier configured to generate an amplified error signal based on the feedback signal and the reference signal; an error comparator configured to generate a frequency control signal based on the amplified error signal and the first sawtooth signal; a peak current generator configured to generate a peak current signal based on the frequency control signal; a peak current comparator configured to generate a current limit signal based on the peak current signal and the current sense signal; and a logic circuit configured to generate a switching signal to control the power switches based on the frequency control signal and the current limit signal.
    Type: Application
    Filed: May 7, 2013
    Publication date: November 14, 2013
    Applicant: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
  • Triac dimmer compatible switching mode power supply and method thereof
    Patent number: 8581518
    Abstract: Triac dimmer compatible switching mode power supplies used as LED drivers are disclosed herein. A PFC controller is configured in the switching mode power supplies. With the PFC controller, the current keeping the triac in the on-state is supplied by the DC/DC converter, and the LC resonance is reduced.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: November 12, 2013
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Naixing Kuang, Lei Du, Junming Zhang, Yuancheng Ren
  • Bipolar junction transistor with layout controlled base and associated methods of manufacturing
    Patent number: 8581365
    Abstract: The present technology discloses a bipolar junction transistor (BJT) device integrated into a semiconductor substrate. The BJT device comprises a collector, a base and an emitter. The collector is of a first doping type on the substrate; the base is of a second doping type in the collector from the top surface of the semiconductor device and the base has a base depth; and the emitter is of a first doping type in the base from the top surface of the semiconductor device. The base depth is controlled by adjusting a layout width in forming the base.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: November 12, 2013
    Assignee: Monolithic Power Systems, Inc.
    Inventor: Jeesung Jung
  • LIGHT EMITTING ELEMENT DRIVING CIRCUITS WITH DIMMING FUNCTION AND CONTROL METHODS THEREOF
    Publication number: 20130293154
    Abstract: A controller used in a light emitting element driving circuit, wherein the light emitting element driving circuit has a power converter configured to provide an output current for the light emitting element. The controller has a dimming processing unit and a current control unit. The dimming processing unit is configured to receive a first dimming signal with a first duty cycle and a second dimming signal with a second duty cycle, and to generate a second dimming processing signal relative to the product of the first duty cycle and the second duty cycle. The current control unit is coupled between the dimming processing unit and the power converter, and is configured to generate a control signal for the power converter based on the second dimming processing signal and a feedback signal indicating the output current.
    Type: Application
    Filed: May 2, 2013
    Publication date: November 7, 2013
    Applicant: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Naixing Kuang, Zhijun Ye, Kun Yi, Bo Yu
  • Switching mode power supply with primary side control
    Patent number: 8576588
    Abstract: The present technology are directed to switching mode power supplies with primary side control. In one embodiment, the switching mode power supply provides an equivalent current signal which represents a load current. The equivalent current signal is then used to control a switching circuit in the switching mode power supply.
    Type: Grant
    Filed: January 28, 2011
    Date of Patent: November 5, 2013
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Naixing Kuang, Lei Du, Junming Zhang, Yuancheng Ren
  • HIGH VOLTAGE SWITCHING DEVICE THE METHOD FOR FORMING THEREOF
    Publication number: 20130277755
    Abstract: A high voltage switching device and associated method of manufacturing, the high voltage switching device having a substrate, an epitaxial layer, a source region, a drain region, a drift region, a gate oxide, a filed oxide, a gate and a snake shaped poly.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 24, 2013
    Applicant: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: Kun Yi
  • CLASS D AUDIO AMPLIFIER WITH NOISE SUPPRESSION AND THE METHOD THEREOF
    Publication number: 20130271215
    Abstract: A class D audio amplifier having: an audio control circuit configured to provide a switching signal based on an input signal and a reference signal; an input capacitor coupled between the input signal and the first input terminal of the audio control circuit; an inductor having a first terminal coupled to the switching terminal of the audio control circuit, and a second terminal; an output capacitor having a first terminal coupled to second terminal of the inductor and a second terminal coupled to a load; and a noise suppression circuit having a first terminal coupled to the first input terminal of the audio control circuit, and a second terminal coupled to the switching terminal of the audio control circuit, wherein the noise suppression circuit charges the input capacitor and the output capacitor to reach a preset value.
    Type: Application
    Filed: April 5, 2013
    Publication date: October 17, 2013
    Applicant: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Yunping Lang, Li Lian
  • DELAY CIRCUIT AND ASSOCIATED METHOD
    Publication number: 20130257502
    Abstract: The embodiments of the present invention disclose a delay circuit. The delay circuit comprises an inverter, a load capacitor, and a first voltage clamping module, wherein the first voltage clamping module generates a voltage drop configured to prolong the propagation delay time of the delay circuit as the power supply voltage decreases. The power supply dependent delay circuit may have a much larger propagation delay time at low power supply voltage than it at high power supply voltage at the rising-edge or falling-edge of an input signal.
    Type: Application
    Filed: March 27, 2012
    Publication date: October 3, 2013
    Applicant: Monolithic Power Systems, Inc.
    Inventors: Yan Dong, Peng Xu
  • CONSTANT ON-TIME SWITCHING CONVERTER AND CONTROL METHOD THEREOF
    Publication number: 20130257399
    Abstract: A controller used in a switching converter. The switching converter includes a switching circuit having at least one switch. The controller comprises an on-time control circuit generating an on-time control signal, a slope compensation circuit generating a slope compensation signal, a comparing circuit, a logic circuit and a load detection circuit. The comparing circuit generates a comparison signal based on the slope compensation signal, a reference signal and the output voltage of the switching circuit. The logic circuit generates a control signal to control the ON and OFF switching of the at least one switch based on the on-time control signal and the comparison signal. The load detection circuit detects the load condition. The slope compensation circuit adjusts the slope compensation signal based on the load condition.
    Type: Application
    Filed: December 5, 2012
    Publication date: October 3, 2013
    Applicant: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: Chengdu Monolithic Power Systems Co., Ltd.
  • High density lateral DMOS with recessed source contact
    Patent number: 8546879
    Abstract: The present disclosure discloses a lateral DMOS with recessed source contact and method for making the same. The lateral DMOS comprises a recessed source contact which has a portion recessed into a source region to reach a body region of the lateral DMOS. The lateral DMOS according to various embodiments of the present invention may have greatly reduced size and may be cost saving for fabrication.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: October 1, 2013
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Donald R. Disney, Lei Zhang, Tiesheng Li
  • Low loss discharge circuits for EMI filter capacitors
    Patent number: 8541987
    Abstract: A discharge circuit for an EMI filter capacitor includes normally-ON transistors. The normally-ON transistors may be controlled to limit current through them when an AC source is coupled across the discharge circuit. When the AC source is disconnected from the discharge circuit, the normally-ON transistors turn ON to allow current flow through them. The current flow allows the EMI filter capacitor to be discharged by a discharge resistor.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: September 24, 2013
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Donald R. Disney, Michael Hsing, James Nguyen, James Moyer
  • DISCHARGE CIRCUITS FOR EMI FILTERS CAPACITORS AND METHODS THEREOF
    Publication number: 20130242626
    Abstract: A discharge circuit for an EMI filter capacitor, wherein the EMI filter capacitor is coupled between input terminals of a switching converter. The discharge circuit has a detecting circuit and a current source. The detecting circuit is configured to detect whether an electrical source is coupled to the input terminals of the switching converter. The current source is coupled between the input terminals of the switching converter and a power supply capacitor, and is configured to provide a power supply voltage across the power supply capacitor. When the electrical source is uncoupled from the input terminals of the switching converter, the EMI filter capacitor is discharged by the current source.
    Type: Application
    Filed: March 11, 2013
    Publication date: September 19, 2013
    Applicant: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: En Li
  • SWITCHING POWER SUPPLY WITH FIXED OFF TIME MODE AND CONTROL METHOD THEREOF
    Publication number: 20130241511
    Abstract: The present invention provides a controller used in a switching power supply. The controller comprises an oscillator, a first comparison circuit and a logic circuit. The oscillator generates a slope compensation signal and a clock signal. The first comparison circuit generates a first comparison signal in accordance with a current sensing signal, a feedback signal and the slope compensation signal. The logic circuit generates a control signal to control the main switch based on the clock signal and the first compensation signal. If the on time of the main switch is longer than the predetermined time period, the slope compensation signal will have a first slew rate during the predetermined time period and a second slew rate out of the predetermined time period, wherein the second slew rate is smaller than the first slew rate.
    Type: Application
    Filed: March 27, 2012
    Publication date: September 19, 2013
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Xiaoyu Xi
  • Latch-off of synchronous rectification for light load control
    Patent number: 8537584
    Abstract: Disclosed is a light load control circuit and the method accordingly where the synchronous rectification is latched off when the light load condition is detected for several successive cycles.
    Type: Grant
    Filed: June 25, 2010
    Date of Patent: September 17, 2013
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Yuancheng Ren, Junming Zhang, Lei Miao, Zhaoqi Mao
  • SEMICONDUCTOR DEVICE AND ASSOCIATED FABRICATION METHOD
    Publication number: 20130234245
    Abstract: A super junction structural semiconductor device with a substantially rectangle-shaped first region, and a second region surrounding the periphery of the first region; trench gate MOSFET units in the first region comprising a plurality of trench gate regions and a first plurality of pillars; a body region between the trench gate regions and the first plurality of pillars; a second plurality of pillars in the second region extending along a corresponding side of the first region comprising a plurality of lateral pillars and a plurality of longitudinal pillars, wherein in a corner part of the second region, ends of the plurality of lateral pillars and ends of the plurality of longitudinal pillars are stagger and separated apart from each other.
    Type: Application
    Filed: March 6, 2013
    Publication date: September 12, 2013
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Rongyao Ma, Tiesheng Li, Donald Disney, Lei Zhang
  • Average input current limit method and apparatus thereof
    Patent number: 8525498
    Abstract: The embodiment of invention discloses an average input current limit method and apparatus thereof. The apparatus comprises a switching circuit, a current average circuit and a current limit circuit. The current average circuit samples the input current of the switching circuit and generates a signal representative of the average value of the input current. The current limit circuit limits the signal so as to limit the average value of the input current.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: September 3, 2013
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Eric Yang, Jinghai Zhou
  • Super junction device with deep trench and implant
    Patent number: 8525260
    Abstract: RESURF effect devices with both relatively deep trenches and relatively deep implants are described herein. Also, methods of fabricating such devices are described herein. A RESURF effect device may include alternating regions of first and second conductivity types where each of the second regions includes an implant region formed into a trench region of the second region.
    Type: Grant
    Filed: March 19, 2010
    Date of Patent: September 3, 2013
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Tiesheng Li, Michael R. Hsing, Deming Xiao
  • Circuitry for driving light emitting diodes and associated methods
    Patent number: 8525423
    Abstract: Circuitry and methods for driving a plurality of LED strings are disclosed herein. In one embodiment, the circuitry comprises a plurality of current regulating circuits electrically coupled to the LED strings and are configured to regulate a current flowing through the LED strings. At least two control circuits are coupled to the current regulating circuits and are configured to generate a control signal according to terminal voltages of the corresponding current regulating circuits. A voltage converter is electrically coupled to the LED strings and to the at least two control circuits, and is configured to regulate the DC driving voltage according to the at least two control signals.
    Type: Grant
    Filed: March 22, 2011
    Date of Patent: September 3, 2013
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Bo Yu, Yuancheng Ren, Lei Du, Naixing Kuang, Zhishun Li
  • High power-supply rejection ratio amplifying circuit
    Patent number: 8514024
    Abstract: The embodiments of the present invention disclose a high power-supply rejection ratio (PSRR) amplifier circuit. The amplifier circuit comprises a low dropout regulator, a negative charge pump and an amplifier. The output voltages of the negative charge pump and the low dropout regulators don't track the change of input voltage. Therefore the amplifier circuit has high PSRR.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: August 20, 2013
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Rui Wang, Jinyan Lin, Huijie Zhao, Yunping Lang