LDMOS device with short channel and associated fabrication method
Granted: July 21, 2015
Patent Number:
9087774
A method of fabricating an LDMOS device includes: forming a gate of the LDMOS device on a semiconductor substrate; performing tilt body implantation by implanting dopants of a first conductivity type in the semiconductor substrate using a mask, wherein the tilt body implantation is implanted at an angle from a vertical direction; performing zero tilt body implantation by implanting dopants of the first conductivity type using the same mask, wherein the zero tilt body implantation is…
Switching power supply with optimized THD and control method thereof
Granted: July 14, 2015
Patent Number:
9083245
A switching power supply comprising a switching circuit and a controller. The controller comprises a preprocessing circuit, a first multiplier, a first comparing circuit and a logic circuit. The controller comprises a preprocessing circuit, a first multiplier, a first comparing circuit and a logic circuit. The preprocessing circuit generates a first multiplication input signal based on the input voltage and output voltage of the switching circuit. The first multiplier multiplies the…
Constant on time multi-phase switching converter and control method thereof
Granted: July 14, 2015
Patent Number:
9081397
A multi-phase switching converter comprising a plurality of switching circuits, a comparing circuit and a control circuit. The comparing circuit generates a comparison signal based on a reference signal and the output voltage of the multi-phase switching converter. The control circuit can turn on the following switching circuit based on the comparison signal only after the time from the current switching circuit being turned on reaches a first time threshold or the off-time of the…
Multi-phase SMPS with load transient control and associated control method
Granted: June 30, 2015
Patent Number:
9071142
The present invention discloses a multi-phase switch-mode power supply (SMPS). The multi-phase SMPS may comprise a plurality of comparing circuits and a controller. Wherein each comparing circuit comprises a first input coupled to a threshold voltage, a second input coupled to a feedback signal of the output voltage, and an output configured to provide a load indication signal. The controller may have a plurality of inputs coupled to the outputs of the comparing circuit, and a plurality…
Microelectronic flip chip packages with solder wetting pads and associated methods of manufacturing
Granted: June 30, 2015
Patent Number:
9070671
Processes of assembling microelectronic packages with lead frames and/or other suitable substrates are described herein. In one embodiment, a method for fabricating a semiconductor assembly includes forming an attachment area and a non-attachment area on a lead finger of a lead frame. The attachment area is more wettable to the solder ball than the non-attachment area during reflow. The method also includes contacting a solder ball carried by a semiconductor die with the attachment area…
Isolated switching mode power supply and the method thereof
Granted: June 23, 2015
Patent Number:
9065348
An isolated switching mode power supply, having: a transformer having a primary winding, a secondary winding and a third winding; a current limit comparator configured to provide a current limit signal based on the current sense signal and the peak current signal; a logic circuit configured to provide a logic control signal based on the frequency control signal and the current limit signal; a startup control circuit configured to generate a startup control signal based on the current…
Class D audio amplifier with noise suppression and the method thereof
Granted: June 16, 2015
Patent Number:
9059667
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…
Energy harvest system and the method thereof
Granted: June 16, 2015
Patent Number:
9059633
The present disclosure discloses an energy harvest system converting an AC source provided by an energy harvester to a desired voltage. The AC source is boosted to the desired voltage by a bi-directional booster converter comprising fourth controllable transistors configured in an H-bridge, and stored by a storage capacitor. The desired voltage is then used to power various loads.
Power device with integrated Schottky diode and method for making the same
Granted: June 16, 2015
Patent Number:
9059329
The present invention discloses a power device with integrated power transistor and Schottky diode and a method for making the same. The power device comprises a power transistor having a drain region, a Schottky diode in the drain region of the power transistor, and a trench-barrier near the Schottky diode. The trench-barrier is provided to reduce a reverse leakage current of the Schottky diode and minimizes the possibility of introducing undesired parasitic bipolar junction transistor…
Pseudo constant on time control circuit and step-down regulator
Granted: May 26, 2015
Patent Number:
9041377
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…
Constant on-time switching converters with sleep mode and control methods thereof
Granted: May 26, 2015
Patent Number:
9041373
A constant on-time switching converter includes a switching circuit, an on-time control circuit, a comparing circuit and a logic circuit. The switching circuit has a first switch and is configured to provide an output voltage to a load. The on-time control circuit generates an on-time control signal to control the on-time of the first switch. The comparing circuit compares the output voltage of the switching circuit with a reference signal and generates a comparison signal. The logic…
Current control circuit and associated method
Granted: May 26, 2015
Patent Number:
9041304
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,…
Power transistor and associated method for manufacturing
Granted: May 26, 2015
Patent Number:
9041102
The present disclosure discloses a lateral transistor and associated method for making the same. The lateral transistor comprises a gate formed over a first portion of a thin gate dielectric layer, and a field plate formed over a thick field dielectric layer and extending atop a second portion of the thin gate dielectric layer. The field plate is electrically isolated from the gate by a gap overlying a third portion of the thin gate dielectric layer and is electrically coupled to a…
High efficient control circuit for buck-boost converters and control method thereof
Granted: May 19, 2015
Patent Number:
9035640
A controller used in a buck-boost converter includes a clock generator, an error amplifying circuit, a comparing circuit, a proportional sampling circuit, a logic circuit, a pulse width increasing circuit, first and second driving circuits. Based on a clock signal generated by the clock generator, the proportional sampling circuit samples the difference between a current sensing signal and a compensation signal generated by the error amplifying circuit, and generates a proportional…
Light emitting diode driver systems and associated methods of control
Granted: May 19, 2015
Patent Number:
9035566
Light emitting diode (LED) dimming and driver systems and associated methods of control are disclosed herein. In one embodiment, a system comprises a PFC stage and an LED driver stage. The LED driver stage comprises an isolated converter and a controller responsive to a dimming signal to dim LED strings for backlight. The controller also regulates an output current of the isolated converter.
Methods for driving an LED lighting device and circuits thereof
Granted: April 21, 2015
Patent Number:
9013120
A method for driving an LED lighting device includes receiving an input voltage from a battery unit and converting the input voltage into a driving current to drive the LED lighting device. The method further includes detecting whether the battery unit is in a low battery state. When the low battery state of the battery unit is detected, the driving current is reduced.
Light emitting element driving circuit
Granted: March 17, 2015
Patent Number:
8981666
The present disclosure discloses a light emitting element driving circuit. In one embodiment the light emitting element driving circuit may comprise a power conversion circuit and a current balancing circuit. In other embodiment the light emitting element driving circuit may further comprise other modules integrated and interacting with the power conversion circuit and the current balancing circuit, such as fault detection and protection circuits, status indication circuits and…
Switching mode power supply with synchronous rectifying control circuit
Granted: March 10, 2015
Patent Number:
8976547
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…
ESD protection structure and semiconductor device comprising the same
Granted: March 3, 2015
Patent Number:
8969968
An ESD protection structure and a semiconductor device having an ESD protection structure with the ESD protection structure including a patterned conductive ESD protection layer. The ESD protection layer is patterned to have a first portion of a substantially closed ring shape having an outer contour line and an inner contour line parallel with each other. The outer and the inner contour lines are waved lines. The first portion further has a midline between and parallel with the outer…
LED driver and the method thereof
Granted: March 3, 2015
Patent Number:
8970122
A LED driver comprising: a power switch; a transformer comprising a primary winding coupled to the power switch, a secondary winding and a third winding; a current sense circuit configured to sense a current flowing through the power switch and generates a current sense signal; a zero cross detecting circuit configured to detect a current flowing through the secondary winding, and generates a zero cross detecting signal; a compensation circuit configured to compensate the current sense…
