TRENCH-GATE MOSFET DEVICE AND METHOD FOR MAKING THE SAME
Granted: November 8, 2012
Application Number:
20120280311
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…
SWITCH-MODE POWER SUPPLY CONTROLLER AND ASSOCIATED METHOD
Granted: November 1, 2012
Application Number:
20120275199
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.
MULTIPHASE CONVERTER WITH CONTROLLABLE PHASE SHIFT
Granted: November 1, 2012
Application Number:
20120274293
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…
DRIVE AND CONTROL CIRCUIT FOR MOTOR SYSTEM AND THE METHOD THEREOF
Granted: November 1, 2012
Application Number:
20120274247
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…
BALLAST AND ASSOCIATED CONTROL CIRCUIT
Granted: October 4, 2012
Application Number:
20120248984
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…
LDMOS DEVICE AND METHOD FOR MAKING THE SAME
Granted: September 27, 2012
Application Number:
20120241862
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.
SELF-ALIGNED CONTACT STRUCTURE TRENCH JFET
Granted: May 3, 2012
Application Number:
20120104467
According to one embodiment, a self-aligned trench structure junction gate field-effect transistor (JFET) includes a silicon substrate, two or more trenches having a P-type polysilicon gate region near a bottom portion of the trench and an interlayer dielectric layer (ILDL) above the P-type polysilicon gate region, a channel region separating each trench including epitaxial silicon, an N+ source region above the channel region extending between a top of each trench, and a source metal…
VOLTAGE CONVERTER
Granted: October 6, 2011
Application Number:
20110241642
A voltage converter includes an input circuit that is designed to receive an input voltage. The voltage converter includes a switch circuit comprising a pair of switches that receive the input voltage through the input circuit. The voltage converter includes an output circuit configured to supply current at a regulated voltage. The voltage converter includes a feedback circuit that generates a feedback signal. The voltage converter includes a switch control circuit that generates a…
LOW LEAKAGE AND/OR LOW TURN-ON VOLTAGE SCHOTTKY DIODE
Granted: June 30, 2011
Application Number:
20110156199
A Schottky diode and a method of manufacturing the Schottky diode are disclosed. The Schottky diode has an N-well or N-epitaxial layer with a first region, a second region substantially adjacent to an electron doped buried layer that has a donor electron concentration greater than that of the first region, and a third region substantially adjacent to the anode that has a donor electron concentration that is less than that of the first region. The second region may be doped with implanted…
PULSE DIMMING CIRCUIT AND THE METHOD THEREOF
Granted: May 13, 2010
Application Number:
20100117555
The present invention provides a pulse dimming circuit and a method thereof. The pulse dimming circuit is compatible for both DC input signal and PWM input signal using only one circuit board.
CHARGE PUMP FOR SWITCHED CAPACITOR CIRCUITS WITH SLEW-RATE CONTROL OF IN-RUSH CURRENT
Granted: December 17, 2009
Application Number:
20090309633
A ramp-up circuit for switched capacitor circuits with negative feedback to control the slew rate of in-rush current. Other embodiments are described and claimed.
METHOD AND APPARATUS FOR SYNCHRONOUS BOOST VOLTAGE REGULATORS WITH ACTIVE NEGATIVE CURRENT MODULATION
Granted: October 1, 2009
Application Number:
20090243568
A switch-mode synchronous boost voltage regulator is disclosed that includes a boost voltage regulator and an active current modulator. The active current modulator detects a negative current flowing through the high-side switch during a light load condition. When the negative current is detected, the active current modulator is operable to maintain the high-side switch “on” in a linear mode and to limit the negative current to a predetermined current level.
METHOD AND APPARATUS FOR SYNCHRONOUS BUCK WITH ACTIVE NEGATIVE CURRENT MODULATION
Granted: October 1, 2009
Application Number:
20090243569
A circuit is disclosed that includes a buck voltage regulator electrically coupled to an active current modulator. The active current modulator is operable to detect a negative current in the low-side switch of the buck voltage regulator circuit during a light mode operation. Whenever the negative current is detected, the active negative current modulator causes the low-side switch to stay ON in a linear mode and limits the negative current to a predetermined current level.
METHOD AND APPARATUS FOR EXTERNAL CONTROL MODE STEP DOWN SWITCHING REGULATOR
Granted: June 18, 2009
Application Number:
20090153127
A switching regulator integrated circuit (IC) is disclosed that includes a switch circuit that further includes a first switch and a second switch, a mode selector circuit controlled by external circuitry to select between a first mode and a second mode, and a control circuit. In response to a feedback signal from the switch circuit, when the first mode is selected, the control circuit toggles the first switch and the second switch ON and OFF alternately at a fixed first frequency. When…
SIMPLE PROTECTION CIRCUIT AND ADAPTIVE FREQUENCY SWEEPING METHOD FOR CCFL INVERTER
Granted: June 4, 2009
Application Number:
20090140655
A CCFL inverter circuit integrates a feedback circuit and protection circuit together. For both in-phase and out-of-phase applications, sensed lamp voltages can be used for open lamp and short lamp detection and sensed currents can be used for open lamp detection. The driving circuit adjusts the open lamp frequency by using a duty cycle control signal so that the driving circuit can always achieve the desired lamp voltage gain.
METHOD AND APPARATUS FOR HIGH PERFORMANCE SWITCH MODE VOLTAGE REGULATORS
Granted: April 16, 2009
Application Number:
20090096511
A circuit configuration for a high power switch-mode voltage regulator circuit is disclosed that includes an array of Metal Oxide Semiconductor (MOS) switching transistors electrically coupled to one another at their drains and sources, and a plurality of gate driver circuits. Each gate driver circuit is coupled substantially close to the gate and dedicated to driving only one MOS switching transistor.
LAYOUT SCHEMES AND APPARATUS FOR HIGH PERFORMANCE DC-DC OUTPUT STAGE
Granted: April 16, 2009
Application Number:
20090096435
A layout method that enables a high power switch mode voltage regulator integrated circuit to generate a large output current and achieve substantially low switching loss is disclosed. The layout method includes forming an array of switching elements on a semiconductor die, each switching element including a plurality of discrete transistors configured to have a substantially reduced ON resistance; and forming a plurality of gate driver circuits on the same die among the switching…
METHOD AND SYSTEM FOR OPEN LAMP PROTECTION
Granted: October 23, 2008
Application Number:
20080258651
A detector circuit monitors the phase relationship between the lamp voltage and the excitation voltage, and if one or more conditions are met, triggers the open lamp protection process in a discharge lamp system. The detection circuit can be incorporated into a lamp voltage feedback circuit and implemented on the integrated circuit level with less cost and circuit complexity.
Method and apparatus for overshoot and undershoot errors correction in analog low dropout regulators
Granted: July 31, 2008
Application Number:
20080180071
The present invention provides a method and apparatus for dynamically correcting overshoot and undershoot errors in an analog integrated circuit by improving the reaction time (?t) of the analog integrated circuit. Equivalently, an error correction circuit is disclosed including an overshoot correction circuit and an undershoot correction that are only activated to reduce overshoot and undershoot errors by increasing the bandwidth of the integrated circuit when either undershoot or…
SINGLE-ENDED DC TO AC POWER INVERTER
Granted: July 24, 2008
Application Number:
20080174251
An inverter comprising a low-side switching element in series with a first primary winding; a high-side switching element in series with a second primary winding, where the combination of the low-side switching element and first primary winding is connected in parallel with the combination of the high-side switching element and the second primary winding; and a clamping capacitor having one terminal connected to the first primary winding and having a second terminal connected to the…
