Method and apparatus providing final test and trimming for a power supply controller
Granted: May 14, 2002
Patent Number:
6388853
A power supply controller having final test and trim circuitry. In one embodiment, a power supply controller for switched mode power supply includes a selector circuit, a trim circuit, a shutdown circuit and a disable circuit. The trim circuit includes a programmable circuit connection that can be selected by the selector circuit by toggling a voltage on an external terminal such as for example a power supply terminal, a control terminal or a function terminal of the power supply…
Method and apparatus providing a multi-function terminal for a power supply controller
Granted: April 2, 2002
Patent Number:
6366481
A power supply controller having a multi-function terminal. In one embodiment, a power supply controller for switched mode power supply includes a drain terminal, a source terminal, a control terminal and a multi-function terminal. The multi-function terminal may be configured in a plurality of ways providing any one or some of a plurality of functions including on/off control, external current limit adjustments, under-voltage detection, over-voltage detection and maximum duty cycle…
Output feedback and under-voltage detection system
Granted: March 26, 2002
Patent Number:
6362981
A switched mode controller for properly handling an under-voltage condition in a power line which includes a current mirror for receiving current from the power line; a reference current source coupled to the current mirror for supplying a reference current; and a power transistor coupled to the reference current source, the power transistor generating a pulse width modulated signal when current from the power line exceeds the reference current, the power transistor being disabled when…
Method and apparatus providing a multi-function terminal for a power supply controller
Granted: March 12, 2002
Patent Number:
6356464
A power supply controller having a multi-function terminal. In one embodiment, a power supply controller for switched mode power supply includes a drain terminal, a source terminal, a control terminal and a multi-function terminal. The multi-function terminal may be configured in a plurality of ways providing any one or some of a plurality of functions including on/off control, external current limit adjustments, under-voltage detection, over-voltage detection and maximum duty cycle…
Method and apparatus providing a multi-function terminal for a power supply controller
Granted: February 26, 2002
Patent Number:
6351398
A power supply controller having a multi-function terminal. In one embodiment, a power supply controller for switched mode power supply includes a drain terminal, a source terminal, a control terminal and a multi-function terminal. The multi-function terminal may be configured in a plurality of ways providing any one or some of a plurality of functions including on/off control, external current limit adjustments, under-voltage detection, over-voltage detection and maximum duty cycle…
Fault condition protection
Granted: January 8, 2002
Patent Number:
6337788
A circuit protects a power conversion system with a feedback control loop from a fault condition. The circuit has an oscillator having an input for generating a signal with a frequency and a timer connected to the oscillator input and to the feedback control loop. The timer disables the oscillator after a period following the opening of the feedback control loop to protect the power conversion system.
Method and apparatus providing a multi-function terminal for a power supply controller
Granted: November 6, 2001
Patent Number:
6313976
A power supply controller having a multi-function terminal. In one embodiment, a power supply controller for switched mode power supply includes a drain terminal, a source terminal, a control terminal and a multi-function terminal. The multi-function terminal may be configured in a plurality of ways providing any one or some of a plurality of functions including on/off control, external current limit adjustments, under-voltage detection, over-voltage detection and maximum duty cycle…
Method and apparatus providing a multi-function terminal for a power supply controller
Granted: October 16, 2001
Patent Number:
6304462
A power supply controller having a multi-function terminal. In one embodiment, a power supply controller for switched mode power supply includes a drain terminal, a source terminal, a control terminal and a multi-function terminal. The multi-function terminal may be configured in a plurality of ways providing any one or some of a plurality of functions including on/off control, external current limit adjustments, under-voltage detection, over-voltage detection and maximum duty cycle…
Off-line converter with digital control
Granted: October 2, 2001
Patent Number:
6297623
A DC to DC converter comprising an energy storage element comprising an energy storage element input and an energy storage element output, the energy storage element input coupled to receive a first power level and the energy storage element output providing a second power level. The converter also comprises a feedback circuit comprising a feedback input and a feedback output, the feedback input coupled to the energy storage element output. The converter further comprises a regulator…
Frequency jittering control for varying the switching frequency of a power supply
Granted: June 19, 2001
Patent Number:
6249876
EMI emission is reduced by jittering the switching frequency of a switched mode power supply. An oscillator with a control input for varying the oscillator's switching frequency generates a jittered clock signal. In one embodiment, the oscillator is connected to a counter clocked by the oscillator. The counter drives a digital to analog converter, whose output is connected to the control input of the oscillator for varying the oscillation frequency. In another embodiment, the…
Switched mode power supply responsive to voltage across energy transfer element
Granted: May 15, 2001
Patent Number:
6233161
A switched mode power supply having a regulated reflected voltage. In one embodiment, a switched mode power supply includes a power supply regulator coupled between a positive input supply rail of the power supply and a primary winding of an energy transfer element. The reflected voltage across the primary winding of the transfer element is related to the output voltage across a secondary winding of the energy transfer element according to the turns ratio of the energy transfer element.…
Off-line converter with integrated softstart and frequency jitter
Granted: May 8, 2001
Patent Number:
6229366
A pulse width modulated switch comprises a first terminal, a second terminal, and a switch that allows a signal to be transmitted between the first terminal and the second terminal according to a drive signal provided at a control input. The pulse width modulated switch also comprises a frequency variation circuit that provides a frequency variation signal and an oscillator that provides an oscillation signal having a frequency of that varies within a frequency range according to the…
Off-line converter with digital control
Granted: May 1, 2001
Patent Number:
6226190
A DC to DC converter comprising an energy storage element including an energy storage element input and an energy storage element output, the energy storage element input coupled to receive a first power level and the energy storage element output providing a second power level. The converter also includes a feedback circuit having a feedback input and a feedback output, the feedback input coupled to the energy storage element output. The converter further includes a regulator circuit…
Method and apparatus for improving efficiency in a switching regulator at light loads
Granted: April 3, 2001
Patent Number:
6212079
A switching regulator that operates at a frequency for a first range of feedback signal values and at a variable frequency without skipping cycles for a second range of feedback signal values. In one embodiment, a switching regulator for a switched mode power supply includes a power switch coupled between drain and source terminals of the switching regulator, which are to be coupled to control the delivery of power to an output of a power supply. A control terminal of the switching…
High-voltage transistor with multi-layer conduction region
Granted: March 27, 2001
Patent Number:
6207994
A high voltage insulated gate field-effect transistor includes an insulated gate field-effect device structure having a source and a drain, the drain being formed with an extended well region having one or more buried layers of opposite conduction type sandwiched therein. The one or more buried layers create an associated plurality of parallel JFET conduction channels in the extended portion of the well region. The parallel JFET conduction channels provide the HVFET with a low on-state…
Method of making a high-voltage transistor with multiple lateral conduction layers
Granted: January 2, 2001
Patent Number:
6168983
A method for making a high voltage insulated gate field-effect transistor having an insulated gate field-effect device structure with a source and a drain comprises the steps of forming the drain with an extended well region having one or more buried layers of opposite conduction type sandwiched therein. The one or more buried layers create an associated plurality of parallel JFET conduction channels in the extended portion of the well region. A minimal number of processing steps are…
Method and apparatus reducing overshoot in a power supply controller
Granted: November 28, 2000
Patent Number:
6154377
A power supply controller with reduced overshoot at the power supply output during start up. In one embodiment, a power supply controller for a switched mode power supply includes a drain terminal to be coupled to a primary winding of a power supply transformer, a source terminal to be coupled to ground and a control terminal. The control terminal is to be coupled to provide bias supply power to the power supply controller and receive a feedback current from the power supply output. The…
Output feedback and under-voltage detection
Granted: November 14, 2000
Patent Number:
6147883
A switched mode controller for properly handling an under-voltage condition in a power line which includes a current mirror for receiving current from the power line; a reference current source coupled to the current mirror for supplying a reference current; and a power transistor coupled to the reference current source, the power transistor generating a pulse width modulated signal when current from the power line exceeds the reference current, the power transistor being disabled when…
Offline converter with integrated softstart and frequency jitter
Granted: August 22, 2000
Patent Number:
6107851
A pulse width modulated switch comprises a first terminal, a second terminal, and a switch that allows a signal to be transmitted between the first terminal and the second terminal according to a drive signal provided at a control input. The pulse width modulated switch also comprises a frequency variation circuit that provides a frequency variation signal and an oscillator that provides an oscillation signal having a frequency of that varies within a frequency range according to the…
Lateral power MOSFET with improved gate design
Granted: July 4, 2000
Patent Number:
6084277
A lateral power metal-oxide-semiconductor field effect transistor (MOSFET) having a gate design in which the gate structure is coupled to the gate electrode through contacts at a plurality of locations. The gate electrode is disposed over the gate structure along the length of a MOSFET finger. In one embodiment, the gate electrode is coupled to the gate structure through contacts at the ends of the MOSFET finger such that there is a contact-free portion of the gate region between the…
