1
Terry J Groom, Stuart Pullen: Virtual ripple generation in switch-mode power supplies. Semtech Corporation, Coats & Bennett P L L C, June 24, 2003: US06583610 (148 worldwide citation)

A system and method provides virtual ripple signal generation for use in voltage regulation applications. Some switch-mode power converters or voltage regulators use output signal ripple to effect voltage regulation. A virtual ripple generator provides this type of voltage regulator with a virtual r ...


2
Eric X Yang, Jason Guo: Multi-phase and multi-module power supplies with balanced current between phases and modules. Semtech Corporation, David B Ritchie, Thelen Reid & Priest, April 10, 2001: US06215290 (96 worldwide citation)

A multi-phase power supply utilizes a current sensor including a sensor inductor winding connected in parallel with a filter inductor winding at the output of each phase for sensing the phase currents and balancing the current by adjusting the duty cycle of each phase through feedback control. In ad ...


3
Patrice R Lethellier: Method and apparatus for sensing output inductor current in a DC-to-DC power converter. Semtech Corporation, O&apos Melveny & Myers, August 27, 2002: US06441597 (92 worldwide citation)

A current sense circuit for a DC-to-DC power converter accurately senses the output inductor current without adversely affecting efficiency of the power converter. The current sense circuit produces a current sense signal having amplitude sufficiently above the noise floor so that accurate load cont ...


4
Patrice R Lethellier: Buck converter with inductive turn ratio optimization. Semtech Corporation, D Alessandro & Ritchie, July 25, 2000: US06094038 (70 worldwide citation)

A DC--DC power converter circuit for converting relatively high input voltages to relatively low output voltages employs a buck-type circuit topology with a multiple winding inductor. An optional winding is provided to the inductor to clamp a voltage spike appearing on the drain of one of the switch ...


5
Patrice R Lethellier: Method and apparatus for accurately sensing output current in a DC-to-DC voltage converter. Semtech Corporation, O&apos Melveny & Myers, July 23, 2002: US06424129 (68 worldwide citation)

An apparatus and method for accurately sensing the output current delivered to a load by a buck-type DC-to-DC switched mode power converter corrects for thermal variation of the output inductor. A first current sense signal provides a fast indication of output current of the DC-to-DC converter that ...


6
Jian Yang: Multiple output power supply having soft start protection for load over-current or short circuit conditions. Semtech Corporation, O&apos Melveny & Myers, November 2, 2004: US06813170 (64 worldwide citation)

A protection circuit for a multiple output switching mode power converter protects against an over-current or short circuit failure condition. The protection circuit activates the soft-start circuit of the PWM control circuit upon detection of the over-current or short circuit condition. The soft-st ...


7
William Edward Rader III, John Fogg: Method and apparatus for voltage regulation in multi-output switched mode power supplies. Semtech Corporation, D Alessandro & Ritchie, May 2, 2000: US06057607 (56 worldwide citation)

A step-down switched-mode power supply circuit includes a transformer having at least one primary winding and at least one secondary winding, a current sensing device for sensing a current through a primary winding of the transformer, a first switch and a second switch, a first comparator for determ ...


8
William E Rader, David P Keesor: Charge pump with current limiting circuit. Semtech Corporation, Coats & Bennett P L L C, January 7, 2003: US06504422 (53 worldwide citation)

A charge pump power supply includes two or more modes of operation. An input protection circuit is connected between an input of the power supply and a voltage source. The input protection circuit regulates the voltage at the input of the power supply, limits current at the input when switching from ...


9
Eric X Yang, Jason Guo: Multi-phase and multi-module power supplies with balanced current between phases and modules. Semtech Corporation, David B Ritchie, Thelen Reid & Priest, June 11, 2002: US06404175 (47 worldwide citation)

A multi-phase power supply utilizes a current sensor including a sensor inductor winding connected in parallel with a filter inductor winding at the output of each phase for sensing the phase currents and balancing the current by adjusting the duty cycle of each phase through feedback control. In ad ...


10
Terry J Groom, Stuart Pullen, Kwang H Liu: Self-clocking multiphase power supply controller. Semtech Corporation, Coats & Bennett P L L C, December 17, 2002: US06495995 (46 worldwide citation)

A ripple-mode controller provides reliable operation in multi-phase power supply circuits, over a variety of operating conditions. Cross-phase blanking allows the controller to preserve the desired phase relationship between the switching pulses its provides to the different output phases, and permi ...