Intersil Americas Inc.

Texas Instruments Corporation

Ben A Dowlat

Weihong Qiu

Rami Abou-Hamze

Steven Patrick Laur

Robert H Isham

David Alexander Grant

Brian Ashley Carpenter

Zhixiang Liang

Garry Trevor Tomlins

Communications systems and methods for transmitting communications between a charge system and an AC adapter are disclosed. In one embodiment, a communication system comprises an AC adapter disconnect switch that is switchable between coupling and decoupling an AC adapter DC output voltage to the charge system and a charge controller configured to modulate the AC adapter disconnect switch between coupling and decoupling to provide a communication signal to the AC adapter.

Communication systems and methods for transmitting communications between a charge system and an AC adapter

A circuit comprises a first input for receiving a supply voltage and a second input for receiving a sensed current signal from an output of a DC to DC converter. The circuit also includes an output voltage for providing an adjustable drive voltage to a drive circuit. The circuit additionally includes circuitry for adjusting the drive voltage responsive to supply voltage and the sensed current signal.

DC/DC converter with adaptive drive voltage supply

Gate driver topology for maximum load efficiency

A dual-edge modulation controller including first and second ramp circuits, first and second comparators, an error amplifier and pulse control logic. The first ramp circuit provides a leading-edge ramp synchronous with a clock. The error amplifier compares a feedback signal with a reference and provides a compensation signal. The first comparator compares the leading-edge ramp with the compensation signal and asserts a set signal. The second ramp circuit provides a trailing-edge ramp that begins ramping when the set signal is asserted. The second comparator compares the trailing-edge ramp with the compensation signal and asserts a reset signal. The pulse control logic asserts a PWM signal when the set signal is asserted and de-asserts the PWM signal when the reset signal is asserted. The controller may control multiple phases with current balancing. The slew rate of the ramps may be adjusted based on the number of PWM signal asserted.

PWM controller with dual-edge modulation using dual ramps

Growing community of inventors

San Jose, CA, United States of America

Ben A Dowlat