A single chip 1 MHz 500 V full/half bridge driver and primary side power supply controller HVIC capable of multiple modes of operation

摘要

A high-voltage IC (HVIC) capable of controlling and driving power FETs in both full- and half-bridge power circuits employing either pulse width modulation (PWM) or resonant circuit topologies is discussed. The IC also includes a voltage-controlled oscillator capable of varying pulse width and/or frequency, thus providing a means of resonant converter control. High-voltage isolation (500 V) and level shifting for upper-side FETs is achieved on-chip, and 1 MHz operation driving four NMOS with 1000 pF gates has been demonstrated. Several power supply control and housekeeping functions are included on the chip. A window comparator which detects and reconstructs isolated pulses from a secondary side control is also included on-chip, thus providing a means of communication between the primary and secondary sides of the power supply. The combination of 15 V control logic with both high-voltage and low-voltage drivers enables this HVIC to be a single-chip primary-side controller for a variety of power circuit topologies.