Abstract: A controller for a boost power factor correction (PFC) converter. The controller is configured to operate the boost PFC converter in multiple operating modes, including a continuous conduction mode (CCM), a transition mode (TM), and a hybrid mode in which the controller operates the converter in both CCM and TM within a same line cycle. An example controller includes a current control loop and a mode transition circuit. The current control loop is configured to compute an inductor current for each of first and second operation modes, based on a current sample taken, for example, during a boost synchronous rectifier conduction period of the converter. The mode transition circuit includes digital logic circuitry and is configured to generate a pulse indicating that one, two or all three of: zero-voltage switching (ZVS) has been achieved; the synchronous rectifier conduction period is active; and/or one of TM or hybrid mode is active.

Abstract: A controller for a boost power factor correction (PFC) converter. The controller is configured to operate the boost PFC converter in multiple operating modes, including a continuous conduction mode (CCM), a transition mode (TM), and a hybrid mode in which the controller operates the converter in both CCM and TM within a same line cycle. An example controller includes a current control loop and a mode transition circuit. The current control loop is configured to compute an inductor current for each of first and second operation modes, based on a current sample taken, for example, during a boost synchronous rectifier conduction period of the converter. The mode transition circuit includes digital logic circuitry and is configured to generate a pulse indicating that one, two or all three of: zero-voltage switching (ZVS) has been achieved; the synchronous rectifier conduction period is active; and/or one of TM or hybrid mode is active.

Abstract: Systems and methods are discussed for using a floating-gate MOSFET as a programmable reference circuit. One example of the programmable reference circuit is a programmable voltage reference source, while a second example of a programmable reference circuit is a programmable reference current source. The programmable voltage reference source and/or the reference current source may be incorporated into several types of circuits, such as comparator circuits, current-mirror circuits, and converter circuits. Comparator circuits and current-mirror circuits are often incorporated into circuits such as converter circuits. Converter circuits include analog-to-digital converters and digital-to-analog converters.