L6562AT Transition-Mode PFC Controller STMicroelectronics L6562AT Transition-Mode PFC Controller is a current-mode PFC controller operating in transition mode. Coming with the same pin-out as its predecessors L6561 and L6562, it offers improved performance. The highly linear multiplier includes a special circuit that is able to reduce AC input current distortion. This allows wide-range-mains operation with an extremely low THD, even over a large load range.