Microsemi Corp. AC DC Converters, Offline Switches LX1554ID

The LX1554ID is part of the LX155x family of current mode control integrated circuits designed for offline converter applications. It features an ultra-low start-up current of 250µA maximum, making it suitable for energy-efficient designs, particularly in personal computer and CRT power supplies. The device requires a minimal set of external components, which enhances its cost-effectiveness for consumer applications. The LX1554ID operates with a maximum duty cycle of less than 50% and includes a precision 2.5V reference, an error amplifier, and a current sense comparator. It supports pulse-by-pulse current limiting and has built-in under-voltage lockout circuitry. The device is capable of operating at a frequency of up to 500kHz, providing flexibility in system design. With its enhanced load response characteristics and automatic feed-forward compensation, the LX1554ID is well-suited for applications such as economy off-line flyback or forward converters, as well as DC-DC buck or boost converters. The part is available in various package options, including an 8-pin SOIC, and is RoHS compliant.