DER-243 - 65W adapter

This engineering report introduces the notebook adapter power supply using Power Integrations TOPSwitch-JX TOP269EG. The power supply operates over a universal input range and provides a 19 V, 65 W output. It is designed and tested to operate in a sealed enclosure at external ambient temperatures up to +40 °C. By design, TOPSwitch-JX maintains nearly constant efficiency over a very wide load range without the need for special operating modes to meet specific load thresholds. This optimizes performance of existing and emerging energy efficiency regulations. Maintaining constant efficiency ensures that the design is optimized for future changes in energy efficiency regulations without the need for redesign. TOPSwitch-JX's low MOSFET capacitance enables higher switching frequencies without the efficiency loss seen with standard discrete MOSFETs. The 132 kHz switching frequency (rather than the 60 kHz to 80 kHz used for discrete MOSFETs) reduces the required transformer size, thereby reducing cost. This power supply provides the following protection features: Output OVP latching open-loop protection with latching shutdown Self-restoring overload protection Automatic restart in case of power outage or line voltage dip Precise thermal overload protection with large hysteresis with automatic recovery This document provides complete design details including specifications, schematics, bill of materials, and transformer design and construction information. This information includes data related to regulation, efficiency, standby, transient load, power limit, and conducts EMI scans.