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The DER-287 is a single-stage converter designed with the LNK409EG, one of the LinkSwitch-PH family of LED driver ICs. Single-stage technology greatly extends product life by eliminating the need for optical isolators and large aluminum electrolytic capacitors used in traditional two-stage designs.
Power Integrations said that achieving high power conversion efficiency is as important as LED choice in improving the overall luminous efficiency of lighting fixtures. If a single-stage topology is not used, it is extremely difficult to achieve an efficiency of more than 88% in a cost-effective manner in a T8 tube with a small space. The efficiency of the design is easily over 91%.
In addition to a highly integrated monolithic design that integrates controller, driver and switching MOSFETs into one package simultaneously, Power Integrations' LinkSwitch-PH product line includes over-temperature protection and over-current protection. This means that only a few peripheral components are required to implement the design.
In addition, the LinkSwitch-PH LED driver IC meets the requirements of low THD or high PF for commercial and industrial lighting products, making the final design suitable for the global market. 
Power Integrations introduces T8 lamp ballast design efficiency over 91%
[High-tech LED] General Lighting LED driver IC company Power Integrations released a new 25 W LED T8 lamp ballast power supply reference design. The most striking feature of this design (DER-287) is its efficiency of over 91%, reaching industry-leading levels, while still meeting power factor (PF greater than 0.9) and harmonic distortion (EN61000-3-2 Class C). Commercial requirements.