AN2941 is an application note released by ST company, which mainly introduces the application characteristics of L6563S and L6566A two chips, suitable for 75W adapter design. This application note introduces the characteristics of the two chips, circuit principle, efficiency measurement, harmonic content measurement and function check.
This application note describes a 75W reference board (p/n EVL6566A-75WES4) designed for high-end portable computer power supplies. The design utilizes a two-stage architecture featuring a front-end PFC stage based on the L6563S and a flyback converter based on the L6566A. It achieves high efficiency at both active and light loads while complying with the latest ENERGY STAR criteria (EPA rev. 5.0).
| Output voltage | 19 V |
|---|---|
| Output current | 4 A |
| Input mains range | 90 to 264 Vac |
| Frequency range | 45 to 65 Hz |
| Standby consumption | < 0.14 W |
| Active load efficiency | better than 87% |
| Dimensions | 78 x 170 mm |
| PCB type | Single-side |
The output voltage is 19 V at 4 A continuous operation.
Yes, the design is compliant with the latest computer document (EPA rev. 5.0 computers) effective July 2009.
The standby mains consumption is less than 0.14 W at 230 Vac.