Power Integrations - DER581

This report describes a universal input, 19 V, 45 W isolated
flyback converter employing LNK6777E from the LinkSwitch-HP family of ICs. It
contains the complete specification of the power supply, a detailed circuit
diagram, the entire bill of materials required to build the supply, extensive
documentation of the power transformer, along with test data and waveform plots
of the most important electrical waveforms.

The most significant aspect of this design is to demonstrate implementing
secondary side optocoupler feedback with LinkSwitch-HP devices.

Typical LinkSwitch-HP designs are primary side regulated however the addition
of optocoupler feedback allows the part to address applications with both
stringent transient response (0 to 100%) and no-load input power (