One of the most important safety regulations to
which an off-line power supply must conform is
input to output electrical isolation. This isolation
requirement prevents the power supply control
IC from directly sensing both the input line and
output voltages. In the case of primary side
control the output regulation information, an
error voltage, must be transferred from the secondary
side. This application note discusses a
simple way of transmitting regulation information
across the electrical isolation using an AS431
and a conventional 4N27 opto-coupler.
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