EPR-91 Datasheet, PDF (5/36 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-91 - 12 W Power Supply using

7-Feb-2006
EP-91 12 V, 1 A, Universal Input Supply
1 Introduction
This report describes a universal input, 12 V, 1 A flyback power supply using a TNY278P
device from the TinySwitch-III 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
oscillographs of the most important electrical waveforms. The board provides a number
of user configurable options which are designed to demonstrate the features and
flexibility of the TinySwitch-III family. These include easy adjustment of the device
current limit for increased output power or higher efficiency operation, and a latched
output overvoltage shutdown.
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Figure 1 – EP-91 Populated Circuit Board Photographs.
Page 5 of 36
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