RDR-91 12 V, 1 A, Universal Input Supply
11-Feb-13
1 Introduction
This report describes a universal input, 12 V, 1 A flyback power supply using a
TNY278PG 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.
AC
AC
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+
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Figure 1 – RD-91 Populated Circuit Board Photographs.
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
Page 4 of 35
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