AN-22

Many TOPSwitch flyback power supply applications require two or more outputs to supply a variety of secondary circuits. Typical consumer applications of these multiple output converters AN-22 include television and related products such as settop decoders and video cassette recorders (VCRs). Industrial applications generally require a number of outputs to supply analog and digital low voltage circuitry. Motor control applications often require several separately isolated outputs to supply half-bridge drivers and control circuitry.

When compared to single output flyback supplies, AN-22 demand further design considerations to optimize the performance. The design of multiple output power supplies always requires some breadboarding to verify transformer designs, feedback techniques and system behavior. This pplication Note provides guidelines to streamline the decision making process and to reduce development effort for an optimized design. An example multiple output power supply design illustrates the procedure. All essential aspects are considered.