Spice model helps improve Time-to-Market performance (Christophe Basso)

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Within the wide family of switch mode power supplies (SMPS), flyback converters represent the preferred structure for use in small and medium power applications (1W to 100W) such as wall adapters, off-line battery chargers, fax machines, etc. With the recent introduction of ON Semiconductor NCP1200, the design phase of a flyback circuit has been simplified considerably: two passive components plus a MOSFET around the integrated circuit. However, the impact of the environment upon the system can be much longer to assess: ESR variations due to temperature cycles, aging of the capacitors, various types of load, load and line transients, effect of the filter stage, electromagnetic filter, etc. A Spice simulator can help the designer to quickly implement his concept and show how it reacts to the outside world constraints. This brings several benefits such as an immediate understanding of how the circuit operates and naturally, an improved time-to-market cycle.

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