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准谐振SPICE模式反馈环设计指南
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2009-06-01
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Within the wide family of Switch Mode Power Supplies
(SMPS), the Flyback converters represent the structure of
choice for use in small and medium power applications. For
compact designs and radio−frequency sensitive
applications, e.g. TV sets or set−top boxes, Quasi− Resonant
power supplies start to take a significant market share over
the traditional fixed frequency topology. However, if the
feedback loop control is well understood with this latter, for
instance via a comprehensive literature and SPICE models,
the situation differs for self−oscillating variable switching
frequency structures where no model still exists. This article
will show how a simple large−signal averaged SPICE model
can be derived and used to ease the design work during
stability analysis.
(SMPS), the Flyback converters represent the structure of
choice for use in small and medium power applications. For
compact designs and radio−frequency sensitive
applications, e.g. TV sets or set−top boxes, Quasi− Resonant
power supplies start to take a significant market share over
the traditional fixed frequency topology. However, if the
feedback loop control is well understood with this latter, for
instance via a comprehensive literature and SPICE models,
the situation differs for self−oscillating variable switching
frequency structures where no model still exists. This article
will show how a simple large−signal averaged SPICE model
can be derived and used to ease the design work during
stability analysis.
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