A small-signal model is established for the basic constant voltage (CV) flyback converter firstly. Then the phase margin and the bandwidth, which can reflect the system stability and rapidity, are deduced through transfer function. The parameters affecting the stability of the system can be obtained by the model's derivation to confirm the appropriate external capacitance value. To improve the precision of CV, the compensation of cable is implemented through the module of irrigation current, pulling down the output voltage under any load conditions to the value of it with the maximal load. The prototype for the proposed CV converter has been fabricated in an MXIC 0.8 μm L80A1 process. The minimal static power consumption measured by a test is only 40 mW. In the CV mode, the precision of the output voltage can reach the level of ±1.5%. Therefore, the proposed control chip has a promising application in low power CV AC–DC flyback converter.

中文翻译：

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高精度恒压反激转换器的设计

首先为基本恒压（CV）反激转换器建立了一个小信号模型。然后通过传递函数推导了可以反映系统稳定性和快速性的相位裕量和带宽。可以通过模型推导获得影响系统稳定性的参数，以确认适当的外部电容值。为了提高CV的精度，通过灌溉电流模块对电缆进行补偿，在任何负载条件下将输出电压下拉至最大负载时的电压值。拟议的CV转换器的原型已通过MXIC 0.8μmL80A1工艺制造。通过测试测得的最小静态功耗仅为40 mW。在CV模式下，输出电压的精度可以达到±1.5％的水平。