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数字控制带来更多的稳定性,更快的瞬态响应的油料模块
随着现代电信和计算机系统的电源管理要求的不断变化,电源设计人员正在慢慢地从模拟到数字控制迁移,以克服模拟补偿技术的局限性。例如,由于模拟电压模式控制回路是有限的带宽,因此,他们必须妥协在高带宽设计的稳定性和可靠性。此外,最新的微处理器和FPGAs要求更快的瞬态响应点负载(电压)DC / DC转换器,以提供更快的暂态响应稳定,模拟控制为基础的电源稳压器再次必须妥协性能。
本文提出了一种数字控制回路显示它能提供的带宽,以前无法获得的模拟控制。这是一个基于Intersil的白皮书,题为“¹快速瞬态响应通过数字控制实现稳定的电力供应。此外,使用一个设计实例说明数字控制回路可以提供更快的瞬态响应性能提高的同时保持一个稳定的环。
In pracTIce, a number of architectures are available to the point-of-load (POL) converter designer. Among them, the most common approach is the analog-fixed-frequency voltage-mode control with external compensaTIon. It is popular because of its ability to adjust poles and zeroes to extend the converter bandwidth while compensaTIng for a range of output capacitors. With a fixed switching frequency, the selecTIon of passive components is predictable and optimal. However, the downside is that with numerous external components, the compensation is complex, resulting in additional design time. The designer also must compromise transient response for a high-bandwidth performance or vice a versa