绿色PWM控制IC的设计

Hung-Da Hsu, T. Liang, Bin-Da Liu, Kai-Hui Chen
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引用次数: 5

摘要

降低开关电源的功耗,最有效的方法是降低开关频率。因此,用于开关稳压器的电流模式脉宽调制(PWM)控制器必须能够在轻负载条件下进行频率调制。绿模电路设计在电流型PWM控制集成电路中,采用关时调制的概念。在轻载工况下,开关频率的降低和开关损耗与负载的降低成正比。此外,该芯片还集成了前缘消隐(LEB)、软启动、斜率补偿和过电压保护(OVP)功能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Design of a green mode PWM control IC
To decrease the power consumption of a switching power supply, the most effective approach is to lower the switching frequency. Hence, the current mode pulse-width-modulation (PWM) controller used in a switching regulator must be capable of frequency modulation at light-load condition. The green mode circuit is designed in proposed current mode PWM control IC with the concept of off-time modulation. The switching frequency reduction and switch losses will be proportion to the load decrease at light-load condition. Also, the leading edge blanking (LEB), soft start, slope compensation, and over voltage protection (OVP) functions are integrated into the proposed chip.
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