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PWR-TOP202YAI是一种三端开关电源单片集成电路,简称为TOP开关电路。它用作固定开关频率(100kHz)控制的、以断续模式对功率因数进行校正预调整稳压器,可改善功率因数并且减小总谐波失真,提高交流电利用率,也可应用于高效率电源或电子镇流器。 普通交流电整流变换成直流电源,整定电路负荷是大容量电容器。这类电路中,整流器在大部分时间内是处于截止状态,仅在每周期很短时间内导通,此时将通过很大脉冲电流给负荷电容器充电。这样,电网供电仅在占空比20％左右,因此在这样短的时间内提供电流,电流波形必然会严重失真并伴随有超前
PWR-TOP202YAI is a three-terminal switching power supply monolithic integrated circuit, referred to as the TOP switching circuit. It is used as a fixed switching frequency (100kHz) to control the power factor in discontinuous mode. Pre-regulator, can improve the power factor and reduce the total harmonic distortion, improve the utilization of AC, can also be applied to high efficiency Power or electronic ballast. Commutation of ordinary AC rectifier into DC power, tuning circuit load is a large capacity capacitor. In this type of circuit, the rectifier is off for most of the time and only conducts for a short period of time, charging the load capacitor with a very large pulse current. In this way, the grid power supply only about 20% duty cycle, so in such a short period of time to provide current, the current waveform is bound to be seriously distorted and accompanied by advanced