NXP TEA1753T GreenChip III开关电源控制方案
NXP公司的TEA1753T是第三代 GreenChip III开关电源(SMPS)控制器,它集成了功率因素修正(PFC)控制器和反激控制器,通用火线电压70 VAC到276 VAC,内建的绿色功能在各个功率等级都实现了高效率:大功率时采用准谐振工作,低功率时采用降频工作,并把PFC关断,以获得高效率.主要用在250W的高削低成本电源,特别是笔记本电脑适配器.本文介绍了TEA1753T主要特性和优势,方框图, 典型配置图和典型应用框图.
The GreenChip III is the third generation of green Switched Mode Power Supply (SMPS) controller ICs. The TEA1753T combines a controller for Power Factor Correction (PFC) and a flyback controller. Its high level of integration allows the design of a cost-effective power supply with a very low number of external components.
The special built-in green functions provide high efficiency at all power levels. This applies to quasi-resonant operation at high power levels, quasi-resonant operation with valley skipping, as well as to reduced frequency operation at lower power levels. At low power levels, the PFC switches off to maintain high efficiency.
During low power conditions, the flyback controller switches to frequency reduction mode and limits the peak current to an adjustable minimum value. This will ensure high efficiency at low power and good standby power performance while minimizing audible noise from the transformer.
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