Fairchild FL7730MY 5V0.7A手机电池充电解决方案
Fairchild公司的FL7730MY是单级初级边调整的PWM控制器,为单级反激转换器提供了增强性能,采用的TRUECURRENT™拓扑能简化LED照明应用的电路设计,从而降低成本,提高了功率因素,降低总谐波失真.起动电流20uA,工作电流5mA,主要于LED照明.本文介绍了FL7730MY主要特性,方框图, 输入电压90-140VAC的TRIAC调光LED驱动电路图以及90V-264VAC的评估板5.0V/0.7A手机电池充电器主要指标,电路图,材料清单和PCB布局图.
FL7730MY:Single-Stage Primary-Side-Regulation PWM Controller for PFC and LED Dimmable Driving
This highly integrated PWM controller, FL7730MY, provides several features to enhance the performance of single-stage flyback converters. The proprietary topology, TRUECURRENT™, enables the simplified circuit design for LED lighting applications.
TRIAC dimming is smoothly managed by dimming brightness control without flicker. By using single-stage topology with primary-side regulation, an LED lighting board can be implemented with few external components and minimized cost. It does not require an input bulk capacitor or feedback circuitry. To implement good power factor and low total harmonic distortion, constant on-time control is utilized with an external capacitor connected to the COMI pin.
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