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.
Precise constant-current control regulates accurate output current versus changes in input voltage and output voltage. The operating frequency is proportionally changed by the output voltage to guarantee Discontinuous Conduction Mode (DCM) operation with higher efficiency and simpler design. The FL7730MY provides protections such as open-LED, short-LED, and over-temperature protections. Current-limit level is automatically reduced to minimize output current and protect external components in a short-LED condition.
The FL7730MY frequency-hopping function in the oscillator improves EMI performance. The FL7730MY controller is available in an 8-pin SOP package.
Compatible with Traditional TRIAC Control (No need to change existing lamp infrastructure: wall switch wire)
Compatible with Non-Dimming Lamp Designs
Cost-Effective Solution without Input Bulk Capacitor and Feedback Circuitry
Power Factor Correction (PFC)
Accurate Constant-Current (CC) Control, Independent Online Voltage, Output Voltage,Magnetizing Inductance Variation
Line Voltage Compensation for CC Control
Linear Frequency Control for Better Efficiency and Simple Design
Cycle-by-Cycle Current Limiting
Over-Temperature Protection with Auto Restart
Low Startup Current: 20μA
Low Operating Current: 5mA
Frequency Hopping for Better EMI Performance
SOP-8 Package Available
LED Lighting System