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AN-9750 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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AN-9750 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 13 page www.fairchildsemi.com © 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.3 • 5/15/12 AN-9750 High-Power Factor Flyback Converter for LED Driver with FL7732 PSR Controller Introduction This highly integrated PWM controller, FL7732, provides several features to enhance the performance of low-power flyback converters. The proprietary topology enables simplified circuit design for LED lighting applications. By using single-stage topology with primary-side regulation, a LED lighting board can be implemented with few external components and minimized cost, without requiring an input bulk capacitor and feedback circuitry. To implement high power factor and low THD, constant on-time control utilizes an external capacitor connected at the COMI pins. Precise constant-current control regulates accurate output current across changes in input voltage and output voltage. The operating frequency is proportionally changed by the output voltage to guarantee DCM operation with higher efficiency and simple design. FL7732 provides protection functions such as open-LED, short-LED and over- temperature protection. The current-limit level is automatically reduced to minimize the output current and protect external components in short-LED condition. This application note presents practical design consideration for an LED driver employing Fairchild Semiconductor PWM PSR controller FL7732. It includes designing the transformer, selecting the components, and implementing constant current regulation. The step-by-step design procedure helps engineers design a power supply. The design procedure is verified through an experimental prototype converter. Figure 1 shows the typical application circuit of primary-side controlled flyback converter using FL7732 created in the design example. Figure 1. Typical Application Circuit |
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