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FC9931 Datasheet(PDF) 1 Page - First Silicon Co., Ltd |
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FC9931 Datasheet(HTML) 1 Page - First Silicon Co., Ltd |
1 / 6 page SEMICONDUCTOR TECHNICAL DATA FC9931 2012. 10. 31 1/6 Revision No : 0 Features Constant output current Large step-down ratio Unity power factor Low input current harmonic distortion Fixed frequency or fixed off-time operation Internal 450V linear regulator Input and output current sensing Input current limit Enable, PWM and phase dimming Applications Offline LED lamps and fixtures Street lamps T raffic signals Decorative lighting General Description The FC9931 is a fixed frequency PWM controller IC designed to control an LED lamp driver using a single-stage PFC buckboost-buck topology. It can achieve a unity power factor and a very high step-down ratio that enables driving a single high-brightness LED from the 85-264VAC input without a need for a power transformer. This topology allows reducing the filter capacitors and using non-electrolytic capacitors to improve reliability. The FC9931 uses open-loop peak current control to regulate both the input and the output current. This control technique eliminates a need for loop compensation, limits the input inrush current, and is inherently protected from input under-voltage condition. Capacitive isolation protects the LED Lamp from failure of the switching MOSFET. FC9931 provides a low-frequency PWM dimming input that can accept an external control signal with a duty ratio of 0-100% and a frequency of up to a few kilohertz. The PWM dimming capability enables FC9931 phase control solutions that can work with standard wall dimmers. Typical Application Circuit VIN GATE CS1 CS2 VDD PWM D RT GN D R ref2 R ref1 R CS1 R CS2 C2 VIN L1 L2 C1 Q1 D3 R S1 R S2 D4 VO + - D1 D2 ~AC ~AC C IN R T FC9931 Unity Power Factor LED Lamp Driver |
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