AND8224/D NCP101x LED Flasher with Luxeon V Star LED Prepared by: Jan Grulich ON Semiconductor http://onsemi.com APPLICATION NOTE • Wide Input Voltage Range: 85 – 265 Vac • Smaller Size, Lower Weight, Lower Total Cost • Good Line Regulation, No Need of Additional Linear This application note describes how to easily design simple, isolated AC−DC converter for powering Luxeon V Star LED in flashing mode. Some examples are: warning lamps, emergency signs, beacon and so on. In comparison with resistive or capacitive dropper with electronic chopper is this solution more comfortable and features some advantages such as: • • • • Regulators Efficient Design with up to 80% Efficiency Overload, Short Circuit and Thermal Protected Simple for Mass Production Thanks to SMD Devices Universal Design for Variety of LEDs – 1 W, 3 W, 5 W Figure 1. NCP101x LED Flasher with value of around 1 nF is necessary to be connected as close to the FB pin, as possible. As the flash function is used special part of the safety circuitry of the NCP101x Switcher. The timing of the flashing period is given by the VCC capacitor E3. The duty cycle is fixed and is given by the internal consumption of the IC. The monolithic power switcher, used in this application, greatly simplifies the total design and reduces time to production. The new line of the Power Switchers NCP1010 – 1014 is ideal for this purpose. This IC in the SOT−223 package reduces size and is suitable for mass production. The output power is given only by proper selection of this Switcher. The design consists of safety resistor, rectifier with filtering capacitor, power stage with switcher and transformer, output ultrafast rectifier, output filtering capacitor and high power Luxeon LED. The only component necessary for proper powering of the IC is the VCC capacitor. The IC is directly powered from the HV Drain circuit via internal voltage regulator. To eliminate the noise at the feedback input, some small ceramic capacitor © Semiconductor Components Industries, LLC, 2005 June, 2005 − Rev. 0 LED and Switcher Selection 1 Switcher IC LED selection NCP1011ST65 Luxeon Star NCP1012ST65 Luxeon III Star NCP1013ST65 Luxeon V Star Publication Order Number: AND8224/D AND8224/D SCHEMATIC DIAGRAM E1 D2 MRA4007T3 2.2 mF/400 V D1 MRA4007T3 ZD1 150 V D4 MBRS340T3 + ZD2 9V1 + U1 NCP1013ST65 VCC R2 100R Fusible D3 MURA160T3 HV GND 14:1 LP = 1, 3 mH FB E2 47 mF/16 V + C1 1 nF E3 47 mF/16 V Figure 2. Complete Schematic Diagram of the LED Flasher COMPONENT LAYOUT Figure 3. Component Layout – Top Side Figure 4. Component Layout – Bottom Side http://onsemi.com 2 LD1 LX_Star AND8224/D PCB LAYOUT Figure 5. PCB Layout Contact Address of the Transformer Manufacturer: Bill of Materials Value Part Package C1 Ceramic 1 nF/50 V C0805 D1 MRA4007T3 SMA D2 MRA4007T3 SMA D3 MURA160T3 SMA D4 MBRS340T3 SMC E1 2.2 mF/400 V E5/10 E2 47 mF/16 V E2,5/5 E3 47 mF/16 V E2,5/5 LD1 LXHL−LH3C LUX−STAR R2 100 W Fusible R RM7,5 TR1 UNI−EE16 EF16 U1 NCP1013ST65 SOT−223 ZD1 BZG03C150 SMA ZD2 1.5SMC9.1AT3 SMC Order number: Transformer for NCP101x LED Flasher Manufacturer: P&V Elektronic Mr. Josef Viktora Kasejovice 389 335 44 Kasejovice Czech Republic, Europe e−mail: [email protected] Tel./Fax: 371 595 412 / 371 595 280 http://onsemi.com 3 AND8224/D ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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