Fairchild FEB157-001 Operation & User’s Manual

7, © 2007 Fairchild Semiconductor Page 7 of 17 Rev 1.1 April 2007 www.fairchildsemi.com 3. Designed Solution 3.1 Schematic Figure 3: Schematic of the FEB157 Offline High Brightness LED Driver Board F1 1A, 250V C1 0.1µF R1 5.6Ω 1W C2 47µF 450V R7 22Ω 0805 Q1 FQD2N80 R10 10kΩ 1% 0603 Vref …

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4, © 2007 Fairchild Semiconductor Page 4 of 17 Rev 1.1 April 2007 www.fairchildsemi.com Since the output current is being controlled instead of the output voltage, the output voltage will actually vary with the number of LEDs on the output. The same applies to the auxiliary winding that provid…

5, © 2007 Fairchild Semiconductor Page 5 of 17 Rev 1.1 April 2007 www.fairchildsemi.com Table 1: Jumper JP1/JP2 Status and LED Current Refer to the schematic in Figure 3. As the LED current returns back to the power supply, it develops a voltage across the sense resistor(s). Once th…

10, © 2007 Fairchild Semiconductor Page 10 of 17 Rev 1.1 April 2007 www.fairchildsemi.com 3.4 Printed Circuit Board The PCB is a double sided board made of FR4 with 1oz copper. Figure 4: Silkscreen/Component Placement of PCB Layout R17 NIC Components or Equivalent NRC06J511TR 510Ω, 1/10 W,…