Instruction/ maintenance manual of the product FEB157-001 Fairchild
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www .fairchildsemi.com © 2007 Fairchild Semiconductor Page 1 of 17 Rev 1.1 April 2007 FEB157-001 User ’ s Guide Offline High Brightness LED Driver Evaluation Board Featured Fairchild Pr oduct: F A.
© 2007 Fairchild Semiconductor Page 2 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com Contents 1. Introduction ..........................................................................................................................................
© 2007 Fairchild Semiconductor Page 3 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com 1. Introduction 1.1 Product Description A high brightness LED evaluation board has been dev eloped using the F airchild S emiconductor F AN7554D PWM controller . The boar d has the capability of driving one, two or three Lumiled, or similar LEDs.
© 2007 Fairchild Semiconductor Page 4 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com Since the output current is being contr olled 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 provides the bias supply to the F AN7554D.
© 2007 Fairchild Semiconductor Page 5 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com T able 1: Jumper JP1/JP2 Status and LED Current R efer to the schematic in F igur e 3. As the LED current returns back to the po wer supply , it develops a voltage across the sense resistor(s).
© 2007 Fairchild Semiconductor Page 6 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com 2. Electrical Requirements 2.1 Input Requirements V oltage range: 90V rms to 270V rms Fr equency: 47Hz to 63Hz 2.
© 2007 Fairchild Semiconductor Page 7 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com 3. Designed Solution 3.1 Schematic Figure 3: Schematic of the FEB157 Offline High Brightness LED Driver Board F1 1A, 250V C1 0.
© 2007 Fairchild Semiconductor Page 8 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com 3.2 T ransformer 3.3 Bill of Materials Sch Ref Vendor Part Number Description BD1 Fairchild DF10S 1.5A, 1000 V Bridge C1 NIC Components or Equivalent NPX104M275VX2M 0.
© 2007 Fairchild Semiconductor Page 9 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com Conn1 Phoenix Contact 1729018 2 position ter minal block Conn2 T yco 535676-5 6 position connector D1 Fairchild RS1M 1A, 1000V , SMA D2 Fairchild Prov . for MMBD4148 D3 Fairchild BAS21 0.
© 2007 Fairchild Semiconductor Page 10 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com 3.4 Printed Circuit Board The PCB is a double sided board made of FR4 with 1oz copper .
© 2007 Fairchild Semiconductor Page 11 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com Figure 5: Silkscreen/Component Placement of T op Side Layer Figure 6: Silkscreen/Component Placement of Bottom .
© 2007 Fairchild Semiconductor Page 12 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com 4. T est Results 4.1 Regulation 4.1.1 Line Regulation This graph illustrates the regulation of the output current o ver line voltage for the thr ee possible settings, 350mA, 700mA, and 1A.
© 2007 Fairchild Semiconductor Page 13 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com 4.2 Efficiency The efficiency data shown is for the converter with a load of one, two and three LEDs driv en at 1A. Figure 8: Converter Efficiency Data Plotted Against Increasing Line Input for LED Current of 1A.
© 2007 Fairchild Semiconductor Page 14 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com 4.3 Steady State Operation Figure 9: Steady State W aveforms at 90V ac with Three LEDs at 1A Figure 10: Steady .
© 2007 Fairchild Semiconductor Page 15 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com 4.4 Start up The startup profile is captured at 90V ac and 270V ac with a load of three LEDs operating at a current of 1A.
© 2007 Fairchild Semiconductor Page 16 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com Wa rning and Disclaimer: This E valuation Board may emplo y high voltages so appropriate safety pr ecautions should be used when operating this board.
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