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Fairchild FEB157-001 manual

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Table of contents for the manual

  • Page 1

    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 AN7554[...]

  • Page 2

    © 2007 Fairchild Semiconductor Page 2 of 17 Rev 1.1 April 2007 www .fairc hildsemi.com Contents 1. Introduction ............................................................................................................................................ 3 1.1 Product Description ......................................................................[...]

  • Page 3

    © 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. The output curr[...]

  • Page 4

    © 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. Consequently , the[...]

  • Page 5

    © 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). O nce this voltage reaches the base-emitter junction voltage of the [...]

  • Page 6

    © 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 2.2 Output Requirements The FEB157 board will po wer one, two, or three high brightness LEDs (Lumiled or similar) at user selectable load currents of 3[...]

  • Page 7

    © 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 0.1µF R1 5.6Ω 1W C2 47µF 450V R7 22Ω 0805 Q1 FQD2N80 R10 10kΩ 1% 0603 Vref Vcc Drive GND 87 65 123 4 FB S/S IS Rt/Ct C8 1µF C7 [...]

  • Page 8

    © 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 0.1µF , X2 cap C2 NIC Components NREH470M450V18X36F 47µF , 450V UCC ESMH451ESN470MN25S 47µF , [...]

  • Page 9

    © 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 0.2A, 250V , SOT -23 D4 Fairchild SS39 3A, 90V , SMC F1 Littlefuse 3721100 1A[...]

  • Page 10

    © 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 . Figure 4: Silkscreen/Component Placement of PCB Layout R17 NIC Components or Equivalent NRC06J511TR 510 Ω , 1/10 W , 0603 R18 NIC Components or Equivalent NRC06J101TR 100 [...]

  • Page 11

    © 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 Side Layer[...]

  • Page 12

    © 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. Figure 7: LED Current vs. Line V oltage Input Voltage (Vac) LED Current [...]

  • Page 13

    © 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. 0 10 20 30 40 50 60 70 80 90 90 120 270 Input[...]

  • Page 14

    © 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 State W aveforms at 270V ac with One LED at 350mA[...]

  • Page 15

    © 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. Figure 11: Startup Profile at 90 V ac with Three LEDs at 1A Figure 12: Startup Profile at 270V ac with Three LEDs at 1A[...]

  • Page 16

    © 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. R eplace components on the E valuation Board only with those parts shown on the parts list in the User's [...]

  • Page 17

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