Related Manuals for Fairchild FEB157-001
Summary of Contents for Fairchild FEB157-001
- Page 1 FEB157-001 User’s Guide Offline High Brightness LED Driver Evaluation Board Featured Fairchild Product: FAN7554 © 2007 Fairchild Semiconductor Page 1 of 17 Rev 1.1 April 2007...
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Page 2: Table Of Contents
3.4 Printed Circuit Board ...10 4. Test Results ...12 4.1 Regulation ...12 4.1.1 Line Regulation ...12 4.2 Efficiency ...13 4.3 Steady State Operation ...14 4.4 Start up ...15 © 2007 Fairchild Semiconductor Page 2 of 17 www.fairchildsemi.com Rev 1.1 April 2007... -
Page 3: Introduction
1. Introduction 1.1 Product Description A high brightness LED evaluation board has been developed using the Fairchild Semiconductor FAN7554D PWM controller. The board has the capability of driving one, two or three Lumiled, or similar LEDs. The output current is user selectable at 350mA, 700mA, or 1A. The current is selectable by inserting or removing jumpers JP1 and JP2 on the evaluation board. - Page 4 R15, and R16 are the resistors that sense the return current from the LED load. Jumpers JP1 and JP2 allow the selection of the output current. Table 1 describes the jumper status for particular output currents. © 2007 Fairchild Semiconductor Page 4 of 17 Rev 1.1 April 2007...
- Page 5 Thermistor RTH1, is a negative temperature coefficient device and compensates for changes in base-emitter voltage due to temperature change. © 2007 Fairchild Semiconductor Table 1: Jumper JP1/JP2 Status and LED Current JP1 Status...
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Page 6: Electrical Requirements
2.2 Output Requirements The FEB157 board will power one, two, or three high brightness LEDs (Lumiled or similar) at user selectable load currents of 350mA, 700mA, or 1A. © 2007 Fairchild Semiconductor Page 6 of 17 www.fairchildsemi.com Rev 1.1 April 2007... -
Page 7: Designed Solution
Vcc Drive GND 10kΩ FAN7554D 0.01µF 0603 Rt/Ct FOD817A 0.1µF 1µF 1800pF Figure 3: Schematic of the FEB157 Offline High Brightness LED Driver Board © 2007 Fairchild Semiconductor 22kΩ EFD20 Core/Bobbin 2010 47µF 1000pF 450V 22kΩ 2010 Lm = 610µH RS1M 10Ω... -
Page 8: Transformer
NIC Components or Equivalent NIC Components or Equivalent NIC Components or Equivalent NIC Components or Equivalent Panasonic © 2007 Fairchild Semiconductor Schematic 1/2 Pri - 36 T 1/2 Pri - 36 T Output - 10 T Vcc - 25 T Spec. - Page 9 NIC Components or Equivalent NIC Components or Equivalent NIC Components or Equivalent NIC Components or Equivalent NIC Components or Equivalent NIC Components or Equivalent © 2007 Fairchild Semiconductor Part Number 1729018 2 position terminal block 535676-5 6 position connector RS1M 1A, 1000V, SMA Prov.
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Page 10: Printed Circuit Board
Keystone Fairchild 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 © 2007 Fairchild Semiconductor Part Number NRC06J511TR 510Ω, 1/10 W, 0603 NRC06J101TR 100Ω, 1/10 W, 0603 Prov. - Page 11 Figure 5: Silkscreen/Component Placement of Top Side Layer Figure 6: Silkscreen/Component Placement of Bottom Side Layer © 2007 Fairchild Semiconductor Page 11 of 17 Rev 1.1 April 2007...
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Page 12: Test Results
This graph illustrates the regulation of the output current over line voltage for the three possible settings, 350mA, 700mA, and 1A. 1200 1000 © 2007 Fairchild Semiconductor Input Voltage (Vac) Figure 7: LED Current vs. Line Voltage Page 12 of 17 www.fairchildsemi.com... -
Page 13: Efficiency
The efficiency data shown is for the converter with a load of one, two and three LEDs driven at 1A. Figure 8: Converter Efficiency Data Plotted Against Increasing Line Input © 2007 Fairchild Semiconductor Input Voltage (V) for LED Current of 1A. -
Page 14: Steady State Operation
4.3 Steady State Operation Figure 9: Steady State Waveforms at 90Vac with Three LEDs at 1A Figure 10: Steady State Waveforms at 270Vac with One LED at 350mA © 2007 Fairchild Semiconductor Page 14 of 17 Rev 1.1 April 2007... -
Page 15: Start Up
The startup profile is captured at 90Vac and 270Vac with a load of three LEDs operating at a current of 1A. Figure 11: Startup Profile at 90 Vac with Three LEDs at 1A Figure 12: Startup Profile at 270Vac with Three LEDs at 1A © 2007 Fairchild Semiconductor Page 15 of 17 www.fairchildsemi.com Rev 1.1 April 2007... - Page 16 Either the applicable sales contract signed by Fairchild and Buyer, or if no contract exists Fairchild's Standard Terms and Conditions on the back of Fairchild invoices, govern the terms of sale of the products described herein.
- Page 17 © 2007 Fairchild Semiconductor Page 17 of 17 Rev 1.1 April 2007...