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| SP7686EB Evaluation Board Manual 2.7V to 5.5V Input Range One line serial interface Output Current up to 500mA High Efficiency in 1X mode, high VOUT in 2X mode Small 2x3mm 8-Pin DFN Package 2.4MHz Switching Frequency Integrated Design with Minimal Components. 3.5sec Time out function to protect the LED Thermal shutdown protection Built-in over-voltage & over-current protection Use with 1 cell Lithium Ion Battery DESCRIPTION AND BOARD SCHEMATIC The SP7686EB Evaluation Board is a compact circuit including the SP7686 in 3x2mm DFN and 3 small 0603 capacitors which can provide a stable drive current for a 1W LED such as the AOT White LED, Lumi-LEDs Luxeon I or PWF1 type light sources. The evaluation board is a completely assembled and tested surface mount board which provides easy probe access points to all SP7686 inputs and outputs so that the user can quickly connect and measure electrical characteristics and waveforms. SP7686EB Schematic TO GET STARTED: 1. Connect VIN from VIN to GND (VIN range 2.7V to 4.2V). 2. Apply a combination of positive pulses on CTRL pin to enable the part. Rev 3/20/07 SP7686EB Evaluation Board Manual Copyright 2007 Sipex Corporation POWER SUPPLY DATA Iout vs VIn 500 450 400 Flash 440mA Torch 160mA Torch 88mA 100 90 80 Efficiency vs Vin Iout (mA) 300 250 200 150 100 50 0 3.0 3.3 3.6 Efficiency (%) 350 70 60 50 40 30 20 10 0 Flash 440mA Torch 160mA Torch 88mA 3.9 4.2 3.0 3.3 3.6 3.9 4.2 Vin (V) Vin (V) Figure 1. Output Current with PWF1 LED Figure 2. Output Efficiency with PWF1 LED CTRL Vout CTRL Vout VFB VFB Iin: 0.5A/div Iin: 0.5A/div Figure 3. Start Up, Iout = 80mA, Vin=4.2V Figure 4. Start Up, Iout = 450mA, Vin=4.2V CTRL VFB Vout CTRL Vout Iin: 0.2A/div VFB Iin: 1A/div Figure 5. LED Shorted, Vin=4.2V Figure 6. LED Open, Vin=4.2V 2 EVALUATION BOARD LAYOUT NOT USED FIGURE 7: SP7686EB COMPONENT PLACEMENT NOT USED FIGURE 8: SP7686EB PC LAYOUT TOP SIDE NOT USED FIGURE 9: SP7686EB PC LAYOUT BOTTOM SIDE Note: "Not Used" section of the board is for optional CTRL PULSE digital circuit - consult factory Applications for details. 3 TABLE1: SP7686EB LIST OF MATERIALS Part Reference U1 CIN COUT CF RFB J1 TP(VIN,GND,VOUT,CTRL&VFB) Part Number SP7686ER GRM188R60J106M GRM188R61A225K GRM155R60J224K CRCW0603R680F 61303611121 60900213421 0300-11501-4727100 Value Size 3x2mm DFN - 8 pin Manufacturers/ Website www.sipex.cpm www.murata.com www.murata.com www.murata.com www.vishay.com www.we-online.com www.we-online.com Mil-Max (digi-key) 10uF/6.3V/X5R 2.2uF/10V/X5R 0.22uF/6.3V/X5R 0.68/1%, 1/10W /1%, 3-Pin 2.54mm Header 2.54mm Jumper Test point female pin 0603 0603 0402 0603 6.0x2.54mm 5.0x2.54mm .042" Dia ORDERING INFORMATION Model Temperature Range Package Type SP7686EB............................. ......-40C to +85C...................SP7686AEB Evaluation Board SP7686ER.....................................-40C to +85C...................................... 8-pin 3x2 DFN 4 |
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