SP7686EB Evaluation Board Manual 2.7V to 5.5V Input Range 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 One line serial interface Output Current up to 500mA 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 Efficiency vs Vin Iout vs VIn 500 100 450 90 400 80 Efficiency (%) Iout (mA) 350 Flash 440mA 300 Torch 160mA 250 Torch 88mA 200 70 60 50 40 30 Flash 440mA 100 20 Torch 160mA 50 10 Torch 88mA 0 0 150 3.0 3.3 3.6 3.9 3.0 4.2 3.3 Vin (V) 3.6 3.9 4.2 Vin (V) Figure 1. Output Current with PWF1 LED Figure 2. Output Efficiency with PWF1 LED CTRL CTRL Vout 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 CTRL VFB Vout 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 3x2mm DFN - 8 pin Manufacturers/ Website www.sipex.cpm 10uF/6.3V/X5R 0603 www.murata.com GRM188R61A225K 2.2uF/10V/X5R 0603 www.murata.com CF GRM155R60J224K 0.22uF/6.3V/X5R 0402 www.murata.com RFB CRCW0603R680F 0.68Ω/1%, Ω/1%, 1/10W 0603 www.vishay.com 61303611121 3-Pin 2.54mm Header 6.0x2.54mm www.we-online.com 60900213421 2.54mm Jumper 5.0x2.54mm www.we-online.com 0300-11501-4727100 Test point female pin .042" Dia Mil-Max (digi-key) Part Reference Part Number U1 SP7686ER CIN GRM188R60J106M COUT J1 TP(VIN,GND,VOUT,CTRL&VFB) Value Size ORDERING INFORMATION Model Temperature Range Package Type SP7686EB............................. ……-40°C to +85°C...................SP7686AEB Evaluation Board SP7686ER.....................................-40°C to +85°C...................................... 8-pin 3x2 DFN 4