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| SP6686EB Evaluation Board Manual 2.7V to 5.5V Input Range Typical 150mA Torch or 400mA Flash Output Current High Efficiency in 1X mode, high VOUT in 2X mode Small 3x3mm 10-Pin DFN Package 2.4MHz Switching Frequency Enables Small Components Integrated Design with Minimal Components. Use with 1 cell Lithium Ion Battery DESCRIPTION AND BOARD SCHEMATIC The SP6686EB Evaluation Board is a compact circuit including the SP6686 in 3x3mm 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 SP6686 inputs and outputs so that the user can quickly connect and measure electrical characteristics and waveforms. SP6686EB Schematic Vin: 3.0-4.2V J2 SP6686 1 Vin C1 C2 FLASH EN VOUT PGND SGND IFB ISET 10 9 8 7 6 Cin 1 4.7uF .47uF 2 3 CF 2 3 4 5 Cout 2.2uF D1 1W LED Vfb=50mV Torch 150mA 132mV Flash 400mA R SET 106K R FB SW1 R EN 10K 0.33Ohm Push ON TO GET STARTED: 1. Connect VIN from VIN to GND (VIN range 2.7V to 4.2V). 2. Select mode between TORCH and FLASH by putting jumper into corresponding position. 3. Apply High to ON terminal to turn the LED on. Rev 04/19/05 SP6686EB Evaluation Board Manual Copyright 2005 Sipex Corporation POWER SUPPLY DATA 250 200 Iout (mA) 150 100 50 0 3.0 3.2 3.4 3.6 Vin (V) 3.8 4.0 4.2 Torch Mode 150m A Iout 600 500 400 Iout (mA) Flash Mode 400m A Iout Vf = 3.5V Vf = 3.3V Vf = 3.1V Vf = 3.0V 300 200 100 0 3.0 3.2 3.4 Vf = 4.1V Vf = 3.8V Vf = 3.5V Vf = 3.2V 3.6 Vin (V) 3.8 4.0 4.2 Figure 1. Torch Mode Output Current 100 90 Efficiency (%) Torch Mode 150m A Efficiency Figure 2. Flash Mode Output Current 100 90 Efficiency (%) 80 70 60 50 40 Flash Mode 400m A Efficiency Vf = 4.1V Vf = 3.8V Vf = 3.5V Vf = 3.2V 80 70 Vf = 3.5V 60 50 40 3.0 3.2 3.4 3.6 Vin (V) 3.8 4.0 4.2 Vf = 3.3V Vf = 3.1V Vf = 3.0V 3.0 3.2 3.4 3.6 Vin (V) 3.8 4.0 4.2 Figure 3. Torch Mode Efficiency Figure 4. Flash Mode Efficiency EN EN Vout Ch1 = EN Vout Ch2 = Vout Iin 0.5A/div Ch4 = Iin (0.5A/div) Iin 0.5A/div Figure 5. Startup 150mA Torch, Vin=3.6V, Vout=3.1V. Figure 6. Startup 400mA Flash, Vin=3.6V, Vout=3.5V. Ch1 = Vin (AC) 50mV/div Vin Vin Ch2 = Vout (AC) 50mV/div Vout Vout Figure 7. Ripple 150mA Torch, Vin=4.2V, Vout=3.1V. Cin=4.7uF, CFC=0.47uF, Cout=2.2uF. Figure 8. Ripple 400mA Flash, Vin=3.6V, Vout=3.5V Cin=4.7uF, CFC=0.47uF, Cout=2.2uF. 2 EVALUATION BOARD LAYOUT FIGURE 9: SP6686EB COMPONENT PLACEMENT FIGURE 10: SP6686EB PC LAYOUT TOP SIDE FIGURE 11: SP6686EB PC LAYOUT BOTTOM SIDE 3 TABLE1: SP6686EB LIST OF MATERIALS Part Reference U1 CIN CF COUT RSET RSENSE Part Number SP6686ER GRM188R60J475KE19D GRM155R60J105KE19B GRM188R60J225KE19D Value 4.7uF/6.3V 0.47uF/6.3V 2.2uF/6.3V 106K 0.33ohms Size 3x3mm DFN - 10 pin 0603/X5R/0.9mm ht 0402/X5R/0.5mm ht 0603/X5R/0.9mm ht 0402 0603 Manufacturers/ Website Sipex/www.sipex.cpm Murata/www.murata.com Murata/www.murata.com Murata/www.murata.com Rohm www.rohm.com Cyntec www.cyntec.com Cyntec www.cyntec.com ORDERING INFORMATION Model Temperature Range Package Type SP6686EB............................. ......-40C to +85C...................SP6686EB Evaluation Board SP6686ER.....................................-40C to +85C...................................... 10-pin 3x3 DFN 4 |
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