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| SP6685EB Evaluation Board Manual 2.7V to 4.2V Input Range Typical 200mA Torch or 700mA 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 SP6685EB Evaluation Board is a compact circuit including the SP6685 in 3x3mm DFN and 3 small 0603 capacitors which can provide a stable drive current for a 1W LED such as the 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 SP6685 inputs and outputs so that the user can quickly connect and measure electrical characteristics and waveforms. SP6685EB Schematic Vin: 2.7-5.5V Cin 10uF CF 1uF 1 2 3 4 5 VIN C1 C2 SP6685 VOUT PGND SGND FB RSET 10 9 8 7 6 Cout 4.7uF D1 PWF1 Flas h/Torch ENABLE FLASH EN VFB = 50mV Torch 200mA 150mV Flash 700mA RSET 88.7K RSENSE 0.22ohms 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 02/23/05 SP6685EB Evaluation Board Manual Copyright 2005 Sipex Corporation POWER SUPPLY DATA 300 Torch M ode 200mA Iout 900 800 700 Flash Mode 700mA Iout 200 Iout (mA) 600 Iout (mA) Vf = 3.0V Vf = 3.3V 100 Vf = 3.6V Vf = 3.9V 500 400 300 200 100 Vf = 3.3V Vf = 3.6V Vf = 3.9V Vf = 4.2V 0 3.0 3.2 3.4 3.6 Vin (V) 3.8 4.0 4.2 0 3.0 3.2 3.4 3.6 Vin (V) 3.8 4.0 4.2 Figure 1. Torch Mode Output Current 100 90 Efficiency (%) Figure 2. Flash Mode Output Current 100 90 Efficiency (%) 80 70 60 50 40 Torch Mode 200mA Efficiency Flash M ode 700mA Efficiency Vf = Vf = Vf = Vf = 3.3V 3.6V 3.9V 4.2V 80 70 60 50 40 3.0 3.2 3.4 Vf = Vf = Vf = Vf = 3.0V 3.3V 3.6V 3.9V 3.6 Vin (V) 3.8 4.0 4.2 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 Ch1 = EN Ch2 = Vout Ch4 = Iin (0.5A/div) Figure 5. Startup 200mA Torch, Vin=3.6V, Vout=3.0V. Figure 6. Startup 700mA Flash, Vin=3.6V, Vout=3.3V. Ch1 = Vin (AC) 50mV/div Ch2 = Vout (AC) 50mV/div Figure 7. Ripple 200mA Torch, Vin=3.6V, Vout=3.15V. Figure 8. Ripple 700mA Flash, Vin=3.6V, Vout=3.35V. 2 EVALUATION BOARD LAYOUT FIGURE 9: SP6685EB COMPONENT PLACEMENT FIGURE 10: SP6685EB PC LAYOUT TOP SIDE FIGURE 11: SP6685EB PC LAYOUT BOTTOM SIDE 3 TABLE1: SP6685EB LIST OF MATERIALS Part Reference U1 CIN CF COUT RSET RSENSE Part Number SP6685ER GRM21BR60J106KE19L GRM155R60J105KE19B GRM188R0J475KE19 Value 10uF/6.3V 1uF/6.3V 4.7uF/6.3V 88.7K 0.22ohms Size 3x3mm DFN - 10 pin 0805/X5R/1.35mm 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 SP6685EB............................. ......-40C to +85C...................SP6685EB Evaluation Board SP6685ER.....................................-40C to +85C...................................... 10-pin 3x3 DFN 4 |
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