SP7685EB

SP7685EB Evaluation Board Manual 2.7V to 4.2V Input Range Typical 200mA Torch or 1000mA 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 SP7685EB Evaluation Board is a compact circuit including the SP7685 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 SP7685 inputs and outputs so that the user can quickly connect and measure electrical characteristics and waveforms. SP7685EB Schematic 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. POWER SUPPLY DATA Rev 02/12/06 SP7685EB Evaluation Board Manual Copyright © 2006 Sipex Corporation 1100 1000 SP7685 Output Current 100 90 80 SP7685 Output Efficiency Output Current (mA) Efficiency (%) 900 800 700 600 500 400 300 200 100 0 3.0 3.2 3.4 3.6 3.8 4.0 4.2 1000mA,Vf=3.31V PWF1 700mA,Vf=3.24V PWF1 700mA,Vf=3.92V AOT 200mA,Torch Mode 70 60 50 40 30 20 10 0 3.0 3.2 3.4 3.6 3.8 4.0 4.2 1000mA,Vf=3.31V PWF1 700mA,Vf=3.18V PWF1 700mA,Vf=3.92V AOT 200mA,Torch Input Voltage (V) Input Voltage (V) Figure 1.Output Current Figure 2. Output Efficiency EN EN Vout Vout VFB Iin 1A/div VFB Iin 1A/div Vin=3.1V Torch Mode 2X Figure 3. Startup 200mA Torch, W/PWF1 Vin=3.6V FlashMode 2X Figure 4. Startup 700mA Flash, W/PWF1 Ch1 = Vin (AC) 100mV/div Ch2 = Vout (AC) 50mV/div Figure 5. Ripple 200mA Torch, Vin=3.6V, W/PWF1 Figure 6. Ripple 700mA Flash, Vin=4.2V, W/PWF1 Rev 02/12/06 SP7685EB Evaluation Board Manual Copyright © 2006 Sipex Corporation Page 2 of 4 EVALUATION BOARD LAYOUT FIGURE 7: SP7685EB COMPONENT PLACEMENT FIGURE 8: SP7685EB PC LAYOUT TOP SIDE FIGURE 9: SP7685EB PC LAYOUT BOTTOM SIDE Rev 02/12/06 SP7685EB Evaluation Board Manual Copyright © 2006 Sipex Corporation Page 3 of 4 TABLE1: SP7685EB LIST OF MATERIALS Part Reference U1 CIN, COUT CF REN RSET RFB SW1 J2 TP(VIN,GND,VOUT&VREF) Part Number SP7685ER GRM21BR60J106KE19L GRM155R60J105KE19B CRCW0603103J CRCW06038062F CRCW0603R220J 7914J-1-000 PTC36SAAN STC02SYAN 0300-11501-4727100 10uF/6.3V 1uF/6.3V 10K 80.6K 0.22ohms Push button Switch 3-Pin Header Shunt Test point female pin Value Size 3x3mm DFN - 10 pin 0805 0402 0603 0603 0603 4.8x5.0mm 0.23x0.12" 0.2x0.1" .042" Dia Manufacturers/ Website Sipex/www.sipex.cpm Murata/www.murata.com Murata/www.murata.com Vishay Vishay Vishay Bourn Inc. Sullins Sullins Mil-Max (digi-key) ORDERING INFORMATION Model Temperature Range Package Type SP7685EB............................. ……-40°C to +85°C...................SP7685EB Evaluation Board SP7685ER.....................................-40°C to +85°C...................................... 10-pin 3x3 DFN Rev 02/12/06 SP7685EB Evaluation Board Manual Copyright © 2006 Sipex Corporation Page 4 of 4