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 SP7685 Output Current SP7685 Output Efficiency 100 90 900 800 700 80 Efficiency (%) Output Current (mA) 1100 1000 1000mA,Vf=3.31V PWF1 600 500 700mA,Vf=3.24V PWF1 700mA,Vf=3.92V AOT 400 300 200 200mA,Torch Mode 70 60 50 40 1000mA,Vf=3.31V PWF1 30 700mA,Vf=3.18V PWF1 20 700mA,Vf=3.92V AOT 10 100 0 200mA,Torch 0 3.0 3.2 3.4 3.6 3.8 4.0 4.2 3.0 3.2 3.4 3.6 3.8 4.0 4.2 Input Voltage (V) Input Voltage (V) Figure 1.Output Current Figure 2. Output Efficiency EN EN Vout Vout VFB VFB Iin 1A/div Iin 1A/div Vin=3.1V Torch Mode 2X Vin=3.6V FlashMode 2X Figure 3. Startup 200mA Torch, W/PWF1 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 Rev 02/12/06 Figure 6. Ripple 700mA Flash, Vin=4.2V, W/PWF1 SP7685EB Evaluation Board Manual Page 2 of 4 Copyright © 2006 Sipex Corporation 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 Page 3 of 4 Copyright © 2006 Sipex Corporation TABLE1: SP7685EB LIST OF MATERIALS Part Reference Part Number Value Size Manufacturers/ Website 3x3mm DFN - 10 pin Sipex/www.sipex.cpm U1 SP7685ER CIN, COUT GRM21BR60J106KE19L 10uF/6.3V 0805 Murata/www.murata.com CF GRM155R60J105KE19B 1uF/6.3V 0402 Murata/www.murata.com REN CRCW0603103J 10K 0603 Vishay RSET CRCW06038062F 80.6K 0603 Vishay RFB CRCW0603R220J 0.22ohms 0603 Vishay SW1 7914J-1-000 Push button Switch 4.8x5.0mm Bourn Inc. PTC36SAAN 3-Pin Header 0.23x0.12" Sullins STC02SYAN 0300-11501-4727100 Shunt Test point female pin 0.2x0.1" .042" Dia Sullins Mil-Max (digi-key) J2 TP(VIN,GND,VOUT&VREF) 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 Page 4 of 4 Copyright © 2006 Sipex Corporation