SP6685EB MaxLinear

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 V in 2X mode OUT 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 SP6685 1 10 Cin VIN VOUT Cout D1 2 9 4.7uF 10uF CF C1 PGND PWF1 1uF 3 8 C2 SGND 4 7 Flash/Torch FLASH FB 5 6 VFB = 50mV Torch 200mA ENABLE EN RSET 150mV Flash 700mA RSET RSENSE 88.7K 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 Torch Mode 200mA Iout Flash Mode 700mA Iout 300 900 800 700 200 600 500 Vf = 3.0V Vf = 3.3V Vf = 3.3V 400 Vf = 3.6V Vf = 3.6V 100 300 Vf = 3.9V Vf = 3.9V 200 Vf = 4.2V 100 0 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 Vin (V) Vin (V) Figure 1. Torch Mode Output Current Figure 2. Flash Mode Output Current Torch Mode 200mA Efficiency Flash Mode 700mA Efficiency 100 100 Vf = 3.3V 90 90 Vf = 3.6V Vf = 3.9V 80 80 Vf = 4.2V Vf = 3.0V Vf = 3.3V 70 70 Vf = 3.6V Vf = 3.9V 60 60 50 50 40 40 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 Vin (V) Vin (V) 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 Efficiency (%) Iout (mA) Efficiency (%) Iout (mA)