SP7686AER

Solved by SP7686A TM Evaluation Board Manual 2.7V to 5.5V Input Range Typical 150mA Torch or 450mA Flash Output Current High Efficiency in 1X mode, high VOUT in 2X mode Small 3x2mm 8-Pin DFN Package 2.4MHz Switching Frequency Enables Small Components Integrated Design with Minimal Components. Use with 1 cell Lithium Ion Battery DESCRIPTION The SP7686AEB Evaluation Board is a compact circuit including the SP7686A in 3x2mm 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 SP7686A inputs and outputs so that the user can quickly connect and measure electrical characteristics and waveforms. SCHEMATIC 10uF 2.2uF Jun13-07 SP7686A Evaluation Board Manual Page 1 of 5 © 2007 Sipex Corporation 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 J1 corresponding position. 3. Apply High to ON terminal (SW1) or EN Pin (J2) to turn the LED on. POWER SUPPLY DATA Flash Mode Output Current 500 400 300 200 100 Ci=10uF,CF=0.22uF,Co=2.2u 0 2.7 3.0 3.3 3.6 3.9 4.2 Ci=4.7uF,CF=0.22uF,Co=1uF Ci=4.7,CF=1uF,Co=1uF 500 450 Flash Mode Output Current Iout (m A) Iout (mA) 400 350 300 250 200 2.7 3.0 3.3 3.6 3.9 4.2 PWF1 Vf=3.08V AOT Vf=3.43V Vin (V) Vin (V) Figure 1. Flash Mode Output Current with PWF1 LED T orch Mode Output Current 300 250 Figure 2. Flash Mode Output Current Efficiency 100 90 Efficiency (%) 80 70 60 50 40 30 Flash 450mA Torch 150mA Iout (mA) 200 150 100 50 0 2.70 3.00 3.30 3.60 3.90 4.20 Ci=4.7uF,CF=0.22uF,Co=1uF Ci=4.7,CF=1uF,Co=1uF Ci=10uF,CF=0.22uF,Co=2.2uF 2.7 3.0 3.3 Vin (V) 3.6 3.9 4.2 Vin (V) Figure 3. Torch Mode Output Current with PWF1 LED EN Vout Figure 4. Output Efficiency with PWF1 EN Vout VFB Iin: 0.5A/div VFB Iin: 1A/div Figure 5. Startup 150mA Torch,Vin=4.2V. Figure 6. Startup 450mA Flash, Vin=3.4V Jun13-07 SP7686A Evaluation Board Manual Page 2 of 5 © 2007 Sipex Corporation Vout Vin Vout VFB VFB Figure 7. Ripple 150mA Torch, Vin=4.2V, 1X Mode Figure 8. Ripple 450mA Flash, Vin=4.2V, 1X Mode EVALUATION BOARD LAYOUT FIGURE 9: SP7686AEB COMPONENT PLACEMENT Jun13-07 SP7686A Evaluation Board Manual Page 3 of 5 © 2007 Sipex Corporation FIGURE 10: SP7686AEB PC LAYOUT TOP SIDE FIGURE 11: SP7686AEB PC LAYOUT BOTTOM SIDE TABLE1: SP7686AEB LIST OF MATERIALS Part Reference U1 CIN COUT CF REN RFB SW1 J1 TP(VIN,GND,VOUT&VFB) Part Number SP7686AER GRM188R60J106M GRM188R61A225K GRM155R60J224K CRCW060310K0J CRCW0603R330F 7914J-1-000 61303611121 60900213421 0300-11501-4727100 Value Size 3x2mm DFN - 8 pin Manufacturers/ Website www.sipex.cpm www.murata.com www.murata.com www.murata.com www.vishay.com www.vishay.com Bourn Inc. www.we-online.com www.we-online.com Mil-Max (digi-key) 10uF/6.3V/X5R 2.2uF/10V/X5R 0.22uF/6.3V/X5R 10K/1% 0.33 Ω/1% Ω/1% Push button Switch 3-Pin 2.54mm Header 2.54mm Jumper Test point female pin 0603 0603 0402 0603 0603 4.8x5.0mm 6.0x2.54mm 5.0x2.54mm .042" Dia Jun13-07 SP7686A Evaluation Board Manual Page 4 of 5 © 2007 Sipex Corporation ORDERING INFORMATION Model Temperature Range Package Type SP7686AEB............................. ……-40°C to +85°C......................SP7686AEB Evaluation Board SP7686AER.....................................-40°C to +85°C............................................... 8-pin 3x2 DFN For further assistance: Email: WWW Support page: Sipex Application Notes: Sipexsupport@sipex.com http://www.sipex.com/content.aspx?p=support http://www.sipex.com/applicationNotes.aspx Solved by TM Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA95035 tel: (408) 934-7500 fax: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Jun13-07 SP7686A Evaluation Board Manual Page 5 of 5 © 2007 Sipex Corporation