DEMO MANUAL DC1547B LT3757AEDD High Efficiency Boost Converter Description Demonstration circuit 1547B features the LT®3757AEDD in a 400kHz BOOST converter circuit, designed for a 12V output from a 3.1V to 9V input voltage range. such as soft-start, input undervoltage lockout, adjustable frequency and synchronization in a small 10-lead MSOP package or a 3mm × 3mm QFN package. The LT3757A operates over an input range of 2.9V to 40V, suitable for applications from single-cell lithium-ion battery portable electronics up to high voltage automotive and industrial power supplies. It also exhibits low shutdown quiescent current of 1µA, making them an ideal fit for battery-operated systems. Thanks to a novel FBX pin architecture, the LT3757A can be connected directly to a divider from either the positive output or the negative output to ground. It also packs many popular features The LT3757A data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 1547B. Design files for this circuit board are available at http://www.linear.com/demo/DC1547B L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Performance Summary Specifications are at TA = 25°C PARAMETER CONDITIONS Input Voltage Range Output Voltage MIN TYP 3.1 11.64 Maximum Output Current 1.5 Switching Frequency 360 12 MAX UNITS 9 V 12.36 V A 400 440 kHz dc1547bf 1 DEMO MANUAL DC1547B Quick Start Procedure Demonstration circuit 1547B is easy to set up to evaluate the performance of the LT3757AEDD. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: NOTE. When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VIN or VOUT and GND terminals. See Figure 2 for proper scope probe technique. 1. Place JP1 on the ON position. + IIN – 3. Turn on the power at the input. NOTE. Make sure that the input voltage does not exceed the maximum input voltage. 4. Check for the proper output voltages. NOTE. If there is no output, temporarily disconnect the load to make sure that the load is not set too high. Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. – + SUPPLY POWER 2. With power off, connect the input power supply to VIN and GND. + VIN – + IOUT + – – + VOUT LOAD – Figure 1. Proper Measurement Equipment Setup 2 dc1547bf DEMO MANUAL DC1547B Quick Start Procedure VIN GND Figure 2. Measuring Input or Output Ripple 100 98 EFFICIENCY (%) 96 94 92 90 88 86 84 82 80 100 300 500 700 900 1100 1300 1500 LOAD CURRENT (mA) DC1547B F03 Figure 3. Boost Converter Efficiency at 5VIN dc1547bf 3 DEMO MANUAL DC1547B Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 4 C1, C3, C4, C5 CAP., X5R, 22µF, 16V, 20%, 1210 Murata, GRM32ER61C226KE20L 2 1 C10 CAP., X5R, 4.7µF, 10V, 20%, 0805 Taiyo Yuden, LMK212BJ475MG-T 3 1 C11 CAP., X7R, 4.7nF, 50V, 10%, 0603 TDK, C1608X7R1H472K080AD 4 1 C12 CAP., C0G, 100pF, 50V, 5%, 0603 TDK, C1608C0G1H101J080AA 5 1 C13 CAP., X7R, 0.1µF, 25V, 10%, 0603 TDK, C1608X7R1E104K080AA 6 1 D1 DIODE, 2A SMT SCHOTTKY BARRIER PowerDI123 DIODES INC., DFLS220L-7 7 1 L1 INDUCTOR, 2.2µH 20% VISHAY, IHLP4040DZER2R2M01 8 1 Q1 SILICON N-CHANNEL POWER MOS FET, LFPAK RENESAS., RJK0328DPB-01#J0 9 1 R1 RES., CHIP, 130k, 1/10W, 1%, 0603 VISHAY, CRCW0603130KFKEA 10 2 R2, R6 RES., CHIP, 20.0k, 1/10W, 1%, 0603 VISHAY, CRCW060320K0FKEA 11 2 R3, R4 RES., CHIP, 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA 12 1 R5 RES., CHIP, 0.008Ω, 1W, 1%, 0815 THIN FILM, RL3720WT-R008-F 13 1 R7 RES., CHIP, 30.9k, 1/10W, 1%, 0603 VISHAY, CRCW060330K9FKEA 14 1 R8 RES., CHIP, 10k, 1/10W, 5%, 0603 VISHAY, CRCW060310K0JNEA 15 1 R9 RES., CHIP, 0Ω , 1/16W, 0603 VISHAY, CRCW06030000Z0EA 16 1 U1 I.C., LT3757AEDD, DFN 10 (3mm X 3mm) LINEAR TECH., LT3757AEDD#PBF CAP., CE-LX, 100µF, 16V, SIZE 6.6 X 6.6 SUN ELECTRONIC, 16CE100LX Additional Demo Board Circuit Components 1 1 CIN1 Hardware: For Demo Board Only 1 7 E1-E7 TESTPOINT, TURRET, .094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0 2 1 JP1 3 PIN 0.079 SINGLE ROW HEADER SULLINS, NRPN031PAEN-RC 3 1 XJP1 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G 4 dc1547bf GND SYNC VCC E7 E6 JP1 RUN E5 ON OFF 1 3 R8 10K 2 C12 100pF C11 4.7nF R6 20K 0.1uF R7 30.9K C13 100K R4 R3 100K 3 5 4 2 1 9 SS SYNC RT FBX VC SHDN/UVLO U1 LT3757AEDD GND Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 6 7 8 10 Q1 RJK0328DPB R5 0.008 1W 123 5 CUSTOMER NOTICE 4 C10 4.7uF 10V L1 2.2uH THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. D1 DATE: N/A SIZE C5 22uF 16V E4 E3 E2 E1 GND VOUT 12V @ 1.5A GND VIN 3.1V - 9V LT3757AEDD DEMO CIRCUIT 1547B SHEET 1 OF 1 1 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only C4 22uF 16V + CIN1 100uF 16V High Efficiency Boost Converter Thursday, April 16, 2015 IC NO. C3 22uF 16V TECHNOLOGY R2 20.0K 1% R1 130K 1% TITLE: SCHEMATIC DFLS220L-7 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. SENSE GATE INTVcc VIN R9 0 Figure 4. DC1547B Demo Circuit Schematic 11 C1 22uF 16V DEMO MANUAL DC1547B Schematic Diagram dc1547bf 5 DEMO MANUAL DC1547B DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation 6 dc1547bf Linear Technology Corporation LT 0515 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015