DEMO MANUAL DC2056A LTC3637EMSE High Efficiency 76V, 1A Step-Down Converter DESCRIPTION Demonstration circuit 2056A is a 76V input, 1A output DC/DC power supply featuring the LTC(R)3637. The IC operates in a high efficiency Burst Mode(R) operation and includes an internal high side power MOSFET. The board will accept an input voltage between 4V and 76V, and provide jumper selected output voltages of 1.8V, 3.3V, 5V and an option for additional voltages. The IC includes internal soft-start and a provision for increasing soft-start time. Included on the board is an ON/OFF jumper that can also be configured as a precision undervoltage lockout. PERFORMANCE SUMMARY PARAMETER Output voltage between 800mV and VIN can be programmed using optional resistors. (Higher voltage rating output capacitors may be required.) The LTC3637 data sheet gives a complete description of the IC operation and application information. The data sheet must be read in conjunction with this quick start guide. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25C CONDITION Input Voltage Range VALUE 4V to 76V 1.8V Output Voltage VIN = 12V, IOUT = 0A to 1A 1.8V 2% 3.3V Output Voltage VIN = 12V, IOUT = 0A to 1A 3.3V 2% 5V Output Voltage VIN = 12V, IOUT = 0A to 1A 5V 2% Maximum Output Current, IOUT VIN = 4V to 76V, VOUT = 1.8V, 3.3V or 5V 1A Typical Efficiency VIN = 12V, VOUT = 5V, IOUT = 1A 85.5% Typical Output Ripple VIN = 76V, VOUT = 5V, IOUT = 1A (20MHz BW) 109mVP-P dc2056af 1 DEMO MANUAL DC2056A QUICK START PROCEDURE Demonstration circuit 2056A is easy to set up to evaluate the performance of the LTC3637. Refer to Figure 1 for the proper measurement equipment setup and follow the procedure below: 7. With power off, move jumpers JP1 and JP2 to the other fixed voltage settings (1.8V or 3.3V). Repeat steps 5 and 6. Check for the proper out-put voltage and other parameters. 1. With power off, connect the input power supply (set for 0V) to VIN and GND (input return). Note: When measuring the output or input voltage ripple, do not use the long ground lead on the oscilloscope probe. See Figure 2 for the proper scope probe technique. Short, stiff leads need to be soldered to the (+) and (-) terminals of an output capacitor. The probe's ground ring needs to touch the (-) lead and the probe tip needs to touch the (+) lead. 2. Select 5V output using jumper JP1 (B position) and JP2 (A position). Select ON position for JP3. 3. Connect the 5V output load between VOUT and GND (Initial load: no load). 4. Connect the DVMs to the input and outputs. 5. Turn on the input power supply and slowly increase to 12V. Check for the proper output voltages. (5V output should be within 5V 2%.) 6. Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage and other parameters. Additional Notes 1. CAUTION: Be careful when testing with high voltage. High voltage can result in an electric shock if care is not taken. 2. For 5V output, VIN input voltage should be at least 5V or higher. dc2056af 2 DEMO MANUAL DC2056A QUICK START PROCEDURE Figure 1. Proper Measurement Equipment Setup + VOUT COUT - GND dc2056af 3 DEMO MANUAL DC2056A QUICK START PROCEDURE LTC3637 3.3VOUT Efficiency vs Load Current LTC3637 1.8VOUT Efficiency vs Load Current dc2056af 4 DEMO MANUAL DC2056A QUICK START PROCEDURE LTC3637 5VOUT Efficiency vs Load Current dc2056af 5 DEMO MANUAL DC2056A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C1 CAP, 47F 20% 100V ALUM NIPPON CHEMI-CON EMVY101ARA470MKE0S 2 1 C2 CAP, 2220 4.7F 20% 100V X7R TDK C5750X7R2A475M 3 1 C3 CAP, 0603 47pF 5% 50V C0G AVX 06035A470JAT2 4 1 C4 CAP, 0603 47nF 10% 25V X7R AVX 06033C473KAT 5 2 C6, C7 CAP, 1210 100F 20% 10V X5R MURATA GRM32ER61A107ME20L 6 1 C9 CAP, 0603 0.1F 10% 25V X7R AVX 06033C104KAT2A 7 1 D1 DIODE, SUPER BARRIER RECTIFIER DIODES INC. SBR3U100LP 8 1 L1 IND, 10H 30% 4.45A SMD SUMIDA CDRH105RNP-100NC 9 1 R1 RES, 0603 1M 5% 1/10W NIC NRC06J105TRF 10 1 R4 RES, 0603 255k 1% 1/10W VISHAY CRCW0603255KFKEA 11 2 R5, R6 RES, 0603 0 JUMPER VISHAY CRCW06030000Z0EA 12 1 U1 IC, HIGH EFFICIENCY STEP-DOWN CONVERTER LINEAR TECH. LTC3637EMSE Additional Demo Board Circuit Components 1 0 C8, C10, C11 CAP, 1210 OPTION OPTION 2 0 R2, R3, R7 RES, 0603 OPTION OPTION 1 5 E1, E2, E3, E4, E5 TURRET MILL MAX 2501-2-00-80-00-00-07-0 2 3 JP1, JP2, JP3 HEADER, 3-PIN, 2mm SAMTEC TMM-103-02-L-S 3 3 JP1, JP2, JP3 SHUNT, 2mm SAMTEC 2SN-BK-G Hardware dc2056af 6 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. A B C D E5 E4 + C1 47uF 100V VIN R5 0 OPT R3 R2 OPT R1 1M OFF ON 2 JP3 1% R4 255K 3 1 C3 47pF C2 4.7uF 100V 2220 VIN B A A B A 3.3V 5.0V EXT. R A B B 1.8V JP2 JP1 VOUT 5 3. FOR 5VOUTPUT, VIN RANGE IS 6V - 76V. 2. 3 11 5 12 14 SS VPRG2 VPRG1 VFB SW 10 6 7 9 1 3 2 B A 2 B A 1 1 JP2 4 3 R7 OPT 1 REV C6 100uF 10V 1210 VOUT 2 N/A C7 100uF 10V 1210 PROD C10 OPT 1210 C11 OPT 1210 11/04/13 DATE 1 2 E3 1 1 LTC3637EMSE DEMO CIRCUIT 2056A 11/04/13 12:46:41 E2 VOUT GND 1.8V/3.3V/5V 1A C9 0.1uF HIGH EFFICIENCY, 76V, 1A STEP-DOWN CONVERTER APPROVED CHARLIE Z. 1 1 C8 OPT 1210 DESCRIPTION REVISION HISTORY TECHNOLOGY R6 0 JP1 C4 47nF 3 3 D1 SBR3U100LP CDRH105R L1 10uH ECO ISET FBO OVLO RUN VIN U1 LTC3637EMSE 1. ALL RESISTORS AND CAPACITORS ARE 0603. NOTE: UNLESS OTHERWISE SPECIFIED FBO GND 4V - 76V VIN E1 4 GND 8 GND 16 GND 17 5 A B C D DEMO MANUAL DC2056A SCHEMATIC DIAGRAM dc2056af 7 DEMO MANUAL DC2056A 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 (c) 2004, Linear Technology Corporation dc2056af 8 Linear Technology Corporation LT 0214 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2014