DEMO MANUAL DC1504A LT4180 Virtual Remote Sense Controller DESCRIPTION Demonstration circuit 1504A features the LT4180, a virtual remote sense controller which eliminates the need for remote sense wires to compensate for IR losses in cables and wires, and is used in conjunction with the LT3693 buck converter. The circuit is designed for an input voltage range of 8V to 36V with an output of 5V at 3A. The circuit board has a total wire resistance of 0.4Ω and a voltage drop of 1.2V. The circuit contains five selectable jumpers. JP1 turns the converter ON or Off, JP2-JP4 allow for easy selection of other dither frequency combinations, and PERFORMANCE SUMMARY SYMBOL PARAMETER VIN Input Supply Range VOUT Output Voltage Accuracy Design files for this circuit board are available at http://www.linear.com/demo 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. (TA = 25°C) CONDITIONS MIN TYP 8 VIN = 8V to 36V, ILOAD = 3A VIN = 12V, ILOAD = 3A Ripple fS JP5 enables or disables spread spectrum operation. The LT4180 data sheet gives a complete description of the part, its operation and application information. The data sheet must be read in conjunction with this quick start guide for working on or modifying the demo circuit 1504A. Buck Switching Frequency 4.8V MAX 36 5 5.2V UNITS V V 50 mV 500 KHz QUICK START PROCEDURE Demonstration circuit 1504A is easy to set up to evaluate the performance of the LT4180. Refer to Figure 2 for proper equipment setup and follow the procedure below. When input or output voltage ripple is measured, 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 jumpers in the following position: JP1 On JP2 Low JP3 High JP4 High JP5 Low dc1504af 1 DEMO MANUAL DC1504A QUICK START PROCEDURE 2. With power off, connect the input power supply to VIN and GND. NOTE. If there is no output, temporarily disconnect the load to make sure that the load is not set too high. Apply 8V to input. Once the proper output voltage is established, adjust the input voltage and load within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. Check for the proper output voltage. Vout vs Load 5.09 5.07 5.05 Vout (V) 5.03 12Vin 5.01 4.99 4.97 4.95 0 0.25 0.5 0.75 1 1.25 1.5 1.75 Load (A) 2 2.25 2.5 2.75 3 Figure 1. Output Voltage vs Load dc1504af 2 DEMO MANUAL DC1504A QUICK START PROCEDURE + POWER SOURCE – Figure 2. Proper Equipment Setup GND VOUT Figure 3. Proper Input/Output Ripple Measurement Technique dc1504af 3 DEMO MANUAL DC1504A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER AVX TPSE477M010R0050 Required Circuit Components for DC1504A 1 2 C7, C8 CAP, 7343 470μF 20% 10V TANT 2 1 C10 CAP, 1206 0.47μF 10% 50V X7R TDK C3216X7R1H474K 3 1 C13 CAP, 22μF 50V ALUM SUN ELECT. 50CE22BS 4 1 C14 CAP, 1206 4.7μF 10% 50V X7R MURATA GRM31CR71H475K 5 2 C15, C16 CAP, 1206 47μF 20% 10V X5R TAIYO YUDEN LMK316BJ476ML 6 1 C21 CAP, 1206 0.1μF 10% 50V X7R AVX 12065C104KAT2A 7 2 C22, C23 CAP, 1206 1μF 20% 50V X7R TDK C3216X7R1H105M 8 1 C24 CAP, 1206 4.7nF 5% 100V C0G MURATA GRM3195C2A472JA01D 9 2 C25, C27 CAP, 1206 470pF 5% 100V NP0 AVX 12061A471JAT2A 10 2 C26, C28 CAP, 1206 0.047μF 5% 50V X7R AVX 12065C473JAT 11 1 C29 CAP, 1206 330pF 5% 100V NP0 AVX 12061A331JAT2A 12 1 C30 CAP, 1206 47pF 10% 50V NP0 AVX 12065A470KAT 15 1 D1 DIODE, SCHOTTKY BARRIER RECTIFIER ON SEMI MBRA340T3G 16 1 D2 DIODE, SCHOTTKY SOD323 CENTRAL SEMI. CMDSH-3 TR 20 1 L1 IND, 6.8H SUMIDA CDRH8D43-6R8NC 22 1 R6 RES, 1206 10kΩ 1% 1/4W NIC NRC12F1002TRF 23 1 R7 RES, 1206 68.1kΩ 1% 1/4W NIC NRC12F6812TRF 24 1 R9 RES, 1206 30.1kΩ 1% 1/4W NIC NRC12F3012TRF 26 1 R15 RES, 1206 21.5kΩ 1% 1/4W NIC NRC12F2152TRF 27 1 R19 RES, 1206 1.87kΩ 1% 1/4W NIC NRC12F1871TRF 28 1 R20 RES, 1206 2.15kΩ 1% 1/4W NIC NRC12F2151TRF 29 1 R21 RES, 1206 5.36kΩ 1% 1/4W NIC NRC12F5361TRF 30 1 R23 RES, 1206 22.1kΩ 1% 1/4W NIC NRC12F2212TRF 31 1 R24 RES, 1206 23.2kΩ 1% 1/4W VISHAY CRCW120623K2FKEA 32 1 R25 RES, 1206 0.033 Ω 1% 1/4W VISHAY WSL1206R0330FEA 36 1 R34 RES, 1206 1kΩ 5% 1/4W VISHAY CRCW12061K00JNEA 37 1 U1 IC, STEP-DOWN SWITCHING REGULATOR LINEAR TECH. LT3693EDD 38 1 U2 IC, LINEAR TECH. LT4180EGN Additional Circuit Components for Demo Board Only 25 5 R14, R16, R17, R18, R22 RES, 1206 100kΩ 5% 1/4W VISHAY CRCW1206100KJNEA 34 4 R27, R28, R29, R30 RES, 4527 0.1Ω 5% 2W VISHAY WSR2R1000JEA 33 1 R26 RES, 1206 0Ω JUMPER NIC NRC12ZO CAP, 470μF 35V ALUM OPTION SUN ELECT. 35ME470AX Optional Components 13 0 C31 OPTION 14 0 C33, C34, C35, C36 CAP, 1206 OPTION OPTION 17 0 D3 DIODE, SCHOTTKY SOD323 OPTION CENTRAL SEMI. CMDSH-3 OPTION 21 0 Q1 XSTR, 2N7002 N-CHANNEL MOSFET DIODES/ZETEX 2N7002 OPTION 35 0 R32, R33, R35 RES, 1206 OPTION OPTION 39 0 U3 IC, DUAL SCHMITT-TRIGGER INVERTER OPTION TI SN74LVC2G14DBVT OPTION Hardware for Demo Board Only 18 5 E1, E2, E3, E5, E6 TURRET MILL-MAX 2501-2-00-80-00-00-07-0 19 5 JP1, JP2, JP3, JP4, JP5 HEADER, 3-PIN 2mm SAMTEC TMM-103-02-L-S 40 5 JP1, JP2, JP3, JP4, JP5 SHUNT SAMTEC 2SN-BK-G dc1504af 4 DEMO MANUAL DC1504A SCHEMATIC DIAGRAM dc1504af 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. 5 DEMO MANUAL DC1504A 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 dc1504af 6 Linear Technology Corporation LT 0711 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2011