DEMO MANUAL DC2052A LTC3880EUJ/LTC3883EUH 3-Phase Step-Down DC/DC Controller with Power System Management DESCRIPTION Demonstration circuit 2052A is a 3-phase single output synchronous buck converter featuring the LTC3880EUJ, a dual-phase current mode controller, and the LTC3883EUH, a single-phase current mode controller with input current sensing capability. Both the LTC®3880 and LTC3883 have a PMBus interface and the power system management functions. The layout of DC2052A is very compact with the total solution within a 1.1 inch by 1.2 inch area for LTC3880, and 1.1 inch by 0.35inch for LTC3883. The input voltage range of this board is from 6.5V to 14V. The output voltage can be programmed from 0.5V to 1.8V, with an output current of up to 60A total. The factory default setting for the output voltage is 1.0V. The DC2052A also has an onboard pulse generator circuit and the dynamic load circuit which make it easy for the customer to evaluate the transient performances. The DC2052A powers up to default settings and produces power based on configuration resistors or the non-volatile memory settings (NVM) without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive digital power management features of these parts, download the GUI software LTpowerPlay™ onto your PC and use LTC’s I2C/SMBus/PMBus Dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on the fly and store the configuration in EEPROM, view telemetry of voltage, current, temperature and fault status. GUI Download The software can be downloaded from: http://www.linear.com/ltpowerplay For more details and instructions of LTpowerPlay, please refer to “LTpowerPlay for LTC3880 Quick Start Guide.” 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 and LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY Specifications are at TA = 25°C SYMBOL PARAMETER CONDITIONS VIN Input Supply Range VOUT Output Voltage Range IOUT Output Current Range FSW Factory Default Switching EFF Peak Efficiency IOUT = 0A to 60A, VIN = 6.5V to 14V MIN TYP UNITS 6.5 12 14 V 0.5 1.0 1.8 V 60 A 0 VOUT = 1.0V, See Figure 4 MAX 350 kHz 87.5 % dc2052af 1 DEMO MANUAL DC2052A QUICK START PROCEDURE Demonstration circuit 2052A makes it easy to set up and evaluate the performance of the LTC3880 and the LTC3883. Refer to Figure 2 for proper measurement equipment setup and follow the procedure below: 3. Make sure the RUN switch (SW) is OFF. 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 output voltage ripple by touching the probe tip directly across the C16. See Figure 3 for proper scope probe technique. 5. Turn on the RUN switch as desired. 1. Make sure jumpers are in the following positions: JUMPER POSITION FUNCTION JP1 OFF EXTVCC_DRV – External VCC for LTC3880/LTC3883-1 JP2 OFF LED Indicator JP3 OFF Pulse Generator 2. With power off, connect the input power supply to VIN and GND. Connect active load to the output. 4. Turn on the power at the input. Note: Make sure that the input voltage does not exceed 16V. 6. Check for the correct output voltage from E3 to E4. VOUT = 1.0V ±0.5% (1.005V ~ 0.995V) Note: If there is no output, temporarily disconnect the load to make sure that the load is not set too high. 7. Once the proper output voltage is established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. 8. Connect the dongle and control the output voltages from the GUI. See “LTpowerPlay QUICK START” session for details. Figure 1. Demo Setup with PC dc2052af 2 DEMO MANUAL DC2052A QUICK START PROCEDURE Figure 2. Power Test Setup + VOUT – COUT GND Figure 3. Measuring Output Voltage Ripple dc2052af 3 DEMO MANUAL DC2052A QUICK START PROCEDURE Connecting a PC to DC2052A Evaluating the DC2052A When VIN is Below 6.0V You can use a PC to reconfigure the power management features of the LTC3880 and the LTC3883 such as: nominal VOUT, margin set points, OV/UV limits, temperature fault limits, sequencing parameters, the fault log, fault responses, GPIO and other functionality. The DC1613A dongle may be plugged in regardless of whether or not VIN is present. Dongle can be hot plugged. For applications that the input voltage is within 4.5V to 6.0V, please install R5 to connect VIN directly to INTVCC. Please be aware that in this case VIN cannot exceed 6.0V otherwise the chip will be damaged. Combining DC2052A with Other Digital Power Demo Boards The DC2052A may be plugged together in a multiboard array with other LTC power system management boards using J6 and J8. Measuring Efficiency (See Figure 4) To accurately measure efficiency of any configuration, do the following: Evaluating the LTC3880-1 and LTC3883-1 For applications that require the highest possible efficiency, the LTC3880-1 and LTC3883-1 allow the user to supply the bias voltage and gate driver current from an external power supply. Connect the external power supply, 4.8V to 5.2V, to the EXTVCC pin. To use the onboard LDO to drive INTVCC, make the following modifications to the demo board: • Set JP1 to ON so that U4 provides the 5V drive to INTVCC. U4 takes the place of the external power supply. • Install R53, R54. • Set JP1, JP2, JP3 to OFF position to disable all the auxiliary circuits. To accurately measure efficiency of a demo board containing the LTC3880-1 and the LTC3883-1, • Make sure R53, R54 are not stuffed. • Drive INTVCC from an external source through the pin named: EXTVCC. • Measure VIN across the input ceramic capacitor (C28). Measure VOUT across the output ceramic capacitor (C32). • Set JP1 to OFF to disable the LDO. • Measure VIN across the input ceramic capacitor (C28). Measure VOUT across the output ceramic capacitor (C32). Measuring Output Ripple Voltage An accurate ripple measurement may be performed by using the below configuration across C16. Figure 4. Typical Efficiency Curves DC2052A, 12VIN, FSW = 350kHz, VOUT = 1.0V,1.2V,1.5V dc2052af 4 DEMO MANUAL DC2052A LTpowerPlay SOFTWARE GUI LTpowerPlay is a powerful Windows-based development environment that supports Linear Technology power system management ICs, including the LTC3880, LTC3883, LTC2974 and LTC2978. The software supports a variety of different tasks. You can use LTpowerPlay to evaluate Linear Technology ICs by connecting to a demo board system. LTpowerPlay can also be used in an offline mode (with no hardware present) in order to build a multichip configuration file that can be saved and reloaded at a later time. LTpowerPlay provides unprecedented diagnostic and debug features. It becomes a valuable diagnostic tool during board bring-up to program or tweak the power management scheme in a system, or to diagnose power issues when bringing up rails. LTpowerPlay utilizes the DC1613A USB-to-SMBus controller to communicate with one of many potential targets, including the LTC3880 and the LTC3883’s DC2052A demo system, or a customer board. The software also provides an automatic update feature to keep the software current with the latest set of device drivers and documentation. The LTpowerPlay software can be downloaded from: http://linear.com/ltpowerplay To access technical support documents for LTC Digital Power Products visit Help. View online help on the LTpowerPlay menu. Figure 5. LTpowerPlay Main Interface dc2052af 5 DEMO MANUAL DC2052A LTpowerPlay QUICK START PROCEDURE The following procedure describes how to use LTpowerPlay to monitor and change the settings of LTC3880 and LTC3883. 1. Download and install the LTPowerPlay GUI: c. In the Toolbar, click the “R” (RAM to PC) icon to read the RAM from the LTC3880 and the LTC3883. This reads the configuration from the RAM of LTC3883 and loads it into the GUI. http://linear.com/ltpowerplay 2. Launch the LTpowerPlay GUI. a. The GUI should automatically identify the DC2052A. The system tree on the left hand side should look like this: d. If you want to change the output voltage to a different value, like 1.5V. In the Config tab, type in 1.5 in the VOUT_COMMAND box, like this: b. A green message box shows for a few seconds in the lower left hand corner, confirming that the LTC3880 and the LTC3883 are communicating: dc2052af 6 DEMO MANUAL DC2052A LTpowerPlay QUICK START PROCEDURE Then, click the “W” (PC to RAM) icon to write these register values to the LTC3880 and the LTC3883. After finishing this step, you will see the output voltage will change to 1.5V. If the write is successful, you will see the following message: e. You can save the changes into the NVM. In the tool bar, click “RAM to NVM” button, as following f. Save the demo board configuration to a (*.proj) file. Click the Save icon and save the file. Name it whatever you want. dc2052af 7 DEMO MANUAL DC2052A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURE/PART NUMBER Required Circuit Components 1 6 C1, C2, C27, C28, C44, C45 CAP., X5R, 22μF, 25V, 10%, 1210 MURATA GRM32ER61E226KE15L 2 2 C3, C40 CAP., X7R, 4.7μF,16V, 10%, 0603 TDK C1608X5R1C475K 3 2 C4, C5 CAP., OS-CON, 330μF, 16V, 20% SANYO, 16SVP330M 4 1 C6 CAP., X7R, 100nF, 25V, 10%, 0603 AVX 06033C104KAT2A 5 3 C21, C29, C47 CAP., X7R, 100nF, 25V, 10%, 0402 AVX 04023D104KAT2A 6 6 C7, C8, C14, C36, C41, C53 CAP., X5R, 1μF, 10V, 20%, 0402 AVX 0402ZD105KAT2A 7 2 C38, C39 CAP., X5R, 1μF, 10V, 20%, 0603 TAIYO YUDEN EMK107BJ105KA 8 18 C9, C10, C11, C12, C13, C30, C31, C32, C33, C34, C35, C48, C49, C50, C51, C52, C71, C72 CAP., X5R, 100μF, 6.3V, 20%,1210 AVX 12106D107MAT2A 9 6 C16, C17, C18, C19, C20, C74 CAP., POSCAP, 470μF, 2.5V SANYO, 2R5TPE470M9 10 3 C22, C37, C54 CAP., POSCAP, 470μF, 2.5V AVX 0402YD104KAT2A 11 1 C23 CAP., X7R, 1000pF, 25V, 10%, 0603 AVX 06033A102KAT2A 12 3 C24, C26, C55 CAP., X5R, 10nF, 25V, 10%, 0402 AVX 04023C103KAT2A 13 1 C56 CAP., X5R, 100pF, 25V, 10%, 0603 AVX 06033A101JAT2A 14 1 C25 CAP., NPO, 47pF,25V, 10%, 0603 AVX 06033A470JAT2A 15 1 C42 CAP., X5R, 0.1μF, 10V, 20%, 0603 AVX 0603ZC104MAT2A 16 2 C43, C46 CAP., X7R, 0.01μF,16V, 10%, 0402 AVX 0402YC103KAT2A 17 3 D1, D2, D3 DIODE, SCHOTTKY, SOD-323 CENTRAL CMDSH-3TR 18 3 L1, L2, L3 INDUCTOR, SMT POWER IND. 0.3μH COILCRAFT., XAL7070-301ME 19 3 Q1, Q4, Q5 DUAL N-CHANNEL MOSFET 25V FAIRCHILD FDMS3620S 20 7 Q2, Q3, Q6 TRANS GP SS PNP 40V SOT-416 ON SEMI MMBT3906TT1 21 2 R1, R81 RES., CHIP, 2Ω, 1%, 0603 YAGEO RC0603FR-072RL 22 3 R2, R4, R6 RES., CHIP, 10k, 1%, 0603 NIC NRC06F1002TRF 23 3 R3, R17, R24 RES., CHIP, 10k, 1%, 0402 VISHAY CRCW040210K0FKED 24 6 R7, R8, R18, R19, R44, R45 RES., CHIP, 2.61k, 1%, 0402 VISHAY CRCW04022K61FKED 25 9 R11, R12, R35, R39, R43, R49, R51, R52, R56 RES., CHIP, 0Ω, 1%, 0603 VISHAY CRCW06030000Z0ED 26 6 R10, R14, R15, R22, R38, R94 RES., CHIP, 0Ω, 1%, 0402 VISHAY CRCW04020000Z0ED 27 1 R13 RES., CHIP, 4.53k, 1%, 0603 YAGEO RC0603FR-074K53L 28 2 R25, R26 RES., CHIP, 100Ω, 1%, 0402 VISHAY CRCW0402100RFKED 29 2 R40, R46 RES., CHIP, 4.99k, 1%, 0402 VISHAY CRCW04024K99FKEA 30 1 U1 IC, LTC3880EUJ, QFN 6mm x 6mm LINEAR TECH., LTC3880EUJ#0125-1PBF 31 1 U2 IC, LTC3883EUH, QFN 5mm x 5mm LINEAR TECH., LTC3883EUH#0126-1PBF Additional Circuit Components 1 2 C60, C64 CAP., X7R, 4.7μF,16V, 10%, 0603 TDK C1608X5R1C475K 2 1 C59 CAP., X7R, 100nF, 25V, 10%, 0603 AVX 06033C104KAT2A 3 1 C70 CAP., X5R, 1μF, 10V, 20%, 0805 AVX 0805ZD105KAT2A 4 4 C61, C62, C65, C67, C68 CAP., X5R, 1μF, 10V, 20%, 1206 AVX 1206YD105KAT2A 5 0 C15, C57, C73 (OPT) CAP., OPTIONAL dc2052af 8 DEMO MANUAL DC2052A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURE/PART NUMBER 6 1 C66 CAP., X5R, 2.2μF, 16V, 10%, 0805 AVX 0805YD224KAT2A 7 1 C58 CAP., X5R, 10nF, 25V, 10%, 0603 AVX 06033A103JAT2A 8 1 C63 CAP., X5R, 10uF,25V, 20%,1206 Taiyo Yuden TMK316BJ106ML 9 1 C69 CAP., X5R, 150pF, 25V, 20%, 0603 AVX 06033C151KAT2A 10 1 D4 LED GREEN S-GW TYPE SMD PANASONIC LN1371SGTRP 11 1 D5 LED RED S-TYPE GULL WING SMD PANASONIC LN1271RTR 12 3 Q7, Q8, Q9 MOSFET P-CH 20V 0.58A SOT-23 VISHAY, TP0101K-T1-E3 13 1 Q10 MOSFET N-CH 60V 115MA SOT-23 FAIRCHILD, 2N7002K-7-F 14 1 Q11 MOSFET SPEED SRS 30V 30A LFPAK RENESAS, RJK0305DPB-00#J0 15 1 R27 RES., CHIP, 2Ω, 1%, 0603 Yageo RC0603FR-072RL 16 4 R63, R64, R70, R88 RES., CHIP, 10k, 1%, 0603 NIC NRC06F1002TRF 17 1 SUSMU RL3270WT-R005-F 18 R5 RESISTOR 0.005Ω 1W 1% 0815 R9, R16, R23, R28, R29, R30, R31, R32, R33, R34, R36, R37, R41, R42, R47, R48, R53, R54, R59, R61, R66, R73, R75, R95 RES., OPTIONAL 19 2 R20, R50 RES., CHIP, 16.2k, 1%, 0402 VISHAY CRCW040216K2FKED 20 1 R21 RES., CHIP, 17.4k, 1%, 0402 VISHAY CRCW040217K4FKEA 21 1 R55 RES., CHIP, 20.5k, 1%, 0402 VISHAY CRCW040220K5FKED 22 11 R11, R12, R35, R39, R43, R49, R51, R52, R56 RES., CHIP, 0Ω, 1%, 0603 VISHAY CRCW06030000Z0ED 23 4 R60, R62, R65, R67 RES., CHIP, 0Ω, 1%, 0603 VISHAY CRCW06030000Z0ED 24 2 R76, R77 RES., CHIP, 4.99k, 1%, 0603 VISHAY CRCW06034K99FKEA 25 2 R68, R69 RES., CHIP, 15.8k, 1%, 0603 ROHM, MCR03EZPFX1582 26 2 R71, R90 RES., CHIP, 10Ω, 1%, 0603 NIC NRC06F10R0TRF 27 1 R72 RES., CHIP, 200Ω, 1%, 0603 NIC NRC06F2000TRF 28 1 R74 RES., CHIP, 127Ω, 1%, 0603 VISHAY CRCW0603127RFKEA 29 3 R78, R79, R80 RES., CHIP, 100k, 1%, 0603 NIC NRC06F1003TRF 30 1 R82 RES., CHIP, 1M, 1%, 0603 NIC NRC06f1004TRF 31 1 R83 RES., CHIP, 154k, 1%, 0603 VISHAY CRCW0603154KFKEA 32 2 R84, R86 RES., CHIP, 20k, 1%, 0603 NIC NRC06F2002TRF 33 1 R85 RES., CHIP, 3.3Ω, 1%, 0603 VISHAY CRCW06033R30JNEA 34 1 R87 RES., CHIP, 681k, 1%, 0603 VISHAY CRCW0603681KFKEA 35 1 R89 RES., CHIP, 82.5Ω, 1%, 0603 VISHAY CRCW060382R5FKEA 36 1 R91 RES., CHIP, 0.01Ω, 1%, 2010 VISHAY, WSL2010R0100FEA 37 1 R92 TRIMMING POTENTIOMETER, 5k BOURNS, 3386P-1-502LF 38 1 U3 IC, 24LC025-I/ST, SOIC MICROCHIP, 24LC025-I/ST 39 2 U4, U6 IC, LT1129CS8-5, S8 PACKAGE LINEAR TECH, LT1129CS8-5 40 1 U5 IC, LT1129CS8-3.3 S8 PACKAGE LINEAR TECH. LT1129CS8-3.3 41 1 U7 IC., LTC6992-1, S6-TSOT LINEAR TECH. LTC6992CS6-1 42 1 U8 IC., LT1803IS5, S5-TSOT LINEAR TECH. LT1803IS5 dc2052af 9 DEMO MANUAL DC2052A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURE/PART NUMBER 1 15 E1-E5, E7, E8, E10, E12-E14, E18-E24 TESTPOINT, TURRET, 0.062" MILL-MAX, 2308-2-00-80-00-00-07-0 2 4 J1-J4 STUD, TEST PIN PEM KFH-032-10 3 8 J1-J4 (x2) NUT, BRASS 10-32 ANY #10-32 4 4 J1-J4 RING, LUG #10 KEYSTONE, 8205, #10 5 4 J1-J4 WASHER, TIN PLATED BRASS ANY #10 6 1 SW1 CONNECTOR, SUB MINIATURE SLIDE SWITCHES C&K., JS202011CQN 7 4 JP1-JP4 HEADER 3 PIN 0.079 SINGLE ROW SAMTEC, TMM103-02-L-S 8 4 JP1-JP4 SHUNT SAMTEC, 2SN-BK-G 9 1 J6 PIN HEADER 20 DUAL ROW RA (M) MILL MAX 802-40-020-20-0001 10 1 J7 CONN HEADER 12POS 2MM STR DL PCB FCI 98414-G06-12ULF 11 1 J8 CONN SOCKET 20 DUAL ROW RA (F) MILL MAX 803-93-020-20-001 12 2 J9, J10 CONN, BNC, 5 PINS CONNEX, 112404 13 4 MTH1-MTH4 STAND-OFF, NYLON 0.50" tall KEYSTONE, 8833(SNAP ON) 14 2 STENCIL (TOP & BOTTOM) STENCIL DC2052AT Hardware dc2052af 10 DEMO MANUAL DC2052A SCHEMATIC DIAGRAM dc2052af 11 DEMO MANUAL DC2052A SCHEMATIC DIAGRAM dc2052af 12 DEMO MANUAL DC2052A SCHEMATIC DIAGRAM dc2052af 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. 13 DEMO MANUAL DC2052A 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 dc2052af 14 Linear Technology Corporation LT 0413 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2013