DEMO MANUAL DC1675A LTC3829 High Efficiency, 6-Phase, Single Output, Synchronous Buck Converter DESCRIPTION Demonstration circuit 1675A is a high efficiency, 6-phase, synchronous buck converter with a 7V to 14V input range that utilizes two LTC®3829 controllers. It can supply 120A maximum load current with a 1.5V output voltage. The LTC3829 is a feature-rich single-output 3-phase synchronous buck controller with on-chip drivers and remote output voltage sensing. This board is set up with a sense resistor configuration for current sensing. Optional inductor DCR current sensing is possible. The temperature compensation function can guarantee accurate current limit over a wide temperature range with DCR sensing. The Stage Shedding™ function allows the controller to decrease the number of phases to one during a light load condition to save switching losses. Nonlinear control and active voltage positioning (AVP) can improve the transient response. The LTC3829 is suitable for an input voltage ranging from 4.5V to 38V and an output voltage up to 5V. It can provide high efficiency, high power density and PERFORMANCE SUMMARY PARAMETER versatile power solutions for telecom and datacom systems, industrial and medical instruments, DC power distribution systems and computer systems. The LTC3829 is available in 38-pin 5mm × 7mm QFN and 38-pin TSSOP packages. To shut down the converter, set the RUN pin voltage below 1.2V (JP1: Off). Use the JP4 jumper to select Burst Mode® operation, stage shedding mode or forced continuous mode operation at light load. The nonlinear control function is set by JP5 and JP6. The switching frequency is pre-set at about 400kHz, and can be easily modified from 250kHz to 770kHz. An on-board dynamic circuit is also available for a transient test. Please see LTC3829 data sheet for more detailed information. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and Stage Shedding is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. (TA = 25°C) CONDITION Input Voltage Range VALUE 7V to 14V Output Voltage, VOUT VIN = 7V to 14V, IOUT = 0A to 120A 1.5V ±2% Maximum Output Current, IOUT VIN = 7V to 14V, VOUT = 1.5V 120A Typical Efficiency VIN = 12V, VOUT = 1.5V, IOUT = 120A 87.6% Typical Switching Frequency 400kHz dc1675af 1 DEMO MANUAL DC1675A QUICK START PROCEDURE Demonstration circuit 1675A is easy to set up to evaluate the performance of the LTC3829. Refer to Figure 1 for the proper measurement equipment setup and follow the procedure below: 1. With power off, connect the input power supply to VIN (7V-14V) and GND (input return). 2. Connect the 1.5V output load between VOUT and GND (Initial load: no load). 3. Connect the DVMs to the input and outputs. Set default jumper position: JP1: ON; JP2: OFF; JP3: OFF; JP4: FORCE CONTINUOUS; JP5: OFF; JP6: OFF 4. Turn on the input power supply and check for the proper output voltages. VOUT should be 1.5V ±2%. 5. 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. 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. CURRENT SHUNT + + – V – + V CURRENT SHUNT – + IIN V IOUT – + LOAD + V – – Figure 1. Proper Measurement Equipment Setup dc1675af 2 DEMO MANUAL DC1675A QUICK START PROCEDURE Figure 2. Measuring Output Voltage Ripple 95 EFFICIENCY (%) 90 85 VOUT = 1.5V fSW = 400kHz CCM VIN = 7V VIN = 12V VIN = 14V 80 75 70 0 20 40 60 80 LOAD CURRENT (A) 100 120 DC1675A F03 Figure 3. Efficiency vs Load Current dc1675af 3 DEMO MANUAL DC1675A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 12 CIN1, CIN2, CIN3, CIN4, CIN5, CIN6, CIN11, CIN12, CIN13, CIN14, CIN15, CIN16 Cap., X5R 10μF 16V 10%,1210 AVX, 1210YD106KAT2A 2 3 CIN7, CIN8, CIN9 Cap., OSCON 180μF 16V 20% SANYO 16SVP180MX 3 6 COUT1, COUT4, COUT7, COUT22, COUT25, COUT28 Cap., X5R 100μF 6.3V 10%,1210 AVX, 12106D107KAT2A 4 12 COUT2, COUT3, COUT5, COUT6, COUT8, Cap., POSCAP 330μF 2.5V 20% COUT9, COUT23, COUT24, COUT26, COUT27, COUT29, COUT30 SANYO 2R5TPE330M9 5 3 COUT10, COUT11, C63 Cap., X7R 1μF 25V 10%,0805 AVX, 08053C105KAT9A 6 1 C1 Cap., NPO 100pF 16V 10%,0603 AVX, 0603YA101KAT2A 7 2 C3, C67 Cap., X7R 1μF 16V 10%,0603 AVX, 0603YC105KAT 8 2 C4, C78 CAP., NPO 22pF 16V 10% 0603 AVX, 0603YA220KAT 9 1 C5 Cap., X7R 0.0022μF 50V 10%,0603 AVX, 06035C222KAT2A 10 15 C10, C24, C25, C26, C40, C53, C55, C56, C62, Cap., X5R 0.1μF 25V 5%,0603 C69, C73, C77, C79, C80, C86 11 2 C11, C74 Cap., X5R 4.7μF 10V 10%,0805 AVX, 0805ZD475KAT 12 6 C21, C22, C23, C81, C82, C83 Cap., NPO 1000pF 25V 5%,0603 AVX, 06033A102JAT2A 13 3 C44, C57, C58 Cap., X7R 0.01μF 50V 10%,0603 AVX, 06035C103KAT2A 14 1 C52 Cap., NPO 100pF 50V 5%,1206 AVX, 12065A101JAT2A 15 5 C54, C61, C65, C66, C68 Cap., X7R 4.7μF 25V 10%,1206 AVX, 12063C475KAT 16 1 C60 Cap., X5R 0.47μF 16V 10%,0603 AVX 0603YD474KAT2A 17 1 C64 Cap., NPO 10pF 25V 5%,0603 AVX, 06033A100JAT 18 2 C70, C71 Cap., X7R 10μF 16V 10%,1206 AVX, 1206YC105KAT 19 6 D1, D2, D3, D8, D9, D10 Schottky Diode, 30V Central Semi. CMDSH-3 20 1 D4 Zener Diode, 5.1V On Semi. MMBZ5231BLT1G 21 1 D5 Schottky Diode Diodes Inc. BAT54S 22 2 D6,D7 Diode Schotkky, 40V Diodes Inc. B0540W-7 23 6 L1, L2, L3, L4, L5, L6 Inductor, 0.33μH Wurth, 744308033 24 1 L7 Inductor, 10μH Sumida,CLS62RC-100 25 1 L8 Inductor, 10μH, CMD series SUMIDA, CMD4D08NP-100MC 26 6 Q1, Q5, Q9, Q17, Q21, Q25 N-Chanel Pwr MOSFET RENESAS, RJK0305DPB 27 12 Q3, Q4, Q7, Q8, Q11, Q12, Q19 Q20, Q23, Q24, Q27, Q28 N-Chanel Pwr MOSFET RENESAS, RJK0330DPB 28 1 Q13 NPN Transistors, SOT23 Zetex, FMMT619TA 29 2 Q14, Q15 MOSFET, N-Channel 30V Siliconix, SUD50N03-09P 30 1 Q16 PNP Transistors, SOT23 Zetex, FMMT718TA 31 6 RSNS1, RSNS2, RSNS3, RSNS4, RSNS5, RSNS6 Res., Chip, 0.001Ω, 1%, 2010_Kelvin VISHAY, WSL20101L000FEA 32 1 R1 Res., Chip, 30.1k, 1%, 0603 VISHAY, CRCW060330K1FKEA 33 1 R2 Res., Chip, 20.0k, 1%, 0603 VISHAY, CRCW060320K0FKEA 34 20 R3, R13, R27, R28, R29, R35, R45, R87, R90, R96, R104, R107, R108, R121, R123, R125, R131, R132, R133, R134 Res., Chip, 0Ω, 0603 VISHAY, CRCW06030000Z0EA AVX 06033D104JAT2A dc1675af 4 DEMO MANUAL DC1675A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 35 2 R4, R92 Res., Chip, 66.5Ω, 1%, 0603 VISHAY,CRCW060366R5FKEA 36 1 R5 Res., Chip, 35.7k, 1%, 0603 VISHAY, CRCW060335K7FKEA 37 2 R6,R8 Res., Chip, 10Ω, 1%, 0603 VISHAY, CRCW060310RFKEA 38 1 R7 Res., Chip, 4.87k, 1%, 0603 VISHAY, CRCW06034K87FKEA 39 2 R9, R106 Res., Chip, 27.4k, 1%,0603 VISHAY, CRCW060327K4FKEA 40 2 R10, R95 Res., Chip, 2.2Ω, 1%, 0603 VISHAY, CRCW06032R20FNEA 41 3 R11, R61, R93 Res., Chip, 100k, 1%, 0603 VISHAY, CRCW0603100KFKEA 42 12 R21, R22, R23, R24, R25, R26, R112, R113, R114, R115, R116, R117 Res., Chip, 100Ω, 1%, 0603 VISHAY, CRCW0603100RFKEA 43 2 R47, R122 Res., Chip, 28k, 1%, 0603 VISHAY, CRCW060328KFKEA 44 1 R69 Res., Chip, 390k, 1%, 0603 VISHAY, CRCW0603390K0FKEA 45 1 R70 Res., Chip, 110k, 1%, 0603 VISHAY, CRCW0603110K0FKEA 46 2 R71, R74 Pot. 11 Turns 50k Bourns 3313J-1-503E 47 1 R77 Pot. 3386-3/8 Square Bourns 3386P-1-503LF 48 1 R72 Res., Chip, 1.5k, 1%, 0603 VISHAY, CRCW06031K50FKEA 49 1 R75 Res., Chip, 7.5k, 1%, 0603 VISHAY, CRCW06037K50FKEA 50 1 R76 Res., Chip, 1k, 1%, 0603 VISHAY, CRCW06031K0FKEA 51 1 R78 Res., Chip, 2k, 1%, 0603 VISHAY, CRCW06032K00FKEA 52 4 R79, R80, R81, R82 Res., Chip, 0.010Ω, 0.5W 1% VISHAY, WSL2010R0100FEA 53 1 R83 Res., Chip, 115k, 1%, 0603 VISHAY, CRCW0603115KFKEA 54 1 R84 Res., Chip, 13.3k, 1%, 0603 VISHAY, CRCW060313K3FKEA 55 1 R86 Res., Chip, 30.1k, 1%, 0603 VISHAY, CRCW060330K1FKEA 56 1 R89 Res., Chip, 10k, 1%, 0603 VISHAY, CRCW060310K0FKEA 57 1 R98 Res., Chip, 30.9k, 1%, 0603 VISHAY, CRCW060330K9FKEA 58 2 U2, U1 I.C.,Volt. Reg., 38-Pin 7mm × 5mm QFN Linear Tech., LTC3829EUHF 59 1 U3 I.C., Low Pwr Timer TI, TLC555ID (4 tubes@75) 60 1 U4 I.C., Volt. Reg. Linear Tech. Corp. LT1930ES5 61 1 U5 I.C., Dual Op Amp Linear Technology Corp. LT1361CS8 62 1 U6 I.C., LT1761ES5, SOT23 Linear Tech. Corp. LT1761ES5-SD 63 1 U7 I.C., Feedback Amp Linear Tech. Corp. LT1210CR 64 1 VR1 I.C., Volt. Ref. Linear Tech. Corp. LT1004CS8-1.2 Additional Demo Board Circuit Components 1 0 COUT16, COUT17, COUT18, COUT19, COUT20, COUT21 Cap., 1210 OPT 2 0 OPT RNTC1, C1, RNTC2, R12, R36, R41, C41, R42, R51, C51, R52, R53, R54, R55, R56, R57, R58, R59, R60, C72, R73, C75, C76, C84, R85, C85, R88, R91, R94, R97, R99, R100, R101, R102, R103, R105, R109, R110, R111, R118, R119, R120, R124, R126, R127, R128, R129, R130, R133, R135 3 0 COUT12, COUT13, COUT14, COUT15, COUT31, COUT32, COUT33, COUT34 4 0 C59 Cap., 1206, OPT 5 0 Q2, Q6, Q10, Q18, Q22, Q26 OPT Cap., 7343, OPT dc1675af 5 DEMO MANUAL DC1675A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Hardware-For Demo Board Only 1 4 J1, J2, J3, J4 Stud, Test Pin PEM KFH-032-10 2 8 (J1, J2, J3, J4,) × 2 Nut, Brass Nuts #10-32 ANY #10-32 3 4 J1, J2, J3, J4 Ring, Lug Ring #10 KEYSTONE #10 4 4 J1, J2, J3, J4 Washer, Tin Plated Brass ANY #10 5 15 E1-E14, E17 Turret, Testpoint , 091" Mill Max 2501-2-00-80-00-00-07-0 6 5 JP1, JP2, JP3, JP5, JP6 Headers, 3 Pins 2mm Ctrs. Samtec TMM-103-02-L-S 7 1 JP4 Headers, 4 Pins 2mm Ctrs. Samtec TMM-104-02-L-S 8 6 XJP1, XJP2, XJP3, XJP4, XJP11, XJP12 Shunt, 2mm Ctrs. Samtec 2SN-BK-G 9 2 J5, J6 CONN. VERT PC-MNT BNC 50Ω CONNEX 112404 10 4 Stand-Off, Nylon 0.5" Tall KEYSTONE, 8833(SNAP ON) dc1675af 6 DEMO MANUAL DC1675A SCHEMATIC DIAGRAM dc1675af 7 DEMO MANUAL DC1675A SCHEMATIC DIAGRAM dc1675af 8 DEMO MANUAL DC1675A SCHEMATIC DIAGRAM dc1675af 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. 9 DEMO MANUAL DC1675A 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 dc1675af 10 Linear Technology Corporation LT 0311 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2011