DEMO MANUAL DC2236A-B LTC3890 60V, Low IQ Multiphase Synchronous Step-Down Converter DESCRIPTION Demonstration circuit 2236A-B is a high output voltage, high efficiency synchronous PolyPhase® buck converter featuring the LTC®3890EUH. The DC2236A-B has wide input voltage range of 16V up to 60V, and is capable of delivering up to 25A of output current. The output voltage is set to 12V, however, the output voltage can go as high as 24V, with certain modifications. The DC2236A-B supports three operation modes: Fixed frequency modulation, pulse-skipping and Burst Mode® operation. Fixed frequency mode of operation maximizes the output current, reduces output voltage ripple, and yields a low noise switching spectrum. Burst Mode employs a variable frequency switching algorithm that minimizes the no-load input quiescent current and improves efficiency at light loads. The DC2236A-B consumes less than 50µA of quiescent current during shutdown and less than 1mA under a no load condition with the output in regulation in Burst Mode operation. The DC2236A-B has a standard operating frequency of 150kHz, but can be adjusted to frequencies as high as 900kHz. The DC2236A is a dual phase single output step-down converter; however it designed to be easily transformed to 4- or 6-phase system by combining two or three DC2236A-B boards. The LTC3890EUH data sheet gives a complete description of these parts, operation and application information and must be read in conjunction with this quick start guide for demonstration circuit 2236A-B. Table 1 summarizes the differences between the parts in the LTC3890 family. Design files for this circuit board are available at http://www.linear.com/demo/DC2236A-B L, LT, LTC, LTM, Linear Technology, Burst Mode, PolyPhase 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 Minimum Input Voltage 16V Maximum Input Voltage Output Voltage VOUT Regulation 60V VIN = 16V to 55V Maximum Continuous Output Current Preset Operating Frequency 12V ± 2% 25A R7 = 30.1kΩ External Clock Sync. Frequency Range Efficiency VALUE 150kHz 75kHz to 850kHz VIN = 36V, VOUT = 12V, IOUT = 12A, See Figure 3 Efficiency Curves for Complete Operating Range 97% Typical Output Ripple VOUT VIN = 36V, IOUT = 12A (20MHz BW) Quiescent Current at Shutdown VIN = 16V to 55V <35mVP-P <50µA Input Current at No Load VIN = 16V to 55V <1mA dc2236abf 1 DEMO MANUAL DC2236A-B QUICK START PROCEDURE Demonstration circuit 2236A-B is easy to set up to evaluate the performance of the LTC3890. For proper measurement equipment configuration, set up the circuit according to the diagram in Figure 1. Before proceeding to test, insert shunt into JP1 (RUN) OFF position, which connects the RUN pin to ground (GND), and thus, shuts down the circuit. 2.Turn on the circuit by inserting the shunt in header JP1 (RUN) into the ON position. The output voltage should be regulating. Measure VOUT – it should measure 12V ± 2% (Do not apply more than the rated maximum voltage of 60V to the board or the part may be damaged). 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. 3.Vary the converter load, which should not exceed 25A. Note: all four input and output terminals VIN, VOUT and two GND equipped with two banana connectors, twowires can be used for each terminal to reduce copper looses and heat dissipation in the interconnection lines. 1.With the DC2236A-B set up according to the proper measurement and equipment in Figure 1, apply 20V at VIN. Measure VOUT; it should read 0V. If desired, one can measure the shutdown supply current at this point. The supply current will be approximately 50µA, or less, in shutdown. 4.Vary the input voltage from 16V to 55V, the VOUT – it should measure 12V ± 2% 5.Set output current to zero and move jumper JP2 (MODE) into BURST MODE position and measure VOUT – it should register 12V ± 2%. 6.Set output current to zero and move jumper JP2 (MODE) into PLS SKIP position and measure VOUT – it should register 12V ± 2% Figure 1. Proper Measurement Equipment Setup dc2236abf 2 DEMO MANUAL DC2236A-B QUICK START PROCEDURE Table 1. Summary of the Differences Between the Parts in the LTC3890 Family LTC3890 LTC3890-1 LTC3890-2 LTC3890-3 ILIM Pin for Adjustable Current Sense Voltage? Yes No Yes No CLKOUT and PHASMD Pins for PolyPhase® Operation? Yes No Yes No Independent PGOOD Pins for Each Channel Yes; PGOOD1 and PGOOD2 No; PGOOD1 Only Yes; PGOOD1 and PGOOD2 No; PGOOD1 Only Overvoltage Protection Bottom Gate “Crowbar?” Yes Yes No; BG Not Forced On No; BG Not Forced On Current Foldback During Overcurrent Events Yes Yes No No Forced Continuous Forced Continuous Pulse-Skipping Pulse-Skipping Operation with SENSE Common Mode < 0.5V Requires VFB < 0.65V Operation with SENSE Common Mode < 0.5V Requires VFB < 0.65V Not Dependent on VFB Voltage. Makes It Easy to Make a Non-synchronous Boost or SEPIC Converter with Ground-Referenced Current Sensing Not Dependent on VFB Voltage. Makes It Easy to Make a Non-synchronous Boost or SEPIC Converter with Ground-Referenced Current Sensing Light Load Operation When Synchronized to External Clock Using PLLIN/MODE Pin SENSE Pins Common Mode Range dc2236abf 3 DEMO MANUAL DC2236A-B QUICK START PROCEDURE GND VIN Figure 2. Measuring Input or Output Ripple 99.5 24V 36V 48V 99.0 η (%) 98.5 98.0 97.5 97.0 96.5 96.0 5 10 20 15 LOAD (A) 25 30 dc2236ab F03 Figure 3. Efficiency vs Load 0.22 0.20 IIN (mA) 0.18 0.16 0.14 0.12 0.10 20 25 30 35 VIN (V) 40 45 50 dc2236ab F04 Figure 4. Input Current at No Load vs Input Voltage (Burst Mode) dc2236abf 4 DEMO MANUAL DC2236A-B QUICK START PROCEDURE Figure 5. Output Noise, VIN 36V, IO 12A Figure 6. Thermal Map, VIN 48V, VO 12V, IO 25A, No Air Flow dc2236abf 5 DEMO MANUAL DC2236A-B PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., ALUM., 56µF, 63V, 20% SUN ELECT., 63HVH56M Required Circuit Components 1 2 C1, C29 2 6 C2, C3, C4, C5, C6, C7 CAP., X7R, 2.2µF, 100V, 10%, 1812 TDK, C4532X7R2A225K 3 2 C8, C26 CAP., NPO, 2.2pF, 50V, ±0.25pF, 0603 AVX, 06035A2R2CAT 4 1 C9 CAP., X7S, 1µF, 100V, 10%, 0805 TDK, C2012X7S2A105K330 5 4 C11, C14, C23, C24 CAP., X5R, 10µF, 50V, 1210, 20% TAIYO YUDEN, UMK325BJ106MM-T 6 3 C12, C16, C21 CAP., X7R, 0.1µF, 50V, 10%, 0603 TDK, C1608X7R1H104K 7 2 C15, C25 CAP., Sanyo, 150µF, 16V, 20% SANYO, 16TSVPC150 8 1 C17 CAP., X7R, 4.7nF, 100V, 10%, 0603 AVX, 06031C472KAT 9 2 C18, C19 CAP., NPO, 47pF, 25V, 10%, 0603 AVX, 06033A470KAT2A 10 2 C20 CAP., X7R, 4.7µF, 10V, 10%, 0603 TAIYO YUDEN, LMK107BJ475KA-T 11 1 C22 CAP., NPO, 10pF, 25V, 10%, 0603 AVX, 06033A100KAT2A 12 1 C27 CAP., X5R, 1µF, 25V, 10%, 0603 AVX, 06033D105KAT2A 13 2 D1, D2 DIODE, SCHOTTKY, DFLS1100, PDI-123 DIODES, INC., DFLS1100 14 2 L1, L2 IND., 10µH, SMD COILCRAFT SER2915L-103KL 15 2 Q1, Q4 RENESAS, N CH POWER MOS FET RENESAS, RJK0651DPB 16 2 Q2, Q5 RENESAS, N CH POWER MOS FET RENESAS, RJK0653DPB 17 1 R1 RES., 2.2Ω 1%, 1/10W, 0603 VISHAY, CRCW06032R20FNEA 18 2 R4, R22 RES., 100Ω 1%, 1/10W, 0603 VISHAY, CRCW0603100RFKEA 19 6 R2, R10, R14, R15, R24, R27 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA 20 1 R6 RES., 1M, 5%, 0805 VISHAY, CRCW08051M00JNED 21 1 R7 RES., 30.1k, 1%, 1/10W, 0603 VISHAY, CRCW060330K1FKEA 22 2 R8, R19 RES., 0.003Ω, 1%, 1/2W, 2010 VISHAY, WSL20103L000FEA 23 1 R9 RES., 57.6k, 1%, 1/10W, 0603 VISHAY, CRCW060357K6FKEA 24 2 R12, R18 RES., 0Ω, 1/10W, 0805 VISHAY, CRCW08050000Z0EA 25 1 R13 RES., 9.76k, 1%, 1/10W, 0603 VISHAY, CRCW060315K0FKEA 26 1 R16 RES., 499k, 1%, 1/10W, 0603 VISHAY, CRCW0603499KFKEA 27 1 R20 RES., 35.7k, 1%, 1/10W, 0603 VISHAY, CRCW060335K7FKEA 28 2 R21, R29 RES., 100k, 1%, 1/10W, 0603 VISHAY, CRCW0603100KFKEA 29 1 R28 RES., 1k, 1%, 1/10W, 0603 VISHAY, CRCW06031K00FKEA 30 1 U1 I.C., LTC3890EUH, QFN-32-UH LINEAR TECH. LTC3890EUH Additional Demo Board Circuit Components 1 0 R3, R5, C10, C13, R25, R26, C28 OPT 0603 PACKAGE 2 0 Q3, Q6, Q7, Q8 OPT LFPAK PACKAGE TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 Hardware: For Demo Board Only 1 11 E1-E11 2 2 JP1, JP2 JMP, 3PIN 1 ROW, 0.079" SAMTEC, TMM-103-02-L-S 3 2 XJP1, XJP2 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G 4 7 J1-J8 CONNECTOR, BANANA JACK KEYSTONE, 575-4 5 4 MTGS AT 4 CORNERS STANDOFF, NYLON 0.5 1/2" KEYSTONE, 8833(SNAP-ON) dc2236abf 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. 1 2 3 4 J1 J2 JP1 EXTVCC PGOOD E3 E1 0 R15 3 2 1 RUN E4 J4 J3 VOUT OFF ON GND 16V UP TO 60V VIN A R27 0 R1 2.2 R21 100K 1% C27 1uF 47pF R14 0 0.1uF C12 TP2 TP4 R10 0 1% R7 30.1K CLKOUT EXTVCC ILIM PGOOD2 PGOOD1 PGND VFB2 VFB1 SGND SGND ITH2 ITH1 TRACK/SS2 TRACK/SS1 RUN2 RUN1 FREQ PHASEMD [2] LTC3890EUH-2 LTC3890EUH -B IC -A VERSION B 1. ALL RESISTORS AND CAPACITORS ARE 0603. 4 20 28 14 27 21 11 31 33 6 12 30 13 29 8 7 2 3 C3 2.2uF INTVCC 100V 1812 R3 R5 OPT OPT C13 OPT C19 INTVCC VOUT TP3 47pF C17 1% 4.7nF C18 R13 9.76K TP1 TP6 C2 2.2uF 100V 1812 NOTE: UNLESS OTHERWISE SPECIFIED R26 OPT R25 OPT INTVCC C29 56uF 63V 63HVH56M + C22 10pF R9 57.6K 1% R20 35.7K 1% R16 499K 1% C10 OPT R6 1M 0805 VIN C1 56uF + 63V 63HVH56M VIN 22 VIN E2 GND GND [2] U1 C9 1uF 100V 0805 E11 E10 PLLIN/MOD SENSE2- SENSE2+ BG2 BOOST2 SW2 TG2 INTVCC BG1 BOOST1 SW1 TG1 SENSE1+ SENSE1- 5 9 10 18 17 16 15 19 23 24 25 26 32 1 2 1 C20 4.7uF 2 C21 0.1uF 1 C C26 2.2pF Q4 4 VIN 4 Q3 OPT Q8 OPT L2 10uH 4 4 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. Q6 OPT C28 OPT S2 1K 1% R28 D SCALE = NONE C23 10uF 50V 1210 C11 10uF 50V 1210 PRODUCTION DATE VICTOR K. APPROVED VOUT S2 S1 SW2 SW1 E9 E8 J8 SW1 SW2 S1 S2 SYNC GND C25 + 150uF 16V 16SVPC150M J7 E7 E6 J6 GND VOUT J5 C15 12V@25A 150uF + 16V 16SVPC150M E5 04/07/14 DATE: N/A SIZE E SHEET 1 LTC3890EUH-2/LTC3890EUH DEMO CIRCUIT 2236A-A/B Friday, June 20, 2014 IC NO. 2 OF 1 REV. POLYPHASE HIGH VOLTAGE STEP-DOWN CONVERTER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only C24 10uF 50V 1210 C14 10uF 50V 1210 VOUT E REVISION HISTORY DESCRIPTION TECHNOLOGY C7 2.2uF 100V 1812 R19 0.003 1% 2010 C6 2.2uF 100V 1812 2010 VICTOR K. TITLE: SCHEMATIC AK/MI APPROVALS INTVCC R29 1 - R8 0.003 1% REV ECO C5 2.2uF 100V 1812 SER2915L-103KL 4 100K 1% CUSTOMER NOTICE D L1 10uH SER2915L-103KL S1 C4 2.2uF 100V 1812 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 2 4 6 MODE Q5 RJK0653DPB SW2 RJK0651DPB JP2 FCC 5 PLS SKIP 3 BURST 1 R24 0 R22 100 1% 0805 D2 DFLS1100 R18 0 INTVCC 0805 D1 DFLS1100 10V R12 0 SW1 Q2 RJK0653DPB 4 4 Q7 OPT 4 VIN Q1 RJK0651DPB R4 100 1% R2 0 C16 0.1uF C8 2.2pF 5 1 2 3 C 1 2 3 B 5 1 2 3 5 1 2 3 5 1 2 3 5 5 1 2 3 5 1 2 3 5 1 2 3 A 1 2 3 4 DEMO MANUAL DC2236A-B SCHEMATIC DIAGRAM dc2236abf 7 DEMO MANUAL DC2236A-B 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 dc2236abf 8 Linear Technology Corporation LT 0714 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2014