DEMO MANUAL DC1543A LTM4641 38V, 10A, Step-Down Module Regulator with Advanced Input and Load Protection DESCRIPTION Demonstration circuit 1543A features the LTM(R)4641, a high efficiency, high density switch mode step-down power Module regulator with superior input and load protection features. The input voltage range is from 4.5V to 38V. The output voltage is jumper programmable from 0.8V to 6V with a rated load current of 10A. Derating is necessary for certain VIN, VOUT, frequency and thermal conditions. DC1543A offers the TRACK/SS pin allowing the user to program output tracking or soft-start period. The DC1543A allows the user to enable/disable input undervoltage protection; input latching/non-latching overvoltage protection; and latching/non-latching overtemperature protection. Higher efficiency at low load currents is achieved by setting the MODE pin jumper to DCM. The LTM4641 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit 1543A. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Module, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY PARAMETER CONDITIONS Input Voltage Range VALUE 4.5V to 38V Output Voltage VOUT Jumper Selectable 0.8V, 1.0V, 1.2V, 1.5V, 1.8V, 3.3V, 5V, 6V; 1.5% Maximum Continuous Output Current Derating is Necessary for Certain Operating Conditions. See Data Sheet for Details. 10ADC Default Operating Frequency RfSET = 680k for VOUT = 0.8V, 1.0V, 1.2V, 1.5V, 1.8V; RfSET = (Not Stuffed) for VOUT = 3.3V, 5.0V, 6.0V 255kHz (VOUT = 0.8V); 320kHz (VOUT = 1.0V); 385kHz (VOUT = 1.2V); 480kHz (VOUT = 1.5V); 575kHz (VOUT = 1.8V); 360kHz (VOUT = 3.3V); 550kHz (VOUT = 5.0V); 660kHz (VOUT = 6.0V); Efficiency VIN = 12V, VOUT = 6V, IOUT = 10A 93.0% See Figure 2 Load Transient VIN = 12V, VOUT = 3.3V See Figure 3 BOARD PHOTO dc1543afa 1 DEMO MANUAL DC1543A QUICK START PROCEDURE Demonstration circuit 1543A is an easy way to evaluate the performance of the LTM4641. Please refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 1. Place jumpers in the following positions for a typical 3.3VOUT application: INPUT NON-LATCH INPUT OVLO OVP OFF OFF INPUT UVLO OVER-TEMP BEHAVIOR OFF NON-LATCH RUN MODE TRACK/SS VOUT Select ON CCM SS 3.3V FSET VOUT > 3.0V 2. With power off, connect the input power supply, load and meters as shown in Figure 1. Preset the load to 0A and VIN supply to be 0V. 3. Turn on the power at the input. Increase VIN to 12V (Do not apply more than the rated maximum voltage of 38V to the board or the part may be damaged). The output voltage should be regulated and deliver the selected output voltage 1.5%. 4. Vary the input voltage from 4.5V to 38V and adjust the load current from 0A to 10A. Observe the output voltage regulation, ripple voltage, efficiency, and other parameters. Output voltage ripple may be measured at J6 with a BNC cable and oscilloscope. The probe channel for VOUT should be set at 50 termination resistance to match the BNC cable. 5. (Optional) For optional load transient test, apply an adjustable pulse signal between IOSTEP_CLK and GND test points. The pulse amplitude sets the load step current amplitude. Keep the pulse width short (<1ms) and pulse duty cycle low (<5%) to limit the thermal stress on the load transient circuit. The load step current can be monitored with a BNC connected to J5 (25mV/A). 6. (Optional) To test the advanced input and load protections, put the corresponding jumper in the "ON" position. For DC1543A, the thresholds for different input and output protections are set as shown below: INPUT OVLO 36V NON-LATCH INPUT OVP 32V INPUT UVLO 8V for Rising Edge 7V for Falling Edge OVER-TEMP LATCH 145C BEHAVIOR NON-LATCH 145C: Cease Regulation 135C: Resume Regulation dc1543afa 2 DEMO MANUAL DC1543A QUICK START PROCEDURE - - LOAD + + - + - + - VIN + + - Note: Demo circuit 1543A demonstrates a functional but outdated square pad layout for LTM4641. Refer to the design files recommending round pads for future PCB designs available at www.linear.com/demo. Figure 1. Proper Measurement Equipment Setup dc1543afa 3 DEMO MANUAL DC1543A QUICK START PROCEDURE Efficiency vs Load Current at 24VIN 95 90 90 85 85 80 80 75 70 65 3.3VOUT, 360kHz 2.5VOUT, 335kHz 1.8VOUT, 325kHz 1.5VOUT, 315kHz 1.2VOUT, 285kHz 1.0VOUT, 255kHz 0.9VOUT, 235kHz 60 55 50 45 40 0 1 2 3 4 5 6 7 8 OUTPUT CURRENT (A) 9 EFFICIENCY (%) EFFICIENCY (%) Efficiency vs Load Current at 6VIN 95 75 6.0VOUT, 660kHz 5.0VOUT, 550kHz 3.3VOUT, 360kHz 2.5VOUT, 335kHz 1.8VOUT, 325kHz 1.5VOUT, 315kHz 1.2VOUT, 285kHz 1.0VOUT, 255kHz 0.9VOUT, 235kHz 70 65 60 55 50 45 40 10 0 1 2 2a. VIN = 6V 90 90 85 85 80 80 75 6.0VOUT, 660kHz 5.0VOUT, 550kHz 3.3VOUT, 360kHz 2.5VOUT, 335kHz 1.8VOUT, 325kHz 1.5VOUT, 315kHz 1.2VOUT, 285kHz 1.0VOUT, 255kHz 0.9VOUT, 235kHz 60 55 50 45 75 70 6.0VOUT, 660kHz 5.0VOUT, 550kHz 3.3VOUT, 360kHz 2.5VOUT, 335kHz 1.8VOUT, 325kHz 1.5VOUT, 315kHz 1.2VOUT, 285kHz 1.0VOUT, 255kHz 0.9VOUT, 235kHz 65 60 55 50 45 40 40 0 1 2 3 4 5 6 7 8 OUTPUT CURRENT (A) 2b. VIN = 12V 10 Efficiency vs Load Current at 36VIN 95 EFFICIENCY (%) EFFICIENCY (%) Efficiency vs Load Current at 12VIN 65 9 2c. VIN = 24V 95 70 3 4 5 6 7 8 OUTPUT CURRENT (A) 9 10 0 1 2 3 4 5 6 7 8 OUTPUT CURRENT (A) 9 10 2d. VIN = 36V Figure 2. Measured DC1543A Efficiency at Different VIN, VOUT and fSW (CCM Mode Enabled) Please refer to Table 1 in LTM4641 data sheet for the switching frequency at each output voltage. dc1543afa 4 DEMO MANUAL DC1543A QUICK START PROCEDURE VOUT: 50mV/DIV IOUT_STEP: 4A/DIV 3a. VIN = 12V, VO = 3.3V, 0A to 4A Load Step VOUT: 20mV/DIV IOUT_STEP: 4A/DIV 3b. VIN = 12V, VO = 1.0V, 0A to 4A Load Step Figure 3. Measured Load Transient Responses VIN = 24V, VOUT =6V, ILOAD = 10A, Ambient Temperature = 29.4C, No Forced Air Flow Figure 4. Thermal Image of LTM4641 dc1543afa 5 DEMO MANUAL DC1543A PARTS LIST ITEM QTY REFERENCE Required Circuit Components 1 2 CIN2, CIN1 2 2 CIN3, CIN4 3 3 CO1, CO2, CO8 4 3 CO3, CO4, CO5 5 1 C10 6 1 R1 7 2 R5, R7 8 2 R13, R26 9 1 U1 Hardware/Components (For Demo Board Only) 1 1 C2 2 2 C8, C9 3 1 R2 4 1 R15 5 1 R17 6 1 R18 7 1 R19 8 1 R20 9 1 R21 10 1 R22 11 1 R23 12 1 R25 13 1 R28 14 1 R10 15 1 R24 16 1 R16 17 1 R9 18 2 R12, R8 19 3 R6, R31, R34 20 2 R3, R32 21 2 RS2, RS1 22 1 Q2 23 1 Q3 24 1 Q1 25 0 C3, C4, C5, C6, C7(OPT) 26 0 CIN5(OPT) 27 0 R4, R27, R29, R33, R35, R36(OPT) 28 0 R11(OPT) 29 0 D2 (OPT) Hardware 1 9 JP1-JP8, JP18 2 8 JP9-JP15, JP18 3 3 JP4, JP9-JP15, JP17 4 2 J5, J6 5 4 J1-J4 6 13 E2, E5-E8, E11, E12, E15-E20 7 1 JP16 8 4 STAND OFF PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., Aluminum, 100F, 50V CAP., X7R, 4.7F, 50V, 10%, 1210 CAP., POSCAP, 150F, 10V, D3L CAP., X7R, 47F, 10V, 10%, 1210 CAP., X5R, 3300pF, 50V, 10%, 0603 RES., CHIP, 13.7k, 1/16W, 1%, 0603 RES., CHIP, 100k, 1/16W, 1%, 0603 RES., CHIP, 2.49k, 1/16W, 0.1%, 0603 I.C., LTM4641, BGA SUN ELECT, 50CE100LX AVX, 12105C475KAT2A SANYO, 10TPF150ML AVX, 1210ZC476KAT2A AVX, 06035C332KAT2A VISHAY, CRCW060313K7FKEA VISHAY, CRCW0603100KFKEA VISHAY, TNPW06032K49BEEA LINEAR TECH., LTM4641EY#PBF CAP., X7R, 4.7uF, 25V, 10%, 0805 CAP., X5R, 8200pF, 50V, 10%, 0603 RES., CHIP, 680k, 1/16W, 1%, 0603 RES., CHIP, 2.2M, 1/16W, 1%, 0603 RES., CHIP, 165k, 1/16W, 1%, 0603 RES., CHIP, 7.15k, 1/16W, 1%, 0603 RES., CHIP, 4.12k, 1/16W, 1%, 0603 RES., CHIP, 2.94k, 1/16W, 1%, 0603 RES., CHIP, 1.18k, 1/16W, 1%, 0603 RES., CHIP, 715, 1/16W, 1%, 0603 RES., CHIP, 576, 1/16W, 1%, 0603 RES., CHIP, 3.16k, 1/16W, 1%, 0603 RES., CHIP, 24.9k, 1/16W, 1%, 0603 RES., CHIP, 1.78M, 1/16W, 1%, 0603 RES., CHIP, 13k, 1/16W, 1%, 0603 RES., CHIP, 1M, 1/16W, 1%, 0603 RES., CHIP, 187k, 1/16W, 1%, 0603 RES., CHIP, 10, 1/16W, 1%, 0603 RES., CHIP, 0, 1/16W, 1%, 0603 RES., CHIP, 10K, 1/16W, 1%, 0603 RES., CHIP, 0.05, 1W, 1% 2512 Silicon N-Channel MOSFET, POWERPAK-SO8 Silicon N-Channel Power MOSFET, LFPAK N-Channel 30-V MOSFET, TO-252 CAP., 0603 CAP., 1210 RES., 0603 RES., 1206 ZENER VOLTAGE REGULATOR, SOD-523 MURATA, GRM21BR61E475KA12L AVX, 06035C822KAT2A YAGEO, RC0603FR-07680KL VISHAY, CRCW06032M20FKEA VISHAY, CRCW0603165KFKEA VISHAY, CRCW06037K15FKEA VISHAY, CRCW06034K22FKEA VISHAY, CRCW06032K94FKEA VISHAY, CRCW06031K18FKEA VISHAY, CRCW0603715RFKEA VISHAY, CRCW0603576RFKEA VISHAY, CRCW06033K16FKEA VISHAY, CRCW060324K9FKEA VISHAY, CRCW06031M78FKEA VISHAY, CRCW06065K5KFKEA VISHAY, CRCW06031M00FKEA VISHAY, CRCW0603187KFKEA VISHAY, CRCW060310R0FKEA VISHAY, CRCW06030000Z0EA VISHAY, CRCW060310K0FKEA VISHAY, WSL2512R0500FEA VISHAY, Si7164DP-T1-GE3 PHILPS, PH2625L VISHAY, SUD50N03-09P-E3 CENTRAL SEMI., CMOZ43V TR 2mm SINGLE ROW HEADER, 2-PIN 2mm SINGLE ROW HEADER, 3-PIN SHUNT CONN, BNC, 5 PINS JACK, BANANA TESTPOINT, TURRET, .095" Ultra-Small Tractile Switch STAND-OFF, NYLON 0.50" tall SAMTEC, TMM102-02-L-S SAMTEC, TMM-103-02-L-S SAMTEC, 2SN-BK-G CONNEX, 112404 KEYSTONE, 575-4 MILL-MAX, 2501-2-00-80-00-00-07-0 PANASONIC, EVQPE105K KEYSTONE, 8833 (SNAP ON) dc1543afa 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. B SGND RUN TRACK VIN- GND VIN 4.5V - 38V E20 E19 E18 E11 J2 J1 R24 13K R9 187k + 3 R33 (OPT) R28 24.9K R25 3.16K ON JP9 INPUT UVLO 1 OFF CIN1 + 100uF 50V R10 1.78M R32 10K INTVCC VIN+ 2 E8 ON RUN 1 TRACK TRACK/SS 1 DCM MODE 3 1 1 1 C10 3.3nF LATCH R34 0 M10 M9 J3 1M A C7 OPT D5 L2 D4 K2 D3 B5 A6 A4 B4 K7 K8 K9 K10 L7 L8 L9 L10 L11 L12 M7 M8 M11 M12 CMOZ43V OPT 0 RUN TRACK/SS TMR FCB OTBH OVLO R2 680k R4 (OPT) IOVRETRY HYST UVLO VINH VINH VINH VINH VINH VINH VINH VINH VINH VINH VINH VINH VINH VINH VINGP VING VINL 2 J2 FSET C3 (OPT) R6 E2 DRVCC 0 INTVCC K4 INTVCC VOUT>3.0V C4 (OPT) NOTE: UNLESS OTHERWISE SPECIFIED 2. ALL CAPACITORS ARE 0603. 1. ALL RESISTORS ARE 0603 TS1 COMP J1 U1 C5 100pF TS2 SW LTM4641EY COMP VOUT<=3.0V H10 SW VINL R35 E6 R5 100K TEMP (OPT) E5 INTVCC 1VREF PGOOD L1 PGOOD R31 C6 (OPT) R16 CIN5 OPT OFF OFF 4 D2 CIN4 4.7uF 50V 1210 OFF JP15 3 SS JP14 3 CCM JP13 1 NON-LATCH ON JP12 OVER-TEMP BEHAVIOR 3 JP11 ON INPUT OVLO 3 JP10 NON-LATCH INPUT OVP 3 INTVCC Q2 Si7164DP R15 2.2M R11 (OPT) CIN2 100uF 50V CIN3 4.7uF 50V 1210 2 2 2 VIN+ 2 2 A 8 7 6 5 3 2 1 2 1 2 A5 TEMP (OPT) VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT 100K M6 M5 M4 L6 L5 L4 K12 K11 K6 K5 J12 J11 J10 J9 J8 J7 J6 J5 B6 B10 C6 D2 H2 H1 D1 B9 C9 C10 C11 C12 D9 D10 D11 D12 E9 E10 E11 E12 R29 (OPT) R27 (OPT) R17 165K JP2 JP3 R1 13.7K 1.0V B 2512 1% 1VREF B THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. JP6 R20 2.94K + HZ SCALE = NONE YAN L. DATE: N/A SIZE 2.49K 0.1% TECHNOLOGY R26 C9 8.2nF 10 E17 VO- E16 E15 J4 J3 E12 J6 VOUT YAN L. VO+ VORB- VORB+ VO- VO- GND VOUT 0.8V - 6V @10A VO+ VO+ IOSTEP CLK DATE 6-22-11 APPROVED LTM4641EY DEMO CIRCUIT 1543A Monday, May 21, 2012 IC NO. SHEET 1 10A STEP-DOWN MODULE REGULATOR WITH INPUT AND OUTPUT OVP R OF 1 2 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only 10 CO5 47uF 10V 1210 R8 R12 1 E7 DESCRIPTION REVISION HISTORY PRODUCTION CO4 47uF 10V 1210 8.2nF C8 2.49K 0.1% R13 R3 10K TITLE: SCHEMATIC R23 576 6.0V JP8 2 REV CO3 47uF 10V 1210 J5 IOSTEP __ ECO R22 715 5.0V CO2 150uF 10V JP7 R21 1.18K 3.3V APPROVALS R19 4.12K JP5 1.8V 0.05 RS2 CO1 150uF 10V 2512 1% + 0.05 RS1 CO8 150uF 10V 1.5V JP4 + 1 1 DYNAMIC LOAD CIRCUIT Q1 SUD50N03-09P-E3 R18 7.15K 1.2V Q3 PH2625L C2 4.7uF CUSTOMER NOTICE JP1 VOUT SELECT 0.8V 4 TS3 CROWBAR 5 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. GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND OVPGM 1VREF VORB- VOSNS- VOSNS+ VORB+ CROWBAR R7 JP16 Latch Clear INTVCC R36 3 2 JP17 FSET M3 M2 M1 L3 K3 K1 2 3 4 5 1 3 SGND SGND SGND SGND SGND SGND J4 DRVCC SGND SGND SGND SGND SGND SGND SGND SGND SGND SGND C4 C3 C2 C1 B3 B2 B1 A3 A2 A1 C5 _LATCH GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND A7 A8 A9 A10 A11 A12 B7 B8 B11 B12 C7 C8 D6 D7 D8 E1 E2 E3 E4 E5 E6 E7 E8 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 G1 G2 G3 G4 G5 G6 G7 G8 G9 G10 G11 G12 H3 H4 H5 H6 H7 H8 H9 H11 H12 VINL 1 2 3 2 3 4 5 A B A DEMO MANUAL DC1543A SCHEMATIC DIAGRAM dc1543afa 7 DEMO MANUAL DC1543A 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 dc1543afa 8 Linear Technology Corporation LT 1112 REV A * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2011