DEMO MANUAL DC2351A LT8228 High Voltage, High Efficiency Bidirectional Synchronous Buck or Boost Converter with Input and Output Circuit Breakers DESCRIPTION Demonstration circuit 2351A is a high voltage, high efficiency synchronous buck or boost DC/DC converter. It is designed to have 36V to 56V on one side and 8V to 14V on the other side. It can supply a 35A maximum output current in buck mode and delivers 7A of current in boost mode. The demo board features the LT8228EFE controller. This part can seamlessly transition from bucking to boosting. With built-in circuit breaker function and other protection features, the LT8228 is ideal for high reliability systems requiring N+1 redundancy or other protections PERFORMANCE SUMMARY in industrial, automotive, medical, military, and avionics applications. The DC2351A is designed to be paralleled with other DC2351A boards to increase the total output current. With adequate heatsinking or airflow, the output current can be increased. Design files for this circuit board are available. All registered trademarks and trademarks are the property of their respective owners. Specifications are at TA = 25C Buck Mode SYMBOL V1 V2 Output Current fSW PARAMETER Supply Range Output Voltage Operating Frequency Efficiency CONDITIONS MIN 36 11.8 TYP 12 MAX 56 12.2 35 UNITS V V A kHz % MAX 14 49 7 UNITS V V A kHz % 150 96 48V to 12V at 37A Boost Mode SYMBOL V2 V1 Output Current fSW PARAMETER Supply Range Output Voltage Operating Frequency Efficiency CONDITIONS 12V to 48V at 9A MIN 8 47 TYP 48 150 94 BOARD PHOTO Rev. 0 1 DEMO MANUAL DC2351A QUICK START PROCEDURE It is highly recommended that the user first evaluates the board in buck mode only, then in boost mode only before moving to bidirectional evaluation. In bidirectional operation, make sure that the any power supply connected to V1 or V2 is reverse current protected or capable of sinking current. A battery or bank of super caps may also be required to compensate for a slow turn on time the power supply may have. Further, for ease of evaluation, it is recommended to start with a minimum load of 1A in buck mode. Refer to the following procedure: 1.Tie DRxN pin to INTVCC. Header H1 pins 9 and 13. 2.With power off, connect the input power supply to V1 (48V) and GND (input return). 3.Connect the 8.0V to 14V output load between V2 andGND. 5.Turn on the V1 power supply and then check for the proper V2 voltage. V2 should be between 8.0V to 14V, depending on the type of load. 6.Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage and otherparameters. 7.Once you have completed evaluating buck mode of operation, reverse the connections by connecting a source to V2 (12V) and a load to V1. Tie DRxN pin to GND. Header pins 9 and 14. 8.Once satisfied, the user can now evaluate in bidirectional mode of operation by either directly driving the DRxN pin or floating DRxN and letting the LT8228 selfdetermine the operating mode. 4.Connect the DVMs to the input and the output. Rev. 0 2 DEMO MANUAL DC2351A 100 100 94 94 88 88 82 82 EFFICIENCY (%) EFFICIENCY (%) QUICK START PROCEDURE 76 70 64 58 52 70 64 58 52 46 40 76 VIN = 48V, VOUT = 14V, fSWITCH = 100kHz 0 5 10 15 20 25 30 OUTPUT CURRENT 35 40 46 40 VIN = 12V, VOUT = 56V, fSWITCH = 100kHz 0 dc2351a F01 1 2 3 4 5 6 7 8 OUTPUT CURRENT (A) 9 10 dc2351a F02 Figure1. Buck Mode Efficiency Figure2. Boost Mode Efficiency Figure3. Test Set Up of DC2351A Rev. 0 3 DEMO MANUAL DC2351A QUICK START PROCEDURE V1 VOLTAGE 53V TO 48V V2 VOLTAGE 12V TO 13V V2 CURRENT -37A TO + 37A dc2351a F04 Figure4. Transition from Boost to Buck (Current = 25A/Div) V1 VOLTAGE 48V TO 53V V2 VOLTAGE 13V TO 12V V2 CURRENT -37A TO + 37A dc2351a F05 Figure5. Transition from Buck to Boost (Current = 25A/Div) Rev. 0 4 DEMO MANUAL DC2351A QUICK START PROCEDURE Figure6. Configuring 2 Boards for 2-Phase Parallel Operation Connect iShare and DRxN pins together. Feed external clock to synchronize boards to the sync input pin on the header. Load and source connections the same as Figure3. V2 VOLTAGE 13V TO 13V V1 VOLTAGE 53V TO 48V V1 VOLTAGE 48V TO 53V V2 VOLTAGE 12V TO 13V V2 CURRENT -50A TO + 74A V2 CURRENT +74A TO -74A dc2351a F07 Figure7. Transition from Boost to Buck (Current = 50A/Div) dc2351a F08 Figure8. Transition from Boost to Buck (Current = 50A/Div) Rev. 0 5 DEMO MANUAL DC2351A QUICK START PROCEDURE Figure9. Configuring 4 Boards for 4-Phase Operation Connect iShare and DRxN pins together. Feed external clock to synchronize boards to the sync input pin on the header. Load and source connections the same as Figure3. V1 VOLTAGE 53V TO 48V V1 VOLTAGE 53V TO 48V V2 VOLTAGE 12V TO 13V V2 VOLTAGE 12V TO 13V V2 CURRENT -150A TO + 150A V2 CURRENT -150A TO + 150A dc2351a F10 Figure10. Transition from Boost to Buck (Current = 50A/Div) dc2351a F11 Figure11. Transition from Boost to Buck (Current = 50 A/Div) Rev. 0 6 DEMO MANUAL DC2351A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 2 C1, C3 CAP., 15F, X7S, 100V, 20%, 2220, AEC-Q200 CGA9P3X7S2A156M250KB 2 1 C2 CAP., 1000pF, C0G, 100V, 5%, 0603, AEC-Q200 CGA3E2C0G2A102J080AA, C0603C102J1GACAUTO 3 2 C4, C5 CAP., 68F, ALUM, 80V, 20%, SMD, AEC-Q200 EEV-FK1K680Q 4 1 C7 CAP., 4.7F, X5R, 25V, 10%, 0603 GRM188R61E475KE15D, C1608X5R1E475K080AC 5 1 C8 CAP., 0.1F, X7S, 100V, 10%, 0603, AEC-Q200 CGA3E3X7S2A104K080AB 6 10 C10, C13, C35, C36, C37, C38, C39, C40, C41, C42 CAP., 22F, X7R, 25V, 20%, 1210, AEC-Q200 TMK325B7226MMHP, CGA6P3X7R1E226M250AB 7 1 C12 CAP., 100F, ALUM. ELECT., 25V, 20%, 6.3x7.7mm SMD, D8, AEC-Q200 EEHZA1E101XP 8 7 C15, C17, C18, C19, C20, C22, C23 CAP., 0.01F, X8R, 50V, 10%, 0603, AEC-Q200 GCM188R91H103KA37D, CGA3E2X8R1H103K080AA 9 1 C21 CAP., 2.2F, X7R, 10V, 20%, 0603 C1608X7R1A225M080AC 10 1 C24 CAP., 0.1F, X7R, 50V, 10%, 0603, AEC-Q200 CGA3E2X7R1H104K, CGA3E2X7R1H104K080AA 11 1 C25 CAP., 0.047F, X7S, 100V, 10%, 0603 C1608X7S2A473K080AB 12 1 C26 CAP., 0.22F, X7R, 50V, 10%, 0603, AEC-Q200 GCM188R71H224KA64D, CGA3E3X7R1H224K080AB 13 1 C27 CAP., 220pF, C0G, 50V, 5%, 0603 06035A221JAT2A, GCM1885C1H221JA16D 14 1 C28 CAP., 470pF, X7R, 10V, 10%, 0603 885012206006 15 6 C29, C30, C31, C32, C33, C34 CAP., 1F, X7R, 100V, 10%, 1206, AEC-Q200 CGA5L2X7R2A105K160AA 16 2 C43, C54 CAP., 4.7F, X7S, 100V, 10%, 1210, AEC-Q200 GCM32DC72A475KE02L, CGA6M3X7S2A475K200AB 17 4 C44, C45, C46, C47 CAP., 33F, X7S, 100V, 20%, 2220, AEC-Q200, PRELIM CAA572X7S2A336M 18 1 C48 CAP., 0.015F, X7R, 16V, 10%, 0603, HIGH RELIABILITY CGJ3E2X7R1C153K080AA 19 1 C53 CAP., 3300pF, X7R, 25V, 10%, 0603 06033C332KAT2A, C0603C332K3RACTU 20 1 C55 CAP., 2.2F, X7S, 16V, 10%, 0603, AEC-Q200 CGA3E1X7S1C225K080AC 21 1 C56 CAP., 1F, X7S, 100V, 20%, 0805 GRJ21BC72A105ME11L, C2012X7S2A105M, C2012X7S2A105M125AB 22 1 D1 DIODE, RECT., 400V, 1A, SOD123F, AEC-Q101 US1GWF-7 23 2 D2, D4 LED, GREEN, WATERCLEAR, 1206 150120GS75000 24 1 D3 LED, RED, WATERCLEAR, 1206 150120RS75000 25 1 D5 DIODE, TVS, 60V, 400W, DO-214AC 824501601 26 2 D6, D7 DIODE, SCHOTTKY, 100V, 1A, POWERDI-123, AEC-Q101 DFLS1100Q-7 27 4 E1, E2, E4, E5 TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THK 2501-2-00-80-00-00-07-0 28 2 E3, E6 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THK 2308-2-00-80-00-00-07-0 29 4 E7, E8, E9, E10 EVAL BOARD STUD HARDWARE SET, #10-32 720-0010 30 1 H1 CONN., RECPT, 1x14, 0.100" (2.54mm), TH SSW-114-01-G-S 31 1 H3 CONN., RECEPT, 1x4, 0.100" (2.54mm), TH SSW-104-01-F-S 32 1 J1 CONN., HDR, MALE, 1x2, 2mm, VERT, STR, THT, 10 Au TMM-102-02-L-S 33 1 JP3 CONN., HDR, MALE, 2x2, 2mm, VERT, STR, THT, 10 Au TMM-102-02-L-D 34 1 L2 IND., 10H, PWR, 20%, 60A, 1m, 36x31x41mm 7443763540100 35 1 LB1 LABEL SPEC, DEMO BOARD SERIAL NUMBER THT-96-717-10 36 4 M1, M2, M3, M4 XSTR., MOSFET, N-CHAN, 60V, 300A, PG-HSOF-8-1 IPT007N06NATMA1 Rev. 0 7 DEMO MANUAL DC2351A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 37 4 MP1, MP2, MP3, MP4 STANDOFF, NYLON, SNAP-ON, 0.25" (6.4mm) 8831702931000 38 1 PCB1 PCB, DC2351A 600-DC2351A 39 8 Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 XSTR., MOSFET, N-CH, 80V, 70A, PG-TDSON-8, AEC-Q101 IAUC70N08S5N074, IAUC70N08S5N074ATMA1 40 2 Q9, Q16 XSTR., MOSFET, N-CH, 60V, 220mA, SOT23-3, AEC-Q101 2N7002A-13, 2N7002A-7 41 6 R1, R9, R33, R47, R53, R54 RES., 0, 1/10W, 0603, AEC-Q200 ERJ3GEY0R00V, CRCW06030000Z0EA 42 4 R2, R3, R10, R11 RES., 1.5k, 0.1%, 1/10W, 0603, AEC-Q200 ERA-3AEB152V 43 1 R4 RES., 22.1k, 1%, 1/10W, 0603, AEC-Q200 NRC06F2212TRF, CRCW060322K1FKEA 44 2 R5, R48 RES., 10k, 1%, 1/10W, 0603, AEC-Q200 ERJ3EKF1002V, CRCW060310K0FKEA, CRCW060310K0FKEB, RK73H1JTTD1002F 45 1 R6 RES., 365k, 1%, 1/10W, 0603, AEC-Q200 RK73H1JTTD3653F, ERJ3EKF3653V, CRCW0603365KFKEA 46 2 R7, R14 RES., 60.4k, 1%, 1/10W, 0603, AEC-Q200 CRCW060360K4FKEA, ERJ3EKF6042V 47 2 R8, R18 RES., 12.1k, 1%, 1/10W, 0603, AEC-Q200 ERJ3EKF1212V, CRCW060312K1FKEA 48 1 R12 RES., 1.33k, 1%, 1/10W, 0603, AEC-Q200 ERJ3EKF1331V, CRCW06031K33FKEA 49 5 R13, R16, R19, R20, R26 RES., 24.3k, 1%, 1/10W, 0603, AEC-Q200 CRCW060324K3FKEA 50 1 R15 RES., 80.6k, 1%, 1/10W, 0603 CRCW060380K6FKEA, NRC06F8062TRF, RC0603FR-0780K6L 51 1 R17 RES., 5.62k, 1%, 1/10W, 0603 ERJ3EKF5621V, CRCW06035K62FKEA, RC0603FR-075K62L 52 1 R21 RES., 6.65k, 1%, 1/10W, 0603 NRC06F6651TRF, CRCW06036K65FKEA, RC0603FR-076K65L 53 3 R22, R24, R39 RES., 4.99k, 1%, 1/10W, 0603, AEC-Q200 ERJ3EKF4991V, CRCW06034K99FKEA, NRC06F4991TRF 54 2 R23, R25 RES., 40.2k, 1%, 1/10W, 0603, AEC-Q200 NRC06F4022TRF, CRCW060340K2FKEA, ERJ3EKF4022V 55 1 R27 RES., 68k, 1%, 1/10W, 0603 RC0603FR-0768KL 56 2 R28, R29 RES., 1k, 1%, 1/10W, 0603, AEC-Q200 CRCW06031K00FKEA, NRC06F1001TRF, ERJ3EKF1001V 57 1 R30 RES., 100k, 1%, 1/10W, 0603, AEC-Q200 CRCW0603100KFKEA, NRC06F1003TRF, ERJ3EKF1003V 58 3 R31, R32, R37 RES., 1 5%, 1/10W, 0603, AEC-Q200 ERJ3GEYJ1R0V 59 1 R36 RES., 499k, 1%, 1/10W, 0603, AEC-Q200 CRCW0603499KFKEA, NRC06F4993TRF, ERJ3EKF4993V 60 1 R38 RES., 316k, 1%, 1/10W, 0603, AEC-Q200 NRC06F3163TRF, CRCW0603316KFKEA 61 1 R50 RES., 1.21M, 1%, 1/10W, 0603, AEC-Q200 CRCW06031M21FKEA 62 1 RSNS1 RES., 0.002, 2%, 2W, 2512, LONG SIDE, AEC-Q200 KRL6432T4-M-R002-G-T1 63 1 RSNS2 RES., 0.002, 1%, 4W, 4026, 4-TERM., SENSE, AEC-Q200 CSS4J-4026K-2L00F 64 1 U1 IC, BUCK/BOOST CONTROLLER, TSSOP-38 LT8228EFE#PBF 65 1 U3 IC,LDO PWR LINEAR REG., MSOP-8 LT3010EMS8E#PBF, LT3010EMS8E#TRPBF Rev. 0 8 3.3v E3 R4 22.1k Q9 2N7002A E8 E2 1 INTVCC ISHARE GREEN D2 4.99k R39 1 J1 1 R32 E6 2 24.3k 24.3k 24.3k 24.3k 40.2k R25 C23 0.01uF 40.2k C22 0.01uF R23 C20 0.01uF R20 C19 0.01uF R19 C18 0.01uF R16 C17 0.01uF R13 C15 0.01uF 12.1k 1.33k R8 365k 60.4k 0 R6 2 24.3k R26 IMON2 IMON1 ISET2N ISET2P ISET1N ISET1P ENABLE C53 3300pF D5 R7 R53 0 R33 R48 10K 1 OPT R12 M3 R52 OPT 9 8 7 6 5 4 3 2 C9 V1D V1D BOOSTOUT 15uF C3 15uF C1 BOOSTOUT 1 E1 17 13 5 7 12 6 11 4 3 33 38 8 7 6 5 4 3 2 M4 ISHARE IMON2 IMON1 ISET2N ISET2P ISET1N ISET1P FB1 UV1. ENABLE DG1 SYNC 9 BOOSTOUT 100k R30 37 V1 D6 4.7uF C43 BIAS 2 1 68uF + C4 C5 68uF D7 C54 C44 33uF C24 0.1uF 0.015uF 68k R27 C25 V1D 1k R28 0.047uF C45 33uF C47 33uF BUCKOUT C46 33uF 4.7uF 2 C48 1 29 BIAS 36 V1D E7 2 1 3 2 470pF C28 OPT C6 1.5k R2 0.002 RSNS1 1.5k R3 1k R29 22 24 25 21 34 35 14 15 27 19 18 30 31 32 28 220pF C27 DRXN FAULT REPORT INTVCC V2 DG2 FB2 UV2 BG SNS2N SNS2P SW TG BOOST DRVCC 0.22uF C26 U1 2.2uF C21 1 2 3 4 H3 1 R37 C14 OPT 1 R31 0 R1 2 DRXN DRXN FAULT R11 1.5k R10 1.5k 0.1uF SW SYNC ISHARE REPORT C7 4.7uF D1 US1GWF-7 C8 INTVCC 1 1 IGND 20 SYNC 23 GND 39 SS 9 TMR 26 RT 16 2 SNS1N 1 SNS1P VC2 10 VC1 8 C29 1uF 6.65k R21 4 4 5 6 7 8 1 2 3 5 6 7 8 3.3V 1 2 3 2 RED D3 4.99k R24 1.214V Q2 C30 1uF Q1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 H1 1 4 R50 1.21M 4 Q3 1 IMON1 ENABLE REPORT SYNC R34 OPT J2 4 4 C32 1uF SW 9 EXTPWR FAULT DRXN IMON2 ISET1P ISET1N 2N7002A Q16 GREEN D4 4.99k ISHARE ISET2P ISET2N M5 1 R22 Q4 C31 1uF 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 2 1 Q5 2 4 1 3 4 C33 1uF EXT PWR JP3 Q6 M6 9 *FOR INTERNAL TESTING USE, NOT STUFFED 5 6 7 8 1 2 3 5 6 7 8 1 2 3 5 6 7 8 1 2 3 4 R35 OPT Q7 2.2uF C55 EXTPWR Q8 C34 1uF 3.3V 1 1 316k R38 499k R36 10uH L2 OPT L1 2 2 2 1 IN 5 BIAS M2 0 R47 9 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SIZE: N/A STANDOFF,NYLON,SNAP-ON,0.25" (6.4mm) STNCL1 www.linear.com Phone: (408)432-1900 TITLE: DEMO CIRCUIT SCHEMATIC, DATE: 09-30-19 PCA BOM: 700-DC2351A_REV01 PCA ASS'Y: 705-DC2351_REV01 SHEET 1 OF 710-DC2351A_REV02 SCHEMATIC NO. AND REVISION: 1 100V SYNCHRONOUS BUCK/REVERSE BOOST CONTROLLER W/ REVERSE INPUT & OUTPUT PROTECTION www.analog.com TOOL, STENCIL, 700-DC2351A REV0x REV02 STANDOFF,NYLON,SNAP-ON,0.25" (6.4mm) LB1 PCB, DC2351A STANDOFF,NYLON,SNAP-ON,0.25" (6.4mm) LABEL SPEC, DEMO BOARD SERIAL NUMBER MP4 PCB1 STANDOFF,NYLON,SNAP-ON,0.25" (6.4mm) MP3 E10 14V MP2 SCALE = NONE * SEE TABLE SKU NO. E5 E9 MP1 ALL RESISTORS AND CAPACITORS ARE 0603 PACKAGE. APPROVALS 22uF C10 22uF C13 E4 BUCK OUT / BOOST IN PCA ADDITIONAL PARTS BUCKOUT 1000pF C2 10K R5 + NOTE: UNLESS OTHERWISE SPECIFIED Rated Voltage = 100V 1uF C56 0 R9 BUCKOUT 8 7 6 5 4 3 2 CUSTOMER NOTICE 12.1k R18 80.6k R15 0 R54 OPT 9 8 7 6 5 4 3 2 + C12 C57 100uF OPT LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A PCB DES. MF CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO APP ENG. CG VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED IC NO. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR LT8228 TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. SENSE/ADJ SHDN 8 R51 60.4k R14 U3 LT3010-MS8E 5.62k R17 OUT OPT C16 0.002 RSNS2 M1 C35 C36 C37 C38 C39 C40 C41 C42 22uF 22uF 22uF 22uF 22uF 22uF 22uF 22uF 1 5 6 7 8 1 2 3 5 6 7 8 1 2 3 1 2 3 5 6 7 8 2 1 3 2 GND 9 GND 4 1 48V + BUCK IN / BOOST OUT DEMO MANUAL DC2351A SCHEMATIC DIAGRAM Rev. 0 9 DEMO MANUAL DC2351A ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. 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