DEMO MANUAL DC1778B-A LTC3883EUH Single-Phase, Step-Down DC/DC Controller with Digital Power Management DESCRIPTION Demonstration circuit 1778B-A is a single-output, synchronous buck converter featuring the LTC3883EUH, a single-output current mode controller with digital power management and input current sense capability. It senses output inductor current across a sense resistor. The board can be populated with the LTC3883EUH-1, which allows the user to provide bias power to the IC from an external power supply to save on-board LDO power loss. The output voltage of the board can be programmed from 0.5V to 5V, with output current up to 20A. The factory default setting for the output is 1.8V. The DC1778B-A powers up to default settings and produces power based on configuration resistors, or NVM, without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter aspects of the LTC3883. To fully explore the extensive digital PERFORMANCE SUMMARY power management features of the part, download the LTpowerPlay® GUI software 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 the LTpowerPlay for LTC3883 Quick Start Guide. Design files for this circuit board are available at http://www.linear.com/demo/DC1778B-A L, LT, LTC, LTM, Linear Technology, the Linear logo and LTpowerPlay are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C SYMBOL PARAMETER VIN Input Supply Range 6.5 12 24 V VOUT Output Voltage Range IOUT = 0A to 20A, VIN = 6.5V to 24V 0.5 1.8 5.0 V VOUT_ACC Output Voltage Range Accuracy IOUT = 0A to 20A, VIN = 6.5V to 24V, VOUT = 0.5V to 5.0V –0.5 0.5 % IOUT Output Current Range 0 20 A fSW Factory Default Switching EFF Peak Efficiency CONDITIONS VOUT = 1.8V, See Figure 6 MIN TYP MAX UNITS 425 kHz 91.4 % dc1778baf 1 DEMO MANUAL DC1778B-A QUICK START PROCEDURE Demonstration circuit 1778B-A makes it easy to set up to evaluate the performance of the LTC3883. Refer to Figure 3 for proper measurement equipment setup, and follow the procedure below. 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 C11. See Figure 5 for the proper scope probe technique. 1. Make sure jumpers are in the following positions: JUMPER JP1 6. Check for the correct output voltage. VOUT = 1.8V ± 0.5% (1.791V ~ 1.809V). 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 voltages are 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 for LTC3883 Quick Start Guide for detail. POSITION FUNCTION OFF Write Protection of LTC3883 JP2 FT3 GPIOB to Fault 3 (of the Connector) JP3 CTRL0 RUN to Control 0 (of the Connector) JP5 OFF EXTVCC_DRV: External VCC for the LTC3883-1 JP6 ON LED Indicator 2. With power off, connect the input power supply to VIN and GND. Connect active load to the output. 3. Make sure RUN switch (SW1) is OFF. 4. Turn on the power at the input. 5. Turn on the RUN switch as desired. CONNECTING A PC TO DC1778B-A You can use a PC to reconfigure the power management features of 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. NOTE: Make sure that the input voltage does not exceed 24V. +12V Power Supply USB CABLE VIN 12-PIN USB to I2C/PMBus Dongle CONNECTOR DC1613A LTC3883 Demo Board DC1778B-A VOUT LOAD dc1778b-a F01 Figure 1. Demo Setup with PC 2 dc1778baf DEMO MANUAL DC1778B-A QUICK START PROCEDURE Plug the dongle into the correct connector. The dongle can be hot plugged. DC1613A CONNECTOR Figure 2. Dongle Connector Locations SHUNT V VOUT LOAD RUN SWITCH A V POWER SUPPLY V Figure 3. Power Test Setup dc1778baf 3 DEMO MANUAL DC1778B-A QUICK START PROCEDURE Combining DC1778B-A with Other Digital Power Demo Boards The DC1778B-A may be plugged together in a multiboard array with other LTC digital power boards, using J6 and J7. Measuring Efficiency (See Figure 4) To accurately measure efficiency of any configuration, do the following: n n n 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. Obtain a DC1778B-A with an LTC3883-1 installed from your Linear Technology Field Applications Engineer. To use the on-board LDO to drive INTVCC, make the following modifications to the demo board: n Make sure R52 (bleeder resistor on bottom side of board) is not installed. Set JP6 to OFF to disable the regulator that provides power to LEDs. Measure VIN across the input ceramic capacitor (C7). Measure VOUT across the output ceramic capacitor (C11). n Set JP5 to ON so that U3 provides the 5V drive to INTVCC. U3 takes the place of the external power supply. Install R1. To accurately measure efficiency of a demo board containing an LTC3883-1: n Evaluating the LTC3883 When VIN Is Below 6V Drive INTVCC from an external source through the pin named: INT/EXTVCC. Set JP5 to OFF to disable U3. For applications using an input voltage within 4.5V to 6V, please install R5 to connect VIN directly to INTVCC. Please be aware that in this case VIN cannot exceed 6V, otherwise the chip will be damaged. n Evaluating the LTC3883-1 Measuring Output Ripple Voltage For applications that require the highest possible efficiency, the LTC3883-1 allows the user to supply the An accurate ripple measurement may be performed by using the configuration in Figure 5 across C11. n Measure VIN across the input ceramic capacitor (C7). Measure VOUT across the output ceramic capacitor (C11). JP6 R1 JP5 INTVCC/ EXTVCC 4 Figure 4. Jumper Locations: JP5, JP6, R1, INTVCC Turret dc1778baf DEMO MANUAL DC1778B-A QUICK START PROCEDURE + – COUT VOUT GND dc1778a F05 Figure 5. Measuring Output Voltage Ripple 92 91 90 89 EFFICIENCY (%) 88 87 86 85 84 12VIN, 1.8VOUT, 425kHz, RSENSE 83 12VIN, 1.5VOUT, 425kHz, RSENSE 82 12VIN, 1.2VOUT, 425kHz, RSENSE 81 12VIN, 1.0VOUT, 425kHz, RSENSE 80 0 5 10 OUTPUT CURRENT (A) 15 20 dc1778b-a F06 Figure 6. Typical Efficiency Curves, DC1778B-A Sense Resistor Current Sensing, 12VIN, fSW = 425kHz dc1778baf 5 DEMO MANUAL DC1778B-A QUICK START PROCEDURE LTpowerPlay Software GUI LTpowerPlay is a powerful Windows-based development environment that supports Linear Technology digital power ICs with EEPROM, including the 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’s DC1590B 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 7. LTpowerPlay Software GUI 6 dc1778baf DEMO MANUAL DC1778B-A GUI QUICK START PROCEDURE LTpowerPlay Software GUI The following procedure describes how to use LTpowerPlay to monitor and change the settings of the LTC3883. d.To change the output voltage to a different value, like 1.5V: In the Config tab, type 1.5 in the VOUT_COMMAND box, like this: 1. Download and install the LTpowerPlay GUI: http://linear.com/ltpowerplay 2. Launch the LTpowerPlay GUI. a. The GUI should automatically identify the LTC3883. The system tree on the left hand side should look like this: b.A green message box shows for a few seconds in the lower left hand corner, confirming that the LTC3883 is communicating: Then, click the “W” (PC to RAM) icon to write these register values to the LTC3883. After finishing this step, you will see the output voltage will change to 1.5V. If the write is successful, this message appears: c. In the tool bar, click the “R” (RAM to PC) icon to read the RAM from the LTC3883. This reads the configuration from the RAM of LTC3883 and loads it into the GUI. e. To save the changes into the NVM: In the tool bar, click the “RAM to NVM” button: f. Save the demo board configuration to a (*.proj) file by clicking the Save icon. Name it whatever you want. dc1778baf 7 DEMO MANUAL DC1778B-A GUI QUICK START PROCEDURE Loading a LTC3883 Configuration (*.proj) File with the GUI n n In the upper left hand corner of the GUI: File > Open > browse to your *.proj file. This will load the file into the GUI. n n Click the “Go On Line” button to link the GUI to the existing LTC3883, as this: Click on the “W” (PC to RAM) button. This loads the configuration into LTC3883 RAM. Then, you can save the configuration to the EEPROM. Please see previous step f for details. PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART # Required Circuit Components 1 5 C2, C10, C50, C6, C18 CAP., 0.1μF, X7R, 25V, 10%, 0603 TDK, C1608X7R1E104K080AA 2 4 C4, C5, C8, C34 CAP., 1μF, X5R, 25V, 10%, 0603 AVX, 06033D105KAT2A 3 4 C7, C9, C32, C33 CAP., 10μF, X5R, 35V, 10%, 1210 AVX, 1210DD106KAT2A 4 1 C29 CAP., 10μF, X5R, 25V, 10%, 1206 MURATA, GRM31CR61E106KA12L 5 2 C26, C27 CAP., 1μF, X7R, 25V, 10%, 1206 AVX, 12063C105KAT2A 6 2 C1, C25 CAP., 4.7μF, X5R, 10V, 10%, 0603 AVX, 0603ZD475KAT2A 7 3 C11, C12, C13 CAP., 100μF, X5R, 6.3V, 10%, 1210 AVX, 12106D107KAT2A 8 2 C14, C15 CAP., POSCAP, 330μF, 6.3V, 20%, 7343, D3L CASE PANASONIC, 6TPF330M9L 9 1 C3 CAP., ALUM., ELECT., 150μF, 35V, 20% SUN ELECTRONIC, 35HVP150M 10 2 Q1, Q6 XSTR., MOSFET, N-CH, 25V, 58A, TDSON-8 INFINEON, BSC050NE2LS 11 1 Q3 XSTR., MOSFET, N-CH, 25V, 100A, TDSON-8 INFINEON, BSC010NE2LSI 12 1 R23 RES., 24.9k, 1/10W, 1%, 0603 VISHAY, CRCW060324K9FKEA 13 1 R28 RES., 4.32k, 1/10W, 1%, 0603 VISHAY, CRCW06034K32FKEA 14 1 R2 RES., SENSE, 0.005Ω, 1W, 1%, 2512 PANASONIC, ERJM1WSF5M0U 15 2 R3, R4 RES., 100Ω, 1/10W, 1%, 0603 VISHAY, CRCW0603100RFKEA 16 7 R14, R16, R22, R33, R79, R83, R90 RES., 0, 1/10W, 0603 NIC, NRC06ZOTRF 17 3 R6, R84, R85 RES., 4.99k, 1/10W, 1%, 0603 VISHAY, CRCW06034K99FKEA 18 3 R7, R12, R13 RES., 1k, 1/10W, 1%, 0603 VISHAY, CRCW06031K00FKEA 19 8 R8, R9, R10, R11, R32, R53, R49, R61 RES., 10k, 1/10W, 1%, 0603 NIC, NRC06F1002TRF 20 3 R51, R55, R60 RES., 249Ω, 1/10W, 1%, 0603 VISHAY, CRCW0603249RFKEA 21 1 R52 RES., 30Ω, 1W, 1%, 2512 VISHAY, CRCW251230R0FKEG 22 1 R54 RES., SENSE, 0.05Ω, 1/2W, 1%, 2010 VISHAY, WSL2010R0500FEA 23 2 R56, R57 RES., 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA PANASONIC, ERJ3EKF1003V 24 1 R77 RES., 10Ω, 1/10W, 1%, 0603 VISHAY, CRCW060310R0FKEA 8 dc1778baf DEMO MANUAL DC1778B-A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART # 25 1 R58 RES., 3Ω, 1/10W, 1%, 0603 VISHAY, CRCW06033R00FKEA 26 1 R62 RES., 15.8k, 1/10W, 1%, 0603 VISHAY, CRCW060315K8FKEA 27 0 R17, R18, R5 (OPT) RES., OPTION, 0603 OPT. 28 2 R19, R20 RES., 0Ω, 1/10W, 0603 NIC, NRC06ZOTRF 29 2 R21, R27 RES., 100Ω, 1/10W, 1%, 0603 VISHAY, CRCW0603100RFKEA 30 1 L1 ND., HIGH FREQ. PWR., 0.2μH VITEC, 59PR9875 31 1 U1 IC, LTC3883EUH, QFN 6mm × 6mm LINEAR TECH., LTC3883EUH#10CB-1PBF-ES 32 0 C16 (OPT) CAP., OPTION, 0603 OPT. 33 1 C17 CAP., 1000pF, X7R, 25V, 10%, 0603 AVX, 06033C102KAT2A 34 1 R15 RES., SENSE, 0.002Ω, 1W, 1%, 2512 VISHAY, WSL25122L000FEA 35 0 R17, R18(OPT) RES., OPTION, 0603 OPT. 36 2 R19, R20 RES., 0Ω, 1/10W, 0603 NIC, NRC06ZOTRF 37 2 R21, R27 RES., 100Ω, 1/10W, 1%, 0603 VISHAY, CRCW0603100RFKEA 38 1 L1 IND., HIGH FREQ. PWR., 0.4μH VITEC, 59PR9875 39 1 U1 IC, LTC3883EUH, QFN 6mm × 6mm LINEAR TECH., LTC3883EUH#10CB-1PBF-ES CAP., POSCAP, 330μF, 4V, D3L OPT. Additional Circuit Components 1 0 C23, C28 (OPT) 2 1 C19 CAP., 680pF, X7R, 25V, 10%, 0603 AVX, 06033C681KAT2A 3 1 C20 CAP., 47pF, C0G, 50V, 5%, 0603 AVX, 06035A470JAT2A 4 1 C46 CAP., 0.01uF, X7R, 50V, 10%, 0603 AVX, 06035C103KAT2A 5 1 C24 CAP., 0.22uF, X5R, 25V, 10%, 0805 AVX, 08053D224KAT2A 6 2 C30, C31 CAP., 0.01uF, X5R, 50V, 10%, 0603 AVX, 06035D103KAT2A 7 1 D1 DIODE, SCHOTTKY, SOD-323 CENTRAL SEMI., CMDSH-3 TR LEAD FREE 8 2 D2, D4 LED, GREEN WATER CLEAR, 571nm @ 5mA, 4.5 ~28mcd @5mA, 0603 LITE ON LTST-C193KGKT-5A 9 1 D3 LED, RED, WATER CLEAR, 631nm @ 5mA, 7.1 ~45mcd @ 5mA, 0603 LITE-ON LTST-C193KRKT-5A 10 0 D9 (OPT) DIODE, SOD-323 OPT. 11 0 Q2 (OPT) XSTR., MOSFET SPEED SRS 30V 30A LFPAK OPT. 12 0 Q4 (OPT) XSTR., MOSFET JET SERIES LFPAK OPT. 13 1 Q5 XSTR., GP SS, PNP, 40V, SOT-23 ON SEMI., MMBT3906LT1G 14 2 Q7, Q10 XSTR., MOSFET, P-CH, 20V, 0.58A, SOT-23 VISHAY, SI2365EDS-T1-GE3 15 2 Q8, Q9 XSTR., MOSFET, N-CH, 60V, 115MA, SOT-23 FAIRCHILD, 2N7002 16 0 R1(OPT) RES., OPTION, 0805 OPT. 17 0 R5, R24-R26, R29-R31, R81, R82, R86, R87, R96 (OPT) RES., OPTION, 0603 OPT. 18 1 SW1 SWITCH, SUB MINIATURE SLIDE DPDT 6VDC 0.3A, THRU-HOLE C&K COMPONENTS, JS202011CQN 19 1 U5 I.C., EEPROM SERIAL-I2C, 2K-bit, TSSOP-8 MICROCHIP, 24LC025-I/ST 20 1 U3 I.C., LT1129CS8-5, S8 PACKAGE LINEAR TECH, LT1129CS8-5#PBF 21 1 U4 I.C., LT1129CS8-3.3 S8 PACKAGE LINEAR TECH. LT1129CS8-3.3#PBF dc1778baf 9 DEMO MANUAL DC1778B-A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART # Hardware 1 3 JP1, JP5, JP6 CONN., HEADER, 1×3, 2.54mm SAMTEC, TSW-103-07-L-S 2 3 JP1,JP5,JP6 SHUNT, 2.54mm SAMTEC, SNT-100-BK-G 3 2 TP24, TP25 CONN., JACK, BANANA, NON-INSULATED, 0.218" KEYSTONE, 575-4 4 2 TP26, TP27 STUD, FASTENER, #10-32 PEM, KFH-032-10 5 4 TP26, TP27 (×2) NUT, BRASS, #10-32 ANY 10-32M/S BR PL 6 2 TP26-TP27 RING, LUG, CRIMP, #10 KEYSTONE, 8205 7 2 TP26-TP27 WASHER, TIN PLATED BRASS, #10 ANY 10EXT BZ TN 8 1 J14 CONN RECEPT 2mm DUAL R/A 14POS (F) SULLINS, NPPN072FJFN-RC 9 1 J15 HEADER 14POS 2mm R/A GOLD (M) MOLEX, 87760-1416 10 1 J10 CONN., HEADER, 12POS, 2mm, STR DL, THRU-HOLE FCI, 98414-G06-12ULF 11 1 J9 CONN., BNC PC MOUNT RECEPT. JACK, 50Ω, TF-4 POST AMPHENOL CONNEX, 112404 12 21 TP1-TP9, TP11-TP22, TP28 TEST POINT, TURRET, 0.064" MTG. HOLE MILL-MAX, 2308-2-00-80-00-00-07-0 10 dc1778baf A B C D VDD25 GND OFF TP6 TP8 2 SC R29 OPT R28 4.32K DCR SENSE -B * 845 OPEN R17 R30 OPT R25 OPT 5 0 OPEN R18 R10 10K PGOOD R9 10K NOTE: FSW = 500 KHz FOR "A" VERSION FSW = 500 KHz FOR "B" VERSION R SENSE -A ASSY R24 OPT RUN GPIOB ALERTB SDA SCL R8 10K R23 24.9K SYNC R6 R7 4.99K 1K VDD33 VDD25 TP22 ON JP1 WP PGOOD VDD33 TP3 3 1 15 17 VOUT_CFG VTRIM_CFG 0 R19 DNC DNC VTRIM_CFG VOUT_CFG FREQ_CFG ASEL R15 0 0.002 0 4 100 R21 R27 845 100 C17 0.22uF 1nF ITH TSNS VSENSE- VSENSE+ ISENSE- ISENSE+ BG SW BOOST TG VIN_SNS IIN_SNS VIN INTVCC R5 BG ISENSE+ ISENSEVSENSE+ VSENSETSNS ITH 26 3 4 30 31 32 29 1.0 uF OPEN C16 R32 10k 0.55uH 0.4uH L1,L2 C20 47pF SW C19 680pF BOOST 22 R14 0 TG 23 IIN_SNS C6 0.1uF C2 100nF 24 1 2 28 OPT C1 4.7uF D1 R33 0.1uF C18 C34 1uF C31 0.01uF 1uF 0.005 R27 C16 R21 * * 4 * Q4 BSC011NE2LSI OPT 4 C8 100 R3 R2 * L1 R17 OPT Q2 BSC010NE2LSI 100 R4 CUSTOMER NOTICE 2. INSTALL SHUNTS AS SHOWN. 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. * * R18 2 YI S. APP ENG. 2 SCALE = NONE HZ PCB DES. APPROVALS 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. NOTE: UNLESS OTHERWISE SPECIFIED C17 * 4 Q3 BSC010NE2LSI BSC050NE2LS Q1 C7 10uF 4 C30 0.01uF EXTVCC_DRV PLACE Q5 CLOSE TO L1 100nF C9 10uF 3 OPT LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 0 Q5 C10 R58 R1 3 R20 OPT 6.3V DATE: N/A SIZE VOUT C32 10uF C14 330uF 6.3V + LTC3883EUH FAMILY Monday, December 21, 2015 1 DEMO CIRCUIT 1778B SINGLE PHASE DC/DC CONVERTER WITH INPUT CURRENT SENSE IC NO. TP25 R22 0 R16 0 GND GND TP9 ITH VSENSE- TP7 VSENSE- TP27 VSENSE+ TP5 VSENSE+ VOUT 0.9V -1.8V 25A TP26 SHEET 1 1 OF 3 REV. A B C VIN 6.5V - 14V D GND TP4 DATE 1-13-15 VIN TP24 TP2 VOUT YI S. APPROVED C15 330uF 6.3V + 150uF 35V + C3 VIN 1 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only C13 100uF TECHNOLOGY OPT 6.3V C12 100uF C33 10uF PRODUCTION DESCRIPTION REVISION HISTORY + C23 C11 100uF + C28 TITLE: SCHEMATIC * R19 * * 2512 R15 1 1 VIN REV ECO Figure 8. Demo Circuit 1778B-A Single-Phase DC/DC Converter with Input Current Sense OPEN 0 R20 C5 1uF VDD33 TP1 INT/EXTVCC U1 LTC3883EUH SHARE_CLK SYNC PGOOD RUN WP GPIO ALERT SDA SCL CURRENT SENSE CONNECTIONS OPEN R31 OPT 16 12 14 FREQ_CFG P1 13 20 5 10 11 ASEL SC SYNC PGOOD RUN 19 9 GPIOB WP 8 ALERTB 6 7 SCL R13 1K SDA R12 1K R26 P2 OPT R11 10K VDD25 C4 1uF 18 VDD25 21 VDD33 27 INTVCC 4 GND 33 PGND 25 5 1 2 3 5 1 2 3 5 1 2 3 5 1 2 3 5 DEMO MANUAL DC1778B-A SCHEMATIC DIAGRAM 11 dc1778baf A B C D GND TP19 4 3 2 1 SDA SCL WP VCC 24LC025-I/ST VSS A2 A1 A0 U5 TO DC1613A AUXP SDA GND SCL LGKPWR ALERTB GPIO_1 OUTEN_0 OUTEN_1 GND AUXSCL AUXSDA J10 100nF C50 5 5 6 7 EESDA EESCL EEWP 8 AUXVCC 1 2 3 4 5 6 7 8 9 10 11 12 3V3 R84 4.99K 2 ALERTB OPT 4 OPT R82 J15 SDA R81 TP11 ALERTB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 DEMO HEADER (M) FAULTB CTRL ALERTB SDA SHARE_CLK SCL RESETB AUXP UNUSED UNUSED GND GND 12V 12V SCL TP12 SDA TP13 SCL SC SYNC VIN R86 OPT 1206 R90 0 R87 OPT CUSTOMER NOTICE R96 OPT TP15 SYNC FAULTB CTRL ALERTB SDA SHARE_CLK SCL RESETB AUXP UNUSED UNUSED GND GND 12V 12V 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. YI S. APP ENG. 2 SCALE = NONE HZ PCB DES. APPROVALS J14 DEMO HEADER (F) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 R79 0 R83 0 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. VIN 3V3 TP14 SHARE_CLK DATE: N/A SIZE RUN OFF ON 2 LTC3883EUH FAMILY 1 DEMO CIRCUIT 1778A Monday, December 21, 2015 IC NO. SGND TP18 RUN RUN TP17 GPIOB GPIOB TP16 SHEET 2 2 OF 3 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only C46 10nF R77 10 TECHNOLOGY 5 SW1 R49 10.0K VDD33 1 SINGLE PHASE DC/DC CONVERTER WITH INPUT CURRENT SENSE TITLE: SCHEMATIC D9 OPT Figure 9. Demo Circuit 1778B-A Single-Phase DC/DC Converter with Input Current Sense R85 4.99K 3 ALL PARTS ON THIS PAGE ARE FOR DEMO BOARD ONLY, NOT NEEDED IN CUSTOMER DESIGN 4 4 1 12 6 3 5 A B C D DEMO MANUAL DC1778B-A SCHEMATIC DIAGRAM dc1778baf 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. A B C PULSE IN 5 VIN 3V3 VIN TP21 R53 10K 4 2 C26 1uF VDD33 R56 100K R62 15.8K 2 TP0101K Q10 R61 10.0K 3 OFF ON JP5 EXTVCC_DRV 5V SUPPLY FOR LTC3883-1 ONLY GND DO NOT EXCEED 5% DUTY CYCLE! TP20 Q6 BSC050NE2LS DYNAMIC LOAD CIRCUIT 8 7 6 5 OUTPUT SENSE/ADJ GND 1 2 3 4 TP28 IOUT TST LT1129CS8-5 4 1 J9 VSENSE+ C24 0.22uF NC 2 GPIOB D2 ALERTB VIN OFF ON JP6 LED 2 R57 100K 1 CUSTOMER NOTICE VIN LED SUPPLY 2N7002A Q8 GREEN GPIOB R51 249 C27 1uF D3 8 7 6 5 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. ALERT RED NC GND OUTPUT 4 1 2 3 YI S. APP ENG. 2 SCALE = NONE HZ PCB DES. APPROVALS LT1129CS8-3.3 VIN GND GND SHDN U4 PGOOD SENSE/ADJ TP0101K Q7 R55 249 +3.3V LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 1 LED INDICATOR CIRCUITS EXTVCC_DRV C25 4.7uF VOUT +3.3V C29 10uF DATE: N/A SIZE 1 LTC3883EUH FAMILY Monday, December 21, 2015 1 DEMO CIRCUIT 1778A SINGLE PHASE DC/DC CONVERTER WITH INPUT CURRENT SENSE IC NO. R52 30 1W 2512 OPT VOUT VOUT SHEET 3 2 OF 3 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only BLEEDER LOADS TECHNOLOGY 2N7002A Q9 GREEN TITLE: SCHEMATIC +3.3V 1 D4 PGOOD R60 249 +3.3V Figure 10. Demo Circuit 1778B-A Single-Phase DC/DC Converter with Input Current Sense VIN GND GND SHDN U3 R54 0.05 VSENSE- 3 ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN 2 3 4 5 VOUT 5 1 2 3 4 3 2 2 3 D 3 1 1 3 1 3 2 5 A B C D DEMO MANUAL DC1778B-A SCHEMATIC DIAGRAM dc1778baf 13 DEMO MANUAL DC1778B-A 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 14 Linear Technology Corporation dc1778baf LT 0216 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2016