DEMO MANUAL DC2278A LTC4281 Hot Swap Controller with I2C Compatible Monitoring Description Demonstration circuit 2278A features the LTC(R)4281 hot swap controller. The LTC4281 is well suited to high power applications because the precise monitoring capability and accurate current limiting reduces the extremes in which both loads and power supplies must safely operate. Non-volatile configuration allows for flexibility in the autonomous generation of alerts and response to faults. The LTC4281 provides a rich set of features to support hot swap applications including: nn 12-/16-Bit ADC Monitors Current, Voltage, Power and Energy nn I2C/SMBus Interface nn Non-Volatile Configuration and Logging Functions nn Generates Alerts on ADC Measurements Outside Limits nn Software Adjustable Current Limit with Foldback nn Three General Purpose Input/Outputs Available in a 28-pin 4mm x 5mm QFN package, the LTC4281 is showcased on DC2278A configured for a 12V, 50A application. The DC2278A-B has an included programming socket to allow programming an LTC4281 for prototyping purposes prior to its permanent installation on a PCB. The DC2278A-A does not have this socket. By changing a few passive components, 2.9V to 30V applications can easily be evaluated. Design files for this circuit board are available at http://www.linear.com/demo/DC2278A L, LT, LTC, LTM, Linear Technology, LTpowerPlay and the Linear logo are registered trademarks and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. VARIABLE POWER SUPPLY TEST LOADS DC2278 F01 Figure 1. Proper Measurement Equipment Setup dc2278af 1 DEMO MANUAL DC2278A Performance Summary PARAMETER Specifications are at TA = 25C CONDITIONS VALUE Input Supply Voltage Range 2.9V to 30V Nominal Operating Voltage 12.0V Overvoltage Lockout Nominal 15.0V Undervoltage Lockout Nominal 11.1V Output Current Limit Nominal 52.5A Maximum Load Capacitance Nominal 10,000F Timer Expiration Period Nominal 4ms Quick Start Procedure Table. Power Input and Output Connections NOMENCLATURE CONNECTOR DESCRIPTION 12VIN E1 12V Power In 12VOUT 50A E2 12V Power Out GND E21 (Banana) Power Supply Common NOMENCLATURE TURRET DESCRIPTION GPIO1 E3 GPIO1 Pin I/O Table 2. Test Points, Turrets VCC E4 Internal VCC 12VOUT E5 12VOUT Monitor 12VIN E6 12VIN Monitor ON (SHORT PIN) E7 ON Pin Monitor/Input SCL E8 I2C Serial Clock Input GND E9, E10, E15, E17 Ground SDA E11 I2C Serial Data Input/Output ALERT E12 ALERT Pin GPIO2 E13 GPIO2 Pin I/O GPIO3 E14 GPIO3 Pin I/O EXT 5V E16 TIMER E18 TIMER Pin UV E19 UV Pin OV E20 OV Pin GATE E22 GATE Pin NOMENCLATURE LED DESCRIPTION IN D1 (Green) Input Power Indicator OUT D2 (Green) Output Power Indicator GPIO1 D3 (Green) GPIO1 Logic Low Indicator Table 3. LED Indicators 2 dc2278af DEMO MANUAL DC2278A Quick Start Procedure Table 3. LED Indicators SOCKET POWER ON D4 (Red) Programming Socket SKT1 Powered ALERT D5 (Red) ALERT Pin Logic Low SCL D6 (Green) Serial Clock Active SDA D7 (Green) Serial Data Active GPIO3 D8 (Green) GPIO3 Logic Low GPIO2 D9 (Green) GPIO2 Logic Low JUMPER DESCRIPTION Table 4. Jumpers NOMENCLATURE CLK: INT, EXT JP1 Internal/External Clock Select ON: INTVCC, FLOAT, GND JP2 ON Input Select, VCC, Float (External), GND ADR0: H, NC, L JP3 Address Pin ADRO Select ADR1: H, NC, L JP4 Address Pin ADR1 Select ADR2: H, NC, L JP5 Address Pin ADR2 Select WRITE PROTECT: LOCK, WRITE JP6 Write Protect for EEPROM NOMENCLATURE CONNECTOR DESCRIPTION QuikEvalTM J1 Connection for DC590 Aux Demo Board DC1613 J2 Connection for DC1613 Aux Demo Board Table 5. Connectors Operating Principles Quick Start Procedure (Without Software) The LTC4281 is a low voltage, high current hot swap controller that has a 2.9V to 33V operating range and a 45V absolute maximum voltage for the VDD pin. This demo circuit is populated for 12V operation, but it can easily be readjusted for any voltage between 2.9V and 30V by replacing R1, R2, and R7 (top resistors in the UV/OV divider and the FB divider). The DC2278A as supplied by the factory is populated with a pair of PSMN1R5-30BLE MOSFETs in D2PAK packages. A total of five 2.5m sense resistors are used, providing typically 50A of load current. The current limit and circuit breaker thresholds can be adjusted by changing the sense resistors R52, R57, R62, R67 and R72 and/or the value of VSENSE via addressable registers in the LTC4281. Several locations for MOSFET packages as well as additional sense resistors are available on the front and rear of the PCB for higher current configurations. DC2278A is easy to set up to evaluate the performance of the LTC4281. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below. WARNING The DC2278A is capable of operation in excess of 50A. At this current and power level, there is a danger of serious personal injury and equipment damage if proper techniques are not used. All cabling between the power supply and the load should be capable of handling the current levels used. Additionally, the high currents and fast transients can cause unexpected voltage drops in cables connecting the test equipment to the DC2278A due to parasitic resistance and inductance. The cable drops may cause ground loops for the current via various cables and scope probes. This will cause unexplained ringing, distorted oscilloscope waveforms, voltage and current spikes, and signals appearing to be below ground. dc2278af 3 DEMO MANUAL DC2278A Quick Start Procedure A common sneak path for current is the third wire grounds used on power cords of test equipment in use. Using ground lifting connectors at the wall outlet won't necessarily alleviate these effects since most equipment has line bypassing capacitors between the mains voltage and local chassis ground. Isolating test equipment using line isolation transformers with low primary to secondary capacitance is recommended. Probe ground leads may intercept induced fields from the high current paths and should be minimized or avoided Another method to remove these artifacts is the use of a differential scope probe connected between the signal to be observed and a ground connection located close to the point of measurement. Also be careful to not allow an open ground from the power supply or load to cause return current through the grounds of the various devices connected to the demo board. This may present a fire hazard or cause damage to the test equipment. UV/OV Thresholds With no load on the output, slowly increase the voltage on the input to the board. Observe the input voltage when LED D2 (OUT) illuminates. This voltage should be between 10.7V and 11.4V. Continue increasing the voltage until D2 is extinguished. This should occur between 14.4V and 15.3V. Output Voltage Slew Rate With no load connected, observe the output voltage between turret 12VOUT (E5), and GND. Apply 12V to the 12VIN connector. The output voltage should slew from 0V to 12V in 10ms to 25ms. Output Current Limit Jumper Positions JUMPER NAME POSITION JP1 CLK EXT JP2 ON INTVCC JP3 ADR0 NC JP4 ADR1 NC JP5 ADR2 NC JP6 WRITE PROTECT LOCK Powering Up Connect power supply capable of 60A at 0V to 20V to the 12V input as shown in Figure 1. Verify cabling shown in extra bold lines is capable of carrying 60A safely. The GND connection does not handle high current so no high current cabling is required. Generally, an electronic load will be used. If this is true, use it in the constant resistance mode. Use in constant current will prevent start up because of current foldback in the LTC4281. Current foldback is used to minimize 4 dissipation in the MOSFETs used as pass devices with the LTC4281. To affect this, current is initially limited to approximately 1/3 of full limit until the output voltage is above 10V. If a constant current load is used and set to 50A, the LTC4281 will not start up and a current fault will be reported. Turn off power supply and connect electronic load to the DC2278A as shown in Figure 1. Disable electronic load. Adjust power supply to 12V and verify its current level is set to >60A. Slowly increase conductance of the electronic load while monitoring current. As the load increases to around 50A, the output voltage and current will fall to zero. Note the current where this occurs. This should be 47.5A to 52.5A. Ability to Charge Output Capacitor Turn off power supply and disconnect electronic load. Replace load with a 10,000F capacitor rated at 15V or greater. Turn on power supply and observe that the output voltage rises to 12V indicating the DC2278A has connected to the load and successfully charged the output capacitance. Monitor the current during the period when the capacitor is charging, it should be a maximum of 12A. dc2278af DEMO MANUAL DC2278A Quick Start Procedure Software Control with LTpowerPlay(R) LTpowerPlay is a convenient PC software GUI that gives complete access to the registers of the LTC4281, and many other Linear Technology power system management parts. Use it in offline mode to build a system configuration file even with no hardware plugged-in, and use it with hardware connected to configure and debug your application. LTpowerPlay communicates using the I2C bus in the demo system (covered in this manual), or in your real-world product environment. It provides unprecedented control over the Linear Technology ICs on the I2C bus. Use it during board bring-up to tune and optimize the power system parameters. Use it during system debug to view critical system information and troubleshoot board design or manufacturing issues. LTpowerPlay includes extensive help and documentation under the help menu. Online help includes quick start videos and tutorials, and detailed technical documentation from the Linear Technology website. Getting started with LTpowerPlay is easy. Simply download and install the PC software from here: http//www.linear.com/ltpowerplay Figure 2. DC2278A-A Demo Board Connected to DC1613 I2C-to-USB Converter dc2278af 5 DEMO MANUAL DC2278A Quick Start Procedure The DC1613 USB-to-I2C adapter interfaces the PC running LTpowerPlay to the DC2278A board. Connect the DC1613 adapter to the PC through a USB cable, and connect the DC2278A board through the ribbon cable to connector J2 (Figure2). Launch the LTpowerPlay GUI on the PC. The software identifies the DC1613 controller, then the DC2278A board, and begins communicating through the I2C bus with the LTC4281. Once this communication has been established, the GUI displays its main window (Figure 3). The LTpowerPlay GUI divides information into separate panes in the window. On the left is the system tree pane (Figure 4), displaying a list of all Linear Technology devices identified on the I2C bus. For a single LTC4281 device, the tree is small, but if other supported devices are present on the I2C bus, LTpowerPlay will add them. Click on a device in this list to selectively access it. Information in other panes pertains to the selected device. LTpowerPlay System Tree Figure 4. LTpowerPlay System Tree To the right of the system tree is the configuration register pane. The Figure 5 view shows all of the writable userconfigurable registers available on the selected device. The GUI offers clickable buttons and fields to edit the information in these registers. Figure 3. LTpowerPlay GUI Window 6 dc2278af DEMO MANUAL DC2278A Quick Start Procedure Figure 5. LTpowerPlay Configuration Registers Update register contents by clicking or typing to change the desired registers. Then selecting the PC to RAM button in the top toolbar (Figure 6). LTpowerPlay writes changes to the updated registers. Right of center in LTpowerPlay is the telemetry pane (Figure 7), displaying read-only information contained in the status registers of the selected part. The GUI periodically polls the I2C bus and updates the telemetry content, along with a user-friendly interpretation of the bits. Figure 6. PC to RAM Button dc2278af 7 DEMO MANUAL DC2278A Quick Start Procedure Figure 7. LTpowerPlay Telemetry In the upper right corner of LTpowerPlay is the chip dashboard pane (Figure 8), displaying a graphical representation of the part status in a friendly, easy-to-understand format. The meter in the upper left of the panel displays the static input energy to the card in watts. The small dials in the center of the input energy meter display the energy used in kilojoules. The VSOURCE meter displays the voltage at the SOURCE pin of the LTC4281, which is the same as VOUT. The Input meter displays the voltage input at the VDD pin of the LTC4281. VSENSE indicates the input current derived by dividing the voltage measured across the sense resistor by the value of the sense resistor. The power meter displays the SOURCE voltage multiplied 8 by the current sense voltage and scaled to indicate the power in watts. VGPIO3 displays the voltage at GPIO3 when it is configured as an analog input. The FET Status annunciators show the status of the pass MOSFETs as described in the FET-Bad Fault section of the data sheet. GPIO1, GPIO2 and GPIO3 show the status of the general purpose input/output pins. On the lower right of the GUI window is the telemetry plot pane (Figure 9). By selecting various measurement functions in the telemetry pane, a graphic display of that function versus time is displayed. This gives an instant indication on how that function varies with time. dc2278af DEMO MANUAL DC2278A Quick Start Procedure Figure 8. LTpowerPlay Chip Dashboard dc2278af 9 DEMO MANUAL DC2278A Quick Start Procedure Figure 9. LTpowerPlay Telemetry Plot 10 dc2278af DEMO MANUAL DC2278A Quick Start Procedure LTC4281 CHIP COMPUTER WITH LTpowerPlay I2CBUS STORE RAM RESTORE EEPROM LTC4281 LOGIC Figure 10. LTC4281 RAM and Non-Volatile Memory The LTC4281 is highly configurable through its register set. Refer to the LTC4281 data sheet for a complete discussion of the registers and functions available. Get immediate access to detailed help for the selected register in LTpowerPlay by pressing the F1 key on your keyboard. The LTC4281 features non-volatile EEPROM that holds device configuration information and a snapshot of past fault information. When the part receives power it executes a power-on reset, and restores the contents of the EEPROM to its operating RAM. Following this power-on restore, operating RAM can be modified with I2C bus commands that modify the part behavior. These modifications are effected by using the PC>RAM button in the toolbar. Also included in the toolbar are buttons for reading the internal RAM data on the PC by using the RAM>PC button on the tool bar. Similarly, there are buttons for moving the contents of the RAM to the NVM (EEPROM) and vice versa using the RAM>NVM and NVM>RAM buttons on the toolbar. Programming Socket The DC2278A-B board includes a programming socket. This socket in conjunction with the LTpowerPlay software GUI and DC1613 USB-to-I2C adapter may be used to program the EEPROM of multiple LTC4281 ICs prior to their installation on a PC board. Please refer to Application Note 145, http://cds.linear.com/ docs/en/application-note/AN145f.pdf, and refer to Option 1A. Use the device address 0x88, which is the address to which the programming socket is hard wired. Also verify that the LTC4281 already soldered on the board (U1) is set to a different address than 0x88 to prevent a conflict. Follow the instructions for Option 1A on page 3 of Application Note 145. Figure 11. Read Write NVM Buttons on Toolbar dc2278af 11 DEMO MANUAL DC2278A Parts List ITEM QTY 1 2 REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER C1, C8 CAP., OPTION, ALUM. ELECT., SMD OPTION 2 2 C2, C3 CAP., 33pF, X7R, 16V, 5%, 0603 AVX, 0603YC330JAT2A 3 1 C4 CAP., OPTION, 0603 OPTION 4 2 C5, C9 CAP., 0.1F, X7R, 16V, 10%, 0603 AVX, 0603YC104KAT2A 5 1 C6 CAP., 4.7F, X5R, 16V, 10%, 0603 TDK, C1608X5R1C475K080AC 6 1 C7 CAP., 0.068F, X7R, 16V, 10%, 0603 AVX, 0603YC683KAT2A 7 1 C10 CAP., 0.027F, X7R, 50V, 10%, 0603 AVX, 06035C273KAT2A 8 1 C11 CAP., 0.1F, X7R, 25V, 20%, 0603 TDK, C1608X7R1E104M080AA 9 1 C12 CAP., 0.022F, X7R, 50V, 5%, 0805 KEMET, C0805C223J5RACTU 10 7 D1-D3, D6-D9 LED, GREEN, WATERCLEAR, 0805 WURTH ELEKTRONIK, 150080GS75000 11 2 D4, D5 LED, RED, WATER CLEAR, 2 PIN SMD LITE-ON TECHNOLOGY CORP, LTST-C170EKT 12 4 D10-D13 DIODE, TVS, 28V, 1500W, SMC DIODES INC., SMCJ28A-13-F 13 2 E1, E2 LUG, TONGUE, OFFSET FLOATING, ONE HOLE PENCOM, EL1664 14 19 E3-E20, E22 TEST POINT, TURRET, 0.064" MTG. HOLE, 0.125" THICK PCB MILL-MAX, 2308-4-00-80-00-00-07-0 15 1 E21 CONN., BANANA JACK, FEMALE, THT, NONINSULATED, SWAGE KEYSTONE, 575-4 16 1 J1 CONN., HDR., MALE, 2x7, 2mm, THT, VERT, SHROUDED MOLEX, 87831-1420 17 1 J2 CONN., HDR., SHROUDED, 2X6, 2mm, THT, VERT FCI, 98414-G06-12ULF 18 2 JP1, JP6 CONN., HDR., MALE, 1X3, 2mm, THT, STRT SAMTEC, TMM-103-02-L-S 19 4 JP2-JP5 CONN., HDR., MALE, 1X4, 2mm, THT, STRT SAMTEC, TMM-104-02-L-S 20 1 LB1 LABEL SPEC, DEMO BOARD SERIAL NUMBER BRADY, THT-96-717-10 21 4 MP1-MP4 BUMPER, RECESSED, #4 SCREW, BLACK KEYSTONE, 727 22 4 MP5-MP8 WASHER, FLAT, #4, SS 18-8 PENCOM, WA1021 23 4 MP9-MP12 SCREW, MACHINE, #4-40 X 1/2, PHILLIPS PH, SS PENCOM, SC3389 24 4 MP13-MP16 WASHER, LOCK, INT. TOOTH, #4, SS PENCOM, WA1196 25 4 MP17-MP20 NUT, HEX, #4-40, SS 18-8 PENCOM, NU1043 26 2 MP21, MP22 SCREW, MACHINE, 1/4-20 X 7/8, HEX WASHER HEAD, SS PENCOM, SE6037 27 4 MP23-MP26 WASHER, FLAT, SS 18-8, 1/4 IN. PENCOM, WA3491 28 2 MP27, MP28 WASHER, LOCK, INT. TOOTH, 1/4 IN., SS PENCOM, WA1374 29 2 MP29, MP30 NUT, HEX, 1/4-20, SS 18-8 PENCOM, NU1006 30 1 PCB1 PCB, DC2278A MAO BANG, 600-DC2278A 31 2 Q1, Q2 XSTR., MOSFET N-CHAN, 30V, 120A, D2PAK NXP SEMICONDUCTORS, PSMN1R5-30BLE 32 3 Q3-Q5 XSTR., MOSFET N-CH, 60V, 300mA, SOT-23 VISHAY, 2N7002K-T1-GE3 33 1 Q6 TRANSISTOR, MOSFET, N-CH., SO-10, OPTIONAL ST MICROELECTRONICS, STV300NH02L 34 2 Q7, Q8 MOSFET, N-CH, OPTION OPTION 35 1 Q9 TRANSISTOR, MOSFET, N-CH., SOT-669OPTIONAL NXP, PSMN2R0-30YLE 36 1 R1 RES., 34.8k, 1%, 1/10W, 0603 VISHAY, CRCW060334K8FKEA 37 1 R2 RES., 1.18k, 1%, 1/10W, 0603 YAGEO, RC0603FR-071K18L 38 1 R3 RES., 3.4k, 1%, 1/10W, 0603 NIC, NRC06F3741TRF 12 dc2278af DEMO MANUAL DC2278A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 39 5 R4-R6, R17, R18 RES., 10k, 5%, 1/4W, 1206 PANASONIC, ERJ8GEYJ103V 40 1 R7 RES., 30.1k, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF3012V 41 4 R8, R10, R11, R21 RES., 3.01k, 1%, 1/10W, 0603 VISHAY, CRCW06033K01FKEA 42 8 R9, R19, R20, R23, R24, R34- R36 RES., OPTION, 0603 OPTION 43 4 R12-R14, R22 RES., 5.11k, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF5111V 44 8 R15, R16, R25, R26, R31-R33, R38 RES., 0, 1/10W, 0603 VISHAY, CRCW06030000Z0EA 45 6 R27-R30, R39, R73 RES., 10, 5%, 1/10W, 0603 PANASONIC, ERJ3GEYJ100V 46 1 R37 RES., 2k, 1%, 1/10W, 0603 NIC, NRC06F2001TRF 47 24 R40, R41, R43-R46, R48, R49, R77-R79, R81-R86, R88-R91, R93-R95 RES., OPTION, 0402 OPTION 48 5 R42, R47, R80, R87, R92 RES., OPTION, 2512 OPTEK TECHNOLOGY (TT ELECTRONICS), LRMAT2512-R003FT4 49 20 R50, R51, R53-R56, R58-R61, R63-R66, R68-R71, R74, R75 RES., 1, 1%, 1/16W, 0402 VISHAY, CRCW04021R00FKED 50 5 R52, R57, R62, R67, R72 RES., METAL ELEMENT, 0.0025, 1%, 3W, 2512 TT ELECTRONICS, ULRG3-2512-R0025-F-LFSLT 51 1 R76 RES., 59k, 1%, 1/10W, 0603 VISHAY, CRCW060359K0FKEA 52 1 SKT1 CONN., SOCKET, CLAMSHELL, 28 LEAD, SMT, 5x4mm QFN PLASTRONICS, 28QN50S25040 53 6 TP1, TP2, TP4, TP5, TP7, TP8 TESTPOINT, PCB COPPER FEATURE N/A 54 1 U1 IC, HI-CURRENT HOT SWAP CONTROLLER, QFN LINEAR TECHNOLOGY, LTC4281IUFD#PBF 55 1 U2 IC, MEMORY, EEPROM, 2k-bit, 400kHz, TSSOP-8 MICROCHIP, 24LC025-I/ST 56 6 XJP4-XJP6, XJP10-XJP12 CONN., SHUNT, FEMALE, 2 POS, 2mm SAMTEC, 2SN-BK-G 57 1 Y1 CRYSTAL, 4 MHz, 18pF, 50ppm, 11.4mmx4.7mm, 2Pad SMD ABRACON CORPORATION, ABLS-4.000MHZB4-T 58 1 Y2 RESONATOR, 4MHz, SMT, OPTION MURATA, CSTCR4M00G53-R0 (OPTION) 59 3 Z1-Z3 DIODE, ZENER, 5.1V, 500mW, SOD-123 FAIRCHILD, MMSZ5231B dc2278af 13 1 2 3 ON E17 E16 E12 E8 E11 E9 E7 AUXP SDA GND SCL LGKPWR ALERTB GPIO_1 OUTEN_0 OUTEN_1 GND AUXSCL AUXSDA J2 DC 1613 GND GND GND GPIO EEVCC EESDA EESCL EEGND CS SCK/SCL MOSI/SDA MISO VCCIO VUNREG J1 TM Quik Eval GND EXT 5V ALERT SCL SDA GND (SHORT PIN) 1 2 4 1 2 3 4 5 6 7 8 9 10 11 12 3 8 13 14 10 9 11 12 6 4 7 5 2 1 2 A SCL SDA R26 0 SCL +5V +5V SCL SDA D1 IN GREEN R5 10k SDA 1 D11 SMCJ-28A 2 1 R25 0 +5V +5V SCL SDA GPIO3 D8 GPIO3 GREEN Z3 MMSZ5231B 5.1V 1 2 R6 10k 2 R24 OPT R4 10k R23 OPT GPIO2 R3 3.4k TIMER GPIO2 D9 GPIO2 GREEN C6 4.7uF E18 C11 0.1uF Z2 MMSZ5231B 5.1V 1 2 R2 1.18k GPIO1 1 B H TIMER INTVCC ALERT SCL SDAO SDAI OV UV 4 3 2 1 SCL WP VCC TP1 JP5 4 3 2 TP2 VSS SDA A2 A1 A0 SENSE+ 5 6 7 8 ADC- SENSE- GATE SOURCE U1 LTC4281-UFD ADR2 1 U2 24LC025-I/ST C9 0.1uF L NC 6 5 15 14 13 12 2 28 C7 0.068uF OV UV E20 E19 R1 34.8k INPUT ADC+ 23 E1 1 ON 27 VDD 26 ADC+ 25 SENSE+ JP4 4 3 2 1 R12 5.11k 11 ADR2 10 ADR1 +12V IN SENSE- 24 ADCADR0 R13 5.11k ADR1 9 WP 4 22 R14 5.11k CLKIN GPIO3 GPIO2 GPIO1 FB CLKOUT C ADR0 JP3 4 3 2 1 C 21 GATE EXPOSED PAD 29 SOURCE GND 3 GND 19 L C2 33pF C3 33pF +5V R22 5.11k WRITE LOCK 1 Q3 2N7002 JP2 RED D5 ALERT R21 3.01k 2 Y2 OPT GND GPIO3 GPIO2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. D DC2278A-A DC2278A-B SKU NO. 3 2 1 +5V GPI01 INT VCC GND E15 E4 GPI03 E14 GPI02 E13 E3 +12V OUT 50 AMPS +12V OUT INTVCC E2 E5 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only STUFFED SKT 1 ( PAGE 3 ) NOT STUFFED DC2278A-B LTC SKU# ASSEMBLY OPTIONS GND DC2278A-A PCA ASS'Y DWG: 705-DC2278A_REV02 DATE: Tuesday, May 10, 2016 SCALE = NONE SIZE: 11X17 E SHEET 1 710-DC2278A_REV02 OF 4 SCHEMATIC NO. AND REVISION: HIGH CURRENT HOT SWAP CONTROLLER WITH I2C COMPATIBLE MONITORING AND EEPROM TITLE: DEMO CIRCUIT SCHEMATIC, SDA E21 2. ALL CAPACITORS THIS PAGE ARE 0603. 1. ALL RESISTORS THIS PAGE ARE 1% 0603. D7 GREEN SCL R15 0 R16 0 Z1 MMSZ5231B 5.1V E UNLESS OTHERWISE NOTED: R20 OPT 2 1 R11 3.01k R19 OPT D3 GPIO1 GREEN R17 10k Q5 2N7002 EXT INT D6 GREEN 1 JP1 CLK D2 OUT GREEN SCL R10 3.01k APPROVALS 1 R18 10k GPIO1 Q4 2N7002 FLOAT INTVCC E10 4 3 2 1 ON GND CUSTOMER NOTICE 3 2 1 WRITE PROTECT JP6 Y1 4 MHz R9 OPT (300K) INTVCC = HIGH-CURRENT CONNECTIONS D M.HAWKINS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A PCB DES. CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; BOB SMITH HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO APP ENG. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL IC NO. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED LTC4281-UFD CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. NC H 7 8 16 17 18 20 C4 (0.1u) OPT R8 3.01k R7 30.1k 1 2 CONNECTIONS TO PAGES 2 AND 3 1 3 2 B 3 2 3 2 1 2 1 2 1 2 1 A 3 +12V IN 2 2 14 1 E6 1 2 3 4 DEMO MANUAL DC2278A Schematic Diagram dc2278af 1 2 3 + INPUT A NICHICON P/N UVR1E102MPD OR EQUIVALENT C8 OPT 1000 uF INPUT 1 2 4 TP4 TP5 D10 SMCJ-28A SENSE+ ADC+ ADC+ ADC+ SENSE+ SENSE+ 1 2 1 2 OPT R84 D13 SMCJ-28A OPT OPT R49 1 2 D12 SMCJ-28A OPT R40 1 1 1 1 1 1 OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT R60 R63 R65 R68 R70 R74 R94 R91 R89 R86 R82 R79 R77 R46 R44 R41 B R43 1 R58 R45 R48 R78 R81 R85 R88 R90 R93 R75 R71 R69 R66 R64 R61 R59 R56 OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT 1 1 1 1 1 1 1 1 1 1 ADC- SENSE- SENSE- TP8 ADC- TP7 OPT SENSE- ADC- (FROM TOP SIDE) R83 B OPT (TO BOTTOM SIDE) B C R95 C UNLESS OTHERWISE NOTED: 1. ALL RESISTORS THIS PAGE ARE 1% 0402. 2. ALL CAPACITORS THIS PAGE ARE 0603. 3. ALL 0.003 OHM SENSE RESISTORS ARE SIZE 2512. =HIGH CURRENT CONNECTIONS R42 OPT R47 OPT R80 OPT R87 OPT R92 OPT R72 0.0025 R67 0.0025 R62 0.0025 1 R54 R55 R51 1 R53 R57 0.0025 1 R52 0.0025 PRIMARY SIDE "RS2" R50 B Q1 Q2 Q7 1 GATE R39 R28 10 10 10 11 R27 E22 Q8 2 3 3 R73 10 R30 10 R29 10 5 1 Q9 BOB SMITH D DC2278A-A DC2278A-B SKU NO. LTC4281-UFD IC NO. APP ENG. DATE: PCA ASS'Y DWG: Tuesday, May 10, 2016 SCALE = NONE 705-DC2278A_REV02 E SHEET 2 OF 4 710-DC2278A_REV 02 SCHEMATIC NO. AND REVISION: HIGH CURRENT HOT SWAP CONTROLLER WITH I2C COMPATIBLE MONITORING AND EEPROM SIZE: N/A PSMN2R0-30YLE (OPT) SOURCE 1000 uF C1 OPT NICHICON P/N UVR1E102MPD OR EQUIVALENT + E 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: DEMO CIRCUIT SCHEMATIC, C12 0.022uF SECONDARY SIDE "Q2" APPROVALS 3 2 1 Q6 STV300NH02L (OPT) M.HAWKINS 4 1 R76 59k 50V C10 0.027uF PRIMARY SIDE "Q2" PCB DES. 10 9 8 7 6 5 4 3 2 N-CHANNEL UNIVERSAL (OPT) 3 2 GATE GATE N-CHANNEL UNIVERSAL 1 (OPT) 3 PSMN1R5-30BLE 4 PSMN1R5-30BLE 1 (OPT) 4 D 1 2 A 1 2 3 4 DEMO MANUAL DC2278A Schematic Diagram 15 dc2278af 1 2 3 4 A SOCKET POWER 0N 2 C5 0.1uF D4 RED R37 2k SCL SDA R34 R35 R36 SOCKET POWER R38 0 B OPT OPT R33 0 TIMER INTVCC ALERT SCL SDAO SDAI OV UV OPT 6 5 15 14 13 12 2 28 OPTIONAL PROGRAMMING SOCKET, C INSTALLED ON -B ASSEMBLY OPTION 1 ON 27 VDD +5V B R32 0 SKT1 SOCKET ADR2 11 26 ADC+ 25 SENSE+ 23 ADR1 R31 0 10 1 SENSE- 24 ADCADR0 9 C EXPOSED PAD FB CLKOUT CLKIN GPIO3 GPIO2 GPIO1 BOB SMITH APP ENG. DC2278A-A DC2278A-B SKU NO. LTC4281-UFD IC NO. M.HAWKINS PCB DES. APPROVALS 29 WP 4 22 GATE 21 SOURCE GND 3 GND 16 19 A UNLESS OTHERWISE NOTED: E DATE: PCA ASS'Y DWG: 705-DC2278A_REV02 D Tuesday, May 10, 2016 SCALE = NONE SIZE:8.5X11 E SHEET 3 OF 4 710-DC2278A_REV 02 SCHEMATIC NO. AND REVISION: HIGH CURRENT HOT SWAP CONTROLLER WITH I2C COMPATIBLE MONITORING AND EEPROM 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: DEMO CIRCUIT SCHEMATIC, 1. ALL RESISTORS THIS PAGE ARE 0603. 7 8 16 17 18 20 D 1 2 3 4 DEMO MANUAL DC2278A Schematic Diagram dc2278af 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 A A C WASHER, LOCK,INT. TOOTH,#4,SS WASHER, LOCK,INT. TOOTH,#4,SS WASHER, LOCK,INT. TOOTH,#4,SS MP14 MP15 MP16 B SCREW, MACHINE,#4-40 X 1/2,PHILLIPS PH,SS WASHER, LOCK,INT. TOOTH,#4,SS MP12 MP13 SCREW, MACHINE,#4-40 X 1/2,PHILLIPS PH,SS MP11 PCB, DC2278A REV02 PCB1 C LABEL LB1 BOB SMITH APP ENG. DC2278A-A DC2278A-B SKU NO. LTC4281-UFD IC NO. M.HAWKINS PCB DES. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: DEMO CIRCUIT SCHEMATIC, E DATE: PCA ASS'Y DWG: 705-DC2278A_REV02 D Tuesday, May 10, 2016 SCALE = NONE SIZE: 8.5X11 E SHEET 4 OF 4 710-DC2278A_REV 02 SCHEMATIC NO. AND REVISION: HIGH CURRENT HOT SWAP CONTROLLER WITH I2C COMPATIBLE MONITORING AND EEPROM NUT, HEX,1/4-20,SS 18-8 MP30 APPROVALS WASHER, LOCK,INT. TOOTH, 1/4 IN.,SS NUT, HEX,1/4-20,SS 18-8 MP28 MP29 WASHER, FLAT,SS 18-8,1/4 IN. WASHER, LOCK,INT. TOOTH, 1/4 IN.,SS MP27 WASHER, FLAT,SS 18-8,1/4 IN. MP26 MP25 WASHER,FLAT,#4,SS 18-8 MP8 SCREW, MACHINE,#4-40 X 1/2,PHILLIPS PH,SS MP23 MP24 WASHER,FLAT,#4,SS 18-8 MP7 SCREW, MACHINE,#4-40 X 1/2,PHILLIPS PH,SS WASHER, FLAT,SS 18-8,1/4 IN. WASHER, FLAT,SS 18-8,1/4 IN. MP22 WASHER,FLAT,#4,SS 18-8 MP6 MP9 SCREW, MACHINE,1/4-20 X 7/8,HEX WASHER HEAD, SS SCREW, MACHINE,1/4-20 X 7/8,HEX WASHER HEAD, SS MP21 MP10 NUT, HEX,#4-40,SS 18-8 MP20 WASHER,FLAT,#4,SS 18-8 MP5 BUMPER, RECESSED,#4 SCREW,BLACK MP4 NUT, HEX,#4-40,SS 18-8 NUT, HEX,#4-40,SS 18-8 NUT, HEX,#4-40,SS 18-8 MP18 MP17 D MP19 BUMPER, RECESSED,#4 SCREW,BLACK BUMPER, RECESSED,#4 SCREW,BLACK MP2 MP3 BUMPER, RECESSED,#4 SCREW,BLACK PCA ADDITIONAL PARTS MP1 B 1 2 3 4 DEMO MANUAL DC2278A Schematic Diagram dc2278af 17 DEMO MANUAL DC2278A 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 18 Linear Technology Corporation dc2278af LT 0916 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2015