DEMO MANUAL DC2428A LTC2975 4-Channel PMBus Power System Manager with LTM4644 Quad 4A Power Supply DESCRIPTION The DC2428A is a two-board demonstration system for the LTC®2975 Power System Manager and LTM4644 quad 4A µModule regulator. The DC2382A contains all the circuitry needed to use the LTC2975 in a power system and control four power supplies. The DC2363A contains four power supplies (LTM4644) that the LTC2975 configures and controls. The DC2363A and DC2382A demo boards together provide a sophisticated 4-channel digitally programmable power supply system. The LTC2975 is a 4-channel I2C/SMBus/PMBus power system manager that features accurate input current and energy measurement. The device monitors input current and input voltage, and calculates input power and energy. The DC2382A demonstrates the ability of the LTC2975 to sequence, trim, margin, supervise, monitor, and log faults for four power supplies. Each power supply channel’s output voltage and output current is monitored and the LTC2975 monitors its own internal die temperature. The DC2363A is a single circuit board that contains four independent power supply rails. The board employs a single LTM4644 4-channel 4A DC/DC regulator. The board comes pre-configured with 1V, 1.5V, 2.5V, and 3.3V supply rails and may be reconfigured with feedback resistors. The LTpowerPlay™ graphical user interface (GUI) supports this demonstration system and enables complete control of all the features of the LTC2975. Together, the LTpowerPlay software and DC2428A hardware system create a powerful development environment for designing and testing configuration settings of the LTC2975. LTpowerPlay stores these settings in the LTC2975’s internal EEPROM or in a project file. The software displays all of the configuration settings and real time measurements from the Power System Management IC. Telemetry allows easy access and decoding of the fault log created by the LTC2975. The board comes pre-programmed with the EEPROM values appropriate for the four power supply rails on the DC2428A. Just plug and play! The following items are required: •+12VDC Power Supply • USB-to-I2C/SMBus/PMBus Controller (DC1613) • LTpowerPlay Software DC2428A Features • Sequence, Trim, Margin, and Supervise Four Power Supplies • Manage Faults, Monitor Telemetry, and Create Fault Logs • PMBus Compliant Command Set • Supported by LTpowerPlay GUI • Margin or Trim Supplies to 0.25% Accuracy • Four IOUT and One IIN Monitor • Input Power Measurement and Energy Accumulation • Fast OV/UV Supervisors Per Channel • Multi-Channel Fault Management • Automatic Fault Logging to Internal EEPROM • Operates Autonomously without Additional Software • Monitors: Voltage, Current, Power, Temperature •4-Channel Time-Based Output Sequencer • I2C/SMBus Serial Interface • Powered from 4.5V to 14V Design files for this circuit board are available at http://www.linear.com/demo/DC2428A L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. dc2428af 1 DEMO MANUAL DC2428A PERFORMANCE SUMMARY PARAMETER Specifications are at TA = 25°C CONDITIONS MIN VPWR Supply Input Operating Range 4.5 VDD33 Supply Input Operating Range MAX UNITS 15 3.13 VIN ≥ 1V ADC Total Unadjusted Error TYP V 3.47 V ±0.25 ADC Voltage Sensing Input Range –0.1 ADC Current Sensing Input Range Differential Current Sense Voltage ADC Voltage Sensing Resolution 0V ≤ VIN_ADC ≤ 6V ADC Current Sense Resolution 0mV < |VIN_ADC| < 16mV 16mV < |VIN_ADC| < 32mV 32mV < |VIN_ADC| < 63.9mV 63.9mV < |VIN_ADC| < 127.9mV 127.9mV < |VIN_ADC| 6 –170 DAC Resolution % V 170 mV 122 µV/LSB 15.6 31.25 62.5 125 250 µV/LSB µV/LSB µV/LSB µV/LSB µV/LSB 10 DAC Full-Scale Output Voltage Buffer gain setting 0 Buffer gain setting 1 Temperature Sensor TUE Voltage Supervisor Input Voltage Range (Programmable) VSENSEP[n](Low Resolution) (High Resolution) Voltage Supervisor Sensing Resolution 0V to 3.8V range: 4.096/1024 0V to 6V range: 8.192/1024 Voltage Supervisor Total Unadjusted Error (TUE) 2V < VIN_VS < 6V, Low Resolution Mode 1.5V < VIN_VS < 3.8V, High Resolution Mode 0.8V < VIN_VS < 1.5V, High Resolution Mode bits 1.38 2.65 V V ±1 °C 0 0 6 3.8 4 8 I2C Serial Clock Frequency V V mV/LSB mV/LSB ±1.25 ±1.0 ±1.5 10 % % % 400 kHz Table 1. Demo Board System Specifications NOMINAL UNTRIMMED VOUT TOP EXT. FEEDBACK RESISTOR (k) BOTTOM FEEDBACK RESISTOR (k) RDAC (k) MARGIN RANGE (%) CH0 1.0V ±1.5% 6.04 8.25 20.5 ±15 CH1 1.5V ±1.5% 6.04 3.65 14.3 ±15 CH2 2.5V ±1.5% 6.04 1.74 8.25 ±15 CH3 3.3V ±1.5% 6.04 1.21 6.81 ±15 Notes: • Load current <4A is recommended. • Output voltages can be margined by ±15% from nominal with the default resistor values on the DC2363A. These values can be easily changed. See section Changing Nominal Output Voltages. Use the LTC2975 Resistor Selection Tool which is accessed from LTpowerPlay. dc2428af 2 DEMO MANUAL DC2428A GLOSSARY OF TERMS The following list contain terms used throughout the document. Trim: The act of adjusting the final output voltage. A servo loop is typically used to trim the voltage. Channel: The collection of functions that monitor, supervise, and trim a given power supply rail. UV: Undervoltage, the result of a voltage comparison that a pin voltage is below a programmable threshold voltage. EEPROM: Non-volatile memory (NVM) storage used to retain data after power is removed. What this Demo System Can Do Margin: Term used typically in board level testing that increases/decreases the output voltage to look for sensitivity/marginality problems. Monitor: The act of measuring voltage, current, and temperature readings. • Prototype your system. You can change the nominal output voltages to match your system. You can also change the range and resolution of margining. Set sequencing. Set OV/UV limits. Set OC limits. NVM: Non-volatile memory, see EEPROM. • Create your own configuration that you can store in the EEPROM of the LTC2975 or save to a file. This file can be used to order pre-programmed parts. OV: Overvoltage, the result of a voltage comparison that a pin voltage is above a programmable threshold voltage. • Test most conceivable fault scenarios. All outputs can be shorted. PMBus: An industry standard power-management protocol with a fully defined command language that facilitates communication with power converters and other devices in a power system. Demo System Hardware Hardware required: 1. PC + USB cable Rail: The final output voltage that the LTC2975 supervises. 2.12V, >1A power supply Supervise: The act of quickly responding (compared to a fault setting) to a voltage and current condition that is compared to pre-programmed values. 3. USB to I2C/SMBus/PMBus Controller 4. DC2428A = DC2363A + DC2382A Figure 1. Single LTC2975 Demo Setup Using DC2428A dc2428af 3 DEMO MANUAL DC2428A LTpowerPlay GUI SOFTWARE LTpowerPlay is a powerful Windows-based development environment that supports Linear Technology Power System Management ICs with EEPROM, including the LTC2975 4-Channel Power System Manager. 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 features an offline mode to build a multi-chip configuration file for later use with hardware. LTpowerPlay provides unprecedented system level 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 DC1613 I2C/SMBus/PMBus Controller to communicate with one of many potential targets, including the DC2428A 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. Download the software from: http://www.linear.com/ltpowerplay Select Help, View Online Help from the LTpowerPlay menu to access technical documents. Figure 2. Screenshot of the LTpowerPlay GUI dc2428af 4 DEMO MANUAL DC2428A QUICK START PROCEDURE The following procedure describes how to set up a DC2428A demo system. 1. Download and install the LTpowerPlay GUI: www.linear.com/ltpowerplay 2. Remove the board from the ESD protective bag and place it on a level surface. Connect the DC1613 I2C/ SMBus/PMBus Controller to the DC2382A board using the 12-pin ribbon cable. 3. Confirm that all jumpers and switches are set as follows: b. On the DC2382A board, set ASEL jumpers to LOW, CONTROL jumpers to SW0-SW3, and WRITE-PROTECT jumper to OFF. c. On DC2363A board, set PRE-LOAD jumpers to ON, and TRACK jumpers to SS. 4. Plug the USB-to-I2C/SMBus/PMBus Controller into a USB port on your PC. The board should power up with the LED labeled LTC2975 ON illuminated green. 5. Connect a +12VDC power supply with > 1A capacity a. The CONTROL switches are set to the HI position. Figure 3. Connecting DC2363A/DC2382A Boards and the DC1613 USB to I2C/SMBus/PMBus Controller dc2428af 5 DEMO MANUAL DC2428A QUICK START PROCEDURE to the VIN input jack of the DC2363A board. The four outputs will power up and the green LEDs will illuminate. The PWR GOOD LED (D6) on the DC2382A board will illuminate. 6. Launch the LTpowerPlay GUI. a. The GUI automatically identifies the DC2382A and builds a system tree for each I2C device. The system tree on the left hand side will look like this: If you need to load the original board default configuration, select the GUI menu pulldown item DEMO > DC2382A_Defaults. This writes the board defaults into the LTC2975’s RAM and automatically to NVM as well. 7. The CONTROL switches are configured to control the channels individually. Slide the switch to HI to enable, GND to disable each channel. To demonstrate channel sequencing, one CONTROL switch may be used to turn all channels on/off. Configuration changes to the LTC2975 are needed. This is covered later in the document. Loading a Configuration (*.proj) File with the GUI To load a previously saved proj file: b. A green message box will be displayed momentarily in the lower left hand corner confirming that the DC2382A is communicating. 1. In the upper left hand corner of the GUI, File > Open > browse to your *.proj file. This will load the file into the GUI. 2. Click on the GO ONLINE icon, then click on the PC RAM icon to write all registers. c. You may make configuration changes. When you update registers in the GUI by using either function key F12 to write an individual register or use the Write All icon to write all registers, you may need these settings for future use. Save the demo board configuration to a (*.proj) file by clicking the Save icon. This creates a backup file on your C: drive. Name it whatever you like. This loads the configuration into the working RAM of the LTC2975. 3. To store the configuration to NVM (EEPROM), click on the RAM NVM icon. dc2428af 6 DEMO MANUAL DC2428A DC2428A - DETAILS (DC2363A + DC2382A) Figure 4. DC2428A Details dc2428af 7 DEMO MANUAL DC2428A COMMON BOARD OPERATIONS Overview DC2382A LEDs The two boards are represented below in a simplified block diagram. The LTC2975 measures input current with a 10 milliohm sense resistor. It also controls, monitors, and supervises all four LTM4644 outputs through the 50-pin connector. The LTC2975 ON LED (D1) illuminates when the LTC2975 is powered from the USB controller or the DC2363A external power. The green LED (D6) is the LTC2975 PWRGD signal. The red LEDs on ALERTB, FAULTB0, FAULTB1 and AUXFAULTB (D3 ,D4, D5, D2) indicate a fault or warning has occurred. Powering the Boards The DC2363A board is powered from a wall-powered 12V supply. The supply must be capable of delivering > 1A. If the four channels are loaded with 1A each, the input current will be nearly 1A. The DC2382A board is powered either from the DC1613’s 3.3V power or the DC2363A if VIN is applied. DC2363A LEDs Each individual channel on DC2363A has its own green LED which indicates that the channel is enabled. Figure 5. Simplified Block Diagram of the DC2428A dc2428af 8 DEMO MANUAL DC2428A COMMON BOARD OPERATIONS Reset the LTC2975 To reset the LTC2975 and reload the EEPROM contents into operating memory (RAM), press SW4 on the DC2382A. Pre-Load the Outputs Each of the outputs on the DC2363A board has a jumper to pre-load the output. When enabled, the load current is pre-defined to be 100mA. This ensures an unloaded output voltage decays to GND quickly when the channel is disabled. This is useful when sequencing off then on quickly. applied to each of the channels relative to the CONTROL0 pin. The same applies to TOFF_DELAY values. When the CONTROL switch is set to the OFF position, all rails will power down sequentially based device’s TOFF_DELAY values. Figure 6 shows an oscilloscope screen capture of three output rails sequencing up and down in response to the CONTROL pin. Controlling/Sequencing Channels By default the DC2382A board comes with each of the four CTRL switches configured to enable its respective channel. Figure 6. Sequencing Output Channels On/Off Each channel has an LED which visually indicates if the channel has power. When the CONTROL pin is switched on and off, you will observe the relative on/off timing of the four channels. To demonstrate time-based sequencing, let’s use the CTRL0 switch as the master enable. Select CONTROL0 for each channel as shown. Click the All Paged button and expand the MFR_CONFIG register. Change the controln_sel bit for each channel using in the GUI’s system tree. Figure 7. TON_DELAY and TOFF_DELAY Settings The LTC2975 are pre-configured with different TON_DELAY values for each channel. The TON_DELAY parameter is For the LTC2975, the TON_DELAY and TOFF_DELAY values extend to 655ms, providing a reasonable range for sequencing on and off of power supply rails. dc2428af 9 DEMO MANUAL DC2428A COMMON BOARD OPERATIONS Margin All Rails The LTC2975 power system manager on the DC2382A not only monitors each of the four outputs but can margin the outputs either high or low. Margining is the operation that moves a rail up or down for testing purposes. It allows a system to be fully characterized over supply limits without the use of external hardware or resources. The GUI provides an easy way to margin all rails high or all low by clicking one of four buttons. To invoke the margining dialog, click the GroupOp icon in the toolbar. The buttons labeled ignore faults will margin without creating a fault even if the fault limits are exceeded. A look at the telemetry window shows the effect of the margin high or margin low operation. The following screen shot shows all rails going from nominal setpoints to margin high, margin low, and back to nominal voltages. The LTC2975 has a multiplexed ADC that is used to provide voltage, current, and temperature readback values. The telemetry plot in the GUI is similar to a multi-channel oscilloscope which is capable of displaying any parameter that is displayed in the telemetry window. Due to the nature of a multiplexed ADC converter, it has an associated ADC loop time of approximately 150ms. Creating a Fault Any one of the channels on the DC2363A board may be faulted to demonstrate the demo board’s ability to detect it and respond according to the configuration. An output may be shorted to ground with a jumper wire or coin applied to the output and GND turrets. When faulted, all channels power down immediately and the GUI’s system tree indicates the color red for the Status portion of that channel. In this example, GUI channel U0:1, the 1.5V output. You should see all outputs power off, the fault LED momentarily illuminate, the alert LED illuminate continuously, and all rails sequence back on after a retry period. You may also short any power supply output indefinitely. This is a good way to induce UV faults and shows that a shorted channel will not be damaged. Clearing a Fault To clear a fault, you can click the CF icon in the GUI or simply push the RESET pushbutton (SW4) on the DC2382A demo board. In both cases, the red (+) on the CF icon and alert LED on the board are both cleared. Notice that all rails are automatically re-enabled after a programmable dc2428af 10 DEMO MANUAL DC2428A COMMON BOARD OPERATIONS retry period. A dialog box may pop up after clicking the Clear Faults (CF) icon. If a fault log is present, a dialog will ask if you would like to clear the fault log as well as clear system faults. After clearing faults, the system tree will return to green and fault logs re-armed. For further information, see the Working with the Fault Log section. Why am I Off? Tool Use the Why am I Off tool in the LTpowerPlay GUI to diagnose the cause for a power supply channel being in an off state. The tool is located in the top right corner of the GUI, above the Register Information tab. Hover your cursor over the tab to show the tool. First select an output channel in the system tree. The tool collects various status information and provides a diagnosis. Figure 8. Why am I Off Tool in the LTpowerPlay GUI ADVANCED DEMO BOARD OPERATIONS What Is a Fault Log? Create a Fault Log A fault log is a non-volatile record of the power system leading up to the time of fault. Telemetry data is continuously updated in a circular RAM buffer in the LTC2975. When a fault occurs, the contents of the RAM buffer are automatically written to NVM. The most recent monitored values (uptime, voltage, current, temperature) provide additional context preceding the fault. It is a powerful diagnostic feature of the LTC2975 on the DC2382A demo board. To create a fault log, check that the fault_log_enable bit is set in the MFR_CONFIG_ALL register. Then, create a fault, as described in the section Creating A Fault. If multiple boards are configured, select the appropriate device in the system tree by clicking on the appropriate LTC2975 chip. We are ready to work with the fault log. dc2428af 11 DEMO MANUAL DC2428A ADVANCED DEMO BOARD OPERATIONS Working with the Fault Log Once a fault has occurred, the Fault Log (FL) icon will show a red (+) sign on it, indicating that the GUI has detected a fault log in the device. Clicking the icon will bring up a dialog box. contains data obtained in one ADC loop time with the most recent ADC loop data on top and the oldest data at the bottom of the log. The up-time indicates, at the time of fault, the amount of time the device had been powered up or time since the previous reset. Note that it is a context sensitive icon. If multiple DC2382A boards are connected, be sure that the desired device is selected in the system tree. Once a fault occurs, the device will automatically write the fault log data to EEPROM (NVM). At this point, the log is locked and will not change until it is cleared by the user. It is a 2-step process to read the fault log. First click the NVM to RAM button. At this point the RAM Log is locked. Click the Read NVM Log button. The log data will appear in the text box below. In this case, the fault log will show that channel U0:1 faulted due to a VOUT_UV_FAULT condition. On the previous telemetry loop, the channel voltage reading was a nominal value (3.3V). You can save the fault log to a file (.rtf) by clicking the Export button. To clear the fault log, click the Clear/Rearm EEPROM Log button. This allows the selected device to be ready for a new fault event. To clear all faults, click the Clear Faults (CF) icon. Fault Sharing Setup in the GUI Fault sharing provides a means of propagating a fault detected by a power manager to other power managers via FAULT pins. Use the Fault Sharing Setup Tool to configure the fault sharing in the GUI. Select the LTC2975 in the system tree. Go to Utilities > Fault Sharing Diagram. (For more details on this topic, please refer to the Fault Management section in the data sheet.) The fault sharing dialog will appear as shown in Figure 9. All Response and all Propagate switches are closed by default. In this configuration, a fault on a channel will shut down not only the faulted channel but all other channels since the Propagate switches are closed. The log contains timestamp, up-time, channel voltage readings, an input voltage reading, an on-chip temperature reading, etc. There will be a number of loops; each loop 12 There are two types of actions to fault conditions: How a channel responds to another channel’s fault and whether a particular channel propagates its fault to other channels. FAULT pins are bi-directional, meaning the device may drive its fault pin low (output) or may respond to the fault pin when another device drives it low (input). Because the two fault pins are separated on the DC2382A, this allows you dc2428af DEMO MANUAL DC2428A ADVANCED DEMO BOARD OPERATIONS Figure 9. Fault Sharing Utility in LTpowerPlay GUI Figure 10. Updated Fault Sharing Configuration to configure the fault settings on a channel-by-channel basis. By default, the LTC2975 is configured to shut down its channels if the FAULT pin is low and to propagate its own fault by driving the FAULT pin low. You can think of the Response switches as shut this channel down when another channel faults, and the Propagate switches as drive the fault pin to broadcast to other channels that this channel faulted. (CH0) will power back up. We can now observe the effect of changing the response setting on U0:1 (CH1). If you short U0:3 (CH3 3.3V rail) to ground, notice that all rails shut down except U0:1 (CH1). This is an example of a keep-alive channel that remains powered up independent of faults to other channels. Fault Configuration Example Let’s explore two different examples. Suppose we do not want channel U0:0 (CH0 1.0V rail) to propagate its fault to the other channels when it faults. And suppose we do not want channel U0:1 (CH1 1.5V rail) to shut down in response to another channel’s fault. We can configure the switches as shown in Figure 10. Simply click the switches to open/close. Click OK to close the dialog box. The LTC2975 is capable of high-side current sensing of the input power supply. This feature allows the manager to measure input supply current. Select the READ_IIN register to display the telemetry plot. The input current reading will be ~160mA if all channels are enabled, preloaded, and VIN = 12V. Notice the current reading move lower as you turn channels off. Click the PC RAM icon to write the changes to the DC2382A. We can now create a fault on U0:0 (CH0) by shorting the output to ground. You may use a coin or a jumper to temporarily connect CH0 to the GND turret. You will notice that the channel shuts off but the other channels remain powered up because its fault is not propagated to the other channels. After the retry period, channel U0:0 The manager also measures input supply voltage and is therefore able to report input power as well. Since energy dc2428af 13 DEMO MANUAL DC2428A ADVANCED DEMO BOARD OPERATIONS is the product of power and time, accumulated energy is provided based on the manager’s internal timebase. The meter displayed in the upper right hand corner of the GUI provides a number of bits of information. The needle is a real-time indicator of input power and the smaller five dials show the total accumulated energy similar to a home electricity meter. Digital readouts are also provided for convenience. first select the MFR_EIN register to display the energy in the telemetry plot. Turn off channels 2 and 3 by setting those CTRL switches off. You will notice that the slope has changed. The accumulated energy rate is the slope. Energy is still being accumulating but at a lower rate since channels 0 and 1 remain enabled. Note that the input current has changed from about 160mA down to 48mA as seen in the READ_IIN register. The MFR_EIN_WATTS register displays the input power that is being drawn. This register is the product of the READ_VIN and READ_IIN values. Since the input voltage is 12V, the input power is 12V • 160mA or 1.92W. You can confirm this by clicking these three registers one by one and view the telemetry window. The DC2363A demo board has power supplies that are capable of high current. The LTC2975 is able to monitor and measure four outputs and its input power supply. LTpowerPlay offers a simple and easy to understand interface that brings together input and output current, voltage, power, and energy readings. The MFR_EIN and MFR_EIN_TIME registers may be reset by right-clicking the MFR_EIN register which displays an option menu to Clear HW Register. It may also be reset by writing the MFR_EIN_CONFIG register. Changing Nominal Output Voltages You may also view the input current, input voltage, input power, and input energy together in tabular format. These appear in the telemetry portion of the GUI. The MFR_EIN register holds the accumulated energy value in milliJoules. There is also a total time that the energy accumulator has been active and is shown as the MFR_EIN_TIME register. The GUI will automatically update the displayed SI prefix as the units change from mJ to J to kJ. To demonstrate the meter readings and register values, The nominal output voltage of any channel on the DC2363A can be adjusted by changing feedback resistors. There are two external resistors that set the floating voltage, a topside feedback resistor (RTOP) and a bottom feedback resistor (RBOT). Note that these feedback resistors provide compensation for the IR drop of the sense resistor in the output path. The equation that relates feedback resistors and VOUT is as follows: VOUT = ((60.4k||RTOP)/RBOT + 1) • 0.6V dc2428af 14 DEMO MANUAL DC2428A ADVANCED DEMO BOARD OPERATIONS LTM4644 L ERROR AMP RSENSE L1 RFB 60.4k C1 47µF FB VREF = 0.6V ISENSE VOUT 1.0V RTOP 6.04k RLOAD RBOT 8.25k dc2428a F11 Figure 11. Output Voltage Set by Feedback Resistors Use the LTpowerPlay’s Resistor Selection Tool to calculate resistor values and to display the proper DAC range settings. The Resistor Selection Tool refers to R10, R20, and R30. R10 is the bottom feedback resistor, R20 is the top feedback resistor, and R30 is the DAC resistor. The tool’s R20 value that is entered is the parallel combination of the internal and external topside resistors. The resistor RFB is 60.4k which is inside the LTM4644 µModule. There is an external sense resistor in the output path for the purpose of measuring current. An external topside feedback resistor RTOP is wired from the output turret to the FB node. All four channels use a 6.04k RTOP feedback resistor. These are: R78-R80. The parallel combination (60.4k||6.04k) is 5.49k. The bottom feedback resistors (RBOT) for each channel are R10-R13. The output trim resolution and range can be adjusted for any output on the DC2363A by simply changing the RDAC resistor value. The DAC resistors (R30) are R18-R21. Table 2 on shows a summary of the feedback resistor values and DAC resistor values. Figure 12. LTpowerPlay’s Resistor Selection Tool dc2428af 15 DEMO MANUAL DC2428A ADVANCED DEMO BOARD OPERATIONS Tracking Outputs The DC2363A board offers output tracking capability which allows the startup ramp of all channels to track together. The LTC2975 supports tracking power supplies that have a tracking pin and are configured for tracking. A tracking power supply uses a secondary feedback terminal (TRACK) to allow its output voltage to be scaled to an external master voltage. Typically, the external voltage is generated by the supply with the highest voltage in the system, which is fed to the slave track pins. Any supply that tracks a master supply must be enabled before the master supply comes up and disabled after the master supply comes down, so that they will properly track the master and not produce unwanted faults. Refer to the LTC2975 data sheet for further description of timing rules, fault behavior, and register configuration settings. CTRL3 LTC2975 LTM4644 VOUT_EN3 VDAC3 RUN VFB TRACK VOUT3 RUN VFB TRACK VOUT2 3.3V LOAD CSS VOUT_EN2 VDAC2 60.4k LOAD 19.1k VOUT_EN1 VDAC1 60.4k RUN VFB TRACK VOUT1 40.2k VOUT_EN0 VDAC0 RUN VFB TRACK 90.9k 1.5V LOAD VOUT0 60.4k 2.5V 1V LOAD dc2428a F13 Figure 13. LTC2975 Configured for Power Supply Tracking DC2382A’s CTRL3 switch acts as the master enable, in addition to commanding CH3’s OPERATION register. To demonstrate tracking: 1. Set all three TRACK jumpers to the TRK position, and set CH3’s pre-load jumper to ON. 2. On the DC2382A board, ensure that jumper JP7 is set to SW3. The DC2363A and DC2382A boards are configured to demonstrate tracking as described below. CH3 (3.3V) is the master channel and CH0-2 are slave channels. The 3. In LTpowerPlay, select Demo>DC2382A_tracking from the GUI’s menu. The following register screen shots document the relevant configuration settings. dc2428af 16 DEMO MANUAL DC2428A ADVANCED DEMO BOARD OPERATIONS Cascaded Sequencing The DC2363A/DC2382A board set also offers cascaded sequencing capability. Cascade sequencing allows a master power supply to sequence ON a series of slave supplies by connecting each power supply’s power good output to the control pin of the next power supply in the chain. Note that the power good signal is that of the power supply and not derived from the LTC2975’s internal power good processing. Power good based cascade sequence OFF is not supported. OFF sequencing must be managed using immediate-off or time-based sequencing. A cascade sequence wiring diagram is shown in Figure 14. For each slave channel, the mfr_config_cascade_on bit is set (high) and the associated control input connects to the power good output of the previous power supply. In this configuration each slave channel’s startup is dependent on the previous supply being powered up. CONTROL0 LTC2975 FAULT90 FAULT90 CONTROL0 RECOMMENDED CONNECTION WHEN HARDWARE ON/OFF CONTROL IS REQUIRED VOUT_EN0 VOUTP RUN DC/DC CONTROL1 VOUT_EN1 POWERGOOD0 VOUTM VOUTP RUN DC/DC CONTROL2 VOUT_EN2 VOUTP DC/DC CONTROL3 VOUT_EN3 VOUTP DC/DC TO NEXT CONTROL PIN VSENSP1 VSENSM1 VSENSP2 LOAD POWERGOOD2 VOUTM RUN MASTER VSENSM0 LOAD POWERGOOD1 VOUTM RUN VSENSP0 LOAD SLAVES VSENSM2 VSENSP3 LOAD POWERGOOD3 VOUTM VSENSM3 dc2428a F14 Figure 14. LTC2975 Configured for Cascaded Sequencing The channels cascade on/off via the CTRL0 switch on the DC2382A board, or command CH0’s OPERATION register on/off. The LTC2975 configuration is such that the controln_sel bit is set to its respective channel. The cascade_on bit is set for the three slave channels (CH1-3) and cleared on the master channel (CH0). To demonstrate cascade sequencing: 1. Set the three TRACK jumpers to SS on the DC2363A board. 2. Set JP5-JP7 to the PG setting on the DC2382A board. 3. In LTpowerPlay, select Demo>DC2382A_cascade_seq from the GUI’s menu. dc2428af 17 DEMO MANUAL DC2428A SETUP PROCEDURE FOR MULTI-BOARD ARRAYS Multiple DC2428As can be combined to control as many nine board pairs. 4. Plug the ribbon cable of the DC1613 into one of the DC2382As. 1. Connect DC2363A/DC2382A to pair them. 5. Connect a power supply to each of the DC2363A boards. Power is not distributed to other board pairs via the J1/J3 cascading connector. 2. Plug DC2382A’s together. 3. Set a unique address for each DC2382A in the array using ASEL0 and ASEL1 (JP1, JP2). See the following section for further details. Figure 15. Array of Multiple Board Sets dc2428af 18 DEMO MANUAL DC2428A SETUP PROCEDURE FOR MULTI-BOARD ARRAYS Selecting a Device Address The DC2382A jumpers (JP1, JP2) are labeled ASEL0 and ASEL1 which allow the user to select one of nine I2C addresses. The I2C/SMBus address of the LTC2975 equals the base address + N where N is a number from 0 to 8. N is configured by setting the ASEL0 and ASEL1 pins to VDD33, GND or FLOAT. See Table 3 below. Using one base address and the nine different values of N, nine LTC2975s can co-exist on the same I2C bus to control 36 outputs. The base address is stored in the MFR_I2C_BASE_ADDRESS register. The base address can be written to any value, but generally should not be changed unless the desired range of addresses overlap existing addresses. Be careful that the address range does not overlap with other I2C/ SMBus device or global addresses, including I2C/SMBus multiplexers and bus buffers. NOTE: Regardless of the jumper setting, the part will always respond to the I2C global 7-bit address 0x5B. Table 3. Address Selection of LTC2975 I2C ADDRESS (7-BIT) ASEL1 POSITION ASEL0 POSITION DEFAULT 0x5C L L ✓ 0x5D L Z 0x5E L H 0x5F Z L 0x60 Z Z 0x61 Z H 0x62 H L 0x63 H Z 0x64 H H dc2428af 19 DEMO MANUAL DC2428A PCB LAYOUT DC2382A Top Layer DC2382A Bottom Layer Table 4. Default Jumper and Switch Configuration REFERENCE DESIGNATOR SIGNAL NAME USAGE DEFAULT JP1, JP2 ASEL0, ASEL1 Set the address offset of LTC2975. Low, Low JP3 WRITE PROTECT Write protect the LTC2975 EEPROM. Off JP4, JP5, JP6, JP7 CONTROL0, CONTROL1, CONTROL2, CONTROL3 Jumpers that connect LTC2975 CONTROL pins to CTRL SW0, SW1, SW2, SW3 switches or to PG signals from DC2363A board. Implement cascade sequencing by connecting power good signals to the control pins, or connect CONTROL pins directly to the CTRL switches. SW0,SW1,SW2,SW3 CTRL0, CTRL1, CTRL2, CTRL3 Switches used to enable channels. Switch behavior is dependent on jumper settings JP4-JP7. HI, HI, HI, HI dc2428af 20 DEMO MANUAL DC2428A PCB LAYOUT DC2363A Top Layer Table 5. Default Jumper Settings REFERENCE DESIGNATOR SIGNAL NAME USAGE DEFAULT JP1-JP4 VOUT_CH0, VOUT_CH1, VOUT_CH2, VOUT_CH3 Enable/Disable 100mA pre-load on CH0-CH3 outputs. All On JP5-JP7 TRACK0, TRACK1, TRACK2 Select Soft-Start (SS) or Tracking feature of Slave Channels All SS (CH0-CH2). dc2428af 21 DEMO MANUAL DC2428A PCB LAYOUT DC2363A Bottom Layer dc2428af 22 DEMO MANUAL DC2428A DC2382A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER IC 4-CH POWER SYSTEM MANAGER 64QFN LINEAR TECH: LTC2975IUP#PBF Required Circuit Components 1 1 U1 Additional Demo Board Circuit Components 2 9 C1, C2, C3, C4, C6, C8, C9, C12, C15 CAP CERAMIC 0.1µF 16V X7R 0402 AVX: 0402YC104KAT2A 3 6 C5, C10, C11, C13, C14, C20 CAP 0.01µF 25V CERAMIC X7R 0402 AVX: 04023C103KAT2A 4 1 C7 CAP CER 0.1µF 25V X5R 0402 AVX: 04023D104KAT2A 5 8 C23, C24, C25, C26, C28, C29, C30, C31 CAP 2.2nF 16V CERAMIC X7R 0402 AVX: 04023C222KAT2A 6 2 D1, D6 LED GREEN HI-BRT SMD 0603 PANASONIC: LNJ326W83RA 7 4 D2, D3, D4, D5 LED RED SMD 0603 PANASONIC: LNJ237W82RA 8 1 Q1 MOSFET P-CH 20V 200MΩ SOT323-3 ON SEMI: NTS4173PT1G 9 1 Q2 MOSFET N-CH 60V 115MA SOT-23 FAIRCHILD: 2N7002 10 15 R1, R3, R4, R6-R15, R32, R34 RES 10.0k 1/10W 1% 0402 SMD VISHAY: CRCW040210K0FKED 11 5 R2, R18, R23, R31, R36 RES 100Ω 1/10W 1% 0402 SMD VISHAY: CRCW0402100RFKED 12 1 R5 RES 5.49k 1/10W 1% 0402 SMD VISHAY: CRCW04025K49FKED 13 1 R16 RES 150k 1/10W 1% 0402 SMD VISHAY: CRCW0402150KFKED 14 1 R17 RES 49.9k 1/10W 1% 0402 SMD VISHAY: CRCW040249K9FKED 15 4 R19, R20, R27, R35 RES 100k 1/10W 1% 0402 SMD VISHAY: CRCW0402100KFKED 16 7 R21, R24, R25, R26, R28, R30, R33 (OPT) RES 0.0Ω 1/10W 0402 SMD DO NOT INSTALL! 17 2 R22, R29 RES 0.0Ω 1/10W 0402 SMD VISHAY: CRCW04020000Z0ED 18 6 R37, R38, R39, R40, R41, R42 RES 1.4k 1/10W 5% 0402 SMD VISHAY: CRCW04021K40JNED 19 1 U2 IC EEPROM 2KBIT 400Khz 8TSSOP MICROCHIP: 24LC025-I/ST 20 2 U4, U5 IC BUFF/DVR DL NON-INV SC70-6 TEXAS INSTR: SN74LVC2G07DCKR MILL MAX 803-43-020-20-001000 Hardware: For Demo Board Only 21 1 J1 CONN SOCKET 20POS DUAL ROW 22 1 J2 CONN HEADER 12POS 2MM STR DL PCB FCI: 98414-G06-12ULF 23 1 J3 CONN PIN HEADER 20POS DUAL ROW MILL MAX 802-40-020-20-001000 24 1 J4 CONN FEMALE 50POS DL 0.1" R/A GOLD SULLINS: PPPC252LJBN-RC 25 2 JP1, JP2 CONN HEADER 4POS 2MM VERT T/H WURTH: 620 004 111 21 26 5 JP3-JP7 CONN HEADER 3POS 2MM VERT T/H WURTH: 620 003 111 21 27 4 MH1-MH4 SPACER STACKING #4 SCREW NYLON KEYSTONE: 8831 28 4 SW0-SW3 SW SLIDE DPDT 6VDC 0.3A PCMNT C&K: JS202011CQN 29 1 SW4 PUSHBUTTON SWITCH 3.5x6 100GF SMD PANASONIC: EVQ-PJS04K 30 7 SH1-SH7 CONN SHUNT 2MM 2POS BLACK WURTH: 608 002 134 21 31 15 TP1-TP15 TERM SOLDER TURRET 0.156"H 0.084"L MILL MAX: 2308-2-00-80-00-00-07-0 dc2428af 23 DEMO MANUAL DC2428A DC2363A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER QUAD 4A BUCK REGULATOR µMODULE BGA77 LINEAR: LTM4644EY#PBF CAP ALUM POLY 220µF 20V 20% 3.5X8 NICHICON: PLV1D221MDL1TD Required Circuit Components 1 1 U1 Additional Demo Board Circuit Components 2 1 C1 3 4 C2, C3, C47, C48 CAP CER 22µF 25V 10% X5R 1210 MURATA: GRM32ER61E226KE15L 4 17 C4, C5, C6, C7, C21, C22, C23, C24, C37, C38, C39, C40, C41, C42, C43, C44, C45 CAP CER 10nF 50V 10% X7R 0603 MURATA: GRM188R71E103KA01D 5 4 C8, C9, C10, C11 (OPT.) CAP CER 0603 (OPTIONAL) - 6 4 C12, C13, C14, C15 CAP CER 47µF 10V 20% X5R 1206 MURATA: GRM31CR61A476ME15L 7 4 C16, C17, C18, C19 CAP CER 22µF 10V 10% X7R 1210 TDK: C3225X7R1A226K230AC 8 1 C20 CAP CER 100nF 16V 10% X7R 0603 MURATA: GRM188R71C104KA01D 9 8 C25-C32 (OPT.) CAP CER 2.2nF 50V 10% C0G 0603 (OPTIONAL) MURATA: GRM1885C1H222JA01D 10 4 C33-C36 CAP TANT POLY 330µF 6.3V 20% 2917 (7343) PANASONIC: 6TPF330M9L 11 1 C46 CAP CER 1µF 10V 10% X7R 0603 TAIYO YUDEN: EMK107B7105KA-T 12 2 C49, C50 CAP CER 22µF 25V 10% X5R 1206 MURATA: GRM31CR61E226KE15L 13 4 LED0, LED1, LED2, LED3 LED GREEN SS TYPE BRIGHT SMD PANASONIC: LNJ326W83RA 14 1 M1 MOSFET DUAL N-CH 60V SOIC8 VISHAY: SI4946BEY-T1-GE3 15 4 M2, M3, M4, M5 MOSFET N-CH 30V 900MA SOT323-3 DIODES INC: DMG1012UW-7 16 1 Q1 TRANS GP NPN 40V ON SEMI: MMBT3904WT1G 17 1 R1 RES CURRENT SENSE 0.01 1W 2512 SMD VISHAY: WSK2512R0100FEA 18 1 R2 RES 2.1M 0.1W 1% 0603 SMD VISHAY: CRCW06032M10FKEA 19 1 R3 RES 221k 0.1W 1% 0603 SMD VISHAY: CRCW0603221KFKEA 20 1 R4 RES 80.6k 0.1W 1% 0603 SMD VISHAY: CRCW060380K6FKEA 21 1 R5 RES 100k 0.1W 1% 0603 SMD VISHAY: CRCW0603100KFKEA 22 4 R6, R7, R8, R9 RES 49.9k 0.1W 1% 0603 SMD VISHAY: CRCW060349K9FKEA 23 1 R10 RES 1.21k 0.1W 1% 0603 SMD VISHAY: CRCW06031K21FKEA 24 1 R11 RES 1.74k 0.1W 1% 0603 SMD VISHAY: CRCW06031K74FKEA 25 1 R12 RES 3.65k 0.1W 1% 0603 SMD VISHAY: CRCW06033K65FKEA 26 2 R13, R19 RES 8.25k 0.1W 1% 0603 SMD VISHAY: CRCW06038K25FKEA 27 4 R14, R15, R16, R17 RES CURRENT SENSE 0.01 0.5W 1210 SMD YAGEO: RL1210FR-070R01L 28 1 R18 RES 6.81k 0.1W 1% 0603 SMD VISHAY: CRCW06036K81FKEA 29 1 R20 RES 14.3k 0.1W 1% 0603 SMD VISHAY: CRCW060314K3FKEA 30 1 R21 RES 20.5k 0.1W 1% 0603 SMD VISHAY: CRCW060320K5FKEA 31 4 R22-R25 RES 2.0k 0.1W 1% 0603 SMD VISHAY: CRCW06032K00JNEA 32 1 R26 100k RESISTOR ARRAY, 4 RES, 1206 VISHAY: CRA06S083100KJTA 33 4 R27-R30 1k RESISTOR ARRAY, 2 RES, 0606 PANASONIC: EXB-V4V102JV 34 8 R31-R38 RES 100Ω 0.1W 1% 0603 SMD VISHAY: CRCW0603100RFKEA 35 1 R39 RES 33Ω 0.5W 1% 1210 SMD VISHAY: CRCW121033R0JNEA 36 1 R40 RES 24.9Ω 0.5W 1% 1210 SMD VISHAY: CRCW121024R9FKEA 37 1 R41 RES 15Ω 0.5W 1% 1210 SMD VISHAY: CRCW121015R0FKEA 38 1 R42 RES 10Ω 0.5W 1% 1210 SMD VISHAY: CRCW121010R0JNEA 39 4 R43-R46 RES 0Ω 0.1W 0603 SMD VISHAY: CRCW06030000Z0EA dc2428af 24 DEMO MANUAL DC2428A DC2363A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 40 10 R50, R52, R68-R71, R73-R76 (OPT) RESISTOR (OPTIONAL) VISHAY: CRCW06030000Z0EA 41 3 R53, R55, R57 RES 60.4k 0.1W 1% 0603 SMD VISHAY: CRCW060360K4FKEA 42 1 R54 RES 19.1k 0.1W 1% 0603 SMD VISHAY: CRCW060319K1FKEA 43 1 R56 RES 40.2k 0.1W 1% 0603 SMD VISHAY: CRCW060340K2FKEA 44 1 R58 RES 90.9k 0.1W 1% 0603 SMD VISHAY: CRCW060390K9FKEA 45 8 R59-R66 RES 1.0Ω 0.1W 1% 0603 SMD VISHAY: CRCW06031R00JNEA 46 2 R67, R72 (OPT) RES 0Ω 1W 2010 SMD (OPTIONAL) ROHM: MCR50JZHJ000 47 4 R77-R80 RES 6.04k 0.1W 1% 0603 SMD VISHAY: CRCW06036K04FKEA 48 1 U2 OV/UV SUPPLY PROTECTION CONTROLLER LINEAR: LTC4365ITS8#PBF 49 1 U3 FIXED 3.3V 100mA MICROPOWER LDO LINEAR: LT1761ES5-3.3#PBF 50 1 U4 2KBIT I2C SERIAL EEPROM SOT23-6 MICROCHIP: 24LC025T-I/OT Hardware: For Demo Board Only 51 1 J1 POWER JACK FROM CUI INC. PJ-002A CUI INC: PJ-002AH 52 1 J2 TERMINAL BLOCK 5mm HORZ ENTRY 2POS WURTH: 691102710002 53 1 J3 CONN HEADER 50POS 0.050 RIGHT ANGLE MOLEX: 90122-0785 54 7 JP1, JP2, JP3, JP4, JP5, JP6, JP7 2MM PIN HEADER 1X3 WURTH: 620 003 111 21 55 1 JP8 4POS DIP SWITCH C&K: TDA04H0SB1R 55 4 MH1-MH4 SPACER STACKING #4 SCREW NYLON KEYSTONE: 8831 56 7 SH1-SH7 CONN SHUNT 2MM 2POS BLACK WURTH: 608 002 134 21 57 10 TP1-TP10 TERM SOLDER TURRET 0.219"H 0.109"L MILL MAX : 2501-2-00-80-00-00-07-0 58 10 TP11, TP12, TP17-TP24 TERM SOLDER TURRET 0.156"H 0.084"L MILL MAX : 2308-2-00-80-00-00-07-0 dc2428af 25 A B C D SHARE_CLK WRITE-PROTECT ON OFF JP3 R15 10.0K VDD33 SHARE_CLK TP2 C5 0.01µF R2 100 5 WDI/RESETB 3 150K R16 49.9K R17 C6 0.1µF VOUT_EN0 TSENSE0P VDAC0 VIN_SNS ISENSEP0 ISENSEM0 VSENSEP0 VSENSEM0 VOUT_EN1 TSENSE1P VDAC1 ISENSEP1 ISENSEM1 VSENSEP1 VSENSEM1 TSENSE0M TSENSE0P Q1 NTS4173PT1G 2 R3 10.0K VDD33 R6 10.0K VDD33 CONTROL1 CONTROL0 +3.3V NOTE: THE NET PULLUP RESISTANCE ON SHARE_CLK LINE SHOULD BE BETWEEN 4.2K AND 5.5K R5 5.49K VDD33 RESET SW4 WDI/RESETB TP1 R1 10.0K VDD33 NET TIE C1 0.1µF G1 NT1 D VIN 28 18 24 38 40 3 32 15 53 9 8 41 42 1 2 4 33 16 54 60 59 43 44 63 64 4 WP SHARE_CLK 4 C7 C8 0.1µF 0.1µF VDD33 E-PAD C9 0.1µF T1 FAULTB0 FAULTB1 SCL SDA PWRGD ALERTB AUXFAULTB ASEL0 ASEL1 VOUT_EN3 CONTROL3 TSENSE3 VDAC3 GND VIN_SNS_CAP ISENSEP3 ISENSEM3 VSENSEP3 VSENSEM3 VOUT_EN2 CONTROL2 TSENSE2 VDAC2 IIN_SNSM IIN_SNSP ISENSEP2 ISENSEM2 VSENSEP2 VSENSEM2 TSENSE1M LTC2975 U1 C2 0.1µF WDI/RESETB REFP REFM VOUT_EN0 CONTROL0 TSENSE0 VDAC0 VIN_SNS NC ISENSEP0 ISENSEM0 VSENSEP0 VSENSEM0 VOUT_EN1 CONTROL1 TSENSE1 VDAC1 GND GND ISENSEP1 ISENSEM1 VSENSEP1 VSENSEM1 NET TIE NT2 TSENSE1P CHANNEL 1 CHANNEL 0 5 S VPWR 10 VDD33 VDD33 12 11 CHANNEL 2 CHANNEL 3 VDD25(IN) VDD25(OUT) 14 13 E-PAD 65 GND GND GND GND GND 19 20 21 37 39 26 NOTE: MAKE ALL TSENSE TRACES SHIELDED AND DIFFERENTIAL PLACE CAPS AND GND CONNECTIONS CAPS NEAR LTC2975 25 26 30 29 17 31 7 35 36 6 23 HI LO LO FLOAT FLOAT HI C4 0.1µF VDD33 CUSTOMER NOTICE CONTROL3 JP1 ASEL0 NET TIE NT4 3 DC2382A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. DESCRIPTION PROTOTYPE REV 1 2 SCALE = NONE DATE: N/A SIZE TECHNOLOGY 1 DEMO CIRCUIT 2382A LTC2975IUP Monday, June 22, 2015 IC NO. SHEET 1 1 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 FAULTB0 FAULTB1 SCL SDA PWRGD ALERTB 4-CHANNEL PMBUS POWER SYSTEM MANAGER TITLE: SCHEMATIC SCL AUXFAULTB TP4 SDA 1 - ALL CHIP CAPS AND CHIP RES ARE 0402 TP3 DATE MICHAEL P. 05-18-15 APPROVED NOTES - UNLESS OTHERWISE SPECIFIED: __ ECO 1 REVISION HISTORY R8 R9 R10 R11 R12 R13 10.0K 10.0K 10.0K 10.0K 10.0K 10.0K VDD33 2 APPROVALS R7 10.0K JP2 ASEL1 TSENSE3M TSENSE3P 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. S. M. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. MIKE P. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. VOUT_EN3 TSENSE3P R14 0.01µF 10.0K 34 58 CONTROL2 C20 VDAC3 TSENSE2M R4 10.0K ISENSEP3 VDD33 ISENSEM3 VSENSEP3 VSENSEM3 VOUT_EN2 TSENSE2P VDAC2 IIN_SNSM IIN_SNSP ISENSEP2 ISENSEM2 VSENSEP2 VSENSEM2 VDD33 C3 0.1µF TSENSE2P 52 51 47 48 49 50 5 22 27 57 56 55 45 46 61 62 NET TIE NT3 3 A B C D DEMO MANUAL DC2428A SCHEMATIC DIAGRAM dc2428af A B C 4 3 2 1 C12 0.1µF U2 12 11 10 9 8 7 6 5 4 3 2 1 TP9 SDA SCL WP VCC 8 5 6 7 SCL SDA DEMO BOARD IDENTITY EEPROM VSS A2 A1 A0 24LC025-I/ST DC1613 AUXSDA AUXSCL GND GPI_2 OUTEN GPI_1 ALERTB +3.3V SCL GND SDA +5V J2 TURRETS 5 TP10 TP11 GROUND TEST POINTS USBTO I2C/SMBUS/PMBUS HEADER 12POS 2MM VERT GOLD R34 10.0K D1 (GREEN) LTC2975 ON AUXSDA AUXSCL FAULTB1 FAULTB0 R37 1.40K VDD33 R32 10.0K 4 3 2 J1 DNI DNI R26 R28 4 J3 DNI R33 SHARE_CLK WDI/RESETB CONTROL0 CONTROL1 CONTROL2 CONTROL3 DNI R30 0 DNI R25 R29 DNI R24 R22 0 ALL SIZE 0402 +3.3V ALERTB AUXFAULTB PGOOD3 CUSTOMER NOTICE 1 LGKPWR 2 VIN_SNS 3 GND 4 AUXFAULTB 5 SCL 6 ALERTB 7 SDA 8 CONTROL0 9 CONTROL2 10 CONTROL3 11 WDI/RESETB 12 CONTROL1 13 SPARE3 (PGOOD) 14 SHARE_CLK 15 FAULT4 16 FAULT2 17 FAULT3 18 FAULT1 19 SPARE 4 20 GND BUS SIGNALS: R21 DNI R19 100k VDD33 PGOOD_IN PGOOD2 PGOOD1 PGOOD0 APPROVALS R35 100k VDD33 R27 100k VDD33 R20 100k VDD33 3 DC2382A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 SCALE = NONE 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. S. M. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. MIKE P. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 1 3 5 7 9 11 13 15 17 19 1 3 5 7 9 11 13 15 17 19 BOARD-TO-BOARD CONNECTOR TO CASCADE MULTIPLE DEMO BOARDS ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN 2 4 6 8 10 12 14 16 18 20 2 4 6 8 10 12 14 16 18 20 D 2 1 CONTROL0 PG_IN SW0 SW0 CONTROL1 PG_0 SW1 SW1 CONTROL2 PG_1 SW2 SW2 CONTROL3 PG_2 SW3 SW3 DATE: N/A SIZE TECHNOLOGY 1 DEMO CIRCUIT 2382A LTC2975IUP Monday, June 22, 2015 IC NO. SHEET 2 1 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 CONTROL3 CNTRL3 DEBOUNCE C14 0.01µF R36 100 TP8 CONTROL2 CNTRL2 R31 100 DEBOUNCE C13 0.01µF TP7 CONTROL1 CNTRL1 DEBOUNCE C11 0.01µF R23 100 TP6 CONTROL0 CNTRL0 R18 100 DEBOUNCE C10 0.01µF TP5 1 4-CHANNEL PMBUS POWER SYSTEM MANAGER TITLE: SCHEMATIC JP7 JP6 JP5 JP4 1 HI GND 3 1 HI GND 3 2 2 2 2 1 HI GND 3 1 HI GND 3 5 A B C D DEMO MANUAL DC2428A SCHEMATIC DIAGRAM dc2428af 27 A B C D VIN TSENSE3P VDAC3 VOUT_EN3 VSENSEP2 ISENSEP2 AUXSDA TSENSE2P VDAC2 VOUT_EN2 VSENSEP3 ISENSEP3 VSENSEP0 ISENSEP0 VIN_SNS TSENSE0P VDAC0 VOUT_EN0 VSENSEP1 ISENSEP1 IIN_SNSP TSENSE1P VDAC1 VOUT_EN1 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 TSENSE3M PGOOD3 VSENSEM3 ISENSEM3 VSENSEM2 ISENSEM2 AUXSCL TSENSE2M PGOOD2 VSENSEM1 ISENSEM1 IIN_SNSM TSENSE1M PGOOD1 TSENSE0M PGOOD0 VSENSEM0 ISENSEM0 5 BOARD TO BOARD CONNECTOR MATES WITH DC2363A 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 J4 VIN 3 2 4 C28 10n C23 10n D2 (RED) R38 1.40K U4 D3 (RED) 3 DC2382A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. C29 10n C24 10n D4 (RED) R40 1.40K U5 ISENSEM2 ISENSEP2 C30 10n C25 10n Q2 D5 (RED) R41 1.40K 2 APPROVALS 2 SCALE = NONE DATE: N/A SIZE TECHNOLOGY C31 10n C26 10n TP14 FAULTB0 TP12 ALERTB 1 DEMO CIRCUIT 2382A LTC2975IUP Monday, June 22, 2015 IC NO. TP15 FAULTB1 TP13 PWRGD SHEET 3 1 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 ISENSEM3 ISENSEP3 1 D6 (GREEN) R42 1.40K 1 4-CHANNEL PMBUS POWER SYSTEM MANAGER TITLE: SCHEMATIC INPUT FILTERS FOR CURRENT SENSING PLACE CLOSE TO LTC2975 ISENSEM1 ISENSEP1 VDD33 R39 1.40K 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. S. M. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. MIKE P. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. CUSTOMER NOTICE ISENSEM0 ISENSEP0 FAULTB1 FAULTB0 PWRGD ALERTB AUXFAULTB C15 0.1µF 2 AUXFAULTB SN74LVC2G07DCKR 2 ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN 4 VCC GND 1 6 1Y 1A 1 5 2 2 FAULTB0 SN74LVC2G07DCKR ALERTB 1 4 2Y 2A 3 VCC GND 1 6 1Y 1A 1 5 2 2 FAULTB1 1 4 2Y 2A 3 PWR GOOD 1 3 28 2 5 A B C D DEMO MANUAL DC2428A SCHEMATIC DIAGRAM dc2428af 1 3 2 GND C1 220uF/20V R4 80.6k R3 221k R2 2.1M GND GND C2 22uF/25V +VIN R5 100k 3 2 5 1 G1 S1 OV UV SHDN VIN U2 LTC4365 D1 M1 SI4946BEY 8 GATE GND VOUT G2 /FAULT S2 GND 4 GND D2 6 7 GND C3 22uF/25V R1 10m TSENSE0P C47 C48 C49 C50 R9 49.9k R8 49.9k R7 49.9k R6 49.9k GND GND GND GND OPERATION MODE CLKIN CLKOUT RUN_CH0 RUN_CH1 RUN_CH2 RUN_CH3 3P3V 4x 22uF/25V DCM CCM R43 10k 2 1 4 3 2 1 ON GND C7 J3 K5 L6 K7 L4 L3 L5 J4 H6 J6 H4 H3 H5 F4 E6 F6 E4 E3 E5 C4 B6 C6 B4 B3 B5 AGND C20 100n AGND R50 0 GND TDA04H0SK1 JP8 DC2363A OPTIONAL TEMP SENSE Q1 R52 0 CLKIN CLKOUT VIN4 VIN4 SVIN4 RUN4 INTVCC4 MODE4 VIN3 VIN3 SVIN3 RUN3 INTVCC3 MODE3 VIN2 VIN2 SVIN2 RUN2 INTVCC2 MODE2 VIN1 VIN1 SVIN1 RUN1 INTVCC1 MODE1 U1 LTM4644 TEMP F3 J2 691102710002 R45 10k VOUT4 FB4 TRACK/SS4 COMP4 VOUT3 FB3 TRACK/SS3 COMP3 VOUT2 FB2 TRACK/SS2 COMP2 VOUT1 FB1 TRACK/SS1 COMP1 GND C11 OPT GND C10 OPT GND C9 OPT GND C8 OPT GND C4 10n CUSTOMER NOTICE K6 L7 J7 K2 K1 J1 G6 H7 G7 G2 G1 F1 D6 E7 D7 D2 D1 C1 A6 B7 A7 A3 A2 A1 Quad 4A DC/DC Converter SGND F7 (OV/UV/Reverse) R44 10k 4 3 2 1 5 6 7 8 GND G3 G5 G4 H2 H1 C5 D5 D4 D3 E2 E1 B2 B1 A5 K4 K3 F5 L2 L1 J5 A4 Input Protection R46 10k PG1 PG2 PG3 PG4 C3 C2 F2 J2 AGND SCALE = NONE MTP MTP R21 20.5k APP ENG. C13 47uF/10V C14 47uF/10V GND GND B C15 47uF/10V +1.0V GND R20 14.3k +1.5V R19 8.25k 1a C12 47uF/10V +2.5V GND R18 6.81k PCB DES. R13 8.25k AGND R12 3.65k AGND R11 1.74k AGND R10 1.21k +3.3V - C36 330uF C35 330uF C34 330uF C33 330uF www.linear.com C19 22uF/10V C18 22uF/10V C17 22uF/10V C16 22uF/10V ISP0 ISM0 VDAC0 VOUT_CH0 GND ISP1 ISM1 VDAC1 VOUT_CH1 GND ISP2 ISM2 VDAC2 VOUT_CH2 GND LTC CONFIDENTIAL FOR CUSTOMER USE ONLY TRACK3 TRACK2 TRACK1 TRACK0 PG0 PG1 PG2 PG3 06-12-15 ISP3 ISM3 VDAC3 VOUT_CH3 GND IIN_SNSM IIN_SNSP VIN_SNS VIN M Peters LTM4644 Quad 4A Supply with 50-pin Connector to Power System Manager LTM4644 Demo Circuit 2363A 1a R80 6.04k 10m R17 R79 6.04k 10m R16 R78 6.04k 10m R15 R77 6.04k 10m R14 Production DEMO MANUAL DC2428A SCHEMATIC DIAGRAM dc2428af 29 GND VOUT_CH0 GND VOUT_CH1 GND VOUT_CH2 GND VOUT_CH3 PG0 PG1 PG2 PG3 1 LED2 R23 2k LED1 R24 2k 1 1 1 1 1 1 1 1 1 1 SNS- SNS+ SNS- SNS+ SNS- SNS+ SNS- SNS+ 100 R38 100 R37 100 R36 100 R35 100 R34 100 R33 100 R32 100 R31 C43 10n C41 10n C39 10n C37 10n GND C44 10n GND C42 10n GND C40 10n GND C38 10n NOTE: REMOVE R59-R66 FOR REMOTE SENSING R66 R65 R64 R63 R62 R61 R60 R59 LED0 R25 2k INT4 GND VSNSM_CH0 VSNSP_CH0 VSNSM_CH1 VSNSP_CH1 VSNSM_CH2 VSNSP_CH2 VSNSM_CH3 VSNSP_CH3 1 M2 M3 M4 M5 DMG1012 DMG1012 DMG1012 DMG1012 LED3 R22 2k INT3 Voltage Sense Filtering 100k R26 R_ARRAY_4X_CRA06S 3 2 1 INT2 1 2 INT1 LED Indication 1 2 3 2 2 3 2 1 2 3 30 2 ISM0 ISP0 ISM1 ISP1 ISM2 ISP2 ISM3 ISP3 1 2 1 2 2 1 2 1 3 C25 OPT C21 10n GND 4 3 4 3 C31 OPT C24 10n C29 OPT C23 10n C27 OPT C22 10n GND GND GND DC2363A R30 2x1K R29 2x1K 2x1K 3 4 R28 R_ARRAY_2X_ACAS0606 2x1K 4 R27 R_ARRAY_2X_ACAS0606 C32 OPT C30 OPT C28 OPT C26 OPT CUSTOMER NOTICE ISNSM_CH0 ISNSP_CH0 ISNSM_CH1 ISNSP_CH1 ISNSM_CH2 ISNSP_CH2 ISNSM_CH3 ISNSP_CH3 Current Sense Filtering 1a Production GND 49 47 45 43 41 39 37 35 33 31 29 27 25 23 21 19 17 15 13 11 9 7 5 3 1 50 48 46 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 CONN_2X25_MALE J3 IIN_SNSP ISNSP_CH1 VSNSP_CH1 RUN_CH0 VDAC0 TSENSE0P VIN_SNS ISNSP_CH0 VSNSP_CH0 AUX_SDA ISNSP_CH2 VSNSP_CH2 VIN RUN_CH1 VDAC1 ISNSP_CH3 VSNSP_CH3 RUN_CH2 VDAC2 RUN_CH3 VDAC3 MTP SCALE = NONE MTP PCB DES. APP ENG. ISNSM_CH0 VSNSM_CH0 PG0 IIN_SNSM ISNSM_CH1 VSNSM_CH1 PG1 AUX_SCL ISNSM_CH2 VSNSM_CH2 VIN PG2 ISNSM_CH3 VSNSM_CH3 PG3 B GND 49 47 45 43 41 39 37 35 33 31 29 27 25 23 21 19 17 15 13 11 9 7 5 3 1 J4 www.linear.com IIN_SNSP ISNSP_CH1 VSNSP_CH1 RUN_CH0 VDAC0 TSENSE0P VIN_SNS ISNSP_CH0 VSNSP_CH0 AUX_SDA ISNSP_CH2 VSNSP_CH2 VIN RUN_CH1 VDAC1 ISNSP_CH3 VSNSP_CH3 RUN_CH2 VDAC2 RUN_CH3 VDAC3 LTM4644 Quad 4A Supply with 50-pin Connector to Power System Manager LTM4644 Demo Circuit 2363A 1a 50 48 46 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 Test Points/ Optional Header ISNSM_CH0 VSNSM_CH0 PG0 IIN_SNSM ISNSM_CH1 VSNSM_CH1 PG1 AUX_SCL ISNSM_CH2 VSNSM_CH2 VIN PG2 ISNSM_CH3 VSNSM_CH3 PG3 05-12-15 LTC CONFIDENTIAL FOR CUSTOMER USE ONLY M Peters Board-to-Board Connector - DEMO MANUAL DC2428A SCHEMATIC DIAGRAM dc2428af R53 R54 GND By default, jumpers set to SoftStart SS TRK R55 C6 10n 1 2 3 JP6 SS TRK GND Parallel CH2 and CH3 Parallel CH0 and CH1 RUN_CH2 COMP2 TRACK2 FB2 VOUT_CH2 RUN_CH0 COMP0 TRACK0 FB0 VOUT_CH0 DNI DNI 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. R67 thru R76 are 0 ohm R76 DNI DNI R74 DNI R75 DNI R73 R72 R71 DNI DNI R69 DNI R70 DNI R68 R67 RUN_CH3 COMP3 TRACK3 FB3 VOUT_CH3 RUN_CH1 COMP1 TRACK1 FB1 VOUT_CH1 Optional Jumpers for Parallel Operation TRACK0 TRACK1 TRACK2 60.4k 19.1k GND C5 10n 1 2 3 JP5 60.4k 40.2k R56 VOUT_CH3 R57 Tracking/SoftStart Jumpers 60.4k 90.9k R58 C7 10n 1 2 3 JP7 SS TRK PINHD-1X3-2MM 1 2 3 JP4 PINHD-1X3-2MM 1 2 3 JP3 PINHD-1X3-2MM 1 2 3 JP2 PINHD-1X3-2MM 1 2 3 JP1 VOUT_CH0 VOUT_CH1 VOUT_CH2 VOUT_CH3 DC2363A CUSTOMER NOTICE By default, jumpers set to pre-load ON GND 10R R42 GND 15R R41 GND 25R R40 GND 33R R39 Pre-Load Jumpers MTP APP ENG. SCALE = NONE MTP PCB DES. AUX_SDA AUX_SCL VIN 1a Production B GND GND U3 OUT 5 A0 5 A1 4 2 GND C46 1uF GND www.linear.com GND C45 10nF LTC CONFIDENTIAL FOR CUSTOMER USE ONLY 05-12-15 LTM4644 Quad 4A Supply with 50-pin Connector to Power System Manager LTM4644 Demo Circuit 2363A 1a Addr 0x51 24LC025 3 SDA VCC 6 1 SCL U4 LT1761ES5-3.3 3 SHDN BYP 4 2 GND 1 IN 3P3V M Peters +3.3V LDO and Identity EEPROM - DEMO MANUAL DC2428A SCHEMATIC DIAGRAM dc2428af 31 DEMO MANUAL DC2428A 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 dc2428af 32 Linear Technology Corporation LT 0915 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015