DEMO MANUAL DC2023A 16-Channel Power Supply System Featuring the LTM2987 Power System Manager Description configure up to eight DC2023A boards, thereby control- The DC2023A is a demonstration system for the LTM 2987 2 ling up to 128 separate power supply rails. Larger arrays 16-channel I C/SMBus/PMBus power system manager 2 of LTM2987s are supported through programmable I C with EEPROM. The LTM2987 monitors and controls 16 base address or bus segmentation. power supply rails. The DC2023A demonstrates the abil- ity of the LTM2987 to sequence, trim, margin, supervise, The DC2023A demo board can be powered by an external monitor, and log faults for 16 power supply rails. Each power supply, such as a +12VDC supply. Communication power supply channels output voltage is monitored and with the software is provided through the DC1613 USB-to- the LTM2987 monitors its own internal die temperature. 2 I C/SMBus/PMBus Controller. The following is a checklist of items which can be obtained from the LTC website or The DC2023A is a single circuit board that contains sixteen LTC Field Sales. independent power supply rails. The board employs sixteen LTC 3405A 300mA switch-mode regulators, which are 2 USB-to-I C/SMBus/PMBus Controller (DC1613) configured to be controlled by the LTM2987. The LTM2987 LTpowerPlay Software is available in a Module (micromodule) package and contains two LTC2977 devices. This board provides a DC2023A Features sophisticated 16-channel digitally programmable power Sequence, Trim, Margin, and Supervise Sixteen Power supply system. The rail voltages are programmable within Supplies the trim range shown in the Performance Summary. Manage Faults, Monitor Telemetry, and Create Fault This demonstration system is supported by the Logs LTpowerPlay graphical user interface (GUI) that enables PMBus Compliant Command Set complete control of all the features of the LTM2987. To- Supported by LTpowerPlay GUI gether, the LTpowerPlay software and DC2023A hardware Margin or Trim Supplies to 0.25% Accuracy system create a powerful development environment for Fast OV/UV Supervisors Per Channel designing and testing LTM2987 configuration settings. Supports Multi-Channel Fault Management These settings can be stored in the devices internal Automatic Fault Logging to Internal EEPROM EEPROM or in a file. This file can later be used to order Operates Autonomously without Additional Software pre-programmed devices or to program devices in a Sixteen OV/UV V and Two V Supervisors OUT IN production environment. The software displays all of Telemetry Reads Back V , V , and Temperature IN OUT the configuration settings and real time measurements 16-Channel Time-Based Output Sequencer 2 from the LTM2987. Telemetry allows easy access and I C/SMBus Serial Interface decoding of the fault log created by the LTM2987. The Integrated Decoupling Capacitors and Pull-Up Resistors board comes pre-programmed with the EEPROM values Powered from 6V to 14VDC appropriate for the sixteen power supplies used on the Available in 144-Lead 15mm 15mm BGA DC2023A. Just plug and play Design files for this circuit board are available at Multiple DC2023A board sets can be cascaded together DEMO MANUAL DC2023A performance s ummary Specifications are at T = 25C A POWER SUPPLY CHANNEL CH(0:7) CH(8:15) Manager 1/2 LTM2987 1/2 LTM2987 Nominal Untrimmed Output Voltages 1.0V, 1.1V, 1.2V, 1.3V, 1.4V, 1.5V, 1.7V, 1.8V 2.0V, 2.2V, 2.5V, 2.7V, 3.0V, 3.1V, 3.2V, 3.3V Rated Output Current 0.3A Default Margin Range 5% Output Trim Range (V = 1.38V) +13/19 % +11/15% FS VDAC Temperature 2 Internal Common CharacteristicsSpecifications Valid Over Full Operating Temperature Range VALUE PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Input Voltage Range 6 14 V ADC Total Unadjusted Error V 1V 0.25 % IN ADC ADC Voltage Sensing Input Range Differential Voltage: V = (V V ) 0 6 V IN ADC SENSEP n SENSEM n Glossary of t erms PMBus An industry standard power-management proto- The following list contain terms used throughout the col with a fully defined command language that facilitates document. communication with power converters and other devices Channel The collection of functions that monitor, su- in a power system. pervise, and trim a given power supply rail. Rail The final output voltage that the power supply EEPROM Non-volatile memory (NVM) storage used to controller manages. retain data after power is removed. Supervise The act of quickly responding to a voltage, Margin Term used typically in board level testing that current, temperature condition that is compared to pre- increases/decreases the output voltage to look for sensi- programmed values (fault settings). tivity/marginality problems Trim The act of adjusting the final output voltage. A Monitor The act of measuring voltage, current and servo loop is typically used to trim the voltage. temperature readings. NVM Non-volatile memory, see EEPROM. dc2023afa 2