DC2739A - Schematic7/20/2018
- 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
- Multichannel 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
The DC2739A is a two-board demonstration system consisting of the DC2675A and DC2363A. The DC2675A contains all the circuitry needed to use two LTC®2972 Power System Managers to control four power supplies. The DC2363A contains four power supplies (LTM®4644-1quad 4A µModule® regulator) which are configured to be controlled by the two LTC2972 devices. The DC2363A and DC2675A demo boards together provide a sophisticated 4-channel digitally programmable power supply system.
The LTC2972 is a 2-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 DC2675A demonstrates the ability of the LTC2972 to sequence, trim, margin, supervise, monitor, and log faults for four power supplies. The LTC2972 monitors each channel’s output voltage and output current and also 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 is pre-configured with 1.0V, 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 LTC2972. Together, the LTpowerPlay software and DC2739A hardware system create a powerful development environment for designing and testing configuration settings of the LTC2972. LTpowerPlay stores these settings in the LTC2972’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 LTC2972. The board comes preprogrammed with the EEPROM values appropriate for the four power supply rails on the DC2739A. Just plug and play!
Multiple DC2739A boards can be cascaded together to form a high channel count power supply (see Multi-Board Arrays). This cascaded configuration demonstrates features of the LTC Power System Management ICs which enable timing and fault information that is shared across multiple Power System Management ICs. The user can configure up to eight DC2739A boards, thereby controlling up to 32 separate power supply rails. Larger board arrays can be built using programmable I2C base addresses or bus segmentation.
Order preprogrammed devices from Linear Express using LTpowerPlay.
The following items are required:
- +12VDC Power Supply
- USB-to-I2C/SMBus/PMBus Controller (DC1613)
- LTpowerPlay Software
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