1
dc2518af
DEMO MANUAL DC2518A
DESCRIPTION
LTC2975
4-Channel PMBus Power System Manager
with ±12V and ±48V Power Supply Rails
The DC2518A is a demonstration system for the
Power System Manager that interfaces to various regula-
tors. The board contains all the circuitry needed to use
the LTC2975 in a power system and control four power
supplies. The four power supplies include linear and
switching regulators for the purpose of demonstrating a
variety of methods to sense voltage and current. The demo
board provides a sophisticated, digitally programmable
4-channel power supply system.
The LTC2975 is a 4-channel I
2
C/SMBus/PMBus Power
System Manager that features accurate input current and
energy measurement. The device monitors input current
and input voltage to calculate input power and energy.
The DC2518A demonstrates the ability of the LTC2975
to sequence, trim, margin, supervise, monitor, and log
faults for four power supplies. The LTC2975 monitors
each channel’s output voltage and output current and also
monitors each channel’s external temperature sensor and
its own internal die temperature.
The DC2518A board contains four independent power sup-
ply rails. The +12V/–12V rails are based on LDO regulators,
and the +48V/–48V rails are based on DC/DC switching
regulators. The board is pre-configured with these volt-
ages and may be re-configured 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 DC2518A hardware system create a power-
ful 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
DC2518A. Just plug and play!
L
, LT, LTC, LTM, Linear Technology and the Linear logo, Linear Express and LTpowerPlay are
registered trademarks of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Order pre-programmed devices from Linear Express
®
using LTpowerPlay.
The following items are required:
• +12VDC Power Supply
• USB-to-I
2
C/SMBus/PMBus Controller (DC1613)
• LTpowerPlay Software
• PC
DC2518A Features
• Sequence, Trim, Margin, and Supervise Four Power
Supplies
• Manage Faults, Monitor Telemetry, Create Fault Logs
• PMBus Compliant Command Set
• Supported by LTpowerPlay GUI
• Margin or Trim Supplies to 0.25% Accuracy
• Four I
OUT
and One I
IN
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
• I
2
C/SMBus Serial Interface
• Powered from 9V to 14V
Design files for this circuit board are available at
