1
dc1540bf
DEMO MANUAL DC1540B
DESCRIPTION
LTC2977 8-Channel
Power System Manager
with EEPROM
The DC1540B is a demonstration system for the
8-channel I
2
C/SMBus/PMBus Power System Manager
with EEPROM. It consists of 2 circuit boards namely the
DC1360B and DC1361B. The DC1360B contains all the
circuitry needed to insert the LTC2977 into a power system
and control eight power supplies. The DC1361B contains
eight power supplies (LTM4603EV) which are configured
to be controlled by an LTC2977. Together these two boards
form a sophisticated, 8-channel, digitally programmable
power supply.
This demonstration system is supported by LTpowerPlay™
software and a graphical user interface (GUI) that enables
complete control of all the LTC2977 features. You can obtain
this GUI from the website www.linear.com/ltpowerplay.
com. LTpowerPlay and the DC1540B, create a powerful
development environment in which you can design config-
uration settings for the LTC2977. The configuration settings
can be stored in the LTC2977 EEPROM and also in a file,
which can be used to order pre-programmed devices.
LTpowerPlay displays all of the configuration settings and
real-time measurements that the LTC2977 performs and
allows easy access to the fault log created by the LTC2977.
The LTC2977 on the DC1360B comes pre-programmed with
EEPROM values appropriate for the eight power supplies
used on the DC1361B.
The LTC2977 can be configured to monitor current
on odd numbered channels. In the DC1540B, this
feature can be enabled on Channel 7 (see “Measur-
ing Current”). Channels 1 and 2 can be configured
to do coincident tracking of Channel 0 by using JP2
and JP3 (see “DC1361B Details – Top Side”). An LTC
Hot Swap™ circuit on the DC1361B enables the LTC2977 to
soft-start V
IN
and shut off V
IN
in response to output faults.
Multiple DC1540Bs can be cascaded together to form
a high channel count power supply (see “Multi-Board
Arrays”). This configuration demonstrates features of the
LTC2977 which allow timing and fault information to be
L
, LT, LTC, LTM, Linear Technology, and the Linear logo are registered trademarks and
LTpowerPlay and Hot Swap are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
shared across multiple LTC2977s, allowing the formation
of a single, coherent power supply control system. This
configuration is easily supported by the LTpowerPlay
GUI and allows the user to configure up to 9 LTC2977s,
controlling up to 72 separate power supplies.
To get this demo system up and running, connect the
DC1540B to your computer using a DC1427A or a DC1613
(USB to I
2
C/SMBus/PMBus Controller). The following is
a checklist of items which you can obtain from the LTC
website or LTC Field Sales.
n
USB to I
2
C/SMBus/PMBus Controller (DC1613A)
n
LTpowerPlay GUI
n
LTC2977 Resistor Selection Tool for calculating
resistors values and proper DAC range settings
(in the GUI)
LTC2977 Features
• I
2
C/SMBus Communication
• Configuration EEPROM
• PMBus Compliant
• Fault Logging to Internal EEPROM
• Differential Input, 16-bit
∆S
ADC with less than ±0.25%
of Total Unadjusted Error Using On-Chip Reference
• Monitors Eight Output Channels and One Input Voltage
• Programmable Watchdog Timer
• 8-Channel Sequencer
• Eight 10-Bit OV/UV Supervisors
• Eight 10-Bit Margin/Trim DAC’s with Soft-Connect
• A Closed-Loop Digital Servo Accurately Trims the Outputs
• Supports Multi-Channel Fault Management
• Programmable Fault Responses
• On-Chip Digital Temperature Sensor
Design files for this circuit board are available at
