Linear Technology DC980A Manual

Description
The DC980A and DC980B are a demonstration system that
showcases the LTC2970, a dual power supply monitor and
margining controller with an I
board contains the LTC2970 device and the DC980B
board contains the LTC3828
two boards interface to each other via a 20-pin connec-
tor. The DC980B board features the LTC3828 dual output,
2-phase synchronous buck regulator. The LTC2970's
two voltage-buffered, 8-bit IDACs allow highly accurate
margining of the LTC3828's output voltages. The IDACs
can be configured to automatically servo the power sup-
plies to a desired voltage using the ADC for feedback. The
DC980B comes preconfigured with 3.3V and 5V power
supply rail voltages.
The LTC2970's low drift reference and 14-bit ∆∑ A/D
converter allow precise measurements of two power sup-
ply output voltages and load currents. Fault management
allows ALERTB to be asserted for configurable over- and
undervoltage fault conditions.
This demonstration system is supported by the
LTpowerPlay™ graphical user interface (GUI) which enables
complete control of all the features of the device. Together,
the LTpowerPlay software and DC980A/DC980B hardware
system create a powerful development environment for
designing and testing hardware configurations for the
LTC2970. The software displays the LTC2970 features and
provides real time measurements from the device's ADC
and status registers. Telemetry also allows easy access
of the fault status created by the LTC2970.
The LTC2970 features may be evaluated with the LTC3828
based power supplies, or alternatively the DC980B board
may be removed and DC980A can then be connected to
an external power supply circuit.
and Margining Controller with LTC3828
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C interface. The DC980A
dual DC/DC controller. The
DEMO MANUAL
DC980A/DC980B
Dual Power Supply Monitor
Dual DC/DC Supply
The DC980B demo board is powered by an external 8V
to 15V power supply. To power the DC980A demo board,
you have two choices. It may be powered from either the
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DC590 USB-to-I C controller or from the DC980B board
using an external jumper wire. Communication with the
software is provided through the DC590 USB-to-I
troller. The following is a checklist of items which can be
obtained from the LTC website or LTC field sales.
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USB-to-I C/Serial Controller (DC590)
n
LTpowerPlay Software
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DC980A/DC980B Features
Monitors and Margins Two Power Supplies
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Two Output Voltage Monitors
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Two Input Voltage Monitors
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Two Output Current Monitors
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Telemetry Reads Back V
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Supported by LTpowerPlay GUI
n
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I C Adjustable OV/UV Trip Points
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Margin or Trim Supplies to ±0.5% Accuracy
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I C/SMBus Serial Interface
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Programmable GPIO for Fault Reporting
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Powered from External Power Supply
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LTC2970 Available in 24-Pin QFN Package
n
Design files for this circuit board are available at
http://www.linear.com/demo/DC980
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.
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C con-
, V , I , Temperature
IN OUT OUT
dc980abf
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