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dc980abf

DEMO MANUAL

DC980A/DC980B

Description

Dual Power Supply Monitor

and Margining Controller with LTC3828

Dual DC/DC Supply

The DC980A and DC980B are a demonstration system that

showcasestheLTC2970,adualpowersupplymonitorand

board contains the LTC2970 device and the DC980B

board contains the LTC3828 dual DC/DC controller. The

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™graphicaluserinterface(GUI)whichenables

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.ThesoftwaredisplaystheLTC2970featuresand

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.

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.

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

using an external jumper wire. Communication with the

troller. The following is a checklist of items which can be

obtained from the LTC website or LTC field sales.

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LTpowerPlay Software

DC980A/DC980B Features

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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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Supported by LTpowerPlay GUI

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Margin or Trim Supplies to ±0.5% Accuracy

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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

Design files for this circuit board are available at

http://www.linear.com/demo/DC980