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dc2023afa

DEMO MANUAL DC2023A

Margin All Rails

The LTM2987 power manager on the DC2023A not only

monitors each of the sixteen outputs but can margin the

outputs either high or low. Margining is the operation

that moves a rail either up or down for testing purposes.

It allows a system to be fully characterized over supply

limits without the use of external hardware or resources.

The GUI provides an easy way to margin all rails high

or all low by clicking one of four buttons. To invoke the

margining dialog, click the GroupOp icon in the toolbar.

The buttons labeled “ignore faults” will margin

without creating a fault even if the fault limits

are exceeded.

common Demo BoarD operations

A look at the telemetry window shows the effect of the

marginhighormarginlowoperation.Thefollowingscreen

shot shows all rails going from nominal set points to

margin high, margin low, and back to nominal voltages.

Each LTC2977 inside the module has a multiplexed ADC

that is used to provide voltage, current, and temperature

readback values. The telemetry plot in the GUI is similar to

amulti-channeloscilloscopewhichiscapableofdisplaying

any parameter that is displayed in the telemetry window.

Due to the nature of a multiplexed ADC converter, it has

an associated ADC loop time. The total ADC loop time

(~100ms to 160ms) for a given channel is dependent on

the device’s configuration. Refer to the LTM2987 data

sheet for complete ADC timing specifications.

Creating a Fault

There is a pushbutton on the DC2023A board that is used

toforceafaultanddemonstratethedemoboard’sabilityto

detectitandrespondaccordingtotheconfiguration.When

depressed, the pushbutton creates a fault on channel 10,

the 2.5V output (GUI channel U1:2). The user should see

alloutputspoweroff,thefaultLEDmomentarilyilluminate,

thealertLEDilluminatecontinuously,andallrailssequence

back on after a retry period. The user may also short any

power supply output indefinitely. This

is a good way to induce UV faults and

shows that a shorted channel will not be

damaged. Use a jumper wire or a coin

to short any output.

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