Linear Technology DC1962C, Демонстрационное руководство

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dc1962cf
DEMO MANUAL DC1962C
common Demo BoarD operations
Margin All Rails
The digital power products on the DC1962C not only
monitor each of their respective 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
(LTC2974 and LTC2977 only).
A look at the telemetry window shows the effect of the
margin high or margin low operation. The following screen
shot shows all rails going from nominal set points to
margin high, margin low, and back to nominal voltages.
Each of the power management ICs has a multiplexed ADC
that is used to provide voltage, current, and temperature
readback values. The telemetry plot in the GUI is similar to
a multichannel oscilloscope which is capable of displaying
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. See corresponding data sheet.