Using the MPM
10
If you press SW3 to initiate power-up sequencing, the MPM state changes to Starting and you can see the various
regulator enabled LEDs on the SF2-DMPM-DB turning on in sequence. If the status does not change to Started and
the power-on sequence restarts, you can adjust the voltage of the individual APOL channels via the associated
potentiometers to complete the sequencing. If open-loop trimming is enabled, the open-loop trim pin voltage will only
achieve nominal value if the potentiometer is suitably adjusted.
When power sequencing has completed and all regulators have reached nominal voltage, the status changes to
Started and APOL closed-loop trimming is also enabled, if applicable. Closed-loop trimming keeps the APOL channel
output voltage at the nominal value specified in the GUI, even when the potentiometer is adjusted. You can disable
trimming by removing the Trim jumper for a given regulator. The following list shows which jumper configures which
APOL:
Removing one of these jumpers disables closed-loop trimming for the associated APOL therefore, the output voltage
can be varied using the potentiometer for that channel. Reinstalling the jumper reactivates closed-loop trimming and
brings it back to nominal.
Table 5 • MPM Status Description
Jumper APOL
JP3 1
JP26 2
JP27 3
JP28 4
JP2 5
JP29 6
JP30 7
JP31 8
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