Vicor PRM-AL Customer Evaluation Boards - Manual (Page 6)

UG:003 vicorpower.com Applications Engineering: 800 927.9474 Page 6
4.0 Test Sequence
4.1 Have the latest version of the PRM® data sheet in hand.
4.2 Assure that the DC supply is set to 0 Vdc prior to turning the unit on.
4.3 Confirm that the switch bank is configured as shown in the silk screen
on the board.
4.4 Turn on the DC supply.
4.5 Make sure the DC load is set to constant current and at 0 A prior to turning
on the load.
4.6 Turn on the DC load.
4.7 Connect an oscilloscope to the test point provided to monitor output voltage.
Many types of scope probes may be directly connected to these points if the
probe is equipped with a removable plastic sheath. Be careful to avoid
creating ground loops when making measurements of this voltage and the
input voltage. It is recommended that themeasurements be made separately.
Shorting the -input and -output of the PRM will defeat the PRM current limit
feature as the current shunt is in this path.
4.8 Turn on a fan if desired.
4.9 Raise the DC input voltage to the nominal value indicated on the data sheet.
4.10 Verify no load operation by raising and lowering the input voltage through
the entire input voltage range. The output voltage should remain constant
within the tolerance indicated in the data sheet.
4.11 Re-establish the nominal input voltage.
4.12 Slowly increase the load current to full load while monitoring the output
voltage. The output voltage should remain within the limits specified in the
appropriate PRM data sheet.
4.13 Return the load current to 0 A and decrease the input voltage to low line.
4.14 Repeat step 4.12. Depending upon the supply used and the source impedance
it may be necessary to adjust the input voltage to keep the input to the
PRM at low line.
4.15 Return the load current to 0 A and increase the input voltage to high line.
4.16 Repeat step 4.12.
5.0 You have now verified the functionality of the PRM over the entire line and
load operating range.
6.0 Deviating from Nominal Settings
This board has provisions, as described in the Board Overview section, to adjust the
configuration of the PRM about the nominal values. The data sheet for the PRM has
equations and curves for determining the required resistor values needed for
specific conditions.
Applications requiring output voltages other than the nominal setting will need to
have the new value set via the trim pots and respective switches. Reference Items 4
and 5 of the Board Overview and the schematic shown in Figure 2.