Installation and Operation
2018 Microchip Technology Inc.
DS50002834A-page 12
2.3.1.2
BOARD POWER-UP PROCEDURE
For the power-up procedure, follow the steps below:
1. Connect the PC, input supply, voltmeter, ammeter and load as shown in
Figure 2-2
. Set the ammeter on a 10A range.
2. Fit a jumper on the EN position across the J6 header, as marked on the silk-
screen.
3. Once the input voltage is greater than 2.35V at the board input (V
IN
), the device
begins to switch.
4. The Voltmeter should now indicate an output voltage according to the preset
register values. Adjusting the input voltage and load should not cause the output
to vary more than a few mV over the operating range of the converter.
5. Set the input voltage and the load to the desired values, with a maximum of 5.5V
on the input voltage and a maximum load of 3A.
6. Adjust the regulator output and monitor the STATUS registers, as described in
Chapter 4. “GUI Description”
.
7. Optionally, for more advanced readings, place Oscilloscope probe 1 in “SW” test
point to monitor the switching waveforms and probe 2 on the output header
(close to the output capacitors) to measure the AC ripple of the output voltage.
FIGURE 2-2:
MIC23356 Evaluation Board Test Setup.
Note:
The inductance associated with long wires on the board input may cause
voltage spikes at load stepping or start-up into heavy load. If the spikes
exceed the 5.5V maximum input voltage rating, the MIC23356 may fail.
This can be prevented by populating a 470
µ
F Electrolytic Capacitor on C8
footprint.
Oscilloscope
CH1
CH2
Voltmeter
Load
Ammeter (10A)
Power
Supply
-
+
I
2
C Monitor
(PC)
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