Enpirion
®
Power Evaluation Board User Guide
EN2340QI
PowerSoC
CAUTION
:
With the resistor divider between PVIN and Enable and GND, if you
decide to supply an external AVIN, then AVIN has to be turned on before PVIN,
and turned off after PVIN. Not following this sequence can damage the device.
CAUTION
:
Be mindful of the AVIN input polarity. There is no reverse polarity
protection on this input.
CAUTION:
Do not apply an external AVIN to the device with the J1 jumper
populated. Doing so will damage the device.
STEP 4:
Connect the load to the output connectors VOUT (J6) and GND (J10), as
indicated in Figure 4.
STEP 5:
Select the output voltage setting jumper. Figure 2 shows what output voltages
are achieved by selecting each jumper position. Note that depending on the tolerance of
the resistors populated on the board, each output voltage setting may have a larger
tolerance than just the VFB pin as specified in the datasheet. Please see Figure 5 and
the Bill of Materials section.
Figure 2: Output Voltage selection jumpers J5. Nominal jumper position voltages from left to
right are: 3.29V, 2.48V, 1.2V and 1.0V. Jumper shown selects 1.20V output.
Do not
change jumper positions while the board is powered.
Please note: The loop compensation circuit for this version of evaluation board
has been chosen for a wide range of PVIN and V
OUT
values. In order to optimize
the loop for any specific PVIN/V
OUT
operating point, please see the compensation
table in the datasheet. See Figures 4 and 5.
STEP 6:
Apply AVIN first, and then 12V
IN
if using dual supply mode. For single supply
mode, just apply 12V
IN
. The EN2340QI is now powered up since there is a resistor
divider from PVIN to Enable. Various measurements such as efficiency, line and load
regulation, input / output ripple, load transient, drop-out voltage measurements may be
conducted at this point. The over current trip level, short circuit protection, under voltage
lock out thresholds, temperature coefficient of the output voltage may also be measured
in this configuration.
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