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EV1320QI Evaluation Board User Guide
February 2012
Page 2 of 6
Quick Start Guide
Figure 2: J2 allows control of the Enable pin.
The jumper on Enable pin as shown in Figure 2 is in disable mode. When jumper
is between the middle and right pins the signal pin is connected to ground or logic
low. When the jumper is between the left and middle pins, the signal pin is
connected to AVIN or logic High.
WARNING: complete steps 1 through 4 before applying power to the EV1320QI
evaluation board.
STEP 1: Set the “ENA” jumper to the Disable Position. See Figure 2 above.
STEP 2: With the AVIN power supply off, connect it to the input connectors
AVIN (TP14) and PGND (TP16) as indicated in Figure 3 and set the
power supply to the desired voltage (3.3V nominal).
STEP 3: With the VDDQ power supply off, connect it to the input power
connectors VDDQ (TP12) and PGND (TP17) as indicated in Figure 3,
and set the power supply to the desired voltage (1.2V−1.8V).
CAUTION: Be mindful of the polarity and magnitude. This evaluation
board has no reverse polarity or voltage clamping protection on it.
STEP 4: Connect the load to the output connectors VOUT (TP13) and PGND
(TP15), as indicated in Figure 3.
STEP 5: Power up the board by turning on the AVIN power supply first and then
the VDDQ supply. Next, move the ENA jumper to the enabled position.
The EV1320QI is now powered up and VOUT should be half of VDDQ.
You can now make Efficiency, Ripple, Line/Load Regulation, Load
transient, Power OK, and temperature related measurements.
STEP 6: Power Up/Down Behavior – Remove ENA jumper and connect a pulse
generator (output disabled) signal to the middle pin of ENA and
Ground. Set the pulse amplitude to swing from 0 to 2.5 volts. Set the
pulse period to 10msec, duty cycle to 50% and fast transition (<1usec.)
Hook up oscilloscope probes to ENA, POK and VOUT with clean ground
VIN
SIDE
GND
SIDE
Jumper