Datasheet

EVM Setup
2-5
Description and Testing
2.3 EVM Setup
Proper operation of the EVM requires two 6-V/1-A power supplies, two
resistive loads, two voltage meters, and an oscilloscope.
Refer to the setup diagram in Figure 2–5 and follow these steps for hot-plug
testing:
1) With the input supplies disconnected from the unit under test, adjust the
input voltages to 3.3 volts and turn off the power supplies. Slide switches
SW1 and SW2 (on the SLVP196) to the Disable position.
2) Adjust the load currents to 0.075 A (or 44 Ω), and connect the loads to the
two output pins—one load connected from V
O
1 (pin 2 of J2) to ground (pin
4 of J2), and the other load from V
O
2 (pin 3 of J2) to ground (pin 4 of J2).
3) Connect the power supplies to the two input pins of the
SLVP196—connect one from V
I
1 (pin 1 of J1) to ground (pin 3 or 4 of J1),
and the other from V
I
2 (pin 2 of J1) to ground (pin 3 or 4 of J1). Then turn
the power supply on. Do not exceed an input voltage of 5.5 V or a load
current of 1 A (or 3.3 Ω) at any time while the unit under test is connected
to the input supply.
4) Slide switch SW1 and/or SW2 marked on the EVM (SLVP196) to the En-
able V
O
1 and Enable V
O
2 positions (as marked on the EVM), respectively.
5) Read the voltage from V
O
1 (pin 2 of J2) and V
O
2 (pin 3 of J2) to GND. The
values should be about 3.3 V. Otherwise, the board may have problems
or the testing may not be correct.
6) The preceding test procedure (numerals 1 through 5) can be repeated with
V
I
1=V
I
2 = 5 V. Note that the loads must be 0.075 A (67 Ω) at V
I
1 = V
I
2 =
5 V and the output voltages from V
O
1 (pin 2 of J2) and V
O
2 (pin 3 of J2)
must be about 5 V. Otherwise, the board may have problems or the testing
may not be correct.
7) The preceding test procedure (numerals 1 through 5) can be repeated with
two input voltages (V
I
1 = 3.3 V and V
I
2 = 5 V, or vice versa). Note that the
load currents must be less than 0.075 A for each channel and the output
voltages must be about V
O
1 = 3.3 V and V
O
2 = 5 V, or vice versa.
The load current limits for V
O
1 and V
O
2 are set to 1 A.