PI2007-EVAL2 Datasheet, PDF (6/9 Pages) Vicor Corporation – PI2007-EVAL2 12V/15A High Side Active ORing

Before initial power-up follow these steps to configure
the evaluation board for specific end application
requirement:
Note that PI2007 will not turn off the MOSFET unless it
senses current in the reverse direction through the
MOSFET. This means that if both input power source
are turned on and both MOSFET are in on condition,
then one off the power source is turned off, the
associated PI2007 will not turn off the MOSFET unless
the power source sinks current from the output when it
turns off and cause a reverse current in the MOSFET that
generates negative voltage equal or greater than 6mV.
2. Control Circuitry Bias:
PI2007 control circuitry and the gate driver for the
MOSFET are biased through the VC pin. An internal
regulator clamps VC pin voltage with respect to PG
pin (V_VC-PG) to 11.7V typically. In a 12V application
the input voltage can vary between 10V and 14V
which is higher than the VC clamp voltage. A bias
resistor between VC pin and input voltage is required
to accommodate VC clamp.
PI2007-EVAL2 has two options for the bias resistor. A
420Ω internal resistor connected between VC pin
and VR pin, or 430Ω 1% external resistor (R3 and R4).
R3 and R4 installed in PI2007-EVAL2. If the internal
resistor is desired for the test, remove R3 and R4,
and install 0Ω resistor (jumper) for R7 and R8 to
connect PI2007 VR pin to its input.
3. Hook Up of the Evaluation Board
3.1. Connect the positive terminal of PS1 power
supply to Vin1. Connect the ground terminal of
PS1 to its local Rtn. Set the power supply to
12V. Keep PS1 output disabled, off.
3.2. Connect the positive terminal of PS2 power
supply to Vin2. Connect the ground terminal of
PS2 to its local Rtn. Set the power supply to
12V. Keep PS2 output disabled, off.
3.3. Connect the logic power supply PS3 positive
terminal to VL1 and VL2. Connect the ground
terminal of this power supply to a Rtn terminal.
Set the power supply to the desired logic
voltage level, 3.3V or 5V. Keep PS3 output
disabled, off.
3.4. Connect the electronic load to the output
between Vout and its local Rtn. Set the load
current to 5A.
3.5. Enable (turn on) PS1 power supply output.
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3.6. Enable (turn on) PS3 power supply output.
3.7. Turn on the electronic load.
3.8. Verify that the load voltage (Vout) is few
millivolts below 12V. This verifies that the Q1
MOSFET is in conduction mode.
3.9. Verify that Vin2 is low. This verifies that Q2
MOSFET is off.
3.10. Enable (turn on) PS2 output.
3.11. Verify that both PS1 and PS2 are sharing load
current evenly by looking at the supply current.
Power supplies output may need adjustment to
set current sharing between the supplies.
3.12. Disable (turn off) PS1, PS2, and PS3 outputs.
3.13. Enable (turn on) PS2 output then Enable and PS3
outputs.
3.14. Verify that Vout is few millivolts below 12V. This
verifies that the MOSFET Q2 is in conduction
mode.
3.15. D2 should be off. This verifies that there is no
fault condition.
3.16. Verify that Vin1 is low. This verifies that the
MOSFET (Q1) is off.
4. Input short circuit test:
PI2007 has a very fast response (80ns) to a reverse current
(Input short) fault condition. Measuring a short period
event requires attention to the test set-up. Before
proceeding, consider the following:
4.1. To emulate a real application, the BUS supplies
for this test should have a solid output source
such as a DC-DC converter that supplies high
current and can be connected very close to the
evaluation board to reduce stray parasitic
inductance. Or use the prospective supply
sources of the end application where the PI2007
will be used. Typical bench power supplies have
slow response to output load change. In this test
when the power supply output is shorted and
then released, the bench power supply may
produce high output voltage with high current
capability that may damage the device under
test.
4.2. Do not install Input capacitors (C1 and/or C2) in
this test.
4.3. Output capacitor (C7) should be installed.
4.4. Place the scope probes very close to the MOSFET
drain and source to measure Vout and Vin, and
PI2007-EVAL2 User Guide Rev. 1.1 Page 6 of 9