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Application Note 1067
Step 2: Connect load and measurement equipment
2a. Connect load for VDDQ channel and measurement
equipment
– Connect the positive terminal (+) of the electronic
load and the DVM to the VDDQ terminal J5.
Connect the negative terminal (-) of the electronic
load and the DVM to the GND terminal J7.
2b. Connect load for VTT channel and measurement
equipment
– Connect the positive terminal (+) of the electronic
load and the DVM to the VTT terminal J6. Connect
the negative terminal (-) of the electronic load and
the DVM to the GND terminal J9.
2c. Connect measurement equipment for VREF
– Connect the positive terminal (+) of a DVM to the
V_REF terminal J8. Connect the negative terminal
(-) of the DVM to the GND terminal J10.
Step 3: Set control jumper as illustrated in Table 1 on
page 4.
Step 4: Power up the EVAL board
4a. Take the adjustable 24VDC power supply that is
connected to the VIN terminals J2 and J3 and make
sure the output voltage is set to zero volts.
4b. Turn on the 24VDC power supply.
4c. While reading the DVM, increase the output voltage
of the 24VDC power supply to 5VDC.
4d. Turn on the 5VDC power supply, connected with
VCC.
4e. While reading the DVM, increase the output voltage
of the 5VDC power supply to 5VDC.
Step 5: Take initial measurements
(The LED should become red at this point)
5a. Install the EN1 shunt jumper JP3 for CH1 (VDDQ).
5b. Install the EN2 shunt jumper JP4 for CH2 (VTT).
5c. The last action will bring LED indictor from RED to
GREEN. And the PGOOD voltage on J11 should be
5V, equal to the VCC voltage.
5d. Read the DVM connected to the VDDQ
terminal J5. It should show a value between
2.450V-2.550V
5e. Read the DVM connected to the VTT
terminal J6. It should show a half the value of
VDDQ, between 1.225V-1.275V.
5f. Read the DVM connected to the V_REF terminal J8.
It should read half the value of VDDQ, between
1.225-1.275V.
NOTE: A 10 nF capacitor must be installed on to C21 position if JP4
is installed prior to JP3 to ensure proper start up. C21 is the soft start
capacitor for CH2, as shown in the schematics.
NOTE: Terminals J3 (EN1) and J4 (EN2) may be connected to a
pulse generator for controlled on/off operation and may be observed
with an oscilloscope. However, make sure the signal generator
enable voltage is no more than 5V VCC.
Step 6: Vary operating conditions
6a. Adjust the 24V VIN Power Supply between
5-24 VDC.
– The VDDQ and VTT DVM readings should stay at
the above reading range.
6b. Adjust the electronic load current level.
– The voltage readings on VDDQ, VTT, and V_REF
should be within the above reading range. The load
on VDDQ should be less than 5A with MOSFET
FDS6912 mounted in the original EVAL board
setup. The load on VTT should be less than 3A, and
the load on V_REF should be less than 10mA. A
resistor can be connected between J8 and J10 as a
load for V_REF. The resistor value should be
greater than 125 Ohm. If a larger current creating
MOSFET is used, the load on VDDQ can be higher
than 5A.
Step 7: Power off
7a. Turn off the VCC power supply
7b. Turn off the VIN power supply
5
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