Setup And Operation - Analog Devices EVAL-LT7171-1-AZ User Manual

Evaluation Board User Guide

Setup and Operation

The EVAL-LT7171-1-AZ is easy to set up to evaluate the performance of the LT7171-1.
equipment setup, and follow the procedure below:
NOTE: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the
oscilloscope probe. See
1. Set an input power supply that is capable of 16V/10A. Then turn off the supply.
2. With power off, connect the supply to the input terminals VEMI and GND. Set the default jumper position: SW1: ON.
3. Turn on the power at the input.
NOTE: Make sure that the input voltage never exceeds 16V.
4. Check for the proper output voltages of 1.0V ±0.25% (0.997V~1.003V). Turn off the power at the input.
5. Connect variable loads capable of sinking 40A at 1.0V to the output terminals V
a. If efficiency measurements are desired, ammeters can be put in series with the output load to measure the EVAL-
LT7171-1-AZ's output current and in series with the power supply to measure the input current.
b. Voltmeters can be placed across the output sense turrets (VSENSE+, VSENSE-) to get accurate output voltage
measurements.
c. Voltmeters can be placed across the input sense turrets (VIN_SENSE, GND) to get accurate input voltage
measurements.
d. To achieve the best efficiency measurement accuracy, populate R58 and R59 only. To achieve the best output
voltage accuracy at the output terminal, populate R27 and R28 only.
6. Turn on the power at the input.
NOTE: If there is no output, temporarily disconnect the load to make sure that the load is not set too high.
7. Once the proper output voltages are established again, adjust the load and/or input within the operating range and
observe the output voltage regulation, ripple voltage, efficiency, and other desired parameters.
8. Connect the dongle and control the output voltages from the GUI. See the LTpowerPlay GUI for the LT7171-1 Quick
Start Guide for details.
NOTE: When measuring the output or input voltage ripple, do not use the long ground lead on the oscilloscope probe. J6
can be used for measuring output voltage ripple. If using a probe is desired, see
technique. Short, stiff leads need to be soldered to the (+) and (-) terminals of an output capacitor. The probe's ground
ring needs to touch the (-) lead, and the probe tip needs to touch the (+) lead.
NOTE: When evaluating a single IC, customers may remove the 0 ohm resistor connected to RUN and refer to the data
sheet to adjust configuration resistors or registers if needed.
Connecting a PC to EVAL-LT7171-1-AZ
Use a PC to reconfigure the power management features of the LT7171-1, such as V
frequency, OV/UV limits, temperature fault limits, sequencing parameters, the fault log, fault responses, and other
functionalities. The DC1613A dongle may be plugged in when a V
connecting a PC to EVAL-LT7171-1-AZ.
analog.com
Figure 2 for the proper scope technique.
EVAL-LT7171-1-AZ
Figure 1
and GND. Set the current to 0A.
OUT
Figure 2 for the proper scope probe
OUT
is present. Figure 3
IN
for proper measurement
, current limit, switching
shows a demo setup of
Rev. A 2 of 13