Quick Start Procedure - Analog Devices EVAL-LT7170-1-AZ User Manual

Evaluation Board User Guide

Quick Start Procedure

The EVAL-LT7170-1-AZ is easy to set up to evaluate the performance of the LT7170-1. See
measurement 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. Once the proper output voltage is established, connect variable loads capable of sinking 20A at 1.0V to the output
terminals V and GND. Set the current to 0A.
OUT
a. If efficiency measurements are desired, ammeters can be put in series with the output load to measure the EVAL-
LT7170-1-AZ's output current and in series with the power supply to measure the input current.
b. Voltmeters can be placed across the output terminals (VSENSE+, VSENSE-) to get accurate output voltage
measurements.
c. Voltmeters can be placed across the input terminals (VIN_SENSE, GND) to get accurate input voltage
measurements.
d. To achieve the best efficiency and accuracy, remove R11/R16 and populate R21/R22 only on the bottom layer
of the board.
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 LT7170-1 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.
See Figure 2 for the proper scope probe 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.
Connecting a PC to EVAL-LT7170-1-AZ
Use a PC to reconfigure the power management features of the LT7170-1, such as V
frequency, OV/UV limits, control loop compensation, temperature fault limits, sequencing parameters, the fault log, fault
responses, and other functionalities. The DC1613A dongle may be plugged in when a V
demo setup of connecting a PC to EVAL-LT7170-1-AZ.
analog.com
Figure 2 for the proper scope technique.
EVAL-LT7170-1-AZ
Figure 1
, current limit, switching
OUT
is present.
IN
for proper
Figure 3 shows a
Rev. A 2 of 13