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dc2050af
DEMO MANUAL DC2050A
QUICK START PROCEDURE
Note: When measuring the output voltage ripple, care must
be taken to avoid a long ground lead on the oscilloscope
probe. Measure the output voltage ripple by touching the
probe tip and ground ring directly across the last output
capacitor as shown in Figure 1.
1. Set an input power supply that is capable of 36V to
72V to 36V. Then turn off the supply.
2. With power off, connect the supply to the input terminals
+VIN and –VIN.
a. Input voltages lower than 36V can keep the converter
from turning on due to the undervoltage lockout
feature of the LT3753.
b. If efficiency measurements are desired, an ammeter
capable of measuring 5A DC can be put in series with
the input supply in order to measure the DC2050A’s
input current.
c. A voltmeter with a capability of measuring at least
72V can be placed across the input terminals in order
to get an accurate input voltage measurement.
3. Turn on the power at the input.
Note: Make sure that the input voltage does not exceed
100V.
4. Check for the proper output voltage of 5V. Turn off the
power at the input.
5. Once the proper output voltages are established, con-
nect a variable load capable of sinking 20A at 5V to the
output terVOUT and –VOUT. Set the current
for 0A.
a. If efficiency measurements are desired, an ammeter
or a resistor shunt that is capable of handling 20A
DC can be put in series with the output load in order
to measure the DC2050A’s output current.
b. A voltmeter can be placed across the output terminals
in order to get an accurate output voltage measure-
ment.
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 voltage is again established,
adjust the load within the operating range and observe
the output voltage regulation, ripple voltage, efficiency
and other desired parameters.