Linear Technology DC2015A Demo Manual page 2

DEMO MANUAL DC2015A
QUICK START PROCEDURE
Demonstration circuit 2015A is easy to set up to evaluate
the performance of the LT8310/LT8311. Refer to Figure 1
for proper measurement equipment setup and follow the
procedure below:
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 2.
1. Set an input power supply that is capable of 36V to
72V. Then turn off the supply.
2. Direct an airflow of 200LFM across the unit for sustained
operation at full load.
3. With power off, connect the supply to the input terminals
+V and –V .
IN IN
a. Input voltages lower than 36V can keep the converter
from turning on due to the undervoltage lockout
feature of the LT8310/LT8311.
b. If efficiency measurements are desired, an ammeter
capable of measuring 10ADC can be put in series with
the input supply in order to measure the DC2015A'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.
2
4. Turn on the power at the input.
Note. Make sure that the input voltage does not ex-
ceed 100V.
5. Check for the proper output voltage of 12V. Turn off
the power at the input.
6. Once the proper output voltages are established, con-
nect a variable load capable of sinking 12A at 12V to
the output terminals +V
for 0A.
a. If efficiency measurements are desired, an ammeter
or a resistor shunt that is capable of handling 12ADC
can be put in series with the output load in order to
measure the DC2015A's output current.
b. A voltmeter with a capability of measuring at least 12V
can be placed across the output terminals in order
to get an accurate output voltage measurement.
7. 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.
8. 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.
and –V . Set the current
OUT OUT
dc2015af