Quick Start Procedure - Linear Technology DC2434A Demo Manual

DEMO MANUAL DC2434A

Quick start proceDure

Demonstration circuit 2434 is easy to set up to evaluate
the performance of the LTC3864. 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 1.
1. Set an input power supply that is capable of 6V to 60V
to 13V. Then turn off the supply.
2. With power off, connect the supply to the input terminals
+V and GND.
IN
a. Input voltages lower than 6V can keep the converter
from turning on due to the undervoltage lockout
feature of the LTC3864.
b. If efficiency measurements are desired, an ammeter
capable of measuring 5A
be put in series with the input supply in order to
measure the DC2434A's input current.
c. A voltmeter with a capability of measuring at least
60V can be placed across the input terminals in order
to get an accurate input voltage measurement.
–
V
IN
+
I
IN
+
2
or a resistor shunt can
DC
–
V
IN
+
–
Figure 1. Proper Measurement Equipment Setup
3. Turn on the power at the input.
NOTE. Make sure that the input voltage never exceeds 60V.
4. Check for the proper output voltage of 12V. Turn off
the power at the input.
5. Once the proper output voltage is established, connect a
variable load capable of sinking 5A at 12V to the output
terminals +V and GND. Set the current for 0A.
OUT
a. If efficiency measurements are desired, an ammeter
or a resistor shunt that is capable of handling 5A
can be put in series with the output load in order to
measure the DC2434A'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.
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 and/or input within the operating range
and observe the output voltage regulation, ripple volt-
age, efficiency and other desired parameters.
DC2434 F01
–
–
LOAD
V
OUT
+
I
OUT
+
–
+
DC
dc2434af