2
dc2564af
DEMO MANUAL DC2564A
QUICK START PROCEDURE
DC2564A is easy to set up to evaluate the performance
of the LT8606. Refer to Figure 4 for proper 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 Figure 5 for the proper scope
technique.
1. Set an input power supply that is capable of 42V/0.35A.
Then turn off the supply.
2. With power off, connect the supply to the input terminals
V
IN
and GND.
3. Turn on the power at the input.
NOTE: Make sure that the input voltage never exceeds
42V.
4. Check for the proper output voltage of 5V. Turn off the
power at the input.
5. Once the proper output voltage is established, connect
a variable load capable of sinking 0.35A at 5V to the
output terminals V
OUT
and GND. Set the current for 0A.
a. If efficiency measurements are desired, an ammeter
can be put in series with the output load in order
to measure the DC2564A’s output current.
b. A voltmeter can be placed across the output ter-
minals 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 established again,
adjust the load and/or input within the operating range
and observe the output voltage regulation, ripple volt-
age, efficiency and other desired parameters.
8. An external clock can be added to the SYNC terminal
when SYNC function is used (JP1 on the SYNC posi-
tion). Please ensure that the chosen RT sets the LT8606
switching frequency to equal or below the lowest SYNC
frequency. See the data sheet section, Synchronization.
Figure 1. Efficiency vs Load Current at 2MHz Switching Frequency
I
OUT
(A)
0
EFFICIENCY (%)
100
55
95
85
75
65
90
80
70
60
50
0.10
0.30
0.20
dn2564 F01
0.35
0.05
0.25
0.15
12V
IN
24V
IN
