Analog Devices DC2958A Demo Manual page 4

DEMO MANUAL DC2958A
QUICK START PROCEDURE
DC2958A is easy to set up to evaluate the performance of
the LT8609A/09A-5/LT8609A/09A-3.3. Refer to Figure 5
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 6 for the proper
scope technique.
1. Set an input power supply that is capable of 42V/3A.
Then turn off the supply.
2. With power off, connect the supply to the input termi-
nals V and GND.
IN
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. Turn off the power
at the input.
4
5. Once the proper output voltage is established, connect
a variable load capable of sinking 3A to the output ter-
minals V and GND. Set the current for 0A.
OUT
a. If efficiency measurements are desired, an amme-
ter can be put in series with the output load in order
to measure the DC2958A'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 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.
8. An external clock can be added to the SYNC termi-
nal when SYNC function is used (JP1 on the SYNC
position). Please ensure that the chosen RT sets the
LT8609A/09A-5/09A-3.3 switching frequency to equal
or below the lowest SYNC frequency. See the data
sheet section, "Synchronization."
Rev. 0