Board Photo; Quick Start Procedure - Linear Technology DC2154A Demo Manual

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DEMO MANUAL DC2154A

BOARD PHOTO

QUICK START PROCEDURE

To use DC2154A to evaluate the performance of the
LTM8056, refer to Figure 1 for the proper measurement
equipment setup, Figure 2 for the maximum output current
versus input voltage and then follow the procedure below:
NOTE: Do not hot-plug the V
voltages. The absolute maximum voltage on V
and hot-plugging a power supply through wire leads to
the demonstration circuit can cause the voltage on the
extremely low ESR ceramic input capacitor to ring to
twice its DC value. In order to protect the LTM8056, an
aluminum electrolytic capacitor with higher ESR is placed
at the input terminals. This may protect against some, but
not all, input transients due to a hot-plugged power supply.
See Application Note 88 for more details.
NOTE: When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output voltage
ripple by touching the probe tip directly to terminals across
2
terminal at high input
IN
is 60V
IN
the V
or V
capacitors. See Figure 3 for proper scope
IN
OUT
probe technique. Solder terminals near the input or output
capacitors, if necessary.
1. Connect the RUN terminal to ground with a clip-on lead.
Connect the power supply (with power off), load, and
meters as shown in Figure 1.
2. After all connections are made, turn on the input power
and verify that the input voltage is between 7V and 58V.
3. Remove the clip-on lead from RUN. Verify that V
is 24V.
NOTE: If V
is too low, temporarily disconnect the load
OUT
to make sure that the load is not set too high.
Once the proper output voltage is established, adjust the
input voltage and load within the operating range and
observe the output voltage regulation, ripple voltage, ef-
ficiency and other parameters.
OUT
dc2154af

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