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dc2055afa
DEMO MANUAL DC2055A
QUICK START PROCEDURE
Demonstration circuit 2055A is easy to set up to evaluate
the performance of the LTC3875EUJ. Refer to Figure 1 for
the proper measurement equipment setup and follow the
procedure below:
1. With power off, connect the input power supply to VIN
(4.5V-14V) and GND (input return).
2. Connect the 1.0V output load between VOUT1 and GND
(Initial load: no load).
3. Connect the DVMs to the input and outputs. Set default
jumper position:
4. Turn on the input power supply and check for the proper
output voltages. V
OUT1
should be 1.0V ±2%.
5. Once the proper output voltages are established, ad-
just the loads within the operating range and observe
the output voltage regulation, ripple voltage and other
parameters.
Note: When measuring the output or input voltage ripple,
do not use the long ground lead on the oscilloscope probe.
See Figure 2 for the proper scope probe technique. Short,
stiff leads need to be soldered to the (+) and (–) terminals
of an output capacitor. The probe’s ground ring needs to
touch the (–) lead and the probe tip needs to touch the
(+) lead.
JP1
JP2
JP3
JP4
JP5
JP6
SW1
SW2
MODE
PHASMD1
ENTMPB1
ENTMPB1
BIAS
PHASMD1
RUN1
RUN2
CCM
90°
OFF
OFF
OFF
90°
ON
ON
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