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dc1936afa
DEMO MANUAL DC1936A
QUICK START PROCEDURE
Demonstration circuit 1936A makes it easy to set up
to evaluate the performances of the LTC3882. Refer to
Figure 2 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. Measure the output voltage ripple by
touching the probe tip directly across the C10/C45. See
Figure 3 for proper scope probe technique.
1. Make sure jumpers are in the following positions:
JUMPER
POSITION
FUNCTION
JP1
C
GPIO0B to GPIO1B
JP2
NC
RUN0 to RUN1
JP3
ON
5V Bias for DrMOS
JP4
ON
Bias Supply for V
CC
of the LTC3882
JP5
OFF
Write Protection
2. With power off, connect the input power supply to V
IN
and GND. Connect active load to the output.
3. Make sure RUN switch (SW3 and SW4) is OFF.
4. Turn on the power at the input.
NOTE. Make sure that the input voltage does not
exceed 16V.
5. Turn on RUN switch as desired.
6. Check for the correct output voltage from E6 to E7 for
CH0 and from E8 to E9 for CH1. V
OUT
= 1V ± 0.5%
(0.995V ~ 1.005V)
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, adjust
the loads within the operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
8. Connect the dongle and control the output voltages
from the GUI. See LTpowerPlay QUICK START session
for details.
Connecting a PC to DC1936A
You can use a PC to reconfigure the power management
features of the LTC3882 such as: nominal V
OUT
, margin
set points, OV/UV limits, temperature fault limits, sequenc-
ing parameters, the fault log, fault responses, GPIO and
other functionality. The DC1613A dongle may be plugged
in regardless of whether or not V
IN
is present. Dongle can
be hot-plugged.
Figure 1. Demo Setup with PC
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