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DEMO MANUAL
DC2155A-A/DC2155A-B
PERFORMANCE SUMMARY
DC2155A-B Assembly (Four-Phase Single Output, LTC3886 and LTC3870)
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Factory Default Output Voltage
OUT0
I
Output Current Range
OUT0
FSW
Factory Default Switching Frequency
EFF
Efficiency
QUICK START PROCEDURE
Demonstration circuit 2155A makes it easy to set up
to evaluate the performances of the LTC3886. Refer to
Figure 1 and 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 for CH0
and C26 for CH1. See Figure 5 for proper scope probe
technique.
1. Make sure jumpers are in the following positions:
JUMPER POSITION
JP1
ON
JP2
NC for DC2155A-A;
C for DC2155A-B
JP3
NC for DC2155A-A;
C for DC2155A-B
JP5
INT
JP6
OFF
2. With power off, connect the input power supply to V
and GND. Connect active load to output.
2
Specifications are at T
CONDITIONS
I
= 0A TO 48A, V
OUT
V
= 32V, V
IN
FUNCTION
EXT 5V (on-board bias supply) for
EXTV
and dynamic load circuit
CC
FAULT0 to FAULT1
RUN0 to RUN1
External or on-board pulse generator
for transient circuit
On-board pulse generator ON/OFF
= 25°C
A
= 18V to 54V
IN
= 12V, I
= 48A, See Figure 7
OUT
OUT
3. Make sure both RUN switches (SW1, SW2) are OFF .
4. Turn on the power at the input.
NOTE. Make sure that the input voltage does not
exceed 54V.
5. Turn on both SW1 (for RUN0), and SW2 (for RUN1)
switches, as desired.
6. Check for the correct output voltage from E5 to E6
for CH0, E7 to E8 for CH1. For DC2155A–A version,
V
= 12.0V ± 0.5% (11.94V ~ 12.06V), V
OUT0
± 0.5% (4.975V ~ 5.025V). For DC2155A–B version,
V
= 12.0V ± 0.5% (11.94V ~ 12.06V).
OUT0
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 voltage from
the GUI. See "LTpowerPlay QUICK START" session for
details.
IN
MIN
TYP
MAX
18
32
54
12
0
48
150
96.9
OUT1
UNITS
V
V
A
kHz
%
= 5V
Rev. C
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