2
Rev. 0
QUICK START PROCEDURE
DC2881A-A is easy to set up to evaluate the performance
of LTC7050 and LTC3884-1. Refer to Figure 2 for the
proper measurement equipment setup and follow the
procedure below.
1. With power off, connect the input power supply (7-14V)
to VIN (J1) and GND (J2).
2. Connect the 1.0V output load (Initial load: no load)
between VOUT1 (J5) and GND (J6).
3. Connect the 1.0V output load (Initial load: no load)
between VOUT2 (J3) and GND (J4).
4. Connect the DMMs to the input and outputs. Set default
jumper position:
• JP1: ON
• JP6: 1.5V
• JP7: ON
• JP9: ON
• JP19: ON
• JP20: ON
The dual outputs can be configured to run separately or
together as a single output. The dynamic load is con-
nected to channel 1 by default. It can be connected to
channel 2 by changing R196 and R197. Refer to page 1
of schematic for more details.
• SW1 RUN1: ON
• SW2 RUN2: ON
5. Turn on the input power supply and check for the
proper output voltages. V
OUT1
should be 1V ±0.5%
and V
OUT2
should be 1V ±0.5%.
6. Once the proper output voltages are established, adjust
the loads within the operating range and observe the
output voltage regulation, ripple voltage and other
parameters.
7. Connect the dongle and control the output voltages
from the GUI. See LTpowerPlay Quick Start Procedure
for details.
NOTE: When measuring the output or input voltage rip-
ple, do not use the long ground lead on the oscilloscope
probe. See Figure 3 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.
When doing the load transient test, it is recommended
to use a function generator to generate a pulse (~3%
duty cycle with 10Hz~100Hz frequency). Then applying
this pulse to the EXT PULSE (E7) and GND (E8) turrets.
100mV/A is the ratio of the pulse voltage amplitude over
OUTPUT AND ONBOARD E-LOAD CONFIGURATION
PERFORMANCE SUMMARY
Specifications are at T
A
= 25°C
PARAMETER
CONDITION
MIN
TYP
MAX
UNITS
Input Voltage Range
7
12
14
V
Output Voltage, V
OUT1/2
V
IN
= 7 to 14V, I
OUT1/2
= 0A to 30A
0.6
1
1.8
V
Maximum Output Current, I
OUT1/2
V
IN
= 7 to 14V, V
OUT1/2
= 0.6V to 1.8V
30
A
Typical Efficiency of V
OUT1/2
V
IN
= 12V, V
OUT1/2
= 1V, I
OUT1/2
= 30A
89.5
%
Default Switching Frequency
500
kHz
