2
dc2066af
DEMO MANUAL DC2066A
Quick start proceDure
Table 2. LTM4677 Demo Boards for Up To 140A Point-of-Load Regulation
MAXIMUM OUTPUT CURRENT
NUMBER OF OUTPUTS
NUMBER OF LTM4676
µMODULE REGULATORS ON THE BOARD
DEMO BOARD NUMBER
Dual 18A
2
1
DC2066A
70A
1
2
DC2143A-A
105A
1
3
DC2143A-B
140A
1
4
DC2143A-C
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 GUI for the LTM4677
Quick Start Guide
” for details.
Note: When measuring the output or input voltage ripple,
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.
Demonstration circuit 2066A is easy to set up to evaluate
the performance of the LTM4677EY. Refer to Figure 2 for
the proper measurement equipment setup and follow the
procedure below.
1. With power off, connect the input power supply to V
IN
(4.5V to 16V) and GND (input return).
2. Connect the 1.0V output load between V
OUT0
and GND
(Initial load: no load).
3. Connect the 1.8V output load between V
OUT1
and GND
(Initial load: no load).
4. Connect the DVMs to the input and outputs. Set default
jumper position: SW1: ON; SW2: ON.
5. Turn on the input power supply and check for the proper
output voltages. V
OUT0
should be 1.0V ±1%, and V
OUT1
should be 1.8V ±1%.
performance summary
Table 1. Performance Summary (T
A
= 25°C)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage Range
4.5
16
V
Output Voltage, V
OUT0
V
IN
= 4.5V to 16V, I
OUT0
= 0A to 18A
0.5
1.8
V
Maximum Output Current, I
OUT0
V
IN
= 4.5V to 16V, V
OUT0
= 0.5V to 1.8V
18
A
Output Voltage, V
OUT1
V
IN
= 4.5V to 16V, I
OUT1
= 0A to 18A
0.5
1.8
V
Maximum Output Current, I
OUT1
V
IN
= 4.5V to 16V, V
OUT1
= 0.5V to 1.8V
18
A
Typical Efficiency
V
IN
= 12V, V
OUT1
= 1.8V, I
OUT1
= 18A
87.9
(See Figures 5 and 6)
%
Default Switching Frequency
500
kHz
