Performance Summary; Quick Start Procedure - Linear Technology DC1811A Demo Manual

DEMO MANUAL DC1811A

PERFORMANCE SUMMARY

PARAMETER
Input Voltage Range
Output Voltage, V
OUT0
Maximum Output Current, I
OUT0
Output Voltage, V
OUT1
Maximum Output Current, I
OUT1
Typical Efficiency
Default Switching Frequency

QUICK START PROCEDURE

Table 1. LTM4676 Demo Cards for Up to 130A Point-of-Load Regulation
MAXIMUM OUTPUT CURRENT
13A, 13A
26A
50A
75A
100A
100A
130A
Demonstration circuit 1811A is easy to set up to evaluate
the performance of the LTM4676. 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 VIN
(4.5V to 26.5V) and GND (input return).
2. Connect the 1.0V output load between VOUT0 and GND
(Initial load: no load).
3. Connect the 1.8V output load between VOUT1 and GND
(Initial load: no load).
4. Connect the DVMs to the input and outputs. Set default
jumper position: JP1: ON; JP2: ON.
5. Turn on the input power supply and check for the proper
output voltages. V
OUT0
should be 1.8 ±1%.
6. 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.
2
(T = 25°C)
A
CONDITION
V = 4.5V to 26.5V, I
IN
V = 4.5V to 26.5V, V
IN
V = 4.5V to 26.5V, I
IN
V = 4.5V to 26.5V, V
IN
V = 12V, V
IN OUT
NUMBER OF OUTPUT VOLTAGES
2
1
1
1
1
1
1
should be 1.0V ±1 %, and V
= 0A to 13A
OUT0
= 0.5V to 4V
OUT
= 0A to 13A
OUT1
= 0.5V to 5.4V
OUT
= 1.8V, I = 13A
OUT
NUMBER OF LTM4676 µMODULE
REGULATORS ON THE BOARD
1
1
2
3
4
1 (+ 3x LTM4620A)
1 (+ 3x LTM4630)
7. Connect the dongle and control the output voltages
from the GUI. See "LTpowerPlay GUI for the LTM4676
Quick Start Guide" 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.
Connecting a PC to DC1811A
You can use a PC to reconfigure the power management
features of the LTM4676 such as: nominal V
set points, OV/UV limits, temperature fault limits, sequenc-
OUT1
ing parameters, the fault log, fault responses, GPIOs and
other functionality. The DC1613A dongle may be plugged
when V is present.
IN
VALUE
4.5V to 26.5V
0.5V to 4V, Default: 1V
13A
0.5V to 5.4V, Default: 1.8V
13A
86.3%
500kHz
DEMO BOARD NUMBER
DC1811A
DC2087A
DC1989A-A
DC1989A-B
DC1989A-C
DC2106A-A
DC2106A-B
, margin
OUT
dc1811afb