Quick Start Procedure - Linear Technology Analog Devices LTM4676A Demo Manual

DEMO MANUAL DC1811B-B
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
*For low duty cycle applications, it may approach minimum on the limit. The minimum on-time for LTM4676A is 45ns nominal, guardband to 90ns.

QUICK START PROCEDURE

Table 1. LTM4676/LTM4676A Demo Cards for Up to 130A Point-of-Load Regulation
MAXIMUM OUTPUT CURRENT
13A, 13A
13A, 13A
26A
50A
75A
100A
100A
130A
Demonstration circuit 1811B-B is easy to set up to evalu-
ate the performance of the LTM4676A. 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
(4.5V to 26.5V) and GND (input return).
2. Connect the 1.0V output load between V
(Initial load: no load).
3. Connect the 1.8V output load between V
(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
and V should be 1.8V ±0.5%.
OUT1
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.
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 = 1.8V, I
IN OUT
NUMBER OF OUTPUT VOLTAGES
2
2
1
1
1
1
1
1
and GND
OUT0
and GND
OUT1
should be 1.0V ±0.5 %,
OUT0
VALUE
4.5V to 26.5V
= 0A to 13A 0.5V to 5.5V (Minimum On)*, Default: 1V
OUT0
= 0.5V to 5.5V 13A
OUT
= 0A to 13A 0.5V to 5.5V (Minimum On)*, Default: 1.8V
OUT1
= 0.5V to 5.5V 13A
OUT
= 13A 86.3%
OUT
500kHz
NUMBER OF LTM4676/LTM4676A µMODULE
REGULATORS ON THE BOARD
1× LTM4676
1× LTM4676A
1× LTM4676
2× LTM4676
3× LTM4676
4× LTM4676
1× LTM4676 (+ 3× LTM4620A)
1× LTM4676 (+ 3× LTM4630)
7. Connect the dongle and control the output voltages
from the GUI. See "LTpowerPlay GUI for the LTM4676A
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
IN
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 DC1811B-B
You can use a PC to reconfigure the power management
features of the LTM4676A such as: nominal V
gin set points, OV/UV limits, temperature fault limits,
sequencing parameters, the fault log, fault responses,
GPIOs and other functionality. The DC1613A dongle may
be plugged when V
DEMO BOARD NUMBER
DC1811A/DC1811B-A
DC1811B-B
DC2087A
DC1989A-A
DC1989A-B
DC1989A-C
DC2106A-A
DC2106A-B
is present.
IN
, mar-
OUT
Rev. A