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2024年3月19日发(作者：压力容器类别的划分)
DEMO MANUAL DC2570A
LTM4678
Dual 25A or Single 50A µModule Regulator with
Digital Power System Management,1× LTM4678, 50A
DESCRIPTION
Demonstration circuit 2570A is a dual output, high effi-
ciency, high density, µModule
®
regulator with 4.5V to 16V
input range. The output voltage is adjustable from 0.5V
to 33V and it can supply 50A maximum load current. The
demo board has a LTM
®
4678 µModule regulator, which is
a dual 25A or single 50A step-down regulator with digital
power system management. Please see LTM4678 data
sheet for more detailed information.
DC2570A powers up to default settings and produces
power based on configuration resistors without the
need for any serial bus communication. This allows
easy evaluation of the DC/DC converter. To fully explore
the extensive power system management features of the
part, download the GUI software LTpowerPlay
®
onto your
PC and use Analog Devices’ I
2
C/SMBus/PMBus dongle
DC1613A to connect to the board. LTpowerPlay allows
the user to reconfigure the part on-the-fly and store the
configuration in EEPROM, view telemetry of voltage, cur-
rent, temperature and fault status.
GUI Download
The software can be downloaded from: LTpowerPlay
For more details and instructions of LTpowerPlay, please
refer to LTpowerPlay GUI for LTM4678 Quick Start Guide.
Design files for this circuit board are available.
All registered trademarks and trademarks are the property of their respective owners.
Figure 1. Single-Output 50A LTM4678/DC2570A Demo Circuit
1
Rev. 0
DEMO MANUAL DC2570A
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage, V
OUT
Maximum Output Current, I
OUT
Typical Efficiency
Default Switching Frequency
V
IN
= 4.5V to 16V, I
OUT
= 0A to 50A
V
IN
= 4.5V to 16V, V
OUT
= 0.5V to 3.3V
V
IN
= 12V, V
OUT
= 1.0V, I
OUT
= 50A
Specifications are at T
A
= 25°C
CONDITIONSMIN
4.5
0.51.0
50
86
(See Figure 5)
500
TYPMAX
16
3.3
UNITS
V
V
A
%
kHz
QUICK START PROCEDURE
Table 1. LTM4678 Demo Boards for Up to 250A Point-of-Load Regulation
MAXIMUM OUTPUT CURRENT
25A
50A
100A
150A
200A
250A
NUMBER OF OUTPUTS
2
1
1
1
1
1
NUMBER OF LTM4676 µModule
REGULATORS ON THE BOARD
1
1
2
3
4
5
DEMO BOARD NUMBER
DC2552A
DC2570A
DC2638A-A
DC2638A-B
DC2638A-C
DC2638A-D
Demonstration circuit 2570A is easy to set up to evaluate
the performance of the LTM4678. 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
OUT
and GND
(initial load: no load).
3. Connect the DVMs to the input and output. Set default
jumper position: SW1: ON.
4. Turn on the input power supply and check for the
proper output voltages. V
OUT
should be 1.0V ±0.5%.
5. Once the proper output voltage is established, adjust the
load within the operating range and observe the output
voltage regulation, ripple voltage and other parameters.
6. Connect the dongle and control the output voltages
from the GUI. See LTpowerPlay GUI for the LTM4678
Quick Start Guide for details.
Note: When measuring the output or input voltage
ripple, do not use the long ground lead on the oscil-
loscope 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.
2
Rev. 0
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