Linear ANALOG DEVICES DC2155A-A, Manual

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1
DEMO MANUAL
DC2155A-A/DC2155A-B
Rev. C
DESCRIPTION
LTC3886/LTC3870
60V Dual Output Step-Down DC/DC Controller
with Digital Power System Management
Demonstration circuit 2155A is available in two configura-
tions. The DC2155A-A is a dual output synchronous step-
down converter featuring the LTC
®
3886 , a dual-phase
current mode controller. The DC2155A-B is a single output
synchronous step-down converter that operates with four
phases: two from the LTC3886 and two from LTC3870,
a phase extender. Both versions have a PMBus interface
and digital power system management functions.
The DC2155A uses discrete MOSFETs in the power stage.
The input range of this board is from 18V to 54V. The out-
put voltage can be programmed from 5V to 12V with an
output current of up to 12A per phase. For the DC2155A-A
version, the factory default setting for the CH0 output is
12V and CH1 output is 5V. In addition, this demo board
has an on-board dynamic load circuit, which makes it easy
to evaluate the transient performances.
The DC2155A powers up to default settings and produces
power based on configuration resistors or its program file
loaded within its onboard EEPROM without the need for
any serial bus communication. This allows easy evaluation
PERFORMANCE SUMMARY
of the DC/DC converter aspects of the LTC3886. To fully
explore the extensive power system management features
of the parts, download the GUI software LTpowerPlay
®
onto your PC and use LTC’s 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 Software Download
The software can be downloaded from:
LTpowerPlay
For more details and instructions of LTpowerPlay, please
visit Help menu in LTpowerPlay.
Design files for this circuit board are available .
Specifications are at T
A
= 25°C
DC2155A-A Assembly (Dual Output, LTC3886 Only)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Supply Range 18 32 54 V
FSW Factory Default Switching Frequency 150 kHz
V
OUT0
CH0 Factory Default Output Voltage I
OUT0
= 0A to 12A, V
IN
= 18V to 54V 12 V
I
OUT0
CH0 Output Current Range 0 12 A
EFF CH0 Efficiency V
OUT0
= 12V, V
IN
= 32V, I
OUT
= 12A, See Figure 6a 96.2 %
V
OUT1
CH1 Factory Default Output Voltage I
OUT1
= 0A to 12A, V
IN
= 18V to 54V 5 V
I
OUT1
CH1 Output Current Range 0 12 A
EFF CH1 Efficiency V
OUT1
= 5V, V
IN
= 32V, I
OUT
= 12A, See Figure 6b 93.6 %
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