Linear Technology DC2312A-A Demo Manual

DESCRIPTION
Demonstration circuit 2312A is a high current, high
efficiency, dual phase synchronous buck converter
featuring the LTC3882EUJ-1, a dual output voltage
mode controller with the additional features of dif-
ferential V sense and dedicated PGOOD output on
OUT
both channels, compared to LTC3882. The LTC3882-1
has the PMBus interface and power system manage-
ment functions.
There are two versions of the boards available:
DC2312A-A: Dual phase dual output configuration. De-
n
fault output setting V
OUT0
DC2312A-B: Dual phase single output configuration.
n
Default output setting V
The DC2312A powers up to default settings and pro-
duces power based on configuration resistors or with
its nonvolatile memory without the need for any serial
bus communication. This allows easy evaluation of the
PERFORMANCE SUMMARY
SYMBOL PARAMETER
V Input Supply Range
IN
V Output Voltage Range (-A Version)
OUT0
I Output Current Range (-A Version)
OUT0
V Output Voltage Range (-A Version)
OUT1
I Output Current Range (-A Version)
OUT1
V Output Voltage Range (-B Version)
OUT0
I Output Current Range (-B Version)
OUT0
F Factory Default Switching (-A Version)
SW
F Factory Default Switching (-B Version)
SW
EFFICIENCY Full Load Efficiency (-A Version)
Full Load Efficiency (-B Version)
*Note: The DC2312A uses 2.5V-rated low ESR PosCAP (Part No. 2R5TPE470M7) as output capacitors for optimized load transient performance.
If > 2.0V V is needed, 4V or 6.3V-rated output capacitors should be used.
OUT
**Note: When continuously running at full load, forced air flow is needed.
with Power System Management
= 1.5V/35A, V = 1.0V/35A.
OUT1
= 1.0V/70A.
OUT0
Specifications are at T
CONDITIONS
I = 0A to 35A, V
OUT0
I = 0A to 35A, V
OUT1
I = 0A to 70A, V
OUT0
V = 1.5V, I
OUT0
V = 1.0V, I
OUT1
V = 1.0V, I
OUT0
DC2312A-A/DC2312A-B
LTC3882EUJ-1 High Efficiency
Step-Down DC/DC Converter
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 LTC's
2
I 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 settings within
its onboard EEPROM, along with viewing telemetry pa-
rameters that include voltage, current, temperature and
fault status.
GUI Software LTpowerPlay Download
The software can be downloaded from:
http://www.linear.com/LTpowerPlay
Design files for this circuit board are available at
http://www.linear.com/demo/DC2312A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
= 25°C
A
= 7V to 14V
IN
= 7V to 14V
IN
= 7V to 14V
IN
= 35A, See Figure 5
OUT0
= 35A, See Figure 5
OUT1
= 70A, See Figure 6
OUT0
DEMO MANUAL
MIN TYP MAX
7 12 14
0.5 1.5 2.0*
0 35**
0.5 1.0 2.0*
0 35**
0.5 1.0 2.0*
0 70**
500
450
90.6
88.0
87.8
UNITS
V
V
A
V
A
V
A
kHz
kHz
%
%
%
dc2312afb
1