Linear ANALOG DEVICES DC1590B Demo Manual

DESCRIPTION
Demonstration circuit 1590B is a dual output synchro-
nous buck converter featuring the
output peak current mode controller with digital power
system management. There are two versions of the board
available:
• DC1590B-A: Senses the output current across a sense
resistor and has a default switching frequency of
350kHz.
• DC1590B-B: Senses output current with the inductor
DCR and has a default switching frequency of 425kHz.
Either version can be populated with the LTC3880EUJ-1,
instead of the LTC3880EUJ, which allows the user to pro-
vide bias power to the IC from an external power supply.
These boards provide two programmable outputs of 20A
each. The factory default settings are 1.8V for each output.
Both boards power up to default settings and produce
power based on configuration resistors without the need
for any serial bus communication. This allows easy evalu-
PERFORMANCE SUMMARY
SYMBOL PARAMETER
V Input Supply Range
IN
V Adjustable Output Voltage Range
OUT_0
I Output Current Range
OUT_0
V Adjustable Output Voltage Range
OUT_1
I Output Current Range
OUT_1
f Factory Default Switching Freq-A (R
SW-A
f Factory Default Switching Freq-B (DCR)
SW-B
EFF Peak Efficiency
Arrow.com.
Downloaded from
ation of the DC/DC converter. To fully explore the extensive
LTC 3880EUJ, a dual digital power management features of the part, download
®
the GUI software LTpowerPlay™ onto your PC and use
LTC's I
the board. LTpowerPlay allows the user to reconfigure the
part on the fly and store the configuration in EEPROM,
view telemetry of voltage, current, temperature and fault
status.
GUI Download
The software can be downloaded from:
For more details and instructions of LTpowerPlay, please
refer to LTpowerPlay GUI for LTC3880 Quick Start Guide.
Design files for this circuit board are available.
All registered trademarks and trademarks are the property of their respective owners.
(T = 25°C)
A
CONDITIONS
I = 0A to 20A, V
OUT1
I = 0A to 20A, V
OUT1
)
SENSE
V = 1.8V, See Figures 6 and 7
OUT
DEMO MANUAL DC1590B
LTC3880: Dual Output
Step-Down DC/DC
Controller with Digital
Power Management
2
C/SMBus/PMBus dongle DC1613A to connect to
http://www.analog.com/en/design-center/ltpower-play
= 6.5V to 24V
IN
= 6.5V to 24V
IN
MIN TYP MAX UNITS
6.5 12 24
0.5 1.8 4.0
20
0.5 1.8 5.0
20
350 kHz
425 kHz
89.5 %
Rev. A
1
V
V
A
V
A