2
dc1830b-c/b-df
DEMO MANUAL
DC1830B-C/DC1830B-D
PERMORMANCE SUMMARY
QUICK START PROCEDURE
SYMBOL
PARAMETER
CONDITIONS/COMMENTS
MIN
TYP
MAX
UNITS
V
IN
Input Supply Range
This Is the Input Voltage of the Front-End DC/DC Supply
20
60
V
V
IN-MP
Input Regulation Voltage
This Is the Input Voltage Lower Limit Set by the LTC4000-1
35.1
V
V
FLOAT
Battery Float Voltage
14.4
14.6
14.8
V
Output Regulation
Line and Load (20V to 60V, 0A to 4.5A)
0
%
I
BAT
Battery Charge Current
5.0
A
Battery Charge Current – Trickle
0.6
A
t
T
Charge Termination Time
V
BAT
= V
FLOAT
2.9
Hours
V
OUT-SYS
System Output Voltage
12.3
14.6
15.5
V
I
OUT-SYS
System Output Current Range
0
5.5
A
Demonstration circuit 1830 is offered for use in com-
bination with a front-end DC/DC converter, and will need
to be customized to suit the intended application. It has
been supplied with components for a design as outlined
in the Performance Summary, and tested in conjunction
with the LTC3845A buck converter that it was tailored
to. A separate demonstration board is available for
the LTC4000-1/LTC3789 buck-boost combination, the
DC1721B. The LTC4000-1 data sheet should be used for
guidance in determining circuit values for the application
at hand. You may follow the Design Example on page 26 of
the data sheet. Table 1 provides a summary of parameter
adjustments.
NOTE: The PFETs supplied on this board are rated at 30V.
Once the circuit has been customized to suit the application
at hand, it is easy to set up to evaluate the performance of
the LTC4000-1 when combined with a suitable switching
power converter, such as the LTC3845A. Voltages and
currents cited in this procedure are for the design as de-
livered; if the design has been customized, substitute the
appropriate values. Refer to Figure 1 for proper measure-
ment equipment setup and follow the procedure below:
WARNING: BATTERIES ARE POTENTIALLY DANGEROUS
HIGH ENERGY SOURCES. IMPROPER CONNECTION,
OVERCHARGE, OR RAPID DISCHARGE COULD RESULT
IN EXPLOSION AND/OR FIRE.
1. Set an input power supply that is capable of 60V and
3A, to 36V. Then turn off the supply.
2. With power off, connect the supply to the input terminals
VIN and GND.
NOTE:
a. Input voltages lower than 20V can keep the converter
from turning on due to the undervoltage lockout
feature of the LTC4000-1.
b. Input voltages lower than the MPPC regulation point
(35.1V) will reduce the associated DC/DC converter’s
output to a minimum.
c. If efficiency measurements are desired, refer to Fig-
ure 1 for the test setup.
3. Set CHARGE jumper to ENABLE.
4. Turn on the power at the input.
NOTE: Make sure that the input voltage never exceeds
60V.
5. Check for the proper BAT output voltage of 14.6V. Turn
off the power at the input.
6. Now that the proper output voltage is established, con-
nect a variable load capable of sinking 6A at 16V to the
output terminals BAT and GND. Set the current for 0A.
7. Turn on the power at the input.
NOTE: If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
Specifications are at T
A
= 25°C