3
dc1830b-c/b-df
DEMO MANUAL
DC1830B-C/DC1830B-D
QUICK START PROCEDURE
8. Once the proper BAT output voltage is again es-
tablished, adjust the load and/or source within the
operating range and observe the battery float voltage
regulation, charge current, and other desired param-
eters.
9. Set the load to constant voltage mode to more easily
observe charge current and trickle charge current.
10. In order to observe MPPC operation, add a 4.7Ω or
5Ω, 10W resistor in series with the DC source and set
the source to 40V. Use a constant voltage or constant
resistance load characteristic. As the load is increased,
the input voltage will be regulated at the MPPC
regulation point (35.1V) by reducing the output of the
DC/DC converter.
NOTE: Operation in the instant-on region (V
OUT
<
12.5V) may engage thermal limit circuit to protect Q2
in the linear region.
NOTE: The optional thermal limit circuit for Q1 (Q5,
RNTC3, R8-R12, and U2) is included to protect Q1 in
case of an extended short circuit on VOUT-SYS under
adverse thermal conditions (T
A
> 40°C). It may not be
needed in applications with less severe thermal condi-
tions, lower current available to VOUT-SYS, or where
continuous short circuit protection on VOUT-SYS is
not required.
NOTE: The following applies to the DC1830B-C.
11. Turn off the power at the input.
12. Connect the output load and meters to the VOUT-SYS
output.
13. Set CHARGE jumper to DISABLE.
14. Turn on the power at the input.
15. Once the proper VOUT-SYS is again established, adjust
the load and/or source within the operating range and
observe the output voltage regulation, ripple voltage,
efficiency, output current limit and other desired
parameters.
Table 1. LTC4000-1 Charger Setup Parameters and Reference Values
REFERENCE DESCRIPTION
NOMINAL VALUE (V)*
MIN/MAX
CONDITIONS
V
IN
Input Voltage Regulation/Limit
1.000V
0.985/1.010
I
CL
Charge Current Regulation/Limit
(50μA • R
CL
)/20
45/55
50mV Max
I
CL
Trickle Charge Current Regulation/Limit
(50μA • R
CL
)/20
4.5/5.5
V
BAT-FLOAT
Battery Float Voltage
1.136V
1.125/1.147
V
OUT
System Voltage
1.193V
1.181/1.204
Charger Off
(Follows V
BAT
)
Charger Float
(Follows V
BAT
)
Charging at I
CL
, 0.86 • V
BAT-FLOAT
< V
BAT
< V
BAT-FLOAT
0.86 • 1.136V
0.82/0.90
Instant-On, 0.68 • V
BAT-FLOAT
< V
BAT
< 0.86 • V
BAT-FLOAT
0.86 • 1.136V
0.82/0.90
Instant-On, Trickle, V
BAT
< 0.68 • V
BAT-FLOAT
V
M
Input Voltage Monitor/UVLO
1.193V
1.181/1.204
Falling, (40mV Hysteresis)
CX
C/X Monitor/Charge Termination
(5μA • R
CX
– 10mV)/20
4.5/5.5
Short TMR to BIAS for C/X Termination
TMR
Charge Termination Timer
104s/nF
83/126
*Normalized to sense point.
