Datasheet

Fixed Configuration
The DV2054S2 board has the following characteristics:
V
CC
for the fast-charge IC is regulated onboard
from the supply at connector J1.
J1 can accept a maximum of 25VDC.
LED indicates charge status.
Charge begins on the later application of
–
The battery
–
Supply voltage
The on-board regulator supplies a fast charge current
I
MAX
of 1.25A. The fast-charge voltage V
MAX
is set at
25°C.
The switching frequency of the PWM control loops is
120kHz.
The regulated current is controlled by the value of the
sense resistor R
SNS
according to the relationship
I
V
R
CHG
SNS
=
0250.
The value of R
SNS
(R17 in the schematic) at shipment is
0.200
Ω
. This resistor can be changed depending on the
application. The maximum charging current I
MAX
for
the DV2054S2 board is 1.25A.
The thermistor provided is a Philips 2322–640–63103.
With this thermistor connected between TEM+ and
BAT-, the temperature fault limits are V
LTF
(low-tem
-
perature fault) = 0°C, V
HTF
(high-temperature fault) =
45°C, and V
TCO
(charge cutoff) = 47°C.
Jumper-Selectable Configuration
The DV2054S2 can be configured as follows (see Jumber
Configuration Diagram for location of the jumbers):
JP1: Configures the display mode (DSEL).
JP2: Configures the board for the number of cells.
JP3: Sets the minimum current termination.
Setup Procedure
1. Connect the thermistor to TEM+ and BAT-.
2. Attach the battery pack to BAT+ andBAT-.
3. Connect the charging supply to J1.
The following table shows the minimum input require-
ment for a given number of cells.
The combined charging and system load should not ex
-
ceed the I
MAX
limit of 1.25A.
2
DV2054S2
JP3 I
MIN
[12]3
I
MAX
10
1[23]
I
MAX
20
123
I
MAX
30
JP2 Number of Cells
[12]345678
1
12[34]5678
2
1234[56]78
3
123456[78]
4
JP1 Display Mode
[12]3
Mode 1
1[23]
Mode 2
1 2 3 Mode 3
Number of Cells
Minimum Charger
Supply Input
1 8.5VDC
2 13VDC
3 19VDC
4 25VDC