Texas Instruments Evaluation Module for Lead Acid, switchmode BQ2031 DV2031S2 DV2031S2 데이터 시트
제품 코드
DV2031S2
Connection Descriptions
TB1
DC+
Charger supply (DC) 30V MAX
DC–
Ground from charger supply and low
side of system load
TB2
BAT+
Positive battery terminal
BAT–
Negative battery terminal
TEM–
Thermistor connection (negative)
TEM+
Thermistor connection (positive)
JP1 QSEL
Charge algorithm select
JP2 DSEL
Display mode select
JP3 TSEL
Charge algorithm select
JP4 IGSEL
Minimum current select
JP5
Number of cells
Fixed Configuration
The DV2031S2 board has the following fixed character-
istics:
V
CC
for the fast charge IC is regulated on-board
from the supply at connector TB1. TB1 can accept a
maximum of 30VDC. The minimum charging volt-
age for two cells is 10VDC, and the minimum
charging voltage for six cells is 22VDC.
LED1 and LED2 indicate charge status.
LED3 indicates a charge-pending or fault condition.
Charge begins on the later application of
1.
The battery
2.
Supply voltage
The onboard regulator supplies a fast charge cur-
rent I
MAX
of 2.5A. The fast (bulk) charge voltage
V
BLK
is set at 2.45V per cell (
±
1%) and the float
voltage V
FLT
is set at 2.25V per cell (
±
1%)
The number of cells can be changed within
board-defined parameters, as described below in
“Jumper-Selectable Configuration.”
The switching frequency of the PWM control is
100kHz.
The regulated current is controlled by the value of
the sense resistor R
SNS
according to the equation
I
V
R
CHG
SNS
=
0 25
.
The value of R
SNS
(R20 in the schematic) at ship-
ment is 0.10
Ω
. This resistor can be changed de-
pending on the application. The suggested maxi-
mum charging current I
MAX
for the bq2031S1
board is 2.5A with an accuracy of
±
10%.
The thermistor provided is the Philips
2322–640–63103. With this thermistor connected
between TEM+ and TEM–, the temperature fault
limits are V
LTF
(low temperature fault) = 0°C, V
HTF
(high temperature fault) = 45°C, and V
TCO
(charge
cutoff) = 47°C.
Jumper-Selectable
Configuration
Configuration
The DV2031S2 must be configured as follows:
DSEL (JP2) selects the LED display options as de-
scribed in Table 1 on the following page.
TSEL (JP3) and QSEL (JP1) select the charge algo-
rithm as shown in Table 2 on the following page.
IGSEL (JP4) sets I
MIN
and the Two-Step Current
maintenance charge as a ratio of I
MAX
. I
COND
=
I
MAX
/5, as shown below:
JP4
I
MIN
Fixed-Pulse
Average Current
L
I
MAX
10
I
I
COND
MAX
2
10
=
H
I
MAX
20
I
I
COND
MAX
4
20
=
None
I
MAX
30
I
I
COND
MAX
8
30
=
As indicated in the Jumper Configuration Diagram,
JP5 configures the board for the number of
lead-acid cells.
2
DV2031S2
Rev. B Board