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參數(shù)資料
| 型號： | BQ2007SS |
| 英文描述： | Silicon Bridge Rectifiers |
| 中文描述： | 電池管理 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 118K |
| 代理商： | BQ2007SS |
A NiCd or NiMH battery pack consisting of N se-
ries-cells may benefit by the selection of the R
B1
value to
be N-1 times larger than the R
B2
value.
In a mixed-chemistry design, a common voltage-divider
is used as long as the maximum charge voltage of the
nickel-based pack is below that of the Li-Ion pack. Oth-
erwise,different scaling is required.
Temperature Monitoring
The bq2000T measures the temperature by the voltage
at the TS pin. This voltage is typically generated by a
negative-temperature-coefficient thermistor. The
bq2000T compares this voltage against its internal
threshold voltages to determine if charging is safe.
These thresholds are the following:
High-temperature cutoff voltage: V
TCO
= 0.225
V
CC
This
voltage
corresponds
temperature (TCO) at which fast charging is allowed.
The bq2000T terminates fast charge if the voltage on
pin TS falls below V
TCO
.
to
the
maximum
High-temperature fault voltage: V
HTF
= 0.25
V
CC
This
voltage corresponds to the temperature (HTF) at which
fast charging is allowed to begin.
Low-temperature fault voltage: V
LTF
= 0.5
V
CC
This voltage corresponds to the minimum temperature
9
bq2000T
Parameter
Value
Maximum cell voltage (V
MCV
)
Minimum pre-charge qualification voltage (V
LBAT
)
High-temperature cutoff voltage (V
TCO
)
High-temperature fault voltage (V
HTF
)
Low-temperature fault voltage (V
LTF
)
bq2000T fast-charge maximum time out (MTO)
Fast-charge charging current (I
MAX
)
Hold-off period
Top-off charging current (optional)
Top-off period (optional)
Trickle-charge frequency
Trickle-charge pulse-width
2V
950mV
0.225
V
CC
0.25
V
CC
0.5
V
CC
R
MTO
C
MTO
35,988
0.05/R
SNS
MTO/32
I
MAX
/16
MTO
1Hz
See Figure 7
Table 2. Summary of NiCd or NiMH Charging Characteristics
Parameter
Value
Maximum cell voltage (V
MCV
)
Minimum pre-charge qualification voltage (V
LBAT
)
High-temperature cutoff voltage (V
TCO
)
High-temperature fault voltage (V
HTF
)
Low-temperature fault voltage (V
LTF
)
bq2000T fast-charge maximum time-out (MTO)
Fast-charge charging current (I
MAX)
Hold-off period
Minimum current (for fast-charge termination)
Trickle-charge frequency (before fast charge only)
Trickle-charge pulse-width (before fast charge only)
2V
950mV
0.225
V
CC
0.25
V
CC
0.5
V
CC
2
R
MTO
C
MTO
35,988
0.05/R
SNS
MTO/32
I
MAX
/14
1Hz
See Figure 7
Table 3. Summary of Li-Ion Charging Characteristics
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