參數(shù)資料
型號(hào)： BQ2002EPS
英文描述： Silicon Bridge Rectifiers
中文描述： 電池管理
文件頁(yè)數(shù)： 7/16頁(yè)
文件大?。?/td> 118K
代理商： BQ2002EPS
programmed value of the maximum charge time divided
by 32.
hold-off period =maximum time - out
32
Top-Off and Pulse-Trickle Charge
An optional top-off charge is available for NiCd or NiMH
batteries. Top-off may be desirable on batteries that
have a tendency to terminate charge before reaching full
capacity. To enable this option, the capacitance value of
C
MTO
connected to pin RC (Figure 4) should be greater
than 0.13
μ
F, and the value of the resistor connected to
this pin should be less than 15k
. To disable top-off, the
capacitance value should be less than 0.07
μ
F. The toler-
ance of the capacitor needs to be taken into account in
component selection.
Once enabled, the top-off is performed over a period
equal to the maximum charge time at a rate of
116
that
of fast charge.
Following top-off, the bq2000T trickle-charges the bat-
tery by enabling the MOD to charge at a rate of once ev-
ery 1.0 second. The trickle pulse-width is user-selectable
and is set by the value of the resistor R
MTO
, which is on
pin RC. Figure 7 shows the relationship between the
trickle pulse-width and the value of R
MTO
. The typical
tolerance of the pulsewidth below 150k
is
±
10%.
During top-off and trickle-charge, the bq2000T monitors
battery voltage and temperature.
suspended if the battery voltage rises above the
maximum cell voltage (V
MCV
) or if the temperature
exceeds the high-temperature fault threshold (V
HTF
).
These functions are
Charge Current Control
The bq2000T controls the charge current through the
MOD output pin. The current-control circuit supports a
switching-current regulator with frequencies up to
500kHz. The bq2000T monitors charge current at the
SNS input by the voltage drop across a sense-resistor,
R
SNS
, in series with the battery pack. See Figure 9 for a
typical current-sensing circuit. R
SNS
is sized to provide
the desired fast-charge current (I
MAX
):
I
MAX
=0.05
R
SNS
If the voltage at the SNS pin is greater than V
SNSLO
or
less than V
SNSHI
, the bq2000T switches the MOD output
high to pass charge current to the battery. When the
SNS voltage is less than V
SNSLO
or greater than V
SNSHI
,
the bq2000T switches the MOD output low to shut off
charging current to the battery. Figure 8 shows a typical
multi-chemistry charge circuit.
Voltage Input
As shown in Figure 6, a resistor voltage-divider between
the battery pack’s positive terminal and V
SS
scales the
battery voltage measured at pin BAT.
For Li-Ion battery packs, the resistor values R
B1
and
R
B2
are calculated by the following equation:
R
R
B2
N
V
V
B1
CELL
MCV
=
1
where N is the number of cells in series and V
CELL
is the
manufacturer-specified charging voltage. The end-to-end
input impedance of this resistive divider network should
be at least 200k
and no more than 1M
.
7
bq2000T
1
2
4
6
8
10
50
100
150
200
250
2
3
4
20
40
60
P
R
MTO
—k
80
100
120
140
160
2000PNvB3.eps
Shows Tolerance
Figure 7. Relationship Between Trickle Pulse-Width and Value of R
MTO
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BQ2002ESN 功能描述:電池管理 NiCd/NiMH Gating Charge Mngmnt IC RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
BQ2002ESN 制造商:Texas Instruments 功能描述:Battery Management IC
BQ2002ESNG4 功能描述:電池管理 NiCd/NiMH Gating Charge Mngmnt IC RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
BQ2002ESNTR 功能描述:電池管理 NiCd/NiMH Gating Charge Mngmnt IC RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
BQ2002ESNTRG4 功能描述:電池管理 NiCd/NiMH Charge Controller RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
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