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參數(shù)資料
| 型號： | ISL6292EVAL2 |
| 廠商： | Intersil Corporation |
| 英文描述： | Li-ion/Li Polymer Battery Charger |
| 中文描述： | Li-ion/Li聚合物電池充電器 |
| 文件頁數(shù)： | 14/19頁 |
| 文件大?。?/td> | 647K |
| 代理商： | ISL6292EVAL2 |
14
FN9105.6
July 25, 2005
Shutdown
The ISL6292 can be shutdown by pulling the EN pin to
ground. When shut down, the charger draws typically less
than 30
μ
A current from the input power and the 2.8V output
at the V2P8 pin is also turned off. The EN pin needs be
driven with an open-drain or open-collector logic output, so
that the EN pin is floating when the charger is enabled.
Input and Output Capacitor Selection
Typically any type of capacitors can be used for the input
and the output. Use of a 0.47
μ
F or higher value ceramic
capacitor for the input is recommended. When the battery is
attached to the charger, the output capacitor can be any
ceramic type with the value higher than 0.1
μ
F. However, if
there is a chance the charger will be used as an LDO linear
regulator, a 10
μ
F tantalum capacitor is recommended.
Current-Limited Adapter
Figure 24 shows the ideal current-voltage characteristics of
a current-limited adapter. V
NL
is the no-load adapter output
voltage and V
FL
is the full load voltage at the current limit
I
LIM
. Before its output current reaches the limit I
LIM
, the
adapter presents the characteristics of a voltage source. The
slope r
O
represents the output resistance of the voltage
supply. For a well regulated supply, the output resistance
can be very small, but some adapters naturally have a
certain amount of output resistance.
The adapter is equivalent to a current source when running
in the constant-current region. Being a current source, its
output voltage is dependent on the load, which, in this case,
is the charger and the battery. As the battery is being
charged, the adapter output rises from a lower voltage in the
current-voltage characteristics curve, such as point A, to
higher voltage until reaching the breaking point B, as shown
in Figure 24.
The adapter is equivalent to a voltage source with output
resistance when running in the constant-voltage region;
because of this characteristic. As the charge current drops,
the adapter output moves from point B to point C, shown in
Figure 24.
The battery pack can be approximated as an ideal cell with a
lumped-sum resistance in series, also shown in Figure 24.
The ISL6292 charger sits between the adapter and the
battery.
Working with Current-Limited Adapter
As described earlier, the ISL6292 minimizes the thermal
dissipation when running off a current-limited ac adapter, as
shown in Figure 18. The thermal dissipation can be further
reduced when the adapter is properly designed. The
following demonstrates that the thermal dissipation can be
minimized if the adapter output reaches the full-load output
voltage (point B in Figure 24) before the battery pack voltage
reaches the final charge voltage (4.1V or 4.2V). The
assumptions for the following discussion are: the adapter
current limit = 750mA, the battery pack equivalent
resistance = 200m
, and the charger ON resistance is
350m
.
TABLE 2. STATUS INDICATIONS
FAULT STATUS
INDICATION
High
High
Charge completed with no fault (Inhibit) or
Standby
High
Low
Charging in one of the three modes
Low
High
Fault
*Both outputs are pulled up with external resistors.
FIGURE 24. THE IDEAL I-V CHARACTERISTICS OF A
CURRENT LIMITED ADAPTER
V
NL
V
FL
I
LIM
r
O
V
NL
I
LIM
r
O
=(V
NL
- V
FL
)/I
LIM
V
PACK
V
CELL
R
PACK
A
B
C
(A) THE EQUIVALENT CIRCUIT IN THE
CONSTANT CURRENT REGION
(C) THE EQUIVALENT CIRCUIT WHEN THE
PACK VOLTAGE REACHES THE FINAL
CHARGE VOLTAGE
V
ADAPTER
V
PACK
V
CELL
R
DS(ON)
R
PACK
Charger
I
Adapter
I
LIM
Battery
Pack
(B) THE EQUIVALENT CIRCUIT IN THE
RESISTANCE-LIMIT REGION
V
ADAPTER
V
PACK
V
CELL
R
PACK
Charger
I
r
O
Adapter
V
NL
Battery
Pack
R
DS(ON)
V
ADAPTER
V
PACK
V
CELL
R
PACK
Charger
I
r
O
Adapter
V
NL
Battery
Pack
4.2V DC
Output
FIGURE 25. THE EQUIVALENT CIRCUIT OF THE CHARGING SYSTEM WORKING WITH CURRENT LIMITED ADAPTERS
ISL6292
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6292-1CR4Z-T | Li-ion/Li Polymer Battery Charger |
| ISL6292-2CR4Z-T | Li-ion/Li Polymer Battery Charger |
| ISL6292BCRZ-T | ECONOLINE: REZ - Cost Effective- 1kVDC & 2kVDC Isolation- Custom Solutions Available- No Extern. Components Required- UL94V-0 Package Material- Efficiency to 85% |
| ISL6292BCR-T | Li-ion/Li Polymer Battery Charger |
| ISL6292B | Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear and Preset 14-SSOP -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6292EVAL2Z | 功能描述:EVALUATION BOARD FOR ISL6292 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 標(biāo)準包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| ISL6293 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Li-ion/Li Polymer Battery Charger Accepting Two Power Sources |
| ISL6293_06 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Li-ion/Li Polymer Battery Charger Accepting Two Power Sources |
| ISL6293-1CR | 制造商:Intersil Corporation 功能描述:SINGLE CELL LI-ION/POLYMER CHARGER, 10LD DFN 3X3 - Rail/Tube |
| ISL6293-1CR-T | 制造商:Intersil Corporation 功能描述:SINGLE CELL LI-ION/POLYMER CHARGER, 10LD DFN 3X3, T&R - Tape and Reel |
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