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參數(shù)資料
| 型號： | ISL6292D |
| 廠商： | Intersil Corporation |
| 英文描述： | Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear and Preset 14-SOIC -40 to 85 |
| 中文描述： | Li-ion/Li聚合物電池充電器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 461K |
| 代理商： | ISL6292D |
10
End-of-Charge (EOC) Current
The end-of-charge current I
MIN
sets the level at which the
charger indicates the end of the charge with the STAT1 and
STAT2 pins, as shown in Figure 4. The charger terminates at
this moment. The I
MIN
is set in two ways, by connecting a
resistor between the IMIN pin and ground, or by connecting
the IMIN pin to the V2P8 pin. When programming with the
resistor, the I
MIN
is set in the equation below.
(EQ. 6)
where R
IMIN
is the resistor connected between the IMIN pin
and the ground. When connected to the V2P8 pin, the I
MIN
is set to 1/10 of I
REF
, except when the IREF pin is shorted to
GND. Under this exception, I
MIN
is 5mA.
Charge Current Thermal Foldback
Over-heating is always a concern in a linear charger. The
maximum power dissipation usually occurs at the beginning
of a charge cycle when the battery voltage is at its minimum
but the charge current is at its maximum. The charge current
thermal foldback function in the ISL6292D frees users from
the over-heating concern.
Figure 5 shows the current signals at the summing node of
the current error amplifier CA in the Block Diagram. I
R
is the
reference. I
T
is the current from the Temperature Monitoring
block. The I
T
has no impact on the charge current until the
internal temperature reaches approximately 100°C; then I
T
rises at a rate of 1
μ
A/°C. When I
T
rises, the current control
loop forces the sensed current I
SEN
to reduce at the same
rate. As a mirrored current, the charge current is 100,000
times that of the sensed current and reduces at a rate of
100mA/°C. For a charger with the constant charge current
set at 1A, the charge current is reduced to zero when the
internal temperature rises to 110°C. The actual charge
current settles between 100°C to 110°C.
Usually the charge current should not drop below I
MIN
because of the thermal foldback. For some extreme cases if
that does happen, the charger does not indicate end-of-
charge unless the battery voltage is already above the
recharge threshold.
2.8V Bias Voltage
The ISL6292D provides a 2.8V voltage for biasing the
internal control and logic circuit. This voltage is also
available for external circuits such as the NTC thermistor
circuit. The maximum allowed external load is 2mA.
NTC Thermistor
The ISL6292D uses two comparators (CP2 and CP3) to form
a window comparator, as shown in Figure 7.
When the TEMP
pin voltage is “out of the window,” determined by the V
TMIN
and V
TMAX
, the ISL6292D stops charging and indicates a
fault condition. When the temperature returns to the set range,
the charger re-starts a charge cycle. The two MOSFETs, Q1
and Q2, produce hysteresis for both upper and lower
thresholds. The temperature window is shown in Figure 6.
I
MIN
10000
V
IMIN
----------------
IMIN
R
4
×
10
A
( )
=
=
FIGURE 5. CURRENT SIGNALS AT THE AMPLIFIER CA INPUT
Temperature
100
O
C
I
R
I
T
I
SEN
FIGURE 6. CRITICAL VOLTAGE LEVELS FOR TEMP PIN
3.0V
V
TMIN
(1.50V)
0V
Under
Temp
Over
Temp
TEMP
Pin
Voltage
V
(1.286V)
V
TMAX
(0.605V)
V
TMAX+
(0.660V)
+
-
+
-
V2P8
TEMP
GND
2.8V
R2
R3
R4
R5
Q1
Q2
CP2
CP3
Under
Temp
Over
Temp
ISL6292D
R
U
To TEMP Pin
V
TMIN
V
TMAX
R
T
+
-
R1
Battery
Removal
CP1
V
RMV
FIGURE 7. THE INTERNAL AND EXTERNAL CIRCUIT FOR
THE NTC INTERFACE
ISL6292D
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| ISL6295CV-T | Low Voltage Fuel Gauge |
| ISL6295 | Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear and Preset 14-TSSOP -40 to 85 |
| ISL6295CV | Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear and Preset 14-TSSOP -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| ISL6292DCR4 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Li-ion/Li Polymer Battery Charger |
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| ISL6292DCRZ | 功能描述:電池管理 LINEAR SINGLE CELL LI-ION CHRGR 16LD 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 |
| ISL6292DCRZ-T | 功能描述:電池管理 LINEAR SINGLE CELL LI-ION CHRGR 16LD 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 |
| ISL6292EVAL1 | 功能描述:EVALUATION BOARD 1 ISL6292 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時(shí)/停產(chǎn)零件編號 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
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