- 您現在的位置：買賣IC網 > PDF目錄385482 > LM3647 (National Semiconductor Corporation) Universal Battery Charger for Li-Ion, Ni-MH and Ni-Cd Batteries PDF資料下載
參數資料
| 型號： | LM3647 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Universal Battery Charger for Li-Ion, Ni-MH and Ni-Cd Batteries |
| 中文描述： | 通用電池充電器鋰離子電池，鎳氫，鎳鎘電池 |
| 文件頁數： | 7/17頁 |
| 文件大?。?/td> | 272K |
| 代理商： | LM3647 |
7
www.national.com
Resistor network selection Quick Guide:
4.3.2 Charge Timeout
The LM3647 uses the charge timeout value as a backup ter-
mination method if the normal termination methods fail. The
charge timeout also controls the length of some of the phas-
es, (e.g., the Topping Charge phase). The timeout is select-
able between a charge rate of 3.2C down to 0.4C. The table
below shows R-C values and their resulting timeout.
4.3.3 Charge Current
The charge-current is selected by setting the current sensing
resistor and the gain of the differential amplification stage.
The current sensing resistor (R5) should be dimensioned
such that a voltage drop over it is not too small, because the
signal will be more susceptible to noise and offsets in the am-
plification-stage. The resistance should not be too large ei-
ther (especially in high-current applications), because this
will only generate more heat from the component. A suitable
value is one that develops about 50mV across the resistor
when maximum current flows through it.
The current-sensing signal is amplified, inverted and cen-
tered on the 2.5V reference by the operational amplifier and
fed into the CS pin on the LM3647. The amplification stage
must be dimensioned by setting the appropriate ratio be-
tween R1 (R3) and R2 (R4). The figure below is dimensioned
for a maximum current of about 1.1A. This was dimensioned
using the following formula:
4.3.4 Dimensioning the reset circuitry
The reset-circuitry is designed to hold the RESET-pin until
the power supply to the LM3647 has stabilized. The RC-net-
work (R21 and C4) should be dimensioned in the following
way:
The diode D2 discharges the capacitance C4 when power
loss occurs. The resistor R20 is used to protect the SYSOK-
pin, and its value is not critical (typical value is 2k
). The con-
No. of Cells
Li-Ion (3.6V cell)
Normal
3.6V
7.2V
10.8V
14.4V
Max
3.675V
7.35V
11.025V
14.7V
R6
16k
62k
27k
22k
R7
30k
30k
7.5k
3.9k
1
2
3
4
No. of Cells
Li-Ion (3.7V cell)
Normal
3.7V
7.4V
11.1V
14.8V
Max
3.74V
7.48V
11.22V
14.96V
R6
16k
62k
27k
22k
R7
30k
30k
7.5k
3.9k
1
2
3
4
R Value
100 k
100 k
100 k
100 k
100 k
100 k
100 k
100 k
C Value
internal
10 nF
15 nF
22 nF
33 nF
47 nF
68 nF
100 nF
Appropriate Charge Rates
3.2C
2.4C
1.4C
1.2C
0.9C
0.7C
0.5C
0.4C
R1
R2
MaxCurrent
2
-R
(
)
R
5
=
R
1
(
)
=
R
1
R
3
=
R
2
R
4
R
2
5.1
k
=
R
1
100
k
=
R
5
0.047
=
MaxCurrent
1.09
Ampere
≈
R
21
C
4
×
(
)
5
xPowerSupplyRiseTime
>
相關PDF資料 |
PDF描述 |
|---|---|
| LM3658 | Dual Source USB/AC Li Chemistry Charger IC for Portable Applications |
| LM3658SD | Dual Source USB/AC Li Chemistry Charger IC for Portable Applications |
| LM3658SDX | Dual Source USB/AC Li Chemistry Charger IC for Portable Applications |
| LM3705XBMM-643 | Microprocessor Supervisory Circuits with Power Fail Input, Low Line Output and Manual Reset |
| LM3704XDBP-308 | Microprocessor Supervisory Circuits with Power Fail Input, Low Line Output and Manual Reset |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM3647IM | 功能描述:IC BATT CHARGER UNIVERSAL 20SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:1 系列:- 功能:充電管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:剪切帶 (CT) 產品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| LM3647IM | 制造商:Texas Instruments 功能描述:IC UNIV BATT CHARGER 3647 SOIC20 |
| LM3647M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Battery Management |
| LM3648EVM | 功能描述:LM3648 1, Non-Isolated Output LED Driver Evaluation Board 制造商:texas instruments 系列:- 零件狀態(tài):有效 電流 - 輸出/通道:1.5A 輸出和類型:1，非隔離 電壓 - 輸出:- 特性:I2C 電壓 - 輸入:2.5 V ~ 5.5 V 所含物品:板 使用的 IC/零件:LM3648 標準包裝:1 |
| LM3648TTYFFR | 功能描述:LED 驅動器 IC 1 輸出 DC DC 穩(wěn)壓器 升壓（升壓） 調光 1.5A（閃存） 12-DSBGA 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 類型:DC DC 穩(wěn)壓器 拓撲:升壓（升壓） 內部開關:是 輸出數:1 電壓 - 供電（最低）:2.5V 電壓 -?供電（最高）:5.5V 電壓 - 輸出:- 電流 - 輸出/通道:1.5A（閃存） 頻率:4MHz 調光:- 應用:照相機閃光燈 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:12-UFBGA，DSBGA 供應商器件封裝:12-DSBGA 標準包裝:1 |
發(fā)布緊急采購，3分鐘左右您將得到回復。