參數(shù)資料
型號(hào): LM3647IMX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類(lèi): 電源管理
英文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20
封裝: PLASTIC, SOIC-20
文件頁(yè)數(shù): 12/14頁(yè)
文件大?。?/td> 271K
代理商: LM3647IMX
4.0 Functional Description (Continued)
Resistor network selection Quick Guide:
No. of
Cells
Ni-Cd/Ni-MH
Nominal
Max
R6
R7
2
2.4V
3.7V
10k
43k
3
3.6V
5.55V
47k
56k
4
4.8V
7.4V
16k
11k
5
6V
9.25V
62k
30k
6
7.2V
11.1V
15k
5.6k
7
8.4V
12.95V
27k
8.2k
8
9.6V
14.8V
39k
10k
9
10.8V
16.65V
68k
15k
10
12V
18.5V
22k
3.9k
Example: A standard 9V Ni-Cd block battery is composed of
6 small Ni-Cd cells and therefore has a nominal voltage of
7.2V. See table above for resistor values.
Li-Ion
The voltage divider network for Li-Ion must be selected with
great care for maximum utilization of the batteries. Li-Ion
battery cells have a nominal voltage of 3.6V or 3.7V and the
maximum voltage per cell is specified at 4.1V or 4.2V re-
spectively. By multiplying the number of battery cells with the
maximum cell voltage, it is possible to determine the Maxi-
mum Voltage of the Battery Pack. When the maximum bat-
tery voltage (V
Batm) has been determined, the voltage di-
vider network has to be dimensioned using the following
formula (SEL2 open):
Pin SEL3
GND
V
CC
The LM3647 supports two different user selectable battery
input voltages on the CEL pin. These are 2.675V (SEL3 tied
to GND) and 2.740V (SEL3 tied to V
CC). This selection pin
can be used to configure the charger to handle both 3.6V
and 3.7V Li-Ion-cells, without changing the resistor values in
the CEL pin voltage divider network. SEL3 can also be used
to obtain a better match when choosing standard series
resistor values for certain cell combinations.
10131810
Resistor network selection Quick Guide:
No. of
Cells
Li-Ion (3.6V cell)
Nominal
Max
R6
R7
1
3.6V
4.1V
16k
30k
2
7.2V
8.2V
62k
30k
3
10.8V
12.3V
27k
7.5k
4
14.4V
16.4V
22k
3.9k
No. of
Cells
Li-Ion (3.7V cell)
Nominal
Max
R6
R7
1
3.7V
4.2V
16k
30k
2
7.4V
8.4V
62k
30k
3
11.1V
12.6V
27k
7.5k
4
14.8V
16.8V
22k
3.9k
4.3.2 Charge Timeout
The LM3647 uses the charge timeout value as a backup
termination method if the normal termination methods fail.
The charge timeout also controls the length of some of the
phases, (e.g., the Topping Charge phase). The timeout is
selectable by choosing different R-C values as shown in the
table below:
R Value
C Value
Ni-Cd/Ni-MH Fast
Charge (minutes)
Ni-Cd/Ni-MH
Topping (minutes)
Li-Ion CC
(minutes)
Li-Ion CV
(minutes)
100 k
0 nF
75205075
100 k
10 nF
100
25
70
100
100 k
15 nF
160
40
110
160
100 k
22 nF
190
50
130
190
100 k
33 nF
260
65
170
260
100 k
47 nF
330
80
220
330
100 k
68 nF
450
115
300
450
100 k
100 nF
540
135
360
540
LM3647
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