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參數(shù)資料
| 型號(hào)： | LX2207 |
| 廠商： | Microsemi Corporation |
| 英文描述： | Three Level Lithium Ion Battery Charger |
| 中文描述： | 三級(jí)鋰離子電池充電器 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 400K |
| 代理商： | LX2207 |
LX2207
P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
Copyright
2005
Rev. 1.0, 2007-01-03
W
M
.
C
Three Level Lithium Ion Battery Charger
TM
A P P L I C A T I O N N O T E
B
ATTERY
T
EMPERATURE
M
ONITOR
The LX2207 has an input to monitor the battery
temperature during battery charging; this method
assumes the battery pack contains a thermistor
expressly for this purpose. A typical Lithium ion battery
should only be charged from a range of 0
°
C to 60
°
C.
For this calculation, a Vishay NTHS0402N01N1003J
Thermistor was used. This thermistor is 327k
at 0
°
C,
100k
at 25
°
C and 24.9k
at 60
°
C. The thermistor
must be biased with a Thevenin voltage source and
series resistance to achieve the proper thresholds. A
fixed value resistor is added in series with the
thermistor to prevent it from becoming too low an
impedance at high temperatures and causing the TMP
input to default to off.
V
TH
R
TH
R
NTC
R
MIN
TMP
Using a value of R
MIN
that is equal to the thermistor
temperature at 60
°
C works well; therefore, for this
example, set the value of R
MIN
to 24.9k. This has the
effect of adding 24.9k to the thermistor resistance
values so it becomes 352k
at 0
°
C, 125k
at 25
°
C and
49.8k
at 60
°
C.
The equations for R
TH
and V
TH
are:
(
(
) (
0.99
K
=
=
K
R
0C
T
TH
=
×
Where R at temperature is the sum of the thermistor
plus R
MIN
.
)
)
R
0.74
R
0.29
R
×
R
0.74
0.29
V
V
60C
T
0C
T
60C
T
0C
T
IN
TH
×
×
×
=
=
=
=
=
121k
R
1
0.74
=
=
To finish the design it is necessary to create the
Thevenin Voltage and resistance using a voltage
divider from the input pin (IN).
V
IN
R
1
R
NTC
R
MIN
TMP
R
2
The values of R1 and R2 can be calculated as:
R
R
1
=
=
122k
K
TH
14,800k
R
R
R
R
R
TH
1
TH
1
2
=
×
=
In this case, it is not necessary to use R2, because the
value is so large it is insignificant. In this case, R1 = R
TH
.
The final circuit for this example is:
V
IN
121k
R
NTC
24.9k
TMP
The TMP voltages with this circuit are:
TEMP (°C)
-20
0
25
60
80
RNTC
971k
327k
100k
24.9k
12.6k
VTMP (%
V
IN
)
89%
74%
51%
29%
24%
A
P
P
L
I
C
A
T
I
O
N
S
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