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參數(shù)資料
| 型號： | LX2207ILD-TR |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MLPD-12 |
| 文件頁數(shù)： | 14/14頁 |
| 文件大?。?/td> | 399K |
| 代理商： | LX2207ILD-TR |
LX2207
PRODUCTION DATA SHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
Copyright
2007
Rev. 1.0a, 2007-10-08
WWW
.Microse
m
i
.CO
M
Three Level Lithium Ion Battery Charger
TM
APPLICATION NOTE
BATTERY TEMPERATURE MONITOR
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.
VTH
RTH
RNTC
RMIN
TMP
Using a value of RMIN that is equal to the thermistor
temperature at 60°C works well; therefore, for this
example, set the value of RMIN 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 RTH and VTH are:
()
() (
)
0.99
K
R
0.74
R
0.29
R
0.74
0.29
V
60C
T
0C
T
60C
T
0C
T
IN
TH
=
×
×
×
=
121k
R
1
0.74
K
R
0C
T
TH
=
×
=
Where R at temperature is the sum of the thermistor
plus RMIN.
To finish the design it is necessary to create the
Thevenin Voltage and resistance using a voltage
divider from the input pin (IN).
VIN
R1
RNTC
RMIN
TMP
R2
The values of R1 and R2 can be calculated as:
122k
K
R
TH
1
=
14,800k
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 = RTH.
The final circuit for this example is:
VIN
121k
RNTC
24.9k
TMP
The TMP voltages with this circuit are:
TEMP (°C)
RNTC
VTMP (%VIN)
-20
971k
89%
0
327k
74%
25
100k
51%
60
24.9k
29%
80
12.6k
24%
AA
PP
LL
IICC
AA
TT
IIOO
NN
SS
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