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| 型號： | LX2208ILD-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： | 3 X 3 MM, ROHS COMPLIANT, PLASTIC, MLPD-12 |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 250K |
| 代理商： | LX2208ILD-TR |
LX2208
PRODUCTION DATA SHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
WWW
.Microse
m
i
.CO
M
2 Amp Three Level Lithium Ion Battery Charger
TM
LL
XX
22
00
88
Copyright
2007
Rev. 1.0, 2007-04-03
APPLICATION NOTE
BATTERY TEMPERATURE MONITOR
The LX2208 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 within a temperature
range of 0°C to 60°C. For this calculation, a Vishay
NTHS0402N01N1003J Thermistor was used.
This
thermistor has the value of 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 TMP thresholds. A
fixed value resistor is added in series with the
thermistor to prevent it from becoming too low
impedance at high temperatures and causing the TMP
input to default to off.
VTH
RTH
R
NTC
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, using Cold
Temperature Fault Threshold average of 74% and the
Hot Temperature Fault Threshold average of 29% of
VIN:
()
() (
)
0.99
K
R
0.74
R
0.29
R
0.74
0.29
V
C
60
T
C
0
T
C
60
T
C
0
T
IN
TH
=
×
×
×
=
°
=
°
=
°
=
°
=
121k
R
1
0.74
K
R
C
0
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
R1
TH
=
14,800k
R
R2
TH
1
TH
1
=
×
=
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%
At the trip point threshold, there may be chattering on
and off of the charging current. However, as the
temperature increases or decreases further from the trip
point threshold, the chattering will stop.
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