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参数资料
| 型号： | LTC4061EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER LI-ION 10-DFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.3 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 管件 |
LTC4061
APPLICATIONS INFORMATION
R NOM =
? R NTC at 25 ° C
R NOM =
? R NTC at 25 ° C
=
? 10 k Ω = 8 . 62 k Ω
R NOM =
R 1 = ?
? ( R COLD HOT HOT
– R
)– R
R NOM =
R COLD – R HOT 10 k ? ( 2 . 816 – 0 . 4086 )
=
R 1 = 10 k ? ?
R NOM =
? R NTC at 25 ° C
ItisimportanttorememberthatLTC4061applicationsdo
not need to be designed for worst-case thermal conditions,
since the IC will automatically reduce power dissipation if
the junction temperature reaches approximately 105°C.
Thermistors
The LTC4061 NTC comparator trip points were designed
to work with thermistors whose resistance-temperature
characteristics follow Vishay Dale’s “R-T Curve 1.” The
Vishay NTHS0603N01N1003J is an example of such a
thermistor. However, Vishay Dale has many thermistor
products that follow the “R-T Curve 1” characteristic in a
variety of sizes. Furthermore, any thermistor whose ratio
of R COLD to R HOT is about 6 also works (Vishay Dale R-T
Curve 1 shows a ratio of R COLD to R HOT of 3.266/0.5325
= 6.13).
Power conscious designers may want to use thermistors
whose room temperature value is greater than 10k Ω .
Vishay Dale has a number of values of thermistor from
10k Ω to 100k Ω that follow the “R-T Curve 1.” Using dif-
ferent R-T curves, such as Vishay Dale “R-T Curve 2,” is
also possible. This curve, combined with LTC4061 internal
thresholds, gives temperature trip points of approximately
0°C (falling) and 40°C (rising), a delta of 40°C. This delta in
temperature can be moved in either direction by changing
the value of R NOM with respect to R NTC . Increasing R NOM
moves both trip points to lower temperatures. Likewise
a decrease in R NOM with respect to R NTC moves the trip
points to higher temperatures. To calculate R NOM for a shift
to lower temperatures, use the following equation:
R COLD
3 . 266
where R COLD is the resistance ratio of R NTC at the desired
cold temperature trip point. If you want to shift the trip points
to higher temperatures, use the following equations:
R HOT
0 . 5325
where R HOT is the resistance ratio of R NTC at the desired
hot temperature trip point.
Here is an example using 10k Ω R-T Curve 2 thermistor
from Vishay Dale. The difference between the trip points
is 40°C, from before, and we want the cold trip point to
be 0°C, which would put the hot trip point at 40°C. The
R NOM needed is calculated as follows:
R COLD
3 . 266
2 . 816
3 . 266
The nearest 1% value for R NOM is 8.66k Ω . This is the
value used to bias the NTC thermistor to get cold and hot
trip points of approximately 0°C and 40°C respectively.
To extend the delta between the cold and hot trip points, a
resistor, R1, can be added in series with R NTC . The values
of the resistors are calculated as follows:
R COLD – R HOT
3 . 266 – 0 . 5325
? 0 . 5325 ?
? 3 . 266 - 0 . 532 5 ? ?
where R NOM is the value of the bias resistor, R HOT and
R COLD are the values of R NTC at the desired temperature
trip points. Continuing the example from before with a
desired hot trip point of 50°C:
3 . 266 – 0 . 5325 3.. 266 – 0 . 5325
= 8 . 8 k Ω , 8 . 87 k is the nearest 1 % value .
? 0 . 5325 ?
? 3 . 266 – 0 . 5325 ? ?
? ( 2 . 816 – 0 . 4086 ) – 0 . 4086
= 604 Ω , 604 is the nearest 1 % value .
The final solution is R NOM = 8.87k Ω , R1 = 604 Ω and
R NTC = 10k Ω at 25°C.
NTC Trip Point Error
When a 1% resistor is used for R HOT , the major error
in the 40°C trip point is determined by the tolerance of
the NTC thermistor. A typical 100k Ω NTC thermistor has
±10% tolerance. By looking up the temperature coef-
ficient of the thermistor at 40°C, the tolerance error can
4061fd
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