参数资料
型号: LTC4055EUF
厂商: Linear Technology
文件页数: 17/24页
文件大小: 0K
描述: IC USB PWR MNGR BATT CHRGR 16QFN
标准包装: 91
功能: 充电管理
电池化学: 锂离子(Li-Ion)
电源电压: 4.35 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-WQFN 裸露焊盘
供应商设备封装: 16-QFN(4x4)
包装: 管件
LTC4055/LTC4055-1
OPERATION
V NTC
15
LTC4055/LTC4055-1
NTC BLOCK
V NTC
15
LTC4055/LTC4055-1
NTC BLOCK
R NOM
100k
NTC
16
0.74 ? V NTC
+
TOO_COLD
R NOM
121k
NTC
16
0.74 ? V NTC
+
TOO_COLD
R NTC
R1
100k
TOO_HOT
13.3k
TOO_HOT
0.29 ? V NTC
+
R NTC
0.29 ? V NTC
+
100k
+
NTC_ENABLE
+
NTC_ENABLE
0.1V
(3a)
4055 F03a
0.1V
(3b)
4055 F03b
Figure 3. NTC Circuits
R COLD
THERMISTORS
The LTC4055/LTC4055-1 NTC trip points were designed
to work with thermistors whose resistance-temperature
characteristics follow Vishay Dale’s “R-T Curve 2.” The
Vishay NTHS0603N02N1002J is an example of such a
thermistor. However, Vishay Dale has many thermistor
products that follow the “R-T Curve 2” characteristic in
a variety of sizes. Furthermore, any thermistor whose
R NOM for a shift to lower temperature for example, use
the following equation:
R NOM = ? R NTC at 25 ° C
2 . 815
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 equation:
ratio of R COLD to R HOT is about 7.0 will also work
(Vishay Dale R-T Curve 2 shows a ratio of R COLD to R HOT
of 2.815/0.4086 = 6.89).
R NOM =
R HOT
0 . 4086
? R NTC at 25 ° C
Power conscious designs may want to use thermistors
whose room temperature value is greater than 10k. Vishay
Dale has a number of values of thermistor from 10k to 100k
that follow the “R-T Curve 1.” Using these as indicated
in the NTC Thermistor section will give temperature trip
points of approximately 3°C and 47°C, a delta of 44°C. This
delta in temperature can be moved in either direction by
where R HOT is the resistance ratio of R NTC at the desired
hot temperature trip point.
Here is an example using a 100k R-T Curve 1 thermistor
from Vishay Dale. The difference between the trip points
is 44°C, from before, and we want the cold trip point to
be 0°C, which would put the hot trip point at 44°C. The
R NOM needed is calculated as follows:
changing the value of R NOM with respect to R NTC . Increasing
R NOM will move both trip points to lower temperatures.
Likewise a decrease in R NOM with respect to R NTC will
move the trip points to higher temperatures. To calculate
R NOM =
=
R COLD
2 . 815
3.266
2 . 815
? R NTC at 25 ° C
? 100 k = 116 k
4055fb
17
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