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參數(shù)資料
| 型號： | LTC4085EDE-3#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PDSO14 |
| 封裝： | 4 X 3 MM, PLASTIC, MO-229, DFN-14 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 275K |
| 代理商： | LTC4085EDE-3#TRPBF |
LTC4085-3
20
40853f
Alternate NTC Thermistors
The LTC4085-3 NTC trip points were designed to work
with thermistors whose resistance-temperature charac-
teristics follow Vishay Dale’s “R-T Curve 2.” The Vishay
NTHS0603N02N1002J is an example of such a thermis-
tor. However, Vishay Dale has many thermistor products
that follow the “R-T Curve 2” characteristic in a variety of
sizes. Furthermore, any thermistor whose ratio of RCOLD
to RHOT is about 6.0 will also work (Vishay Dale R-T Curve
2 shows a ratio of 2.816/0.4839 = 5.82).
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 42°C, a delta of 39°C.
This delta in temperature can be moved in either direc-
tion by changing the value of RNOM with respect to RNTC.
Increasing RNOM will move both trip points to lower
temperatures. Likewise, a decrease in RNOM with respect
to RNTC will move the trip points to higher temperatures.
To calculate RNOM for a shift to lower temperature, for
example, use the following equation:
RNOM =
RCOLD
2.816
RNTC at 25°C
where RCOLD is the resistance ratio of RNTC at the desired
cold temperature trip point. To shift the trip points to higher
temperatures use the following equation:
RNOM =
RHOT
0.484
RNTC at 25°C
where RHOT is the resistance ratio of RNTC at the desired
hot temperature trip point.
The following example uses a 100k R-T Curve 1 Thermistor
from Vishay Dale. The difference between the trip points
is 39°C, from before—and the desired cold trip point of
0°C, would put the hot trip point at about 39°C. The RNOM
needed is calculated as follows:
RNOM =
RCOLD
2.816
RNTC at 25°C=
3.266
2.816
100kΩ = 116kΩ
The nearest 1% value for RNOM is 115k. This is the value
used to bias the NTC thermistor to get cold and hot trip
points of approximately 0°C and 39°C, respectively. To
extend the delta between the cold and hot trip points, a
resistor (R1) can be added in series with RNTC(seeFigure4).
The values of the resistors are calculated as follows:
RNOM =
RCOLD – RHOT
2.816 – 0.484
R1=
0.484
2.816 – 0.484
RCOLD –RHOT
[]–R
HOT
where RNOM is the value of the bias resistor, RHOT and
RCOLD are the values of RNTC at the desired temperature
trip points. Continuing the forementioned example with
a desired hot trip point of 50°C:
RNOM =
RCOLD –RHOT
2.816 – 0.484
=
100k (3.266 – 0.3602)
2.816 – 0.484
= 124.6k,124k nearest 1%
R1= 100k
0.484
2.816 – 0.484
3.266 – 0.3602
() – 0.3602
= 24.3k
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