參數(shù)資料
型號(hào)： LTC4001-1EUF#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16
封裝： 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGC, QFN-16
文件頁(yè)數(shù)： 4/20頁(yè)
文件大?。?/td> 227K
代理商： LTC4001-1EUF#TRPBF
12
LTC4001-1
40011f
The battery temperature is measured by placing a negative
temperature coefficient (NTC) thermistor close to the
battery pack. To use this feature, connect the NTC ther-
mistor, RNTC, between the NTC pin and GNDSENS and the
resistor, RNOM, from the NTC pin to VINSENSE. RNOM
should be a 1% resistor with a value equal to the value of
the chosen NTC thermistor at 25
°C. The LTC4001-1 goes
into hold mode when the resistance, RHOT, of the NTC
thermistor drops to 0.41 times the value of RNOM. For
instance for RNTC = 10k. (The value for a Vishay
NTHS0603N02N1002J thermistor at 25
°C) hold occurs at
approximately 4.1k, which occurs at 50
°C. The hold mode
freezes the timer and stops the charge cycle until the
thermistor indicates a return to a valid temperature. As the
temperature drops, the resistance of the NTC thermistor
rises. The LTC4001-1 is designed to go into hold mode
when the value of the NTC thermistor increases to 2.82
times the value of RNOM. This resistance is RCOLD. For the
Vishay 10k thermistor, this value is 28.2k, which corre-
sponds to approximately 0
°C. The hot and cold compara-
tors each have approximately 3
°C of hysteresis to prevent
oscillation about the trip point. Grounding the NTC pin
disables the NTC function.
Thermistors
The LTC4001-1 NTC trip points were designed to work
with thermistors whose resistance temperature charac-
teristics follow Vishay Dale’s “R-T Curve 2.” However, any
thermistor whose ratio of RCOLD to RHOT is about 7 will
also work (Vishay Dale R-T Curve 2 shows a ratio of RCOLD
to RHOT of 2.815/0.4086 = 6.89).
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 indi-
cated 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 changing the value of RNOM with respect to RNTC.
Increasing RNOM will move the trip points to higher tem-
peratures. To calculate RNOM for a shift to lower tempera-
ture for example, use the following equation:
R
Rat
C
NOM
COLD
NTC
=°
2 815
25
.
where RCOLD is the resistance ratio of RNTC at the desired
cold temperature trip point. If you want to shift the trip
points to higher temperatures use the following equation:
R
Rat
C
NOM
HOT
NTC
=°
0 4086
25
.
where RHOT is the resistance ratio of RNTC 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 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 RNOM
needed is calculated as follows:
R
Rat
C
kk
NOM
COLD
NTC
=°
==
2 815
25
3 266
2 815
100
116
.
.
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 44°C respectively. To
extend the delta between the cold and hot trip points a
resistor, R1, can be added in series with RNTC (see
Figure 4). The values of the resistors are calculated as
follows:
R
RR
R
NOM
COLD
HOT
COLD
HOT
=
()
–
.– .
.
.– .
–
2 815 0 4086
1
0 4086
2 815 0 4086
APPLICATIO S I FOR ATIO
WU
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