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參數(shù)資料
| 型號(hào)： | LTC4097EDDB |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| 封裝： | 3 X 2 MM, 0.75 MM HEIGHT, PLASTIC, DFN-12 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 219K |
| 代理商： | LTC4097EDDB |
LTC4097
17
4097f
APPLICATIONS INFORMATION
–
+
–
+
RNOM
100k
RNTC
100k
NTC
VNTC
3
0.1V
NTC_ENABLE
4097 F04
NTC BLOCK
TOO_COLD
TOO_HOT
0.765 VNTC
0.349 VNTC
–
+
6
–
+
–
+
RNOM
105k
RNTC
100k
R1
12.7k
NTC
VNTC
3
0.1V
NTC_ENABLE
4097 F05
TOO_COLD
TOO_HOT
0.765 VNTC
0.349 VNTC
–
+
6
NTC BLOCK
Figure 4. Typical NTC Thermistor Circuit
and the cold trip point is set when:
R
RR
VNTC
NTC COLD
NOM
NTC COLD
|
.
+
= 0 765
Solving these equations for RNTC|COLDandRNTC|HOTresults
in the following:
RNTC|COLD = 0.536 RNOM
and
RNTC|COLD = 3.25 RNOM
By setting RNOM equal to R25, the above equations result
in rHOT = 0.536 and rCOLD = 3.25. Referencing these ratios
to the Vishay Resistance-Temperature Curve 1 chart gives
a hot trip point of about 40°C and a cold trip point of about
0°C. The difference between the hot and cold trip points
is approximately 40°C.
By using a bias resistor, RNOM, different in value from R25,
the hot and cold trip points can be moved in either direc-
tion. The temperature span will change somewhat due to
the non-linear behavior of the thermistor. The following
equations can be used to easily calculate a new value for
the bias resistor:
R
r
R
r
R
NOM
HOT
NOM
COLD
=
0 536
25
325
25
.
.
where rHOT and rCOLD are the resistance ratios at the
desired hot and cold trip points. Note that these equations
are linked. Therefore, only one of the two trip points can
be chosen, the other is determined by the default ratios
designed in the IC. Consider an example where a 60°C
hot trip point is desired.
From the Vishay Curve 1 R-T characteristics, rHOT is 0.2488
at 60°C. Using the above equation, RNOM should be set
to 46.4k. With this value of RNOM, the cold trip point is
about 16°C. Notice that the span is now 44°C rather than
the previous 40°C. This is due to the decrease in “tem-
perature gain” of the thermistor as absolute temperature
increases.
The upper and lower temperature trip points can be inde-
pendently programmed by using an additional bias resistor
as shown in Figure 5. The following formulas can be used
to compute the values of RNOM and R1:
R
rr
R
RR
r
NOM
COLD
HOT
NOM
HOT
=
–
.
.
–
2 714
25
1 0 536
R
R25
For example, to set the trip points to 0°C and 45°C with
a Vishay Curve 1 thermistor choose
Rk
k
NOM ==
3 266 0 4368
2 714
100
104 2
.– .
.
Figure 5. NTC Thermistor Circuit with Additional Bias Resistor
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