参数资料
型号: LTC4098EUDC-3.6#PBF
厂商: LINEAR TECHNOLOGY CORP
元件分类: 稳压器
英文描述: BATTERY CHARGE CONTROLLER, PQCC20
封装: 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20
文件页数: 17/32页
文件大小: 1915K
代理商: LTC4098EUDC-3.6#PBF
LTC4098-3.6
409836f
By using a bias resistor, RNOM, different in value from
R25, the hot and cold trip points can be moved in either
direction.Thetemperaturespanwillchangesomewhatdue
to the nonlinear behavior of the thermistor. The following
equations can be used to easily calculate a new value for
the bias resistor:
R
NOM
HOT
NOM
cOLD
=
a
0 25
25
3 26
25
.
.
where
aHOT and aCOLD are the resistance ratios at the
desired hot and cold trip points. Note that these equations
Solving these equations for RNTC|COLD and RNTC|HOT
results in the following:
RNTC|HOT = 0.25 RNOM
and
RNTC|COLD = 3.26 RNOM
By setting RNOM equal to R25, the previous equations
result in
aHOT = 0.25 and aCOLD = 3.26. Referencing
these ratios to the Vishay Resistance-Temperature curve
1 chart gives a hot trip point of about 60°C and a cold trip
point of about 0°C. The difference between the hot and
cold trip points is approximately 60°C.
+
+
RNOM
100k
RNTC
100k
NTC
0.1V
NTC_ENABLE
409836 F09a
LTC4098-3.6 NTC BLOCK
TOO_COLD
TOO_HOT
0.765 NTCBIAS
0.199 NTCBIAS
+
5
NTCBIAS
4
T
+
+
RNOM
102k
RNTC
100k
R1
8.06k
NTC
0.1V
NTC_ENABLE
409836 F09b
TOO_COLD
TOO_HOT
0.765 NTCBIAS
0.199 NTCBIAS
+
5
T
NTCBIAS
4
LTC4098-3.6 NTC BLOCK
(9a)
(9b)
Figure 9. NTC Circuits
applicaTions inFormaTion
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