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N_06J00151 Datasheet(PDF) 6 Page - AVX Corporation

Part # N_06J00151
Description  NTC Thermistors
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Manufacturer  AVX [AVX Corporation]
Direct Link  http://www.avx.com
Logo AVX - AVX Corporation

N_06J00151 Datasheet(HTML) 6 Page - AVX Corporation

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5
2.2.5. Voltage – Current curves V (l)
These curves describe the behavior of the voltage drop V
measured across the NTC as the current l through the NTC
is increased.
They describe the state of equilibrium between power
resulting from Joule effect and dissipated power in the
surroundings. (Figure 4)
Figure 4 – Voltage – current curve V (l)
Several zones can be identified:
– low current zone
dissipated energy only produces negligible heating and
the curve V (l) is almost linear.
– non-linear zone
the curve V (l) displays a maximum voltage Vmax for a
current lo.This maximum voltage Vmax and the temper-
ature Tmax reached by the NTC under these conditions
can be determined by using the equations:
P = V2/R =
(T - Tamb)
and
R = Ramb • exp B (1/T - 1/Tamb)
therefore:
Tmax = B/2 -
B2/4 - BTamb ~ Tamb
Vmax =
(Tmax - Tamb ) • Ramb exp
[B(
1 - 1 )]
Tmax Tamb
where
is the dissipation factor and Tamb is the ambi-
ent temperature.
– high current zone
for higher currents, an increase in temperature of the
NTC decreases the resistance and the voltage more
rapidly than the increase of the current. Above a certain
dissipated power, the temperature of the NTC exceeds
the permissible value.
2.2.6. Current – Time curves l(t)
When voltage is applied to a thermistor, a certain amount of
time is necessary to reach the state of equilibrium described
by the V(l) curves.
This is the heating up time of the thermistor which depends
on the voltage and the resistance on one side and the heat
capacity and dissipation on the other.
The curves l(t) are of particular interest in timing applications.
2.2.7. Thermal time constant
When a thermistor is self-heated to a temperature T above
ambient temperature Tamb, and allowed to cool under zero
power resistance, this will show a transient situation.
At any time interval dt, dissipation of the thermistor
( (T – Tamb)dt) generates a temperature decrease –HdT,
resulting in the equation:
1
dT = -
dt
(T - Tamb)H
The solution to this equation for any value of t, measured
from t = 0, is:
n (T - Tamb) = -
t
(To - Tamb)H
We can define a thermal time constant
as:
= H/
expressed in seconds.
Where the time t =
:
(T - Tamb) / (To - Tamb) = exp - 1 = 0.368
expressing that for t = , the thermistor cools to 63.2% of the
temperature difference between the initial To and Tamb (see
Figure 5).
According to IEC 539 our technical data indicates
mea-
sured with To = 85°C, Tamb = 25°C and consequently
T = 47.1°C.
Figure 5 – Temperature – time curve T(t)
2.2.8. Response time
More generally, it is possible to define a response time as the
time the thermistor needs to reach 63.2% of the total
temperature difference when submitted to a change in the
thermal equilibrium (for example from 60°C to 25°C in
silicone oil 47V20 Rhodorsil).
T (
°C)
85
47.1
25
t
t (s)
V
Vmax
Io
I
NTC Thermistors
General Characteristics
(
)
1+Tamb
B


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