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NTC Inrush Current Limiters
Thermistors
Application Guide
1 – HOW TO DETERMINE THE
MAXIMUM STEADY STATE
CURRENT OF NF THERMISTORS?
? If the ambient temperature is 25°C:
the current is given in table page 30.
? If the ambient temperature is different from 25°C:
the current at 25°C must be derated as specified in the
graph below.
3 – HOW TO CALCULATE THE
WORKING POINT OF NF
THERMISTOR AT A DIFFERENT
AMBIENT TEMPERATURE THAN
25°C?
Example: NF13AA0100M
I SS = 3 A, T ambient = T A = 60°C
Example: maximum steady state current of
? R T I SS 2 =
(T-T A ) and thus
NF13AA0100M at 60°C ambient:
I SSmax25 x 0.9 = 3.0 A.
T=
R T I SS2
+ T A
Derating of maximum steady state current with
ambient temperature
? As R T depends on T, this equation is quite complex to be
solved by an algebraic way. The quickest manner to solve
it is to operate by iterations:
1.00
for NF13,
= 16 mW/K (see page 29)
therefore, the equation becomes:
0.80
Not recommended for permanent use
T = 562.5 R T + 60
from the R T curve page 33 we find R T starting from T:
0.60
0.40
0.20
T (°C)
185
190
195
200
R T ( ? )
0.28
0.26
0.24
0.22
?
562.5 R T + 60 (°C)
217
206
195
184
0.00
-40
-20
0
20
40
60
80
100 120 140 160 180 200 220
The working temperature of this NF thermistor is about
AMBIENT TEMPERATURE ( ° C)
2 – HOW TO CALCULATE THE
WORKING TEMPERATURE OF
NF THERMISTOR?
195°C when operating under I SS = 3 A and T A = 60°C (this
temperature is the one for which we have T = 562.5 R T +
60).
Important: A discrepancy may exist between practice and
theory due to the tolerance of the thermistor
(±20% usually).
Example: NF08AA0330M
I SS = 0.2 A, T ambient = 25°C
? From the graph V (I) page 32, we find V SS = 2.2 V there-
fore, R SS = 11 ?
? From the graph R(T), page 32, at R = 11 ? , we find
T ± 65°C
31
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