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FLC21 Fiches technique(PDF) 5 Page - STMicroelectronics

No de pièce FLC21
Description  LOW POWER FIRE LIGHTER CIRCUIT
PDF  6 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

FLC21 Fiches technique(HTML) 5 Page - STMicroelectronics

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FLC21 FAMILY
5/6
RS RESISTANCE CALCULATION
The Rs resistance allows, in addition with the
capacitance C, to adjust the spark frequency and
to limit the current supplied by the mains. This
resistance allows the thyristor triggering in any
requested cases. In worst cases, the system must
fire when the a.c. line voltage is minimum while the
breakdown voltage VBO and the current IBO of the
FLC are maximum.
The maximum Rs value is equal to:
Rs
VV
T T
kI
AC
BO
amb
BO
max
(
min.
)
[
max .(
.(
))]
.*
=
−+
−
21
25
α
* : see fig 1
10
12
15
18
22
27
33
39
47
10
20
30
50
F (Hz)
Rs (k )
Ω
Vac=100Vrms, Vbo=75V, Tamb=25
°C
C=1
F
µ
C=1
F
µ
C=1.5
F
µ
C=1.5
F
µ
C=2.2
F
µ
C=2.7
F
µ
C=3.3
F
µ
FLC21-65A
10
12
15
18
22
27
33
39
47
10
20
30
50
FLC21-135A
Vdc=300V, Vbo=150V, Tamb=25
°C
F (Hz)
Rs (k )
Ω
C=3.3
F
µ
C=2.7
F
µ
C=2.2
F
µ
C=1
F
µ
C=1
F
µ
C=1.5
F
µ
C=1.5
F
µ
Fig. 4: Spark frequency versus Rs and C
The couple Rs/C can be chosen with the previous
curve. Keep in mind the Rs maximum limit for
which the system would not work when the AC
mains is minimum.



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