FLC21-65A STMICROELECTRONICS [STMicroelectronics], FLC21-65A Datasheet - Page 5

• Manufacturer Part Number: FLC21-65A
• Description: LOW POWER FIRE LIGHTER CIRCUIT
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

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
Rs
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.
The maximum Rs value is equal to:
* : see fig 1
50
30
20
10
10
max
F (Hz)
12
(
V
AC
15
min.
FLC21-65A
18
2
)
Rs (k )
22
[
V
BO
Vac=100Vrms, Vbo=75V, Tamb=25 C
k I
max .(
.
27
BO
1
*
33
T T
39
.(
amb
47
50
30
20
10
25
requested cases. In worst cases, the system must
fire when the a.c. line voltage is minimum while the
breakdown voltage V
FLC are maximum.
10
F (Hz)
))]
12
15
18
FLC21-135A
BO
Rs (k )
22
and the current I
Vdc=300V , Vbo=150V , Tamb=25 C
27
FLC21 FAMILY
33
BO
39
of the
47
5/6