FLC01
Fire lighter circuit
Datasheet
−
production data
Description
TA B
The FLC01 series has been especially developed
for capacitance discharge operation. The main
applications are gas lighters or ignitors such as
cookers / gas boilers / gas hobs...
TA B
1
2
3
1
2
3
I K
PA
D PA K
It provides a fully integrated function, with high
performance and reliability levels, adapted to
severe and hot temperature environment.
–
Th:
Thyristor for switching operation
–
Z:
Zener diode to set the threshold voltage
–
D:
Diode for reverse conduction
–
R:
2 kΩ resistor
.
Table 1. Device summary
Symbol
I
T(rms)
V
DRM
, V
RRM
I
GT
Value
4
600
5
Unit
A
V
mA
Features
•
Dedicated thyristor structure for capacitance
discharge ignition operation
•
High pulse current capability:
– 190 A at t
p
= 10 µs
•
Fast turn-on operation
•
Designed for high ambient temperature (up to
120° C)
Figure 1. Functional diagram
pin 2
Benefits
•
Space saving thanks to monolithic function
integration
•
High reliability with planar technology
R
Z
Th
D
pin 1
* pin 3 non connected
May 2014
This is information on a product in full production.
DocID3616 Rev 7
1/11
www.st.com
11
Characteristics
FLC01
1
Characteristics
Table 2. Absolute ratings (limiting values)
Symbol
I
TRM
I
FRM
dl/dt
T
stg
T
j
T
oper
T
L
Parameter
Repetitive surge peak on state current for thyristor
-30° C
≤
T
amb
≤
120° C
Repetitive surge peak on state current for diode
-30° C
≤
T
amb
≤
120° C
Critical rate of rise time on state current -30° C
≤
T
amb
≤
120° C
Storage junction temperature range
Maximum junction temperature
Operating temperature range
Maximum lead temperature for soldering during 10s
Value
Unit
t
p
= 10 µs
(Figure
3)
190
A
120
- 40 to + 150
+ 125
- 30 to + 120
260
A/µs
°C
°C
°C
Table 3. Thermal resistance
Symbol
R
th(j-a)
Parameter
Thermal resistance junction to ambient
100
Min.
° C/W
Figure 2. Electrical characteristics (definitions)
Sym bol= Par et
m er
V
RM
V
BO
V
T
V
F
I
BO
I
RM
72
T
=
=
=
=
=
=
=
Stand-off voltage
Breakover voltage
V
BO
On-state voltage
Diode forward drop
Breakover current
Leakage current
Temperature coefficient for V
BO
I
I
F
V
R M
V
T
I M
R
I O
B
VF
V
IT
Table 4. Electrical characteristics: diode (D) parameter
Symbol
V
F
I
F
= 2 A
t
p
≤
500 µs
Test Conditions
T
j
= 25° C
MAX
Value
1.7
Unit
V
Table 5. Electrical characteristics: Thyristor (Th) and Zener (Z) parameters
Symbol
I
RM
V
BO
I
BO
V
T
αT
V
RM
= 200 V
at I
BO
at V
BO
I
T
= 2 A
t
p
≤
500 µs
Test Conditions
T
j
= 25° C
T
j
= 125° C
T
j
= 25° C
T
j
= 25° C
T
j
= 25° C
0.27
206
220
Min.
Typ.
Max
1
10
233
0.5
1.7
Unit
µA
µA
V
mA
V
V/° C
2/11
DocID3616 Rev 7
FLC01
Characteristics
Figure 3.
Test current waveform
Figure 4.
Relative variation of breakover
current versus junction
temperature
k = I
BO
(Tj) / I
BO
(25°C)
2.5
2
1.5
1
10µs
0.5
200ms
0
-20
0
20
40
60
80
100
Tj (°C)
Figure 5. Basic application
Ic
Ic
t
Rs
Ds
c
Th
AC
Z
D
MAINS
R
FLC01-200x
DocID3616 Rev 7
3/11
Characteristics
The applications of the lighter using the capacitance discharge topology operate in 2
phases:
FLC01
Phase 1
The energy coming from the mains is stored into the capacitor C. For that, the AC voltage is
rectified by the diode Ds.
Phase 2
At the end of the phase 1, the voltage across the capacitor C reaches the avalanche
threshold of the zener. Then a current flows through the gate of the thyristor Th which fires.
–
–
–
The firing of the thyristor causes an alternating current to flow through the
capacitor C
The positive parts of this current flow through C, Th and the primary of the HV
transformer
The negative parts of the current flow through C, D and the primary of the HV
transformer
RS resistor calculation
The Rs resistor allows, in addition with the capacitor C, the spark frequency to be adjusted
and the current from the mains to be limited. Its value shall allow the thyristor Th to fire even
in the worst case. In this case the system must fire with the lower RMS mains voltage value
while the breakdown voltage and current of the FLC are at the maximum.
The maximum Rs value is equal to:
(V
AC
min
⋅
2)
–
[
V
BO
max
⋅ (
1 +
αT ⋅ (
T
amb
–
25
) ) ]
Rsmax
= ----------------------------------------------------------------------------------------------------------------------------------------
k
⋅
I
BO
(
1
)
(1) See
Figure 4
Figure 6. Spark frequency versus RS and C
F (Hz)
20
C=0
.47
μ
F
Vac=220Vrms, Vbo=225V, Tamb=25°C
10
5
C=3
C=1
C=1
C=2
.2
μ
F
C=2
.7
μ
F
.3
μ
F
.5
μ
F
μ
F
3
2
1
4.7
6.8
10
12
Rs (k
Ω
)
15
18
22
27 30
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.
4/11
DocID3616 Rev 7
FLC01
Characteristics
The next curve on the next page shows the behavior with RS = 15 kΩ and C = 1 µF.
Figure 7. Voltage across the capacitance with Rs = Rs 15 kΩ, C = 1 µF and V
BO
= 225 V
Peak current limit
This component is designed to withstand I
TRM
= 190 A for a pulse duration of 10 µs for an
ambient temperature of 120° C in repetitive surge. The curve of peak current versus the
pulse duration allows us to verify if the application is within the FLC operating limit.
Figure 8. Peak current limit versus pulse duration
ITRM(A)
250
200
150
100
50
5.0
Tj max=120°C
7.5
10.0
tp (µs)
12.5
15.0
Power losses (for 10 µs, see
Figure 3)
To evaluate the power losses, please use the following equations:
–
–
For the thyristor: P = 1.18 x I
T(AV)
+ 0.035 I
2T(RMS)
For the diode: P = 0.67 x I
F(AV)
+ 0.106 I
2F(RMS)
DocID3616 Rev 7
5/11
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