FLC21 FAMILY
Application Specific Discretes
A.S.D.
FEATURES
n DEDICATED THYRISTOR STRUCTURE FOR
CAPACITIVE DISCHARGE IGNITION
OPERATION
n HIGH PULSE CURRENT CAPABILITY
I
= 90A @ tp = 10µS
FRM
n AC OR DC OPERATION CAPABILITY WITH
SUPPLY FROM THE AC MAINS OR A DC
BATTERY.
BENEFITS
n SPACE SAVING THANKS TO MONOLITHIC
FUNCTION INTEGRATION
n HIGH R ELIABILI TY WIT H PLANAR
TECHNOLOGY
DESCRIPTION
The FLC21 serieshavebeen developed especially
for capacitance discharge operation. The main
applications are: fuel ignitor, fuel or gas heater,
gas range, cook top, barbecue, water heater,
HVAC, portable ignitor, insect killers.
It uses a high performance planar diffused
technology device adapted tohigh temperature in
rugged environmental conditions.
The typical supply ofthe FLC21 fire lightercircuit is
a DC battery or the AC mains.
TM
FIRE LIGHTER CIRCUIT
1
2
3
TO92
(Plastic)
FUNCTIONAL DIAGRAM
pin 3
Z
R
LOW POWER
Th
D
Th: Thyristor for the switching operation.
Z: Zener diode to setthe ignitingthresholdvoltage.
D: Diode for the reverse conduction.
R: 2kΩresistor.
DEVICE
TYPE
FLC21-135A BATTERY
APPLICATION MODE
Ignition
OPERATION
FLC21-65A 100V Mains Ignition
Jun 2000- Ed:4D
pin 1
pin 2 not connected
1/6
FLC21 FAMILY
ABSOLUTE RATINGS (limiting values)
Symbol Parameter Value Unit
I
TRM
I
FRM
dI/dt
Tstg
Tj
Tamb Operating temperature range - 30 to + 120 °C
T
L
Note 1 : Test current waveform
Repetitive surgepeak on state current for thyristor
-30°C ≤ Tamb ≤ 120°C
tp =10µs
( note 1)
90 A
Repetitive surgepeak on state current for diode
-30°C ≤ Tamb ≤ 120°C
Critical rate ofrise on state current -30°C≤ Tamb ≤ 120°C
Storage junction temperature range
Maximum junctiontemperature
50 A/µs
- 40 to + 150
125
Maximum leadtemperature for soldering during 10s 260 °C
°C
10µs
100ms
THERMAL RESISTANCE
Symbol Parameter Value Unit
Rth(j-a) Junctionto ambient 150 °C/W
ORDERING INFORMATION
FLC 2 1 135 A-
PACKAGEA: TO92
FIRE LIGHTER CIRCUIT
135: V = 135V
ITRM = 90A
RM
65: V = 65V
RM
2/6
CIRCUIT NUMBER:
SCR + diode + Zener + Resistance
FLC21 FAMILY
ELECTRICAL CHARACTERISTICS
Symbol Parameters
V
RM
V
BO
V
T
V
F
I
BO
I
RM
Stand-off voltage
Breakover voltage
On-state voltage
Diode forward voltage drop
Breakover current
Leakage current
αT Temperature coefficient for V
BO
V
BO
V
RM
I
I
F
V
T
I
RM
I
BO
I
T
V
F
DIODE (D) PARAMETER
Symbol Test Conditions Value Unit
V
F
IF=1A tp≤500µsTj=25°C Max. 1.7 V
THYRISTOR (Th) and ZENER (Z) PARAMETERS
Value
Symbol Test conditions
Min. Typ. Max. Min. Typ. Max.
I
RM
V
BO
I
BO
V
T
VRM= 65V for FLC21-65A Tj = 25°C11µA
V
= 135V for FLC21-135A
RM
at I
BO
at V
BO
Tj = 125°C1010µA
Tj = 25°C 70 80 140 160 V
Tj = 25°C 500 500 µA
IT=2A tp≤500µsTj=25°C 1.7 1.7 V
αT 0.07 0.16 V/°C
V
UnitFLC21-65A FLC21-135A
Fig.1: Relative variation of breakover current
versus junction temperature.
k = I (Tj) / I (25°C)BO BO
2.5
2
1.5
1
0.5
0
-200 20406080100
Tj (°C)
3/6
FLC21 FAMILY
Fig. 2: BASIC AC MAINS APPLICATION
Ic
S
1
AC
MAINS
Rs
Fig. 3: BASIC DC APPLICATION
S1
DC/AC
Oscillator
Ds
Ds
Rs
Ic
t
c
Th
Z
D
R
Ic
Ic
t
c
1/ IGNITION MODE
PHASE 1
The AC voltage is rectified by the diode Ds.
The ignition energy is supplied by the mains
and stored into the capacitor C.
4/6
Th
Z
D
R
PHASE 2
At the end of the phase 1, the voltage across the
capacitor C reaches the avalanche threshold of
the Zener diode Z. Then, a current flows through
this Zener diode into the gate of the thyristor Th
which is triggered.
The thyristor turn on generates an alternating
current through the capacitor C. Its positive parts
flow throughthe capacitor C, the primary ofthe HV
transformer and the thyristor Th. Its negative parts
of the current flowthrough C, D and the primary of
the H.V transformer.
FLC21 FAMILY
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
The maximum Rs value isequal to:
Rs
max
( min. ) [ max .( .( ))]
AC BO amb
=
−+−2125α
kI
.*
BO
VVTT
* : see fig 1
Fig. 4: Spark frequency versus Rs and C
F (Hz)
50
30
20
10
10 12 15 18 22 27 33 39 47
FLC21-65A
Rs (k )Ω
Vac=100Vrms, Vbo=75V,Tamb=25°C
C=1 F
C=1 F
µ
µ
C=1.5 F
C=1.5 F
µ
µ
C=2.2 F
µ
C=2.7 F
µ
C=3.3 F
µ
requested cases. In worst cases, the system must
fire when thea.c. line voltage is minimum while the
breakdown voltage VBOand the current IBOof the
FLC aremaximum.
F (Hz)
50
30
20
10
10 12 15 18 22 27 33 39 47
FLC21-135A
Ω
Rs (k )
Vdc=300V, Vbo=150V,Tamb=25°C
C=1
C=1
µ
µ
F
F
C=1.5
C=1.5
µ
µ
F
F
C=2.2
µ
F
C=2.7 F
µ
C=3.3
µ
F
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.
5/6
FLC21 FAMILY
PACKAGE MECHANICAL DATA
TO92 (Plastic)
DIMENSIONS
REF.
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 1.35 0.053
a
B 4.70 0.185
BAC
C 2.54 0.100
D 4.40 0.173
F
D
E
E 12.70 0.500
F 3.70 0.146
a 0.45 0.017
n Epoxy meets UL94, VO at1/8”
Type Marking Package Weight Base qty Delivery mode
FLC21- 65A
FLC21-65A TO-92 0.200g 2500 Bulk
FLC21-135A FLC21-135A TO-92 0.200g 2500 Bulk
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