STMICROELECTRONICS FLC21

FLC21 FAMILY

Application Specific Discretes
A.S.D.TM
LOW POWER
FIRE LIGHTER CIRCUIT
FEATURES
n
n
n
DEDICATED THYRISTOR STRUCTURE FOR
CAPACITIVE
DISCHARGE
IGNITION
OPERATION
HIGH PULSE CURRENT CAPABILITY
IFRM = 90A @ tp = 10µS
AC OR DC OPERATION CAPABILITY WITH
SUPPLY FROM THE AC MAINS OR A DC
BATTERY.
1
2
3
BENEFITS
n
n
TO92
(Plastic)
SPACE SAVING THANKS TO MONOLITHIC
FUNCTION INTEGRATION
HI G H RELIABI LI TY WI TH PLANAR
TECHNOLOGY
FUNCTIONAL DIAGRAM
DESCRIPTION
pin 3
The FLC21 series have been 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 to high temperature in
rugged environmental conditions.
The typical supply of the FLC21 fire lighter circuit is
a DC battery or the AC mains.
Z
Th
D
R
pin 1
Th: Thyristor for the switching operation.
Z: Zener diode to set the igniting threshold voltage.
D: Diode for the reverse conduction.
R: 2 kΩ resistor.
DEVICE
TYPE
APPLICATION
MODE
FLC21-135A
BATTERY
OPERATION
Ignition
FLC21-65A
100V Mains
Ignition
Jun 2000 - Ed: 4D
pin 2 not connected
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FLC21 FAMILY
ABSOLUTE RATINGS (limiting values)
Symbol
Parameter
Value
Unit
90
A
50
A/µs
ITRM
Repetitive surge peak on state current for thyristor
-30°C ≤ Tamb ≤ 120°C
IFRM
Repetitive surge peak on state current for diode
-30°C ≤ Tamb ≤ 120°C
dI/dt
Critical rate of rise on state current -30°C ≤ Tamb ≤ 120°C
Tstg
Tj
Storage junction temperature range
Maximum junction temperature
- 40 to + 150
125
°C
Operating temperature range
- 30 to + 120
°C
260
°C
Tamb
TL
tp = 10µs
( note 1)
Maximum lead temperature for soldering during 10s
Note 1 : Test current waveform
10µs
100ms
THERMAL RESISTANCE
Symbol
Rth(j-a)
Parameter
Junction to ambient
Value
Unit
150
°C/W
ORDERING INFORMATION
FLC
2 1 -
135
A
PACKAGE A: TO92
FIRE LIGHTER CIRCUIT
ITRM = 90A
135: VRM = 135V
65: VRM = 65V
CIRCUIT NUMBER:
SCR + diode + Zener + Resistance
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FLC21 FAMILY
I
IF
ELECTRICAL CHARACTERISTICS
Symbol
Parameters
VRM
Stand-off voltage
VBO
Breakover voltage
V
BO
VT
On-state voltage
VF
Diode forward voltage drop
IBO
Breakover current
IRM
Leakage current
αT
Temperature coefficient for VBO
V
T
VRM
VF
V
IRM
I BO
IT
DIODE (D) PARAMETER
Symbol
VF
Test Conditions
IF = 1A
tp ≤ 500µs
Tj = 25°C
Max.
Value
Unit
1.7
V
THYRISTOR (Th) and ZENER (Z) PARAMETERS
Value
Symbol
Test conditions
FLC21-65A
Min.
FLC21-135A
Unit
Typ. Max. Min. Typ. Max.
VRM = 65V for FLC21-65A
Tj = 25°C
1
1
µA
VRM = 135V for FLC21-135A
Tj = 125°C
10
10
µA
VBO
at IBO
Tj = 25°C
160
V
IBO
at VBO
Tj = 25°C
500
500
µA
VT
IT = 2A
Tj = 25°C
1.7
1.7
V
IRM
tp ≤ 500µs
αT
70
80
0.07
140
0.16
V/°C
Fig.1: Relative variation of breakover current
versus junction temperature.
k = IBO(Tj) / IBO(25°C)
2.5
2
1.5
1
0.5
0
-20
0
20
40
60
80
100
Tj (°C)
3/6
FLC21 FAMILY
Fig. 2: BASIC AC MAINS APPLICATION
Ic
Ic
t
S1
Rs
c
Ds
Th
Z
AC
D
MAINS
R
Fig. 3: BASIC DC APPLICATION
Ic
Ic
t
Ds
S1
c
Rs
DC/AC
Oscillator
Th
Z
D
R
1/ IGNITION MODE
PHASE 2
PHASE 1
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 through the capacitor C, the primary of the HV
transformer and the thyristor Th. Its negative parts
of the current flow through C, D and the primary of
the H.V transformer.
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
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
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 max =
(V AC min. 2 ) − [V BO max .(1 + α T .( T amb − 25 ))]
k . I BO *
* : see fig 1
Fig. 4: Spark frequency versus Rs and C
FLC21-65A
F (Hz)
50
C=1
.5µF
C=1
µF
C=1
.5µF
30
C=2
.2µF
C=2
.7µF
20
Vdc=300V, Vbo=150V, Tamb=25°C
50
C=1
µF
30
FLC21-135A
F (Hz)
Vac=100Vrms, Vbo=75V, Tamb=25°C
C=2
.2µF
C=2
20
.7µF
C=3
.3µF
C=3
.3µ
F
10
10
10
12
15
18
22
27
33
39
47
Rs (k Ω )
10
12
15
18
22
27
33
39
47
Rs (k Ω )
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
Min.
Inches
Typ. Max. Min.
Typ. Max.
1.35
0.053
A
a
A
B
B
C
C
F
n
4.70
D
E
0.185
2.54
0.100
D
4.40
0.173
E
12.70
0.500
F
3.70
0.146
a
0.45
0.017
Epoxy meets UL94, VO at 1/8”
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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change without notice. This publication supersedes and replaces all information previously supplied.
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