STMICROELECTRONICS FLC21-135A

FLC21-135A
®
Application Specific Discretes
A.S.D.™
LOW POWER
FIRE LIGHTER CIRCUIT
FEATURES
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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
FAST TURN-ON OPERATION
DESIGNED
FOR
HIGH
AMBIENT
TEMPERATURE (up to 120°C)
1
2
3
TO-92
(Plastic)
BENEFITS
■
■
SPACE SAVING THANKS TO MONOLITHIC
FUNCTION INTEGRATION
HIGH RELIABILITY WITH PLANAR
TECHNOLOGY
FUNCTIONAL DIAGRAM
pin 3
DESCRIPTION
Z
The FLC21-135A has been especially developed
for capacitance discharge operation. The main
applications are: fuel ignitors, fuel or gas heaters,
gas ranges, cooker tops, barbecues, water
heaters, HVACs, portable ignitors, insect killers.
Based on ST’s ASD™ technology, it provides a
fully integrated function, with high performance
and reliability levels, adapted to severe and hot
temperature environment.
The typical supply of the FLC21-135A fire lighter
circuit is a DC battery or the AC mains.
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.
July 2003 - Ed: 6D
Th
D
R
pin 1
pin 2 not connected
DEVICE
TYPE
FLC21-135A
APPLICATION
BATTERY
OPERATION
MODE
Ignition
1/6
FLC21-135A
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
CIRCUIT NUMBER:
SCR + diode + Zener + Resistance
2/6
FLC21-135A
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
tp ≤ 500µs
IF = 1A
Tj = 25°C
Value
Unit
1.7
V
Max.
THYRISTOR (Th) and ZENER (Z) PARAMETERS
Value
Symbol
Test conditions
FLC21-135A
Min.
IRM
VRM = 135V
Typ.
Unit
Max.
Tj = 25°C
1
µA
Tj = 125°C
10
µA
160
V
VBO
at IBO
Tj = 25°C
IBO
at VBO
Tj = 25°C
500
µA
VT
IT = 2A
Tj = 25°C
1.7
V
tp ≤ 500µs
αT
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
FLC21-135A
Fig. 2: BASIC AC MAINS APPLICATION.
Ic
Ic
t
S1
c
Ds
Rs
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
FLC21-135A
RS RESISTANCE CALCULATION
The Rs resistance allows, in addition with the
capacitance C, the spark frequency to be adjusted
and the current supplied by the mains to be limited.
This resistance allows the thyristor triggering in
any requested cases. In the worst case scenario,
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 .( Tamb − 25 ))]
k . I BO *
* : see fig 1
Fig. 4: Spark frequency versus Rs and C.
FLC21-135A
F (Hz)
Vdc=300V, Vbo=150V, Tamb=25°C
50
C=1
µF
C=1
.5µF
30
C=2
.2µF
C=2
20
.7µF
C=3
.3µF
10
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
FLC21-135A
PACKAGE MECHANICAL DATA
TO-92 (Plastic)
DIMENSIONS
REF.
Millimeters
Min.
A
a
A
Typ. Max. Min.
Typ. Max.
1.35
0.053
B
B
C
4.70
C
F
D
E
Inches
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
OTHER INFORMATION
■
Type
Marking
Package
Weight
Base qty
Delivery mode
FLC21-135A
FLC21-135A
TO-92
0.20 g
2500
Bulk
Epoxy meets UL94, VO at 1/8"
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use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by
implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to
change without notice. This publication supersedes and replaces all information previously supplied.
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© 2003 STMicroelectronics - Printed in Italy - All rights reserved.
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