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FLC21-135A ,LOW POWER FIRE LIGHTER CIRCUITFEATURESn DEDICATED THYRISTOR STRUCTURE FORCAPACITIVE DISCHARGE IGNITIONOPERATIONn HIGH PULSE CURRE ..
FLI2301 , Digital Video Format Converter
FLI2301 , Digital Video Format Converter
FLI2301 , Digital Video Format Converter
FLI30602H-AC , Single-chip analog TV processor
FT500A , Phase Control SCR 400 Amperes Avg 800-2500 Volts
FT5754M ,Silicon Darlington Transistor Array.
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FT5757M ,Silicon Darlington Transistor Array.
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January 1990
Edition 1.1
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January 1990
Edition 1.1
PRODUCT PROFILE
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FLC21-135A
LOW POWER FIRE LIGHTER CIRCUIT
Application Specific Discretes
A.S.D.™
FLC21 SeriesLOW POWER
FIRE LIGHTER CIRCUIT
The FLC21 series has been especially developed
for capacitance discharge operation. The main
applications are: fuel ignitors, fuelor gas heaters,
gas ranges, cooker tops, barbecues, water
heaters, HVACs, portable ignitors, insect killers.
Based on ST’s ASD™ technology,it providesa
fully integrated function, with high performance
and reliability levels, adaptedto severe and hot
temperature environment.
The typical supplyof the FLC21 fire lighter circuitis DC batteryor the AC mains.
Th: Thyristorfor the switching operation.
Zener diodeto set the igniting threshold voltage.
Diodefor the reverse conduction.
2kΩ resistor.
DESCRIPTION
FUNCTIONAL DIAGRAM 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 ORA DC
BATTERY FAST TURN-ON OPERATION DESIGNED FOR HIGH AMBIENT
TEMPERATURE (upto 120°C)
FEATURES SPACE SAVING THANKS TO MONOLITHIC
FUNCTION INTEGRATION HIGH RELIABILITY WITH PLANAR
TECHNOLOGY
BENEFITS
FLC21 Series
THERMAL RESISTANCE
ORDERING INFORMATION
Note1: Test current waveform
ABSOLUTE RATINGS (limiting values)
100ms
FLC21 Series
ELECTRICAL CHARACTERISTICS
DIODE (D) PARAMETER
THYRISTOR (Th) and ZENER (Z) PARAMETERS-20 0 20 40 60 80 1000
Tj (°C)
k = I (Tj) / I (25°C)BO BO
Fig.1: Relative variationof breakover current
versus junction temperature.
FLC21 Series
Fig.2: BASIC AC MAINS APPLICATION.
1/ IGNITION MODE
PHASE 1The AC voltageis rectifiedby the diode Ds.
The ignition energyis suppliedby the mains
and stored into the capacitorC.
Fig.3: BASIC DC APPLICATION.
PHASE 2 the endof the phase1, the voltage across the
capacitorC reaches the avalanche thresholdof
the Zener diodeZ. Then,a current flows through
this Zener diode into the gateof the thyristor Th
whichis triggered.
The thyristor turn-on generates an alternating
current through the capacitorC.Its positive parts
flow through the capacitorC, the primaryof the HV
transformer and the thyristor Th.Its negative parts the current flow throughC,D and the primaryof
the H.V transformer.
FLC21 Series RESISTANCE CALCULATIONThe Rs resistance allows,in addition with the
capacitanceC, the spark frequencytobe adjusted
and the current suppliedby the mainstobe limited.
This resistance allows the thyristor triggeringin
any requested cases.In the worst case scenario,
the system must fire when the a.c. line voltageis
minimum while the breakdown voltage VBO and
the current IBOof the FLC are maximum.
The maximum Rs valueis equalto: VV T T BO amb
max ( min. )[ max.( .( ))]= −+ − 25α: seefig1
Fig. 4: Spark frequency versus Rs and C.
The couple Rs/C canbe chosen with the previous
curve. Keepin mind the Rs maximum limit for
which the system would not work when the AC
mainsis minimum.
FLC21 SeriesInformation furnishedis believedtobe accurateandreliable. However,STMicroelectronicsassumesno responsibilityforthe consequencesof
useof suchinformation norfor anyinfringementof patents orother rightsof third parties whichmayresult fromits use.Nolicenseisgrantedby
implicationor otherwise underany patentor patent rightsof STMicroelectronics. Specifications mentionedinthis publicationare subjectto
change without notice. This publication supersedesand replacesall information previously supplied.
STMicroelectronics productsarenot authorizedforuseas critical componentsinlife support devicesor systems without express writtenap-
provalof STMicroelectronics.
TheST logoisa registered trademarkof STMicroelectronics 2000 STMicroelectronics- Printedin Italy-All rights reserved.
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PACKAGE MECHANICAL DATATO-92 (Plastic) Epoxy meets UL94, VOat 1/8"
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