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| (R) FLC21 FAMILY LOW POWER FIRE LIGHTER CIRCUIT Application Specific Discretes A.S.D.TM FEATURES n n n DEDICATED THYRISTOR STRUCTURE FOR CAPACITIVE DISCHARGE IGNITION OPERATION HIGH PULSE CURRENT CAPABILITY IFRM = 90A @ tp = 10S AC OR DC OPERATION CAPABILITY WITH SUPPLY FROM THE AC MAINS OR A DC BATTERY. 1 2 3 BENEFITS n n SPACE SAVING THANKS TO MONOLITHIC FUNCTION INTEGRATION HI G H RELIABI LI TY WI TH PLANAR TECHNOLOGY TO92 (Plastic) FUNCTIONAL DIAGRAM DESCRIPTION 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. Th: Thyristor for the switching operation. Z: Zener diode to set the igniting threshold voltage. D: Diode for the reverse conduction. R: 2 k resistor. DEVICE TYPE FLC21-135A FLC21-65A pin 3 Z Th D R pin 1 pin 2 not connected APPLICATION BATTERY OPERATION 100V Mains MODE Ignition Ignition Jun 2000 - Ed: 4D 1/6 FLC21 FAMILY ABSOLUTE RATINGS (limiting values) Symbol ITRM IFRM dI/dt Tstg Tj Tamb TL Parameter Repetitive surge peak on state current for thyristor -30C Tamb 120C Repetitive surge peak on state current for diode -30C Tamb 120C Critical rate of rise on state current -30C Tamb 120C Storage junction temperature range Maximum junction temperature Operating temperature range Maximum lead temperature for soldering during 10s 50 - 40 to + 150 125 - 30 to + 120 260 A/s C C C tp = 10s ( note 1) Value 90 Unit A Note 1 : Test current waveform 10s 100ms THERMAL RESISTANCE Symbol Rth(j-a) Junction to ambient Parameter Value 150 Unit C/W ORDERING INFORMATION FLC FIRE LIGHTER CIRCUIT ITRM = 90A 21- 135 A PACKAGE A: TO92 135: VRM = 135V 65: VRM = 65V CIRCUIT NUMBER: SCR + diode + Zener + Resistance 2/6 FLC21 FAMILY ELECTRICAL CHARACTERISTICS Symbol VRM VBO VT VF IBO IRM T Parameters Stand-off voltage Breakover voltage On-state voltage Diode forward voltage drop Breakover current Leakage current Temperature coefficient for VBO IT V BO VRM V T VF IRM I BO V I IF DIODE (D) PARAMETER Symbol VF IF = 1A Test Conditions tp 500s Tj = 25C Max. Value 1.7 Unit V THYRISTOR (Th) and ZENER (Z) PARAMETERS Value Symbol IRM VBO IBO VT T Fig.1: Relative variation of breakover current versus junction temperature. k = IBO(Tj) / IBO(25C) 2.5 2 1.5 1 0.5 0 Test conditions VRM = 65V for FLC21-65A VRM = 135V for FLC21-135A at IBO at VBO IT = 2A tp 500s Tj = 25C Tj = 125C Tj = 25C Tj = 25C Tj = 25C FLC21-65A Min. 1 10 70 80 500 1.7 0.07 FLC21-135A 1 10 140 160 500 1.7 0.16 Unit A A V A V V/C Typ. Max. Min. Typ. Max. -20 0 20 40 60 80 100 Tj (C) 3/6 FLC21 FAMILY Fig. 2: BASIC AC MAINS APPLICATION Ic Ic t S1 Rs Ds c Th AC Z D R MAINS Fig. 3: BASIC DC APPLICATION Ic Ic t S1 DC/AC Oscillator Ds Rs c Th Z D R 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. 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 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. 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 + T .( T amb - 25 ))] k . I BO * * : see fig 1 Fig. 4: Spark frequency versus Rs and C FLC21-65A F (Hz) 50 Vac=100Vrms, Vbo=75V, Tamb=25C C=1 F C=1 .5F C=2 .2F C=2 .7F C=3 .3F F (Hz) 50 FLC21-135A Vdc=300V Vbo=150V Tamb=25C , , C=1 F C=1 .5F C=2 .2F 30 20 30 20 C=3 C=2 .7F .3 F 10 10 10 12 15 18 22 27 33 39 47 10 12 15 18 22 27 33 39 47 Rs (k ) Rs (k ) 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. A a B C Millimeters Min. Typ. Max. Min. 1.35 4.70 2.54 4.40 12.70 3.70 0.45 0.173 0.500 Inches Typ. Max. 0.053 0.185 0.100 A B C D F D E E F a 0.146 0.017 n Epoxy meets UL94, VO at 1/8" Type FLC21- 65A FLC21-135A Marking FLC21-65A FLC21-135A Package TO-92 TO-92 Weight 0.200g 0.200g Base qty 2500 2500 Delivery mode Bulk Bulk Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of 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. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 2000 STMicroelectronics - Printed in Italy - All rights reserved. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com 6/6 |
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