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 1/6 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 2/6 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 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 2000 STMicroelectronics - Printed in Italy - All rights reserved. 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