FLC01-200D Application Specific Discretes A.S.D.TM FIRE LIGHTER CIRCUIT FEATURES SPACE SAVING : MONOLITHIC FIRE LIGHTER FUNCTION INTEGRATION DEDICATED THYRISTOR STRUCTURE FOR CAPACITANCE DISCHARGE IGNITION OPERATION HIGH PULSE CURRENT CAPABILITY 190A @ tp = 10µs 1 2 3 SOT82 (Plastic) DESCRIPTION - FUNCTIONAL DIAGRAM The FLC01 is a high performance planar diffused technology adapted to high temperature and rugged environmental conditions. It has been developed especially for capacitance discharge operation. The main applications are gas lighter or ignitor such as : cookers / gas boilers / gas hobs... Th : Thyristor for switching operation. Z : Zener diode to set the threshold voltage. D : Diode for reverse conduction. R : 2 kΩ resistor. October 1999 Ed: 3A 1/7 FLC01-200D ABSOLUTE RATINGS (limiting values) : -30°C < Tamb < 120°C Symbol Parameter ITRM Repetitive surge peak on state current for thyristor IFRM Repetitive surge peak on state current for diode di/dt Critical rate of rise time on state current Tstg Tj Storage junction temperature range Maximum junction temperature Toper TL Value Unit 190 A 120 A/µs - 40 to + 150 + 125 °C -30 + 120 °C 260 °C tp = 10µs ( note 1) Operating temperature range Maximum lead temperature for soldering during 10s Note 1 : Test current waveform m THERMAL RESISTANCE Symbol Rth(j-a) Parameter Thermal resistance junction to ambient Value Unit 100 °C/W ORDERING INFORMATION FLC 01 - 200 D FIRE LIGHTER CIRCUIT PACKAGE D : SOT82 VRM 200 = 200 V CIRCUIT NUMBER : 01 = scr + diode + zener + resistance (pin 3 not connected) 2/7 FLC01-200D ELECTRICAL CHARACTERISTICS Symbol I IF Parameters VRM Stand-off voltage VBO Breakover voltage V BO VRM V T VF VT On-state voltage VF Diode voltage drop IRM IBO Breakover current I BO IRM Leakage current αT Thermal coefficient for VBO V IT DIODE (D) PARAMETER Symbol Test Conditions VF tp ≤ 1 ms IF = 2A Tj = 25°C MAX Value Unit 1.7 V THYRISTOR (Th) and ZENER (Z) PARAMETERS Symbol Test conditions IRM VRM = 200 V Min Max Unit Tj = 25°C 1 µA Tj = 125°C 10 µA 233 V VBO at IBO Tj = 25°C IBO at VBO Tj = 25°C 0.5 mA VT IT = 2A Tj = 25°C 1.7 V tp ≤ 1ms αT 206 Typ 220 0.27 V/°C Fig.1 : Relative variation of breakover current (IBO) 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) 3/7 FLC01-200D BASIC APPLICATION Ic Ic t Rs c Ds Th AC Z MAINS D R The applications of the lighter using the capacitance discharge topology operate in 2 phases : PHASE 1 The positive parts of this current flow through C, Th and the primary of the HV transformer. The negative parts of the current flow through C, D and the primaty of the HV transformer. The energy coming from the mains is stored into the capacitor C. For that, the AC voltage is rectified by the diode Ds. RS RESISTOR CALCULATION PHASE 2 The Rs resistor allows, in addition with the capacitor C, to adjust the spark frequency and to limitate the current from the mains. Its value shall allow the thyristor Th to fire even in the worst case. In this borderline case the system must fire with the lower RMS mains voltage value while the breakdown voltage and current of the FLC are at the maximum. At the end of the phase 1, the voltage across the capacitor C reachesthe avalanche threshold of the zener. Then a current flows through the gate of the thyristor Th which fires. The firing of the thyristor causes an alternating current to flow through the capacitor C. The maximum Rs value is equal to : Rsmax = 2 ) − [VBO max .(1 + α T.( Tamb − 25 ))] (VAC min.√ k . IBO ∗ * : see fig 1 4/7 FLC01-200D Fig. 2 : Spark frequency versus Rs and C F (Hz) Vac=220Vrms, Vbo=225V, Tamb=25°C 20 C=0 .47µ F C=1 10 C=1 .5µ C=2 C=2 µF F .2µ F .7 µF 5 C=3 .3µF 3 2 1 4.7 6.8 10 12 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 15 18 22 27 30 mains is minimum. The next curve shows the behavior with Rs=15kΩ and C=1µF. Fig. 3 : Voltage across the capacitance with Rs = 15kΩ, C = 1µF and VBO = 225V. 5/7 FLC01-200D PEAK CURRENT LIMIT T his co mpon en t is d es ig ned t o withs t an d ITRM = 150A for a pulse duration of 10µs for an ambient temperature of 120°C in repetitive surge. The curve of peak current versus the pulse duration allows us to verify if the application is within the FLC operating limit. Fig. 4 : Peak current limit ITRM (A) Tjmax =125°C 190 180 170 160 150 140 130 120 110 6 8 10 tp (µs) POWER LOSSES (For 10µs, see note 1) To evaluate the power losses, please use the following equations : For the thyristor : P = 1.18 x IT(AV) + 0.035 I 2T(RMS) For the diode : P = 0.67 x IF(AV) + 0.106 I2F(RMS) 6/7 12 14 FLC01-200D PACKAGE MECHANICAL DATA SOT82 (Plastic) DIMENSIONS REF. A Max. Min. Max. A 7.4 7.8 0.291 0.307 B 10.5 10.8 0.413 0.425 b 0.7 0.9 0.395 0.035 b1 0.49 0.75 0.019 0.029 C 2.4 2.7 0.094 0.106 c1 1.0 1.3 0.039 0.051 D 15.4 16.0 0.606 0.630 B I c1 H2 H e e3 F D 4.15 4.65 3.8 typ. O 0.086 typ. 0.163 0.183 0.149 typ. 2.54 0.100 H2 2.15 typ. 0.084 typ. I 1.27 typ. 0.05 typ. O 0.3 typ. 0.012 typ. V 10° 10° e b1 2.2 typ. H V e3 Inches Min. C F Millimeters b Marking : type number Weight : 0.72 g. 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 infringementof 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 1999 STMicroelectronics - Printed in Italy - All rights reserved. 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