FLC01-200D

® FLC01-200D FIRE LIGHTER CIRCUIT Application Specific Discretes A.S.D.TM 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 ITRM IFRM di/dt Tstg Tj Toper TL Parameter Repetitive surge peak on state current for thyristor Repetitive surge peak on state current for diode Critical rate of rise time on state current Storage junction temperature range Maximum junction temperature Operating temperature range Maximum lead temperature for soldering during 10s tp = 10µs ( note 1) 120 - 40 to + 150 + 125 -30 + 120 260 A/µs °C °C °C Value 190 Unit A Note 1 : Test current waveform m THERMAL RESISTANCE Symbol Rth(j-a) Parameter Thermal resistance junction to ambient Value 100 Unit °C/W ORDERING INFORMATION FLC FIRE LIGHTER CIRCUIT 01 - 200 D 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 VRM VBO VT VF IBO IRM αT Parameters Stand-off voltage Breakover voltage On-state voltage Diode voltage drop Breakover current Leakage current Thermal coefficient for VBO IT V BO VRM V T VF IRM I BO V I IF DIODE (D) PARAMETER Symbol VF IF = 2A Test Conditions tp ≤ 1 ms Tj = 25°C MAX Value 1.7 Unit V THYRISTOR (Th) and ZENER (Z) PARAMETERS Symbol IRM VBO IBO VT αT VRM = 200 V at IBO at VBO IT = 2A tp ≤ 1ms Test conditions Tj = 25°C Tj = 125 °C Tj = 25°C Tj = 25°C Tj = 25°C 0.27 206 220 Min Typ Max 1 10 233 0.5 1.7 Unit µA µA V mA V V/°C Fig.1 : Relative variation of breakover current (IBO) versus junction temperature 2.5 2 1.5 1 0.5 0 k = IBO(Tj) / IBO(25 °C) -20 0 20 40 60 80 100 Tj (°C) 3/7 FLC01-200D BASIC APPLICATION Ic Ic t Rs Ds c Th AC Z D MAINS R The applications of the lighter using the capacitance discharge topology operate in 2 phases : PHASE 1 The energy coming from the mains is stored into the capacitor C. For that, the AC voltage is rectified by the diode Ds. PHASE 2 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 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. RS RESISTOR CALCULATION 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. The maximum Rs value is equal to : Rsmax =   (VAC min.√2 ) − [VBO max .(1 + α T.( Tamb − 25 ))] k . IBO ∗ * : see fig 1 4/7 FLC01-200D Fig. 2 : Spark frequency versus Rs and C F (Hz) 20 10 5 Vac=220Vrms, Vbo=225V, Tamb=25°C C=0 C=1 C=1 C=2 C=3 .3µF C=2 .7 µF .2µ F .5µ F µF .47µ F 3 2 1 4.7 6.8 10 12 Rs (k Ω ) 15 18 22 27 30 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. 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 Fig. 4 : Peak current limit 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. ITRM (A) 190 180 170 160 150 140 130 120 110 6 8 10 tp (µs) 12 Tjmax =125°C 14 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 FLC01-200D PACKAGE MECHANICAL DATA SOT82 (Plastic) DIMENSIONS REF. Millimeters Min. A A F B C Inches Min. 0.291 0.413 0.395 0.019 0.094 0.039 0.606 Max. 0.307 0.425 0.035 0.029 0.106 0.051 0.630 Max. 7.8 10.8 0.9 0.75 2.7 1.3 16.0 7.4 10.5 0.7 0.49 2.4 1.0 15.4 B b b1 C c1 H2 c1 I H D e e3 2.2 typ. 4.15 4.65 0.086 typ. 0.163 0.183 D V F H H2 e e3 b1 O b 3.8 typ. 2.54 2.15 typ. 1.27 typ. 0.3 typ. 10° 0.149 typ. 0.100 0.084 typ. 0.05 typ. 0.012 typ. 10° I O V 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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