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| (R) FLC02-200D 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 150A @ tp = 10s 1 2 3 SOT82 (Plastic) DESCRIPTION FUNCTIONAL DIAGRAM - The FLC02 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 ignitor circuits such as : fuel ignitiors / gas boilers... pin 2 Z Th : Thyristor for switching operation. Z : Zener diode to set the threshold voltage. D : Diode for reverse conduction. R : 2 kOhm resistor. pin 3 Th R D pin 1 February 1996 1/7 FLC02-200D ABSOLUTE RATINGS (limiting values) : 0C < Tamb < 90C Symbol ITRM IFRM ITSM di/dt Tstg Tj Toper TL Parameter Repetitive surge peak on state current for thyristor Repetitive surge peak on state current for diode Non repetitive surge peak on state current 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 = 10s ( note 1) tp = 10ms 5 120 - 40 to + 150 + 125 0 + 90 260 A A/s C C C Value 150 Unit A Note 1 : Test current waveform 10s 200ms THERMAL RESISTANCE Symbol Rth(j-a) Parameter Thermal resistance junction to ambient Value 100 Unit C/W ORDERING INFORMATION FLC FIRE LIGHTER CIRCUIT 02 - 200 D PACKAGE D : SOT82 VRM 200 = 200 V CIRCUIT NUMBER : 02 = scr + diode + zener + resistance (gate connected to pin 3) 2/7 (R) FLC02-200D ELECTRICAL CHARACTERISTICS Symbol VRM VBO VT VF IRM IBO Parameters Stand-off voltage Breakover voltage On-state voltage drop Diode voltage drop Leakage current Breakover current VBO VRM V T I RM I BO 1 I BO 2 IT VF V I IF DIODE (D) PARAMETER Symbol VF IF = 2A tp 1 ms Test Conditions Tj = 25C MAX Value 1.7 Unit V THYRISTOR (Th) and ZENER (Z) PARAMETERS Symbol IRM VRM = 200 V Test conditions Tj = 25C Tj = 120C VBO IBO 1 IBO 2 VT at IBO1 at VBO at VBO IT = 2A Pin 3 (gate) open Pin 3 (gate) open Pin 1 (cathode)and pin 3 (gate) in c/c tp 1ms Tj = 25C Tj = 25C Tj = 25C Tj = 25C MAX MAX MAX MAX MIN MAX Value 10 100 250 0.5 40 1.7 Unit A A V mA mA V Fig.1 : Relative variation of breakover current (IBO) versus junction temperature Ibo (Tj) / Ibo (25C ) 1.4 1.2 IbO2 1 IbO1 0.8 0.6 0.4 0 20 40 Tj (C) (R) 60 80 3/7 FLC02-200D BASIC APPLICATION Ic Ic t Rs Ds c Th AC MAINS Sensor Z T R D The applications of the FLC02 using the capacitance discharge topology operate in 2 modes : - Ignition mode : Transistor T is OFF - Blanking mode : Transistor T is ON 1) IGNITION MODE (Transistor TOFF) PHASE 1: The energy coming from the mains is stored into the capacitorC. 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 reaches the 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 negativeparts of the current flow through C, D and the primary 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 = 2 (VAC min x ) - VBO max IBO1 max 4/7 (R) FLC02-200D Fig 2. : Spark frequency versus Rs and C F (Hz) 20 C=0.47 F 10 C=1. C=3. C=2. 7 F C=2. 2 F 5 F C=1 F 5 3 2 6 3 F 11 Rs (kOh ms ) 16 21 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=15kOhms and C=1F. Fig. 3 : Voltage across the capacitance with Rs = 15 kOhms and C = 1F 5/7 (R) FLC02-200D PEAK CURRENT LIMIT This compo nen t is des ig ne d to wit h st and Ip = 150A for a pulse duration of 10s for an ambient temperature of 90C. Fig. 4 : Peak current limit The curve of peak current versus the pulse duration allows us to verify if the application is within the FLC operating limit. Ip (A) 190 180 170 160 150 140 130 120 110 6 8 t (s) POWER LOSSES (For 10s, see note 1) To evaluate the power losses, please use the following equations : For the thyristor : P = 1.18 x IT(AV) + 0.035 I2T(RMS) For the diode : P = 0.67 x IF(AV) + 0.106 I2F(RMS) 2/ BLANKING MODE (Transistor TON) In this mode and transistor T is saturated and stops the spark generation. 10 12 14 In order to keep the thyristor Th in blanking mode and because of the power dissipation, the Resistor (Rs) has to keep a minimum value of 22 k (see next curve) : Rs (kohms) 100 80 60 40 Rs max Rs min 20 0 0 20 40 60 Tamb (C) 80 100 120 Vac = 220V +15% -10% 6/7 (R) FLC02-200D PACKAGE MECHANICAL DATA SOT82 (Plastic) C A REF. Min. DIMENSIONS Millimeters Max. 7.8 10.8 2.7 0.9 2.2 typ. 0.49 4.15 0.75 4.65 2.54 15.7 typ. 1.0 1.3 Inches Min. 0.291 0.413 0.094 0.027 Max. 0.307 0.425 0.106 0.035 B A B C 7.4 10.5 2.4 0.7 H D E 0.087 typ. 0.019 0.163 0.029 0.183 0.100 0.618 typ. 0.039 0.051 L F G D M F E G H (1) L M (1) Within this region the cross-section of the leads is uncontrolled Marking type number Weight : 0.72 g. Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability 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 SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSO N Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1996 SGS-THOMSON Microelectronics - Printed in Italy - All rights reserved. SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 7/7 (R) |
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