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SL441C
ADVANCE INFORMATION
DS3848 -1.0
SL441C
ZERO VOLTAGE SWITCH
The SL441C is a symmetrical burst control integrated circuit in an 8 pin DIL package. When used with a triac, AC power may be regulated by varying the number of mains cycles applied to the load in a fixed timing period. The device is especially suited to room temperature control applications including panel heaters, fan heaters etc. Zero Voltage Switching has the advantage of minimising radio frequency interference.
FEATURES s Balanced zero voltage point crossing detector, spike filter and pulse generator for reliable triggering of the triac. s A period pulse generator and bistable which are arranged to provide symmetrical burst control and eliminate 1 / 2 wave firing. (EN50.006 BS5406,1976) s A ramp generator whose output is used to modify an internal reference voltage which is then compared with the voltage appearing on the thermistor to form a proportional control system. The period of the ramp generator is defined externally and may be chosen to limit 'lamp flicker' in accordance with EN50.006/BS5406, 1976.
DP8 Fig.1 Pin Connections (top view)
s The comparison amplifier has inbuilt hysteresis to eliminate switching jitter and a spike filter/ sampling circuit to provide high immunity to both spikes and coherent 50Hz/60Hz. s Thermistor malfunction may be sensed and power automatically removed. s A supply voltage sensing circuit which inhibits firing pulses when the supply is inadequate to guarantee proper circuit operation. This eliminates stressing of the triac at switch-on.
Fig. 2 Block Schematic of SL441C
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SL441C
ELECTRICAL CHARACTERISTICS
These Characteristics are guaranteed at the following temperatures (unless otherwise stated). Tamb = +25C All voltages measured with respect to common (pin 1) Characteristics Shunt regulating voltage pin 3 @ 16mA Shunt regulating voltage pin 3 @ 16mA @ 75C Supply voltage trip level pin 3 Supply current (less I4AV, I5) (see Note 1) Regulated voltage pin 5 Regulated voltage temperature coefficient pin 5 Triac gate drive pin 4 (see Note 2) Open circuit ON voltage Open circuit OFF voltage Output current into 2V drain Output current into 4V drain Output current into short circuit Internal drain resistance Control input pin 8 Bias current Hysteresis Sensor malfunction circuit operates at Input working voltage range Internal reference voltage (Ramp start) (see Note 3) Internal reference voltage (Ramp finish) (see Note 3) Peak-to-peak amplitude of ramp Pin 6 output impedance (R6) (see Note 2) Maximum ripple voltage pin 3 70 21.5 150 0 4.0 4.25 4.35 100 27 130 32.5 1 20 200 250 12 4.5 1 A mV mV V V V mV k VP-P 800 100 65 130 80 200 8.5 0.1 V V mA mA mA 8.0 -1 8.5 12.2 7.5 9.0 +1 Min Typ 14.7 16 Max Units V V V mA V mV/ C
NOTES 1. The supply current is 0.45 x (RMS current fed into pin 2). I5 is the current drained from pin 5 externally. I4AV is the average triac gate current supplied each mains cycle. 2. Triac firing pulse. tp Pulse width = 0.69 R6CD microseconds typical tf Pulse finish = 1.09 R6CD microseconds minimum after zero voltage point R6 in kohms. CD in nF. See Application circuit tp Nominal (CD = 2.7nF) = 50 microseconds tp Minimum (CD = 2.7nF) = 63 microseconds 3. Ramp period = 0.85 0.15 x RTCT sec. See Application circuit. The actual value of Rt must lie between 500kohms and 3Mohms.
ABSOLUTE MAXIMUM RATINGS
VOLTAGES Voltage on pin V8 - I Max. 12V Voltage on pin V4 - I Max. 10V TEMPERATURE Operating ambient temperature TAMB -10C to +75C Storage temperature TSTG -55C to +150C CURRENTS Supply current (pin 2) Peak value I2M 50mA. Non-repetitive peak current (tp <250s) I2SM 200mA. Output current (pin 5) Max. 5mA Short circuit protected. Output current (pin 4) average value I4 (AV) Max 5mA Short circuit protected
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SL441C
AVERAGE POWER IN LOAD (%)
R thj - a = 200C/W
CONTROL VOLTAGE (PIN 8)
0.2V SENSOR MALFUNCTION CIRCUIT TRIP POINT 0V OPERATIONAL LIMIT
RAMP FINISH 100mV TYP. 4.25V RAMP START 8.5V (V5)
14.7V (V3) 12V ABSOLUTE MAX. RATING
Fig. 3 Power Dissipation
Fig. 4 Control Characteristic of Pin 8
8.5V
TP = 0.69RC TF = 1.09RC R = PIN 6 OUTPUT IMPEDANCE (R6)
TP = 0.69RC TF = 1.09RC C = CD CAPACITOR CONNECTED TO PIN 6
Fig. 5 Pulse Timing
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SL441C
HEADQUARTERS OPERATIONS GEC PLESSEY SEMICONDUCTORS Cheney Manor, Swindon, Wiltshire SN2 2QW, United Kingdom. Tel: (0793) 518000 Tx: 449637 Fax: (0793) 518411 GEC PLESSEY SEMICONDUCTORS P.O. Box 66017, 1500 Green Hills Road, Scotts Valley, California 95067-0017, United States of America. Tel (408) 438 2900 ITT Telex: 4940840 Fax: (408) 438 5576
CUSTOMER SERVICE CENTRES * FRANCE & BENELUX Les Ulis Cedex Tel: (1) 64 46 23 45 Tx: 602858F Fax : (1) 64 46 06 07 * GERMANY Munich Tel: (089) 3609 06-0 Tx: 523980 Fax : (089) 3609 06-55 * ITALY Milan Tel: (02) 66040867 Fax: (02)66040993 * JAPAN Tokyo Tel: (03) 3296-0281 Fax: (03) 3296-0228 * NORTH AMERICA Integrated Circuits and Microwave Products, Scotts Valley, USA Tel (408) 438 2900 ITT Tx: 4940840 Fax: (408) 438 7023. Hybrid Products, Farmingdale, USA Tel (516) 293 8686 Fax: (516) 293 0061. * SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872 * SWEDEN Stockolm Tel: 46 8 702 97 70 Fax: 46 8 640 47 36 * UNITED KINGDOM & SCANDINAVIA Swindon Tel: (0793) 518510 Tx: 444410 Fax : (0793) 518582 These are supported by Agents and Distributors in major countries world-wide. (c) GEC Plessey Semiconductors 1993 Publication No.DS3848 Issue No. 1.0 June 1993
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