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4 / 19 page May 1991 4 Philips Semiconductors Product specification Proportional-control triac triggering circuit TDA1023/T FUNCTIONAL DESCRIPTION The TDA1023 generates pulses to trigger a triac. These pulses coincide with the zero excursions of the mains voltage, thus minimizing RF interference and mains supply transients. In order to gate the load on and off, the trigger pulses occur in bursts thus further reducing mains supply pollution. The average power in the load is varied by modifying the duration of the trigger pulse burst in accordance with the voltage difference between the control input CI and the reference input, either UR or BR. Power supply: VCC, RX and Vz (pins 14, 16 and 11) The TDA1023 is supplied from the AC mains via a resistor RD to the RX connection (pin 16); the VEE connection (pin 13) is linked to the neutral line (see Fig.4a). A smoothing capacitor CS should be coupled between the VCC and VEE connections. A rectifier diode is included between the RX and VCC connections whilst the DC supply voltage is limited by a chain of stabilizer diodes between the RX and VEE connections (see Fig.3). A stabilized reference voltage (VZ) is available at pin 11 to power an external temperature sensing bridge. Supply operation During the positive mains half-cycles the current through the external voltage dropping resistor RD charges the external smoothing capacitor CS until RX attains the stabilizing potential of the internal stabilizing diodes. RD should be selected to be capable of supplying the current ICC for the TDA1023, the average output current I3(AV), recharge the smoothing capacitor CS and provide the supply for an external temperature bridge. (see Figs 9 to 12). Any excess current is by-passed by the internal stabilizer diodes. The maximum rated supply current, however, must not be exceeded. During the negative mains half-cycles external smoothing capacitor CS supplies the sum of the current demand described above. Its capacitance must be sufficiently high to maintain the supply voltage above the specified minimum. Dissipation in resistor RD is halved by connecting a diode in series (see Fig.4b and 9 to 12). A further reduction in dissipation is possible by using a high quality dropping capacitor CD in series with a resistor RSD (see Figs 4c and 14). Protection of the TDA1023 and the triac against mains-borne transients can be provided by connecting a suitable VDR across the mains input. Control and reference inputs CI, BR and UR (pins 6, 9 and 7) For the control of room temperature (5 °C to 30 °C) optimum performance is obtained by using the translation circuit. The buffered reference input BR (pin 9) is used as a reference input whilst the output reference buffer QR (pin 8) is connected to the unbuffered reference input UR (pin 7). This ensures that the range of room temperature is encompassed in most of the rotation of the potentiometer to give a linear temperature scale with accurate setting. Should the translation circuit not be required, the unbuffered reference input UR (pin 7) is used as a reference input. The buffered reference input BR (pin 9) must then be connected to the reference supply output VZ (pin 11). For proportional power control the unbuffered reference input UR (pin 7) must be connected to the firing burst repetition time control input TB (pin 12).The buffered reference input BR (pin 9), which is in this instance inactive, must then be connected to the reference supply output VZ (pin 11). Proportional range control input PR (pin 5) The output duty factor changes from 0% to 100% by a variation of 80 mV at the control input CI (pin 6) with the proportional range control input PR open. For temperature control this corresponds to a temperature difference of 1 K. By connecting the proportional range control input PR (pin 5) to ground the range may be increased to 400 mV, i.e. 5 K. Intermediate values may be obtained by connecting the PR input to ground via a resistor R5 (see Table 1). Hysteresis control input HYS (pin 4) With the hysteresis control input HYS (pin 4) open, the device has a built-in hysteresis of 20 mV. For temperature control this corresponds with 0.25 K. Hysteresis is increased to 320 mV, corresponding to 4 K, by grounding HYS (pin 4). Intermediate values are obtained by connecting pin 4 via resistor R4 to ground. Table 1 provides a set of values for R4 and R5 giving a fixed ratio between hysteresis and proportional range. |
Số phần tương tự - TDA1023 |
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Mô tả tương tự - TDA1023 |
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