Signetics TDA1024
The TDA1024 generates positive-going output pulses to trigger a triac. These trigger pulses coincide with the zero crossings of the mains voltage. Supply: V q c and R X (pins 8 and 7) The TDA1024 may be supplied by an external d.c.| Part No. | TDA1024 |
|---|---|
| Datasheet | TDA1024 Download |
| Manufacturer |  Signetics |
| Description | ZERO CROSSING TRIAC TRIGGER |
| Buy | Stock & Price |
DESCRIPTION
This minimizes r.f. interference and transients on the mains supply. power supply connected to V qq (pin 8), but usually it is supplied directly from the mains voltage. For this purpose the circuit contains a stabilizer diode between R X and V e e that limits the d.c. supply voltage (see Fig. 4). An external resistor R q has to be connected frorg the mains to R X (pin 7); V e e is connected to the neutral line (see Fig. 5a). A smooth ing capacitor C§ has to be connected between V q c and V e e - During the positive half of the mains cycles the current through external voltage-dropping resistor R q charges the external smoothing capacitor C§ up to the stabilizing voltage of the internal stabilizer diodes. R q should be chosen such that it can supply the current Ic e for-the TDA1024 itself plus the average output current - I q (a V ) ' and recharge the smoothing capacitor C$. Any excess current is bypassed by the internal stabilizer diode. Note that the maximum rated supply current must not be exceeded.
