II TCA280A
TRIGGER MODULE
The TCA280A is a monolithic integrated circuit designed for thyristor and triac control.
It contains the following circuit sections:
- d.c. power supply
(intended for direct a. c. supply)
- zero-crossing detector (for synchronization of the trigger circuit)
- difference amplifier
(used as a sensing amplifier)
- ramp function generator (operating as the sawtooth oscillator in time,..proportional
control)
- output amplifier
(amplifying the trigger pulses and feeding the thyristor or triac
gate)
Various control modes possible when using the TCA280Aare:
- phase control
- synchronous on/off switching (static switch)
- time proportional control
The device is designed to be supplied directly from the a. c. mains through a dropping
resistor, alternatively, supply can be obtained from a 14,5 V (d. c.) source connected
between pins 11 and 16.
The output current capability permits triggering of large thyristors and triacs.
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PACKAGE OUTLINE plastic 16-1ead dual in-line (see general section.
August 1976
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