United Automation, ZAX27A, Thyristor Power Controller

Fully isolated device features an integral power circuit capable of controlling currents up to 1·5A.

Suitable for slave firing triacs or thyristor pairs
Phase-angle or Burst firing operating modes (hot selectable by 1 pin logic change)
Output inhibit, overheat shut down, soft-start and current limit
Accurate regulation of power to all loads
Capable of microcontroller control
Uncommitted op-amp can be used as an error amplifier or comparator for feedback

The number of complete mains cycles during fixed repeating periods (typically 1 to 10 seconds) is varied, thus altering the duty cycle or on-/off-time ratio. Trigger pulses coincide with the zero-crossing times of the mains supply thus ensuring no RFI is produced when using resistive loads.