Proportional-control triac triggering circuit

FEATURES
• Adjustable width of proportional range
• Adjustable hysteresis
• Adjustable width of trigger pulse
• Adjustable repetition timing of firing burst
• Control range translation facility
• Fail safe operation
• Supplied from the mains
• Provides supply for external temperature bridge

APPLICATIONS
• Panel heaters
• Temperature control

GENERAL DESCRIPTION
The TDA1023 is a bipolar integrated circuit for controlling
triacs in a proportional time or burst firing mode. Permitting
precise temperature control of heating equipment it is
especially suited to the control of panel heaters.
It generates positive-going trigger pulses but complies with
regulations regarding mains waveform distortion and RF
interference.