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U217B/ U217B-FP TELEFUNKEN Semiconductors Rev. A1, 24-May-96 2 (11) General Description The integrated circuit, U217B, is a triac controller for the zero crossing mode. It is meant to control power in switching resistive loads of mains supply. Information regarding supply sync. is provided at Pin 8 via resistor RSync. Offer U211B2 TFK from Kynix Semiconductor Hong Kong Limited.IC Chips The integrated circuit U211B2/ B3 is designed as a phase- control circuit in bipolar technology with an internal frequency-voltage converter. Furthermore, it has an inter- nal control amplifier which means it can be used for speed-regulated motor applications.