TCA785

TCA 785 Phase Control IC Pb-free lead plating; RoHS compliant Features q Reliable recognition of zero passage q Large application scope q May be used as zero point switch q LSL compatible q Three-phase operation possible (3 ICs) q Output current 250 mA q Large ramp current range q Wide temperature range TCA 785 Bipolar IC PG-DIP-16-1 Type TCA 785 Ordering Code Q67000-A2321 Package PG-DIP-16-1 This phase control IC is intended to control thyristors, triacs, and transistors. The trigger pulses can be shifted within a phase angle between 0 ˚ and 180 ˚. Typical applications include converter circuits, AC controllers and three-phase current controllers. This IC replaces the previous types TCA 780 and TCA 780 D. Pin Configuration (top view) Semiconductor Group Pin Definitions and Functions Pin Symbol Function 1 GND Ground 2 Q2 Output 2 inverted 3 Q U Output U 4 Q2 Output 1 inverted 5 VSYNC Synchronous voltage 6I Inhibit 7 Q Z Output Z 8 V REF Stabilized voltage 9 R9 Ramp resistance 10 C10 Ramp capacitance 11 V11 Control voltage 12 C12 Pulse extension 13 L Long pulse 14 Q 1 Output 1 15 Q 2 Output 2 16 VS Supply voltage 1 02.05 TCA 785 Functional Description The synchronization signal is obtained via a high-ohmic resistance from the line voltage (voltage V5). A zero voltage detector evaluates the zero passages and transfers them to the synchronization register. This synchronization register controls a ramp generator, the capacitor C10 of which is charge...