Phase Control IC TCA 785
Features 
● Reliable recognition of zero passage
● Large application scope
● May be used as zero point switch
● LSL compatible
● Three-phase operation possible (3 ICs)
● Output current 250 mA
● Large ramp current range
● Wide temperature range
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.
Absolute Maximum Ratings
| Parameter | Symbol | Limit Values | Unit |
| min. | max. |
| Supply voltage | VS | – 0.5 | 18 | V |
| Output current at pin 14, 15 | IQ | -10 | 400 | mA |
| Inhibit voltage Control voltage Voltage short-pulse circuit | V6 V11 V13 | – 0.5 – 0.5 – 0.5 | VS VS VS | V V V |
| Synchronization input current | V5 | -200 | ± 200 | µA |
| Output voltage at pin 14, 15 | VQ | | VS | V |
| Output current at pin 2, 3, 4, 7 | IQ | | 10 | mA |
| Output voltage at pin 2, 3, 4, 7 | VQ | | VS | V |
| Junction temperature Storage temperature | Tj Tstg | – 55 | 150 125 | ˚C ˚C |
| Thermal resistance system - air | Rth SA | | 80 | K/W |
| Operating Range |
| Supply voltage | VS | 8 | 18 | V |
| Operating frequency | f | 10 | 500 | Hz |
| Ambient temperature | TA | – 25 | 85 | ˚C |
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 charged by a constant current (determined by R9). If the ramp voltage V10 exceeds the control voltage V11 (triggering angle ϕ), a signal is processed to the logic. Dependent on the magnitude of the control voltage V11, the triggering angle ϕ can be shifted within a phase angle of 0˚ to 180˚.
For every half wave, a positive pulse of approx. 30 µs duration appears at the outputs Q 1 and Q 2. The pulse duration can be prolonged up to 180˚ via a capacitor C12. If pin 12 is connected to ground, pulses with a duration between ϕ and 180˚ will result.
Outputs and supply the inverse signals of Q 1 and Q 2.
A signal of ϕ +180˚ which can be used for controlling an external logic,is available at pin 3.
A signal which corresponds to the NOR link of Q 1 and Q 2 is available at output Q Z (pin 7).
The inhibit input can be used to disable outputs Q1, Q2 and , .
Pin 13 can be used to extend the outputs and to full pulse length (180˚ – ϕ).
Block Diagram
Pulse Diagram
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