Phase Control IC TCA 785

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Winifred Griffin
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Phase Control IC Bipolar IC 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

The trigger pulses can be shifted within a phase angle between 0 and 80. Typical applications include converter circuits, AC controllers and three-phase current controllers.

1 Phase Control IC Bipolar IC 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 P-DIP-6- Type Ordering Code Package Q67000-A232 P-DIP-6- 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 80. 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) Pin Definitions and Functions Pin Symbol Function GND Ground Q2 Q U Q2 Output 2 inverted Output U Output inverted 5 SYNC Synchronous voltage 6 7 I Q Z Inhibit Output Z 8 REF Stabilized voltage 9 0 R9 C0 Ramp resistance Ramp capacitance Control voltage 2 C2 Pulse extension 3 L Long pulse 4 5 Q Q 2 Output Output 2 6 S Supply voltage Semiconductor Group 09.94

2 Functional Description The synchronization signal is obtained via a high-ohmic resistance from the line voltage (voltage 5). A zero voltage detector evaluates the zero passages and transfers them to the synchronization register. This synchronization register controls a ramp generator, the capacitor C0 of which is charged by a constant current (determined by R9). If the ramp voltage 0 exceeds the control voltage (triggering angle ϕ), a signal is processed to the logic. Dependent on the magnitude of the control voltage, the triggering angle ϕ can be shifted within a phase angle of 0 to 80. For every half wave, a positive pulse of approx. 30 µs duration appears at the outputs Q and Q 2. The pulse duration can be prolonged up to 80 via a capacitor C2. If pin 2 is connected to ground, pulses with a duration between ϕ and 80 will result. Outputs Q and Q 2 supply the inverse signals of Q and Q 2. A signal of ϕ +80 which can be used for controlling an external logic,is available at pin 3. A signal which corresponds to the NOR link of Q and Q 2 is available at output Q Z (pin 7). The inhibit input can be used to disable outputs Q, Q2 and Q, Q 2. Pin 3 can be used to extend the outputs Q and Q 2 to full pulse length (80 ϕ). Block Diagram Semiconductor Group 2

3 Pulse Diagram Semiconductor Group 3

4 Absolute Maximum Ratings Parameter Symbol Limit alues min. max. Supply voltage S Output current at pin 4, 5 IQ Inhibit voltage Control voltage oltage short-pulse circuit Thermal resistance system - air Rth SA Synchronization input current ± 200 Output voltage at pin 4, 5 Q S Output current at pin 2, 3, 4, 7 IQ 0 Output voltage at pin 2, 3, 4, 7 Q S Junction temperature Storage temperature Tj Tstg 55 S S S Unit ma µa ma C C K/W Operating Range Supply voltage S 8 8 Operating frequency f Ambient temperature TA Hz C Characteristics 8 S 8 ; 25 C TA 85 C; f = 50 Hz Parameter Supply current consumption S S6 open = 0 C 0 = 47 nf; R 9 = 00 kω Synchronization pin 5 Input current R 2 varied Offset voltage Control input pin Control voltage range Input resistance Symbol min. Limit alues typ. max. Unit IS ma I5 rms 5 R µa m peak 5 kω 5 Test Circuit 4 Semiconductor Group 4

5 Characteristics (cont d) 8 S 8 ; 25 C TA 85 C; f = 50 Hz Parameter Symbol min. Limit alues typ. max. Unit Test Circuit Ramp generator Charge current Max. ramp voltage Saturation voltage at capacitor Ramp resistance Sawtooth return time I0 0 0 R9 tf µa m kω µs.6 Inhibit pin 6 switch-over of pin 7 Outputs disabled Outputs enabled Signal transition time Input current 6 = 8 Input current 6 =.7 6 L 6 H tr I6 H I6 L µs µa µa Deviation of I0 R 9 = const. S = 2 ; C0 = 47 nf Deviation of I0 R 9 = const. S = 8 to 8 Deviation of the ramp voltage between 2 following half-waves, S = const. I0 I0 0 max 5 20 ± 5 20 % % % Long pulse switch-over pin 3 switch-over of S8 Short pulse at output Long pulse at output Input current 3 = 8 Input current 3 =.7 3 H 3 L I3 H I3 L µa µa Outputs pin 2, 3, 4, 7 Reverse current ICEO 0 µa 2.6 Q = S Saturation voltage IQ = 2 ma sat Semiconductor Group 5

6 Characteristics (cont d) 8 S 8 ; 25 C TA 85 C; f = 50 Hz Parameter Outputs pin 4, 5 H-output voltage I Q = 250 ma L-output voltage IQ = 2 ma Pulse width (short pulse) S9 open Pulse width (short pulse) with C2 Internal voltage control Reference voltage Parallel connection of 0 ICs possible TC of reference voltage Symbol 4/5 H 4/5 L tp tp REF αref min. S Limit alues typ. max. S S Unit µs µs/ nf /K Test Circuit Semiconductor Group 6

7 Application Hints for External Components Ramp capacitance Triggering point Charge current min max C0 500 pf µf ) ttr = I0 = R9 C0 2) REF K REF K 2) R9 The minimum and maximum values of I0 are to be observed Ramp voltage 0 max = S 2 0 = REF K t R9 C0 2) Pulse Extension versus Temperature ) Attention to flyback times 2) K =.0 ± 20 % Semiconductor Group 7

8 Output oltage measured to + S Supply Current versus Supply oltage Semiconductor Group 8

9 It is necessary for all measurements to adjust the ramp with the aid of C0 and R 9 in the way that 3 ramp max S 2 e.g. C0 = 47 nf; 8 : R 9 = 47 kω; 8 : R 9 = 20 kω Test Circuit Semiconductor Group 9

10 The remaining pins are connected as in test circuit Test Circuit 2 The remaining pins are connected as in test circuit Test Circuit 3 Semiconductor Group 0

11 Remaining pins are connected as in test circuit The 0 µf capacitor at pin 5 serves only for test purposes Test Circuit 4 Test Circuit 5 Test Circuit 6 Semiconductor Group

12 Inhibit 6 Long Pulse 3 Pulse Extension 2 Reference oltage 8 Semiconductor Group 2

13 Application Examples Triac Control for up to 50 ma Gate Trigger Current A phase control with a directly controlled triac is shown in the figure. The triggering angle of the triac can be adjusted continuously between 0 and 80 with the aid of an external potentiometer. During the positive half-wave of the line voltage, the triac receives a positive gate pulse from the IC output pin 5. During the negative half-wave, it also receives a positive trigger pulse from pin 4. The trigger pulse width is approx. 00 µs. Semiconductor Group 3

14 Fully Controlled AC Power Controller Circuit for Two High-Power Thyristors Shown is the possibility to trigger two antiparalleled thyristors with one IC. The trigger pulse can be shifted continuously within a phase angle between 0 and 80 by means of a potentiometer. During the negative line half-wave the trigger pulse of pin 4 is fed to the relevant thyristor via a trigger pulse transformer. During the positive line half-wave, the gate of the second thyristor is triggered by a trigger pulse transformer at pin 5. Semiconductor Group 4

15 Half-Controlled Single-Phase Bridge Circuit with Trigger Pulse Transformer and Direct Control for Low-Power Thyristors Semiconductor Group 5

16 Half-Controlled Single-Phase Bridge Circuit with Two Trigger Pulse Transformers for Low-Power Thyristors Semiconductor Group 6

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