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tca785

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tca785

  1. 1. TCA 785Phase Control IC TCA 785 Bipolar ICFeaturesq Reliable recognition of zero passageq Large application scopeq May be used as zero point switchq LSL compatibleq Three-phase operation possible (3 ICs)q Output current 250 mAq Large ramp current rangeq Wide temperature range P-DIP-16-1Type Ordering Code PackageTCA 785 Q67000-A2321 P-DIP-16-1This phase control IC is intended to control thyristors, triacs, and transistors. The trigger pulsescan be shifted within a phase angle between 0 ˚ and 180 ˚. Typical applications includeconverter circuits, AC controllers and three-phase current controllers.This IC replaces the previous types TCA 780 and TCA 780 D. Pin Definitions and Functions Pin Symbol Function 1 GND Ground 2 Q2 Output 2 inverted 3 QU Output U 4 Q2 Output 1 inverted 5 VSYNC Synchronous voltage 6 I Inhibit 7 QZ 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 Q1 Output 1Pin Configuration 15 Q2 Output 2(top view) 16 VS Supply voltageSemiconductor Group 1 09.94
  2. 2. TCA 785Functional DescriptionThe 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 thesynchronization register.This synchronization register controls a ramp generator, the capacitor C10 of which is chargedby a constant current (determined by R9). If the ramp voltage V10 exceeds the control voltageV11 (triggering angle ϕ), a signal is processed to the logic. Dependent on the magnitude of thecontrol 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 andQ 2. The pulse duration can be prolonged up to 180˚ via a capacitor C12. If pin 12 is connectedto ground, pulses with a duration between ϕ and 180˚ will result.Outputs Q 1 and Q 2 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 Q 1 , Q 2 .Pin 13 can be used to extend the outputs Q 1 and Q 2 to full pulse length (180˚ – ϕ).Block DiagramSemiconductor Group 2
  3. 3. TCA 785Pulse DiagramSemiconductor Group 3
  4. 4. TCA 785Absolute Maximum RatingsParameter Symbol Limit Values Unit min. max.Supply voltage VS – 0.5 18 VOutput current at pin 14, 15 IQ – 10 400 mAInhibit voltage V6 – 0.5 VS VControl voltage V11 – 0.5 VS VVoltage short-pulse circuit V13 – 0.5 VS VSynchronization input current V5 – 200 ± 200 µAOutput voltage at pin 14, 15 VQ VS VOutput current at pin 2, 3, 4, 7 IQ 10 mAOutput voltage at pin 2, 3, 4, 7 VQ VS VJunction temperature Tj 150 ˚CStorage temperature Tstg – 55 125 ˚CThermal resistancesystem - air Rth SA 80 K/WOperating RangeSupply voltage VS 8 18 VOperating frequency f 10 500 HzAmbient temperature TA – 25 85 ˚CCharacteristics8 ≤ VS ≤ 18 V; – 25 ˚C ≤ TA ≤ 85 ˚C; f = 50 HzParameter Symbol Limit Values Unit Test Circuit min. typ. max.Supply current consumption IS 4.5 6.5 10 mA 1S1 … S6 openV11 = 0 VC 10 = 47 nF; R 9 = 100 kΩSynchronization pin 5Input current I5 rms 30 200 µA 1R 2 variedOffset voltage ∆V5 30 75 mV 4Control input pin 11Control voltage range V11 0.2 V10 peak V 1Input resistance R11 15 kΩ 5Semiconductor Group 4
  5. 5. TCA 785Characteristics (cont’d)8 ≤ VS ≤ 18 V; – 25 ˚C ≤ TA ≤ 85 ˚C; f = 50 HzParameter Symbol Limit Values Unit Test Circuit min. typ. max.Ramp generatorCharge current I10 10 1000 µAMax. ramp voltage V10 V2 – 2 V 1Saturation voltage at capacitor V10 100 225 350 mV 1.6Ramp resistance R9 3 300 kΩ 1Sawtooth return time tf 80 µs 1Inhibit pin 6switch-over of pin 7Outputs disabled V6 L 3.3 2.5 V 1Outputs enabled V6 H 4 3.3 V 1Signal transition time tr 1 5 µs 1Input current I6 H 500 800 µA 1V6 = 8 VInput current – I6 L 80 150 200 µA 1V6 = 1.7 VDeviation of I10 I10 –5 5 % 1R 9 = const.VS = 12 V; C10 = 47 nFDeviation of I10 I10 – 20 20 % 1R 9 = const.VS = 8 V to 18 VDeviation of the ramp voltagebetween 2 followinghalf-waves, VS = const. ∆V10 max ±1 %Long pulse switch-overpin 13switch-over of S8Short pulse at output V13 H 3.5 2.5 V 1Long pulse at output V13 L 2.5 2 V 1Input current I13 H 10 µA 1V13 = 8 VInput current – I13 L 45 65 100 µA 1V13 = 1.7 VOutputs pin 2, 3, 4, 7Reverse current ICEO 10 µA 2.6VQ = VSSaturation voltage Vsat 0.1 0.4 2 V 2.6IQ = 2 mASemiconductor Group 5
  6. 6. TCA 785Characteristics (cont’d)8 ≤ VS ≤ 18 V; – 25 ˚C ≤ TA ≤ 85 ˚C; f = 50 HzParameter Symbol Limit Values Unit Test Circuit min. typ. max.Outputs pin 14, 15H-output voltage V14/15 H VS – 3 VS – 2.5 VS – 1.0 V 3.6– I Q = 250 mAL-output voltage V14/15 L 0.3 0.8 2 V 2.6IQ = 2 mAPulse width (short pulse) tp 20 30 40 µs 1S9 openPulse width (short pulse) tp 530 620 760 µs/ 1with C12 nFInternal voltage controlReference voltage VREF 2.8 3.1 3.4 V 1Parallel connection of10 ICs possibleTC of reference voltage αREF 2 × 10 – 4 5 × 10 – 4 1/K 1Semiconductor Group 6
  7. 7. TCA 785Application Hints for External Components min maxRamp capacitance C10 500 pF 1 µF1) The minimum and maximum values of I10 are to be observed V11 × R9 × C10 2)Triggering point tTr = VREF × K Ramp voltage VREF × K 2) VREF × K × t 2)Charge current I10 = V10 max = VS – 2 V V10 = R9 R9 × C10 Pulse Extension versus Temperature1) Attention to flyback times2) K = 1.10 ± 20 %Semiconductor Group 7
  8. 8. TCA 785Output Voltage measured to + VSSupply Current versus Supply VoltageSemiconductor Group 8
  9. 9. TCA 785 It is necessary for all measurements to adjust the ramp with the aid of C10 and R 9 in the way that 3 V ≤ Vramp max ≤ V S – 2 V e.g. C10 = 47 nF; 18 V: R 9 = 47 kΩ; 8 V: R 9 = 120 kΩTest Circuit 1Semiconductor Group 9
  10. 10. TCA 785 The remaining pins are connected as in test circuit 1Test Circuit 2 The remaining pins are connected as in test circuit 1Test Circuit 3Semiconductor Group 10
  11. 11. TCA 785 Remaining pins are connected as in test circuit 1 The 10 µF capacitor at pin 5 serves only for test purposesTest Circuit 4Test Circuit 5 Test Circuit 6Semiconductor Group 11
  12. 12. TCA 785Inhibit 6 Long Pulse 13Pulse Extension 12 Reference Voltage 8Semiconductor Group 12
  13. 13. TCA 785Application ExamplesTriac Control for up to 50 mA Gate Trigger CurrentA phase control with a directly controlled triac is shown in the figure. The triggering angle ofthe triac can be adjusted continuously between 0˚ and 180˚ with the aid of an externalpotentiometer. During the positive half-wave of the line voltage, the triac receives a positivegate pulse from the IC output pin 15. During the negative half-wave, it also receives a positivetrigger pulse from pin 14. The trigger pulse width is approx. 100 µs.Semiconductor Group 13
  14. 14. TCA 785Fully Controlled AC Power ControllerCircuit for Two High-Power ThyristorsShown is the possibility to trigger two antiparalleled thyristors with one IC TCA 785. The triggerpulse can be shifted continuously within a phase angle between 0˚ and 180˚ by means of apotentiometer. During the negative line half-wave the trigger pulse of pin 14 is fed to therelevant thyristor via a trigger pulse transformer. During the positive line half-wave, the gate ofthe second thyristor is triggered by a trigger pulse transformer at pin 15.Semiconductor Group 14
  15. 15. TCA 785Half-Controlled Single-Phase Bridge Circuit with Trigger Pulse Transformer and DirectControl for Low-Power ThyristorsSemiconductor Group 15
  16. 16. TCA 785Half-Controlled Single-Phase Bridge Circuit with Two Trigger Pulse Transformers forLow-Power ThyristorsSemiconductor Group 16
  17. 17. This datasheet has been download from: www.datasheetcatalog.comDatasheets for electronics components.

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