Datasheet tca 785

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TCA 785

Phase Control IC

TCA 785
Bipolar IC

Features
q q q q q q q q

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-16-1

Type TCA 785

Ordering Code Q67000-A2321

Package P-DIP-16-1

This phasecontrol 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 Definitions and Functions Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 Pin Configuration (top view)Semiconductor Group 14 15 16 1 Symbol GND Q2 QU Q2 VSYNC I QZ V REF R9 C10 V11 C12 L Q1 Q2 VS Function Ground Output 2 inverted Output U Output 1 inverted Synchronous voltage Inhibit Output Z Stabilized voltage Ramp resistance Ramp capacitance Control voltage Pulse extension Long pulse Output 1 Output 2 Supply voltage 09.94

TCA 785

Functional Description The synchronization signal isobtained 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 isprocessed 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˚ willresult. 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 pulselength (180˚ – ϕ).

Block Diagram Semiconductor Group 2

TCA 785

Pulse Diagram

Semiconductor Group

3

TCA 785

Absolute Maximum Ratings Parameter Supply voltage Output current at pin 14, 15 Inhibit voltage Control voltage Voltage short-pulse circuit Synchronization input current Output voltage at pin 14, 15 Output current at pin 2, 3, 4, 7 Output voltage at pin 2, 3, 4, 7Junction temperature Storage temperature Thermal resistance system - air Operating Range Supply voltage Operating frequency Ambient temperature VS f TA 8 10 – 25 18 500 85 V Hz ˚C Symbol min. VS IQ V6 V11 V13 V5 VQ IQ VQ Tj Tstg Rth SA – 55 – 0.5 – 10 – 0.5 – 0.5 – 0.5 – 200 Limit Values max. 18 400 VS VS VS
± 200

Unit V mA V V V
µA

VS 10 VS 150 125 80

V mA V ˚C ˚C K/W

Characteristics 8 ≤VS ≤ 18 V; – 25 ˚C ≤ TA ≤ 85 ˚C; f = 50 Hz Parameter Supply current consumption S1 … S6 open V11 = 0 V C 10 = 47 nF; R 9 = 100 kΩ Synchronization pin 5 Input current R 2 varied Offset voltage Control input pin 11 Control voltage range Input resistance Semiconductor Group Symbol min. IS 4.5 Limit Values typ. 6.5 max. 10 Unit Test Circuit mA 1

I5 rms
∆V5

30 30 0.2 15 4

200 75 V10 peak

µA1

mV 4 V kΩ 1 5

V11 R11

TCA 785

Characteristics (cont’d) 8 ≤ VS ≤ 18 V; – 25 ˚C ≤ TA ≤ 85 ˚C; f = 50 Hz Parameter Ramp generator Charge current Max. ramp voltage Saturation voltage at capacitor Ramp resistance Sawtooth return time Inhibit pin 6 switch-over of pin 7 Outputs disabled Outputs enabled Signal transition time Input current V6 = 8 V Input current V6 = 1.7 V Deviation...
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