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TAC785 Datasheet

Phase Control IC

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TCA 785
Phase Control IC
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
P-DIP-16-1
Type
TCA 785
Ordering Code
Q67000-A2321
Package
P-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.
http://www.DataSheet4U.net/
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
09.94
datasheet pdf - http://www.DataSheet4U.net/



Siemens Electronic Components Datasheet

TAC785 Datasheet

Phase Control IC

No Preview Available !

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 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 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).
http://www.DataSheet4U.net/
Block Diagram
Semiconductor Group
2
datasheet pdf - http://www.DataSheet4U.net/


Part Number TAC785
Description Phase Control IC
Maker Siemens
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TAC785 Datasheet PDF





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