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Symbol Parameter Value Unit
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TCA785
Function and Industrial ICs
SIEMENS
Phase Control IC TCA 785
Bipolar IC
Features
0 Reliable recognition of zero passage
0 Large application scope
0 May be used as zero point switch
0 LSL compatible
0 Three-phase operation possible (3 ICs)
0 Output current 250 mA
0 Large ramp current range
0 Wide temperature range
P-DIP-16-1
Type Ordering Code Package
TCA 785 Q67000-A2321 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 l 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
|_l Pin Symbol Function
GND . 161% 1 GND Ground
(r L fl 15102 2 cT2 Output 2 inverted
3 Q U Output U
BUD 14101 4 cT2 Output1 inverted
I L 4 13 T 5 Vsmc Synchronous voltage
M . l J [12 , IQZ 33:33 Z
I Ls Cl V11 8 VREF Stabilized voltage
W W I, fi, §§$E£Zi§§t2$ece
VREF L 8 9 T, 11 V11 Control voltage
1900356 12 C12 Pulse extension
13 L Long pulse
14 Q 1 Output 1
Pin Configuration 15 Q 2 Output 2
(top view) 16 Vs Supply voltage
Semiconductor Group 1 09.94
SIEMENS TCA 785
Functional Description
The synchronization signal is obtained via a high-ohmic resistance from the line voltage
(voltage Vs). A zero voltage detector evaluates the zero passages and transfers them to the
synchronization register.
This synchronization register controls a ramp generator, the capacitor Cho of which is charged
by a constant current (determined by R9). If the ramp voltage V10 exceeds the control voltage
V11 (triggering angle (p), a signal is processed to the logic. Dependent on the magnitude of the
control voltage V11, the triggering angle (p can be shifted within a phase angle of O'' to 1801
For every half wave, a positive pulse of approx. 30 its 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 (p and 180° will result.
Outputs WT and 07 supply the inverse signals of Q 1 and Q 2.
A signal of (p +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 tTI , 07 .
Pin 13 can be used to extend the outputs TTT and W2 to full pulse length (180° - (p).
, LPutse
2 ExteriSion
SYNC I> Zero Sync'hron‘ a 14 Ol
Detettor Register -ar-h ll -
l/ 16 V L _ 15 02
S 8 Discharge oglc 2 -
- dr, l Monitor 3 02
- L Ol)
69—» 02
Controt
1 Comparator
9 8 10 11 Transistor 613
R V f - - Controt Ihhibit Lchg-Putse
9 Stab Io- - Voltage Commutation
- IEBOO358
Block Diagram
Semiconductor Group 2
