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Datasheet: TCA785 (Siemens Semiconductor Group)

Phase Control Ic

 

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Siemens Semiconductor Group
Semiconductor Group
1
TCA 785
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.
This IC replaces the previous types TCA 780 and TCA 780 D.
(top view)
Pin Configuration
Phase Control IC
TCA 785
Bipolar 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
P-DIP-16-1
Type
Ordering Code
Package
TCA 785
Q67000-A2321
P-DIP-16-1
Pin
Symbol
Function
1
GND
Ground
2
3
4
Q2
Q U
Q2
Output 2 inverted
Output U
Output 1 inverted
5
V
SYNC
Synchronous voltage
6
7
I
Q Z
Inhibit
Output Z
8
V
REF
Stabilized voltage
9
10
R
9
C
10
Ramp resistance
Ramp capacitance
11
V
11
Control voltage
12
C
12
Pulse extension
13
L
Long pulse
14
15
Q 1
Q 2
Output 1
Output 2
16
V
S
Supply voltage
Pin Definitions and Functions
09.94
Semiconductor Group
2
TCA 785
Functional Description
The synchronization signal is obtained via a high-ohmic resistance from the line voltage
(voltage
V
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
C
10
of which is charged
by a constant current (determined by
R
9
). If the ramp voltage
V
10
exceeds the control voltage
V
11
(triggering angle
), a signal is processed to the logic. Dependent on the magnitude of the
control voltage
V
11
, the triggering angle
can be shifted within a phase angle of 0 to 180.
For every half wave, a positive pulse of approx. 30
s duration appears at the outputs Q 1 and
Q 2. The pulse duration can be prolonged up to 180 via a capacitor
C
12
. If pin 12 is connected
to ground, pulses with a duration between
and 180 will result.
Outputs
and
supply the inverse signals of Q 1 and Q 2.
A signal of
+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
,
.
Pin 13 can be used to extend the outputs
and
to full pulse length (180
).
Q 1
Q 2
Q 1
Q 2
Q 1
Q 2
Block Diagram
Semiconductor Group
3
TCA 785
Pulse Diagram
Semiconductor Group
4
TCA 785
Unit
Parameter
Symbol
min.
max.
Limit Values
Absolute Maximum Ratings
V
Supply voltage
V
S
0.5
18
mA
Output current at pin 14, 15
I
Q
10
400
K/W
Thermal resistance
system - air
R
th SA
80
V
V
V
Inhibit voltage
Control voltage
Voltage short-pulse circuit
V
6
V
11
V
13
0.5
0.5
0.5
V
S
V
S
V
S
A
Synchronization input current
V
5
200
200
V
Output voltage at pin 14, 15
V
Q
V
S
mA
Output current at pin 2, 3, 4, 7
I
Q
10
V
Output voltage at pin 2, 3, 4, 7
V
Q
V
S
C
C
Junction temperature
Storage temperature
T
j
T
stg
55
150
125
Operating Range
V
Supply voltage
V
S
8
18
Hz
Operating frequency
f
10
500
C
Ambient temperature
T
A
25
85
Characteristics
8
V
S
18 V; 25 C
T
A
85 C;
f
= 50 Hz
Unit
Parameter
Symbol
min.
max.
Limit Values
Test
Circuit
typ.
mA
Supply current consumption
S1 ... S6 open
V
11
= 0 V
C
10
= 47 nF;
R
9
= 100 k
I
S
4.5
1
6.5
10
A
mV
Synchronization pin 5
Input current
R
2
varied
Offset voltage
I
5 rms
V
5
30
1
4
30
200
75
V
k
Control input pin 11
Control voltage range
Input resistance
V
11
R
11
0.2
1
5
15
V
10 peak
Semiconductor Group
5
TCA 785
Characteristics (cont'd)
8
V
S
18 V; 25 C
T
A
85 C;
f
= 50 Hz
Unit
Parameter
Symbol
min.
max.
Limit Values
Test
Circuit
typ.
A
V
mV
k
s
Ramp generator
Charge current
Max. ramp voltage
Saturation voltage at capacitor
Ramp resistance
Sawtooth return time
I
10
V
10
V
10
R
9
t
f
10
100
3
1
1.6
1
1
225
80
1000
V
2
2
350
300
V
V
s
A
A
Inhibit pin 6
switch-over of pin 7
Outputs disabled
Outputs enabled
Signal transition time
Input current
V
6
= 8 V
Input current
V
6
= 1.7 V
V
6 L
V
6 H
t
r
I
6 H
I
6 L
4
1
80
1
1
1
1
1
3.3
3.3
500
150
2.5
5
800
200
V
V
A
A
Long pulse switch-over
pin 13
switch-over of S8
Short pulse at output
Long pulse at output
Input current
V
13
= 8 V
Input current
V
13
= 1.7 V
V
13 H
V
13 L
I
13 H
I
13 L
3.5
45
1
1
1
1
2.5
2.5
65
2
10
100
%
%
%
Deviation of
I
10
R
9
= const.
V
S
= 12 V;
C
10
= 47 nF
Deviation of
I
10
R
9
= const.
V
S
= 8 V to 18 V
Deviation of the ramp voltage
between 2 following
half-waves,
V
S
= const.
I
10
I
10
V
10 max
5
20
1
1
1
5
20
A
V
Outputs pin 2, 3, 4, 7
Reverse current
V
Q
=
V
S
Saturation voltage
I
Q
= 2 mA
I
CEO
V
sat
0.1
2.6
2.6
0.4
10
2
Semiconductor Group
6
TCA 785
Characteristics (cont'd)
8
V
S
18 V; 25 C
T
A
85 C;
f
= 50 Hz
Unit
Parameter
Symbol
min.
max.
Limit Values
Test
Circuit
typ.
V
V
s
s/
nF
Outputs pin 14, 15
H-output voltage
I
Q
= 250 mA
L-output voltage
I
Q
= 2 mA
Pulse width (short pulse)
S9 open
Pulse width (short pulse)
with
C
12
V
14/15 H
V
14/15 L
t
p
t
p
V
S
3
0.3
20
530
3.6
2.6
1
1
V
S
2.5
0.8
30
620
V
S
1.0
2
40
760
V
1/K
Internal voltage control
Reference voltage
Parallel connection of
10 ICs possible
TC
of reference voltage
V
REF
REF
2.8
1
1
3.1
2
10
4
3.4
5
10
4
Semiconductor Group
7
TCA 785
Pulse Extension versus Temperature
Ramp capacitance
Triggering point
Charge current
The minimum and maximum values of
I
10
are to be observed
min
max
t
Tr
=
C
10
500 pF
1
F
1)
2)
I
10
=
2)
V
11
R
9
C
10
V
REF
K
V
REF
K
R
9
V
10 max
=
V
S
2 V
V
10
=
V
REF
K
t
R
9
C
10
2)
Ramp voltage
Application Hints for External Components
1)
Attention to flyback times
2)
K
= 1.10
20 %
Semiconductor Group
8
TCA 785
Supply Current versus Supply Voltage
Output Voltage measured to +
V
S
Semiconductor Group
9
TCA 785
Test Circuit 1
It is necessary for all measurements to adjust the ramp with
the aid of
C
10
and
R
9
in the way that 3 V
V
ramp max
V
S
2 V
e.g.
C
10
= 47 nF; 18 V:
R
9
= 47 k
; 8 V:
R
9
= 120 k
Semiconductor Group
10
TCA 785
Test Circuit 2
Test Circuit 3
The remaining pins are connected as in test circuit 1
The remaining pins are connected as in test circuit 1
Semiconductor Group
11
TCA 785
Test Circuit 4
Remaining pins are connected as in test circuit 1
The 10
F capacitor at pin 5 serves only for test purposes
Test Circuit 5
Test Circuit 6
Semiconductor Group
12
TCA 785
Inhibit 6
Long Pulse 13
Pulse Extension 12
Reference Voltage 8
Semiconductor Group
13
TCA 785
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 180 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 15. During the negative half-wave, it also receives a positive
trigger pulse from pin 14. The trigger pulse width is approx. 100
s.
Application Examples
Triac Control for up to 50 mA Gate Trigger Current
Semiconductor Group
14
TCA 785
Shown is the possibility to trigger two antiparalleled thyristors with one IC TCA 785. The trigger
pulse can be shifted continuously within a phase angle between 0 and 180 by means of a
potentiometer. During the negative line half-wave the trigger pulse of pin 14 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 15.
Fully Controlled AC Power Controller
Circuit for Two High-Power Thyristors
Semiconductor Group
15
TCA 785
Half-Controlled Single-Phase Bridge Circuit with Trigger Pulse Transformer and Direct
Control for Low-Power Thyristors
Semiconductor Group
16
TCA 785
Half-Controlled Single-Phase Bridge Circuit with Two Trigger Pulse Transformers for
Low-Power Thyristors
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