tca785.pdf

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TCA 785
Phase Control IC
TCA 785
Bipolar IC
Features
l
Reliable recognition of zero passage
l
Large application scope
l
May be used as zero point switch
l
LSL compatible
l
Three-phase operation possible (3 ICs)
l
Output current 250 mA
l
Large ramp current range
P-DIP-16-1
l
Wide temperature range
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 ˚. 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
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
Pin Configuration
14
15
Q 1
Q 2
Output 1
Output 2
(top view)
16
V S
Supply voltage
Semiconductor Group
1
09.94
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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 j ), a signal is processed to the logic. Dependent on the magnitude of the
control voltage V 11 , the triggering angle j can be shifted within a phase angle of 0˚ to 180˚.
For every half wave, a positive pulse of approx. 30 m 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 j and 180˚ will result.
Outputs and supply the inverse signals of Q 1 and Q 2.
A signal of j +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 2
Q 1
,
Q 2
.
Pin 13 can be used to extend the outputs
Q 1
and
Q 2
to full pulse length (180˚ – j ).
Block Diagram
Semiconductor Group
2
Q 1
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TCA 785
Pulse Diagram
Semiconductor Group
3
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TCA 785
Absolute Maximum Ratings
Parameter
Symbol
Limit Values
Unit
min.
max.
Supply voltage
V S
– 0.5
18
V
Output current at pin 14, 15
I Q
– 10
400
mA
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
V
V
V
Synchronization input current
V 5
– 200
± 200
m A
Output voltage at pin 14, 15
V Q
V S
V
Output current at pin 2, 3, 4, 7
I Q
10
mA
Output voltage at pin 2, 3, 4, 7
V Q
V S
V
Junction temperature
Storage temperature
T j
T stg
– 55
150
125
˚C
˚C
Thermal resistance
system - air
R th SA
80
K/W
Operating Range
Supply voltage
V S
8
18
V
Operating frequency
f
10
500
Hz
Ambient temperature
T A
– 25
85
˚C
Characteristics
8 £ V S
£ 85 ˚C; f = 50 Hz
Parameter
Symbol
Limit Values
Unit
Test
Circuit
min.
typ.
max.
Supply current consumption
S1 … S6 open
V 11 = 0 V
C 10 = 47 nF; R 9 = 100 k W
I S
4.5
6.5
10
mA
1
Synchronization pin 5
Input current
R 2 varied
Offset voltage
I 5 rms
30
200
m A
1
D V 5
30
75
mV
4
Control input pin 11
Control voltage range
Input resistance
V 11
R 11
0.2
V 10 peak
V
k W
1
5
15
Semiconductor Group
4
£ 18 V; – 25 ˚C £ T A
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TCA 785
Characteristics (cont’d)
8 £ V S
£ 85 ˚C; f = 50 Hz
Parameter
Symbol
Limit Values
Unit
Test
Circuit
min.
typ.
max.
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
1000
V 2 – 2
350
300
m A
V
mV
k W
m s
100
3
225
1
1.6
1
1
80
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
3.3
3.3
2.5
V
V
m s
m A
1
1
1
1
4
1
5
800
500
– I 6L
80
150
200
m A
1
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
– 5
5
%
1
I 10
– 20
20
%
1
D V 10 max
± 1
%
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
3.5
2.5
2.5
V
V
m A
1
1
1
2
10
– I 13 L
45
65
100
m A
1
Outputs pin 2, 3, 4, 7
Reverse current
V Q = V S
Saturation voltage
I Q = 2 mA
I CEO
10
m A
2.6
V sat
0.1
0.4
2
V
2.6
Semiconductor Group
5
£ 18 V; – 25 ˚C £ T A
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