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Fairchild Semiconductor Electronic Components Datasheet

UA742 Datasheet

ZERO-CROSSING AC TRIGGER-TRIGAC

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p.A742
ZERO-CROSSING AC TRIGGER-TRIGAC
FAIRCHILD LINEAR INTEGRATED CIRCUITS
GENERAL DESCRIPTION - The p.A742 is a monolithic Zero-Crossing AC Trigger (TRIGAC)
utilizing the Fairchild Planar* Epitaxial Process. It is intended for use in ae power control circuits
for operation directly off the ac line or with a separate ac or de power supply. The TRIGAC functions
as a threshold detector and a driver for triacs and SCA's. As a threshold detector, it senses level
changes at the inputs and as a driver it supplies high energy pulses for thyristor triggering. The trigger
pulses occur at the zero crossing of the load current and therefore minimize RFI generation for either
resistive or inductive loads
• DESIGNED FOR APPLICATIONS IN 60Hz TO 400 Hz AC POWER CONTROL SYSTEMS
HAVING RESISTIVE OR INDUCTIVE LOADS
• OPERATES DIRECTLY FROM AN AC LINE OR FROM A DC SUPPLY
• INPUT COMPATIBLE WITH A WIDE RANGE OF SENSOR IMPEDANCES
• BRIDGE SENSING WITH ADJUSTABLE HYSTERESIS SET POINTS
• PROVISIONS FOR TIME PROPORTIONING OPERATION
• PROVIDES ZERO CROSSING THYRISTOR TRIGGERING FOR MINIMUM RFI
• EVEN NUMBER OF CONSECUTIVE HALF-CYCLE TRIGGERINGS FOR TRIACS AND
INVERSE PARALLEL SCR's IN MOST APPLICATIONS
ABSOLUTE MAXIMUM RATINGS
Peak Current into Supply Terminal (ac Operation)
Continuous Current into Supply Terminal (de Operation)
RMS Current into Sync Input Terminal
Current into .Switch Terminal
Power Dissipation
Voltage at (+) or (-) Input Terminal
Differential Voltage between (+) and (-) Input Terminals
Current into Clamp Terminal (Clamp ON)
Voltage at Clamp Terminal (Clamp OFF)
Operating Temperature Range
Storage Temperature Range
Pin Temperature
Hermetic DIP (Soldering, 60 s)
Molded DIP (Soldering, 10 s)
Trigger Output Short-Circuit Duration (Note 2)
±30mA
20mA
15mA
10mA
670mW
(Note 11
±7V
20mA
25V
O'C to +70'C
_65' C to +150' C
300'C
260'C
Continuous
EQUIVALENT CIRCUIT
CONNECTION DIAGRAM
14-PIN DIP
(TOP VIEW)
PACKAGE OUTLINES 6A 9A
PACKAGE CODES D P
MEMORY
-IN
+IN
MEMORY
SWITCH
GATE
SWITCH
CLAMP
GND
ORDER INFORMATION
TYPE
PART NO.
p.A742C
p.A742PC
p.A742C
p.A742DC
SUPPLY~~--~--~~~-'---1~--~~VV~t----------------------------------------------1~1~106~~~~
1-1 INPUT o.::+-r>l-~-f----r:
MEMORY <r+----...J
MEMORV<r+-----,
(+)INPUT
Notes on following pages.
CLAMP
SWITCH
GATE
SWITCH STORAGE
7-46
·Planar is a patented Fairchild process.


Fairchild Semiconductor Electronic Components Datasheet

UA742 Datasheet

ZERO-CROSSING AC TRIGGER-TRIGAC

No Preview Available !

FAIRCHILD. fJ.A742
IlA742C
ELECTRICAL CHARACTERISTICS: TA = 25°C, Voltage Range at the (+) and (-) Input Terminals 2.5V to 17V;
V (+) Input - V H Input;;' 50mV, Test Circu it 1, unless otherwise specified.
CHARACTERISTICS
CONDITION
MIN
TYP
Peak Supply Voltage
Peak Trigger Output Pu lse
Bias Current at (+) and (-) Terminals
Input Threshold Voltage for Output Pulse
Enable
ON Voltage at Clamp Terminal
ON Voltage at Switch Terminal
Switching Voltage at Switch Terminal
Switching Current at Switch Terminal
Holding Current at Switch Terminal
ON Voltage at Sync Input Terminal
Switching Voltage at Sync Input Terminal
Sync Input Threshold Current for
Trigger Output
Sync Input Threshold Voltage for
Trigger Output
S1 in dc position
S1 in ac position. positive half cycles
of ac line
S1 in ac position, negative half cycle
of ac line
S1 in ae position, beginning of positive
half cycles
S1 in ac or dc position, beginning of
negative half cycles
S1 in dc position beginning of positive
half cycles
19
19
-1.6
0.6
1.0
1.6
17 = 1 mA
16- 5 mA
-50
6.0
'1O- 1OmA
11O--1OmA
110 - 2 mA, positive half cycles,
V(_) Input - V(+) Input> 50 mV
110 -2 mA, negative half cycles,
VH Input - V(+) Input> 50 mV
Beginning of positive half cycles
Beginning of negative half cycles
Beginning of positive half cycles
Beginning of negative half cycles
-2.2
4.5
180
-500
2.0
-4.0
21
21
-0.95
0.9
1.3
2.0
15
-35
85
2.6
7.2
15
23
1.9
-1.9
5.8
-7.0
410
-280
2.7
-3.3
MAX
26
26
-0.8
25
50
200
3.0
200
2.2
-4.5
500
-180
4.0
-2.0
UNITS
V
V
V
A
A
A
p.A
mV
mV
V
V
p.A
p.A
V
V
V
V
p.A
p.A
V
V
DEFINITIONS
VOLTAGE RANGE: The range of voltage on the (+) or (-) input terminals, which, if exceeded, could cause the TR IGAC to cease functioning.
BIAS CURRENT: The average of the two currents into the (+) and (-) input terminals.
NOTES:
(1) The maximum voltage should not exceed the instantaneous supply voltage of the p,A 742.
(2) Rating applies for an external storage capacitor having a value of not more than 21JF.
7-47


Part Number UA742
Description ZERO-CROSSING AC TRIGGER-TRIGAC
Maker Fairchild
Total Page 6 Pages
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