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CA3059, CA3079
Zero-Voltage Switches for 50Hz-60Hz and
400Hz Thyristor Control Applications
Description
The CA3059 and CA3079 zero-voltage switches are mono-
lithic silicon integrated circuits designed to control a thyristor
in a variety of AC power switching applications for AC input
voltages of 24V, 120V, 208/230V, and 277V at 50Hz-60Hz
and 400Hz. Each of the zero-voltage switches incorporates
4 functional blocks (see the Functional Block Diagram) as
follows:
1. Limiter-Power Supply - Permits operation directly from an
AC line.
2. Differential On/Off Sensing Amplifier - Tests the condition
of external sensors or command signals. Hysteresis or
proportional-control capability may easily be implement-
ed in this section.
3. Zero-Crossing Detector - Synchronizes the output pulses
of the circuit at the time when the AC cycle is at zero volt-
age point; thereby eliminating radio-frequency interfer-
ence (RFI) when used with resistive loads.
4. Triac Gating Circuit - Provides high-current pulses to the
gate of the power controlling thyristor.
In addition, the CA3059 provides the following important
auxiliary functions (see the Functional Block Diagram).
1. A built-in protection circuit that may be actuated to remove
drive from the triac if the sensor opens or shorts.
10
2. Thyristor firing may be inhibited through the action of an
internal diode gate connected to Terminal 1.
3. High-power dc comparator operation is provided by over-
riding the action of the zero-crossing detector. This is ac-
complished by connecting Terminal 12 to Terminal 7.
Gate current to the thyristor is continuous when Terminal
13 is positive with respect to Terminal 9.
The CA3059 and CA3079 are supplied in 14 lead dual-in-
line plastic packages.
Features
鈥?Relay Control
鈥?Valve Control
鈥?Synchronous Switching of Flashing Lights
鈥?On-Off Motor Switching
鈥?Differential Comparator with Self-Contained Power
Supply for Industrial Applications
鈥?Photosensitive Control
鈥?Power One-Shot Control
鈥?Heater Control
鈥?Lamp Control
Type Features
鈥?24V, 120V, 208/230V, 277V at 50/60 . . .
or 400Hz Operation
鈥?Differential Input . . . . . . . . . . . . . . . . . .
鈥?Low Balance Input Current (Max) -
碌A(chǔ).
. .
鈥?Built-In Protection Circuit for . . . . . . . .
Opened or Shorted Sensor (Term 14)
鈥?DC Mode (Term 12) . . . . . . . . . . . . . . . .
鈥?External Trigger (Term 6) . . . . . . . . . . .
鈥?External Inhibit (Term 1) . . . . . . . . . . . .
鈥?DC Supply Volts (Max) . . . . . . . . . . . . .
鈥?Operating Temperature Range (
o
C) . . .
CA3059 CA3079
X
X
1
X
X
X
2
X
鈥?Sensor Range (Rx) - k鈩? . . . . . . . . . . . . 2 - 100 2 - 50
X
X
X
14
-55 to +125
Ordering Information
PART NUMBER
CA3059
CA3079
TEMPERATURE
-55
o
C to +125
o
C
-55
o
C to +125
o
C
PACKAGE
14 Lead Plastic DIP
14 Lead Plastic DIP
Pinouts
CA3059 (PDIP)
TOP VIEW
INHIBIT 1
DC SUPPLY 2
HIGH CURRENT 3
NEG. TRIGGER
TRIGGER OUT 4
AC IN 5
TRIGGER IN 6
COMMON 7
14 FAIL-SAFE
13 SENSE AMP IN
12 ZCD OVERRIDE
11 R DRIVER (COM)
10 R DRIVER V
+
9 SENSE AMP REF
8 COMMON
DO NOT USE 1
DC SUPPLY 2
HIGH CURRENT 3
NEG. TRIGGER
TRIGGER OUT 4
AC IN 5
DO NOT USE 6
COMMON 7
CA3079 (PDIP)
TOP VIEW
14 DO NOT USE
13 SENSE AMP IN
12 DO NOT USE
11 R DRIVER (COM)
10 R DRIVER V
+
9 SENSE AMP REF
8 COMMON
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2002. All Rights Reserved
FN490.5
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