CA3059_06 Datasheet, PDF (1/6 Pages) ON Semiconductor – Zero Voltage Switch

CA3059
Zero Voltage Switch
This series is designed for thyristor control in a variety of AC power
switching applications for AC input voltages of 24 V, 120 V,
208/230 V, and 277 V @ 50/60 Hz.
Applications:
• Relay Control
• Valve Control
• Heater Control
• Lamp Control
• On−Off Motor Switching
• Differential Comparator with Self−Contained Power Supply for
Industrial Applications
• Synchronous Switching of Flashing Lights
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ZERO VOLTAGE SWITCH
SEMICONDUCTOR
TECHNICAL DATA
R_S
5
AC
Input
Limiter
AC
Input
Voltage
100
μF ₊
15 ^−
V
*
R_X
12
DC Mode or
400 Hz Input
R_P 14
Protection
Circuit
13
+
On/Off
Sensing
Amp
9
−
10
V_CC
11
Power
Supply
Zero
Crossing
Detector
2
V_CC
V_CC
Current ^RL
Boost 3
MT2
Triac
4
Drive
MT1
Gate
* NTC Sensor
Gnd 7
8
1
Inhibit
6
External Trigger
Figure 1. Representative Block Diagram
AC Input Voltage
(50/60 Hz)
Vac
24
120
208/230
277
Input Series
Resistor (R_S)
kΩ
2.0
10
20
25
Dissipation Rating
for R_S
W
0.5
2.0
4.0
5.0
14
1
PLASTIC PACKAGE
CASE 646
ORDERING INFORMATION
Operating
Device Temperature Range
Package
CA3059 T_A = − 40° to +85°C Plastic DIP
FUNCTIONAL BLOCK
DESCRIPTION
1. Limiter−Power Supply — Allows operation of
the CA3059 directly from an AC line. Suggested
dropping resistor (R_S) values are given in the table
below.
2. Differential On/Off Sensing Amplifier — Tests
for condition of external sensors or input command
signals. Proportional control capability or hysteresis
may be implemented using this block.
3. Zero−Crossing Detector — Synchronizes the
output pulses to the zero voltage point of the AC cycle.
This synchronization eliminates RFI when used with
resistive loads.
4. Triac Drive — Supplies high−current pulses to
the external power controlling thyristor.
5. Protection Circuit — A built−in circuit may be
actuated, if the sensor opens or shorts, to remove the
drive current from the external triac.
6. Inhibit Capability — Thyristor firing may be
inhibited by the action of an internal diode gate at
Pin 1.
7. High Power DC Comparator Operation —
Operation in this mode is accomplished by connecting
Pin 7 to Pin 12 (thus overriding the action of the
zero−crossing detector). When Pin 13 is positive with
respect to Pin 9, current to the thyristor is continuous.
© Semiconductor Components Industries, LLC, 2006
1
July, 2006 − Rev. 2
Publication Order Number:
CA3059/D