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PDF CA3059 Data sheet ( Hoja de datos )
| Número de pieza | CA3059 | |
| Descripción | ZERO VOLTAGE SWITCH | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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ON Semiconductort
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
CA3059
ZERO VOLTAGE
SWITCH
SEMICONDUCTOR
TECHNICAL DATA
14
1
PLASTIC PACKAGE
CASE 646
RS 5
AC
Input
Limiter
AC
Input
Voltage
12
DC Mode or
400 Hz Input
Power
Supply
Zero
Crossing
Detector
2
VCC
VCC
Current
Boost
RL
3
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
CA3059
TA = – 40° to +85°C Plastic DIP
MT2
100
µF +
RP 14
Protection
Circuit
Triac 4
Drive MT1
Gate
FUNCTIONAL BLOCK
DESCRIPTION
15 -
V
13
9
*
RX 10
11
+
On/Off
Sensing
Amp
-
VCC
* NTC Sensor
Gnd 7
81
Inhibit
6
External Trigger
Figure 1. Representative Block Diagram
AC Input Voltage
(50/60 Hz)
Vac
24
120
208/230
277
Input Series
Resistor (RS)
kΩ
2.0
10
20
25
Dissipation Rating
for RS
W
0.5
2.0
4.0
5.0
1. Limiter–Power Supply — Allows operation of
the CA3059 directly from an AC line. Suggested
dropping resistor (RS) 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, 2001
August, 2001 – Rev. 1
1
Publication Order Number:
CA3059/D
1 page  
CF
100 µF
15 V
+
-
2
AC Line
Input
RS
5
85 k
CA3059
RP
Inhibit
Input
1
Rx
NTC Sensor
13
10 k
10
50 k
70 µA
9
9.6 k
11
8
35 µA
15
3 Current
Boost
25
30 k
30 k
30 k
53 µA
150 µA
5k
50 k 4
To
Thyristor
Gate
12
For DC Mode
or 400 Hz
Operation
14
Fail-Safe
Input
7
To
Common
NOTE: Current sources are established by an internal reference.
Figure 14. Circuit Schematic
6
For
External
Trigger
APPLICATION INFORMATION
Power Supply
The CA3059 is a self–powered circuit, powered from the
AC line through an appropriate dropping resistor (see
Table A). The internal supply is designed to power the
auxiliary power circuits.
In applications where more output current from the
internal supply is required, an external power supply of
higher voltage should be used. To use an external power
supply, connect Pin 5 and Pin 7 together and apply the
synchronizing voltage to Pin 12 and the DC supply voltage
to Pin 2 as shown in Figure 4.
Operation of Protection Circuit
The protection circuit, when connected, will remove
current drive from the triac if an open or shorted sensor is
detected. This circuit is activated by connecting Pin 13 to
Pin 14 (see Figure 1).
The following conditions should be observed when the
protection circuit is utilized:
a. The internal supply should be used and the external
load current must be limited to 2 mA with a 5 kΩ
dropping resistor.
b. Sensor Resistance (RX) and RP values should be
between 2 kΩ and 100 kΩ.
c. The relationship 0.33 < RX/RP < 3 must be met over
the anticipated temperature range to prevent
undesired activation of the circuit. A shunt or series
resistor may have to be added.
External Inhibit Function
A priority inhibit command applied to Pin 1 will remove
current drive from the thyristor. A command of at least
+1.2 V @ 10 µA is required. A DTL or TTL logic 1 applied
to Pin 1 will activate the inhibit function.
DC Gate Current Mode
When comparator operation is desired or inductive loads
are being switched, Pins 7 and 12 should be connected. This
connection disables the zero–crossing detector to permit the
flow of gate current from the differential sensing amplifier
on demand. Care should be exercised to avoid possible
overloading of the internal power supply when operating the
device in this mode. A resistor should be inserted between
Pin 4 and the thyristor gate in order to limit the current.
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CA3059.PDF ] | |
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