CA3059 Ver la hoja de datos (PDF) - ON Semiconductor
Número de pieza
componentes Descripción
Fabricante
CA3059 Datasheet PDF : 6 Pages
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CF
+
100 μF
15 V
−
2
RS
85 k
AC Line
Input
5
CA3059
RP
Inhibit
Input
1
Rx
NTC Sensor
13
10 k
50 k
10
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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