CA3059

Manufacturer Part NumberCA3059
DescriptionZERO VOLTAGE CROSSING SWITCH
ManufacturerIntersil
CA3059 datasheet
 


Specifications of CA3059

Rohs StatusRoHS non-compliant  
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Transformer Isolation - In Figure 26, a pulse transformer is
used to provide electrical isolation of the sensor from incom-
ing AC power lines. The pulse transformer T
sensor from terminal No. 1 of the triac Y
T
isolates the CA3059 from the power lines. Capacitor C
2
shifts the phase of the output pulse at terminal No. 4 in order
to retard the gate pulse delivered to triac Y
for the small phase shift introduced by transformer T
Many applications require line isolation but not zero-voltage
switching. A line isolated temperature controller for use with
inductive or resistive loads that does not include zero-volt-
age switching is shown in Figure 27.
In temperature monitoring or control applications the sensor
R
4
8
SENSOR
A
FIGURE 27. A LINE ISOLATED TEMPERATURE CONTROLLER FOR USE WITH INDUCTIVE OR RESISTIVE LOADS; THIS CONTROLLER
DOES NOT INCLUDE ZERO-VOLTAGE SWITCHING.
120VAC
60Hz
INPUT
Application Note 6182
may be a temperature dependent element such as a resis-
tor, thermistor, or diode. The load may be a lamp, bell, horn,
isolates the
recorder or other appropriate device connected in a feed-
1
, and transformer
back relationship to the sensor.
1
1
For the purpose of the following explanation, assume that
the sensor is a resistor having a negative temperature coeffi-
to compensate
1
cient and that the load is a heater thermally coupled to the
.
1
sensor, the object being to maintain the thermal coupling
medium at a desired reference temperature. Assume initially
that the temperature at the coupling medium is low.
The operating potentials applied to the bridge circuit produce
a common mode potential, V
CA3094. Assuming the bridge to have been initially bal-
V+
(EXT)
3.3K
(NOTE 1)
R
7
2
200K
1K
8
1W
R
3
R
1
5
+
3
6
CA3094
100
2
2
-
1
1
SPRAGUE
4
11Z15
NOTE:
5K
2
5
10 11 13
3
10K
ZVS
100 F
9
5K
7
8
PHOTO
COUPLED
ISOLATOR
13
, at the input terminals of the
CM
LOAD
(NOTE 2)
INPUT
6.8K
0.001
F
1. R
Determines Drive to TRIAC.
2
2. Snubber for Light Inductive Loads.
LOAD
MT
2
Y
1
4
MT
1