CA3059 Intersil, CA3059 Datasheet - Page 13

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CA3059

Manufacturer Part Number
CA3059
Description
ZERO VOLTAGE CROSSING SWITCH
Manufacturer
Intersil
Datasheet

Specifications of CA3059

Rohs Status
RoHS 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
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
FIGURE 27. A LINE ISOLATED TEMPERATURE CONTROLLER FOR USE WITH INDUCTIVE OR RESISTIVE LOADS; THIS CONTROLLER
2
isolates the CA3059 from the power lines. Capacitor C
DOES NOT INCLUDE ZERO-VOLTAGE SWITCHING.
A
R
4
SENSOR
120VAC
60Hz
8
INPUT
3
2
100 F
1
, and transformer
1
CA3094
+
-
7
to compensate
Application Note 6182
1
10K
4
8
5K
isolates the
3.3K
SPRAGUE
R
5
3
9
2
11Z15
1
.
(NOTE 1)
PHOTO
COUPLED
ISOLATOR
6
1K
R
2
3
5K
1
1
13
ZVS
5
2
may be a temperature dependent element such as a resis-
tor, thermistor, or diode. The load may be a lamp, bell, horn,
recorder or other appropriate device connected in a feed-
back relationship to the sensor.
For the purpose of the following explanation, assume that
the sensor is a resistor having a negative temperature coeffi-
cient and that the load is a heater thermally coupled to the
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-
1
10 11 13
7
(EXT)
200K
1W
R
8
V+
100
1
NOTE:
1. R
2. Snubber for Light Inductive Loads.
LOAD
2
4
Determines Drive to TRIAC.
LOAD
6.8K
0.001
F
(NOTE 2)
MT
MT
CM
2
1
Y
, at the input terminals of the
1
INPUT

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