鈭?/div>
40擄 to +85擄C
Package
Plastic DIP
13
9
*
R
X
10
11
FUNCTIONAL BLOCK
DESCRIPTION
1.
Limiter鈭扨ower Supply
鈥?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
鈥?Tests
for condition of external sensors or input command
signals. Proportional control capability or hysteresis
may be implemented using this block.
3.
Zero鈭扖rossing Detector
鈥?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
鈥?Supplies high鈭抍urrent pulses to
the external power controlling thyristor.
5.
Protection Circuit
鈥?A built鈭抜n circuit may be
actuated, if the sensor opens or shorts, to remove the
drive current from the external triac.
6.
Inhibit Capability
鈥?Thyristor firing may be
inhibited by the action of an internal diode gate at
Pin 1.
7.
High Power DC Comparator Operation
鈥?/div>
Operation in this mode is accomplished by connecting
Pin 7 to Pin 12 (thus overriding the action of the
zero鈭抍rossing detector). When Pin 13 is positive with
respect to Pin 9, current to the thyristor is continuous.
8
* NTC Sensor
Gnd
7
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
)
k惟
2.0
10
20
25
Dissipation Rating
for R
S
W
0.5
2.0
4.0
5.0
漏
Semiconductor Components Industries, LLC, 2006
July, 2006
鈭?/div>
Rev. 2
1
Publication Order Number:
CA3059/D
1
2
3
4
5
6
