TD3082
Zero-Volt Switching
Triac Driver
DESCRIPTION
The TD3082 consists of a single input LED optically coupled to a zero-volt crossing triac driver. The TD3082 provides high input-to-output
isolation and is designed to drive high-powered triacs. Typical uses include interfacing logic level control signals to equipment powered
from 110Vac and 220Vac lines.
FEATURES
APPLICATIONS
•
•
•
•
•
Zero-volt switching
800V blocking voltage
High input-to-output isolation
High reliability
10mA turn-on current
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•
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Home appliances
Motor control
Solid state relays
Valve control
Solenoids
Exercise equipment
OPTIONS/SUFFIXES
MAXIMUM RATINGS
PARAMETER
Storage Temperature
Operating Temperature
Continuous Input Current
6
+/- AC Outpu
•
•
•
-H
-S
-TR
High Output Isolation
Surface Mount Option
Tape and Reel
UNIT
°C
°C
mA
mA
V
mW
MIN
-55
-40
TYP
MAX
125
85
40
400
SCHEMATIC DIAGRAM
+ Input
1
Transient Input Current
Reverse Input Control
Voltage
Output Power Dissipation
6
500
- Input
2
5
Do Not Use
3
4
-/+ AC Outpu
APPROVALS
rev 1.0
Solid State Optronics, Inc.
1.888.377.4776
www.ssousa.com
TD3082
Zero-Volt Switching
Triac Driver
PERFORMANCE DATA
TD3082
Typical Load Current vs. Temperature
TD3082
Typical Blocking Voltage Distribution
N = 100, Ambient Temperature = 25°C
Load Current (mA)
120
100
80
60
40
20
0
-40
-20
0
20
40
60
80
Tem perature (C)
50
Device Count
40
30
20
10
0
800 810 820 830 840 850 860 870
Blocking Voltage (V)
ZERO-VOLT SWITCHING
This solid state relay has been designed with a driver circuit that controls the operation of two back-to-back silicon controlled rectifiers (SCRs),
each responsible for one half of the AC cycle. If an AC signal is examined, the turn on, turn off and zero-volt switching can be seen. Figure 1
shows a typical 60 Hz, 120Vac signal with a corresponding relay input signal:
1
Relay Input Signal is
Turned On.
5
Relay Input Signal is
Turned Off.
Input Signal
2
SCR #1 Turns On when
5V threshold is reached.
6
SCR #1 and Relay Turn
Off at Zero Volts.
5V
Threshold
3
SCR #1 Turns Off,
SCR #2 Turns On
at Zero Volts.
4
SCR #2 Turns Off,
SCR #1 Turns On
at Zero Volts.
Figure 1 shows the sequence of zero-volt switching operation. At Stage 1, an input signal is applied to the relay. The relay will not turn on
until the threshold voltage of 5V is reached. Once this point is reached (Stage 2), SCR #1 (designated as the SCR which controls positive AC
voltage) turns on. However, SCR #1 only conducts for an instant, as the cycle quickly crosses zero. At this point (Stage 3), SCR #1 will turn
off and SCR #2 (negative AC voltage) turns on. Likewise, at the next zero cross (Stage 4), SCR #2 will turn off and SCR #1 conducts again.
Even though the input signal is terminated at Stage 5, the relay will continue to conduct (typical SCR behavior) until Stage 6, when SCR #1
crosses zero and ceases to conduct. Please note that turn on can likewise begin on the negative phase of the AC cycle with a -5V threshold,
though only the positive phase is shown here.
rev 1.0
Solid State Optronics, Inc.
1.888.377.4776
www.ssousa.com
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