Features
•
•
•
•
•
Adjustable and Retriggerable Tracking Time
Window Monitoring for Sensor Input
Enable Input for Triggering
Internal Noise Suppression (40 ms) and Retrigger Blocking (640 ms)
Two- or Three-wire Applications
Applications
•
Motion Detectors
•
Touch Sensors
•
Timers
Timer Control
for Triac and
Relay
U2100B
Description
The timer control circuit U2100B uses bipolar technology. It has different mode selec-
tions (zero voltage switch, phase control and relay control). The output stage is
triggered according to input conditions. It can be used in triac application for two- or
three-wire systems as a power switch.
Rev. 4769B–INDCO–12/04
Figure 1.
Block Diagram with External Circuit
8
C
2
0.5 V
Ref
+
-
Trigger
signal
6
-V
Ref
Supply voltage
limitation
Voltage control
monitoring
Sync
Mode
selection
2
-V
S
4
C
1
L
R
1
R
sync
Load
Z
D
1
Trigger
window
+
-
Noise
suppression
40 ms
Retrigger
delay
640 ms
Control
logic
3
Output
R
G
V
mains
5
0.65 V
Ref
1
GND
N
Enable
0.6 V
Ref
C
t
0.5 V
Ref
7
RC Oscillator
R
t
Divider 1:2
10
ON
OFF
2
U2100B
4769B–INDCO–12/04
U2100B
Pin Configuration
Figure 2.
Pinning DIP8/SO8
GND
-VS
OUTPUT
SYNC
1
2
8
7
VREF
OSC
TRIG
EN
U2100B
3
4
6
5
Pin Description
Pin
1
2
3
4
5
6
7
8
Symbol
GND
-VS
OUTPUT
SYNC
EN
TRIG
OSC
VREF
Function
Reference point
Supply voltage
Driver output
Synchronization and mode selection
Enable
Input trigger signal
RC oscillator
Reference voltage
General Description
The monostable integrated power-control circuit U2100B can be used according to the
mode selection in relay or triac applications. In addition, it can be used in triac applica-
tions for two-wire systems as power switch (the load in series to the switch), where the
supply voltage for the control unit is gained from the remaining phase angle
(α
min
operation).
Figure 3.
Two-wire Circuit
L
Control
N
3
4769B–INDCO–12/04
Figure 4.
Three-wire Circuit
L
Control
N
For three-wire switch systems, two operational modes are possible:
–
–
Zero voltage switch operation for triac control
Static operation for relay control
Mode Selection Pin 4 and
The operational modes can be selected by the external voltage at the synchronous input
pin 4 (clamping). The mode selection determines the current requirement of the relay's
Supply Voltage Pin 2
or triac's driver stage and hence the selection of the supply voltage.
Zero Voltage Switch
Operation (Figure 5)
Selection condition:
V
4
= internal synchronous limitation, without external clamping
V
M
–
V
S
-
R
1
≈
0.85
--------------------
2 I
tot
I
tot
= I
S
+ I
p
+ I
X
where:
I
S
I
P
I
X
V
M
= Supply current of the IC without load
= Average trigger current I
G
= External circuit current requirement
= Mains voltage
Required firing pulse width t
p
I
L
×
V
M
2
-
t
p
= --
arcsin
⎛
-------------------
⎞
⎝
P
×
2
⎠
ω
where:
I
L
P
= Triac latching current
= Power at load Z
V
M
[V]
×
2sin
( ω ×
t
p
[s]
)
–
0.7
R
sync
[kΩ]
≈
-------------------------------------------------------------------------------- –
176
-
-2
1.8
×
10
4
U2100B
4769B–INDCO–12/04
U2100B
Figure 5.
Zero Voltage Switch Operation
D
1
2
-V
S
R
1
L
C
1
4
Sync
R
sync
Z
V
M
3
Output
1
GND
R
G
I
G
N
DC Operation
Selection condition (Figure 6):
+V
4
= 6.1 V
where:
R
0
≈
1/10 X
c
V
M
–
V
S
-
X
c
=
0.85
--------------------
I
tot
-V
4
= internal limitation
I
tot
= I
S
+ I
Rel
+ I
X
1
C
0
= -----------------
ω ×
X
C
Figure 6.
DC Operation
2
-V
S
1
GND
C
1
22 V
N
V
M
Rel
C
0
R
0
I
Rel
R
sync
230 V~
L
3
Output
4
Sync
5
4769B–INDCO–12/04
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