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Timer Control for Triac and Relay
U2100B
Description
The timer control circuit, U2100B, uses bipolar technol-
ogy. It has different mode selections (Zero voltage switch,
Phase control, Relay control). The output stage is
triggered according to input conditions. It can be used in
triac application for two or three wire system as a power
switch.
Features
D Adjustable and retriggerable tracking time
D Window monitoring for sensor input
D Enable input for triggering
D Internal noise suppression (40 ms) and retrigger
blocking (640 ms)
D Two or three wire application
Package: DIP8, SO8
Applications
D Motion detectors
D Touch sensors
D Timer
8
C2
Trigger
signal
6
En-
able
Ct
Rt
5
7
–VRef
0.5 VRef
+
Trigger
window
+
0.6 VRef
Supply voltage
limitation
Voltage control
monitoring
Noise
suppression
40 ms
Retrigger
delay
640 ms
Sync
Mode
selection
Control
logic
0.6 VRef
0.5 VRef
ON
OFF
RC Oscillator
Divider 1:210
2
–VS
4
C1
R1
D1
Rsync
Load
3 RG
Output
1
GND
L
Z
Vmains
N
95 9876
Figure 1. Block diagram with external circuit
TELEFUNKEN Semiconductors
Rev. A1, 30-May-96
1 (9)

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U2100B
Pin Description
GND 1
–VS 2
Output 3
Sync 4
8 VRef
7 Osc
6 TRIG
5 EN
Pin Symbol
Function
1 GND Reference point
2 –VS Supply voltage
3 Output Driver output
4 Sync Synchronisation and mode selection
5 EN Enable
6 TRIG Input trigger signal
7 Osc RC Oscillator
8 VRef Reference voltage
95 9945
General Description
Monostable integrated power control circuit, U2100B,
can be used according to mode selection in relay’s or
triac’s applications. Beyond that, it can be used in triac-
application for two wire system as power switch, (being
the load in series to the switch) whereas the supply
voltage for the control unit is gained from phase rest angle
a( min-operation).
L
Control
N 95 9949
Figure 2. Two wire circuit
L
Control
For three wire switch, two modes of operations are
possible:
– Zero voltage switch operation for triac control
– Static operation for relay control
Mode Selection Pin 4 and Supply Voltage
Pin 2
Operation modes can be selected by external voltage at
the sync. input Pin 4 (clamping). Mode selection deter-
mines the current requirement of driver stage for relay’s
or triac’s and hence the selection of supply voltage.
Zero Voltage Switch Operation, Figure 4
Selection condition:
V4 = internal sync limitation, without external clamping
[R1
0.85
VM–VS
2 Itot
Itot = IS + Ip + IX
whereas:
IS = Supply current of IC without load
IP = Average trigger current IG
IX = External circuit current requirement
VM = Mains voltage
+ ǒ Ǹ ǓRequired firing pulse width tp
wtp 2 arcsin IL VM
P2
N 95 9950
Figure 3. Three wire circuit
whereas:
IL = Triac latching current
P = Power at load Z
W [Rsync[k ] VM[V]
Ǹ ǒ Ǔw2 sin tp[s] – 0.7
1.8 10–2
–176
2 (9) TELEFUNKEN Semiconductors
Rev. A1, 30-May-96

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2
–VS
4
Sync
D1 R1
C1
Rsync
Z
3
Output
1
GND
95 9951
RG
IG
Figure 4.
L
VM
N
U2100B
amin-operation, Figure 6
Selection condition:
–V4 = 6.5 to 7.8 V +V4 = int. limitation
+Ramax
Rsync
3.6 V
VR(peak)–3.6
V
+ ǸRamin
Rsync
10 V
VM 2 –10 V
VR(peak) is the peak voltage of the rest phase angle, which
should be high enough to generate the supply voltage, VS.
DC Operation, Figure 5
Selection condition:
+V4 = 6.1 V –V4 = int. limitation
whereas:
[ ńR0 1 10 Xc
+Xc
0.85
VM–VS
Itot
+ ) )Itot IS IRel IX
+ wC0
1
XC
2
–VS
1
GND
3
Output
4
Sync
BZX85C22V
C1
Rel
IRel
Co
Rsync
4xBYX86
N
VM
230 V~
L
Ro
95 9952
Figure 5.
2
–VS
4
Sync
3
Output
1
GND
D1
IN 4007 Co
Ro
C1
BZX85
C22V
Rsync
Ra 1N4148
BZX55
6V8
RG IG
95 9953
Z
L
VM
230 V~
VR(peak)
N
Figure 6.
C1 =
Co =
Ro =
Rsync =
Ra =
RG =
D1 =
10320.9230003mWkmWFF//3255V0 V
13090kWW
IN 4007
TELEFUNKEN Semiconductors
Rev. A1, 30-May-96
3 (9)