U2100B
| Model | U2100B |
| Description | Timer Control for Triac and Relay |
| PDF file | Total 9 pages (File size: 131K) |
| Chip Manufacturer | TEMIC |
U2100B
Pin Description
GND
–V
S
Output
Sync
1
8
V
Ref
Osc
TRIG
Pin
1
2
3
4
5
6
7
8
Symbol
GND
–V
S
Output
Sync
EN
TRIG
Osc
V
Ref
Function
Reference point
Supply voltage
Driver output
Synchronisation and mode selection
Enable
Input trigger signal
RC Oscillator
Reference voltage
2
7
3
6
4
95 9945
5
EN
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
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.
Control
Zero Voltage Switch Operation, Figure 4
Selection condition:
V
4
= internal sync limitation, without external clamping
R
1
N
95 9949
[
0.85 V2 –V
I
M
tot
S
I
tot
= I
S
+ I
p
+ I
X
Figure 2. Two wire circuit
L
whereas:
= Supply current of IC without load
I
S
= Average trigger current I
G
I
P
I
X
= External circuit current requirement
V
M
= Mains voltage
Required firing pulse width t
p
2
+
w
arcsin
Control
t
p
I
L
P
V
M
2
whereas:
= Triac latching current
I
L
P
= Power at load Z
N
95 9950
Figure 3. Three wire circuit
R
sync
[k
W
]
[
V [V]
M
2 sin
1.8
w
t
p
[s] – 0.7
10
–2
–176
2 (9)
TELEFUNKEN Semiconductors
Rev. A1, 30-May-96
