U2102B
| Model | U2102B |
| Description | Multifunction Timer |
| PDF file | Total 16 pages (File size: 206K) |
| Chip Manufacturer | TEMIC |
U2102B
In the case of ac loads, it is necessary to make a distinction
for power supply purposes between the individual
operating modes. In reverse phase control mode, figure 4,
Pin 15 must be additionally supplied with power via a
dropping resistor, since no current flows in Pin 16 when
the power switch is switched on. Here, the dropping
resistor, R
1
, is connected before the rectifier bridge and
therefore has only one mains half-wave. R
1
is then calcu-
lated as follows:
R
1max
+
0.85
@
V2
@
I–V
Nmin
tot
S
Load
R
sync
Sync.
16
R
1
+V
S
15
Voltage
limitation
Push
pull
14
Temp.
monit.
GND
13
95 9883
V
mains
D
1
C
1
IGBT
R
G
R
sh
Figure 4.
Power supply in reverse phase
control mode for ac loads
In two-wire systems, the additional power supply at
Pin 15 is not possible (see figure 4, by omitting R
1
and
Diode D
1
). In this case, the resistor R
sync
is identical with
R
1
and should be as low as the power dissipation allows
it. A sufficiently large residual phase angle must remain
in this case in order to guarantee the device supply.
The power supply is simplified if the device is operated
as a static zero-voltage switch for ac loads (see figure 5).
All delay times are twice as long here, since synchro-
nization of the module is tapped before the rectifier
bridge.
Load
R
1
= R
sync
Sync.
16
V
mains
+V
S
15
Voltage
limitation
Push
pull
14
Temp.
monit.
GND
13
95 9884
C
1
IGBT
R
G
R
sh
Figure 5.
Power supply as static zero
voltage switch for ac loads
TELEFUNKEN Semiconductors
Rev. A1, 30-May-96
5 (16)
