U2102B Datasheet, PDF (5/16 Pages) TEMIC Semiconductors – Multifunction Timer

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, R₁, is connected before the rectifier bridge and
therefore has only one mains half-wave. R₁ is then calcu-
lated as follows:
+ @ _@ R_1max
0.85
V_Nmin –V_S
2 I_tot
R_sync
D₁
Load
V_mains
Sync.
16
R₁
+V_S
15
Voltage
limitation
Push
C₁
pull
14
R_G
IGBT
Figure 4.
Power supply in reverse phase
control mode for ac loads
Temp.
monit.
GND
13
95 9883
In two-wire systems, the additional power supply at
Pin 15 is not possible (see figure 4, by omitting R₁ and
Diode D₁). In this case, the resistor R_sync is identical with
R₁ 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.
R_sh
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.
Sync.
R₁= R_sync
16
+V_S
15
Voltage
limitation
Push
C₁
pull
14
R_G
Temp.
monit.
GND
13
95 9884
IGBT
R_sh
Load
V_mains
Figure 5.
Power supply as static zero
voltage switch for ac loads
TELEFUNKEN Semiconductors
Rev. A1, 30-May-96
5 (16)