6

4767B–INDCO–10/05

U2102B

In the case of AC loads, it is necessary to distinguish the power supply purposes of the individ-

ual operating modes. In reverse phase control mode (see Figure 3-1 on page 5), 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

has therefore only one mains half-wave. R

Figure 3-2.

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 3-1 on

page 5, by omitting R

should be as low as the power dissipation allows it. A sufficiently large residual phase angle

must remain in this case to guarantee the device’s supply.

The power supply is simplified if the device is operated as a static zero-voltage switch for AC

loads (see Figure 3-2). All delay times are then twice as long, since the synchronization of the

module is connected directly to the AC line.

R

1max

0.85

V

Nmin

V

S

–

2I

tot

×

----------------------------

×

=

Voltage

limitation

Temp.

monit.

Push

pull

Sync.

16

15

14

13

GND

Load

IGBT

R

1

V

mains

R

sh

R

G

C

1

D

1

R

syn

+V

S