U2102B データシートの表示（PDF） - Atmel Corporation

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U2102B

Multifunction Timer IC

Atmel Corporation 

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, R1, is connected to the AC line and

has therefore only one mains half-wave. R1 is then calculated as follows:

R1max

=

0.85 ×

V-----N---m----i-n----–-----V----S-

2 × Itot

Figure 3-2. Power Supply in Reverse Phase Control Mode for AC Loads

Sync.

16

Voltage

limitation

+VS

15

Push

pull

Temp.

monit.

14

GND

13

Rsyn

D1

R1

C1

RG

IGBT

Rsh

Load

Vmains

In two-wire systems, the additional power supply at pin 15 is not possible (see Figure 3-1 on

page 5, by omitting R1 and diode D1). In this case, the resistor Rsync 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 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.

6 U2102B

4767B–INDCO–10/05

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