Semiconductor Group

9

SLB 0587

Application Circuit (Figure 4)

The suggested circuit design of the SLB 0587 performs the following functions:

q

q

Filtered signal for synchronization of the internal time base (PLL circuit) with line frequency

q

4

provement of interference immunity of the internal PLL against line voltage spikes.

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– Start-up behaviour of internal PLL after line failure

– Ripple control behaviour (periodic shifts of lamp brightness if ripple control signals

represent)

q

q

q

Both resistors can be omitted if no extension is connected. In this case pin 6 must be con-

q

D3: Reduction of positive voltages which may arise during the triggered state at the gate of

diode D3 can be omitted.

q

Dr,

Depending on the application the EMI suppression is to be dimensioned in acc. with

VDE 0875/part 1 (general)

VDE 0550/part 6 (chokes)

or corresponding the national regulations e.g. 1.4....2 mH, Q = 11....24