List of figures

Figure 1.

Block diagram .................................................................... 3

Figure 2.

Typical application.................................................................. 3

Figure 3.

Pin connection (top view) ............................................................. 4

Figure 4.

Control loop connections ............................................................ 10

Figure 5.

Left key waveforms of the circuit in figure 4 ............................................... 11

Figure 6.

Right key waveforms of the circuit in figure 4 .............................................. 11

Figure 7.

OFF-time modulator - details ......................................................... 13

Figure 8.

Left OFF-time modulator timing – Line cycle time scale ....................................... 13

Figure 9.

Right OFF-time modulator timing – Switching cycle time scale .................................. 13

Figure 10.

Embedded high voltage start-up circuitry ................................................. 14

Figure 11.

Soft-start circuitry details ............................................................ 15

Figure 12.

External Burst-Mode (EBM) function – circuit details ......................................... 16

Figure 13.

External Burst-Mode (EBM) function – timing .............................................. 16

Figure 14.

DISABLE function – circuit details ...................................................... 17

Figure 15.

DISABLE function – timing ........................................................... 17

Figure 16.

OVP timing ..................................................................... 18

Figure 17.

OCP2 timing..................................................................... 19

Figure 18.

SO-8 package dimensions ........................................................... 20

L4985

List of figures

DS13769 - Rev 3

page 26/27