DocID028766 Rev 1

17/24

STCH02

Application information

24

3.8

Burst mode operation

operation starts: the MOSFET is turned OFF in order to reduce the consumption. After the

MOSFET turn OFF, the FB pin voltage, as result of the feedback reaction to the energy

an internal clamp inside the current limit circuit. The effect of the burst mode operation is to

reduce the equivalent switching frequency, which can go down even to few hundred hertz,

minimizing all frequency related losses and making it easier to comply with energy saving

regulations.

This kind of operation, shown in the timing diagrams of Figure 10 along with the other ones,

is audible noise free since the peak current is low.

Figure 10. Adaptive minimum restart time: timing diagrams