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AN1645 - APPLICATION NOTE

13/22

Figure 17: Jitter

8. NO LOAD AND LIGHT LOAD OPERATION

When the duty-cycle is lower than 14%, an internal feature of the STSR2P allows a total shutdown of

OUTGate1 and OUTGate2 and of most internal parts of the device, causing a reduction in power

consumption. In these conditions the low output current of the converter is carried by the body diode of

the mosfets. The IC starts to operate again when the Duty-cycle is higher than 18%, therefore having a

4% of hysteresis. This feature allows correct operation when the primary PWM controller imposes burst

mode due to the very light output load.