Operation description

SRK2001

10/22

DocID027367 Rev 3

Figure 5. Typical waveforms

Figure 6 shows the effect of this parasitic capacitance: in case at the reduced load

a capacitive current spike should trigger the turn-on, there would be a current inversion

(flowing from the output capacitor toward the SR MOSFET) causing a discharge of the

output capacitor and consequently a necessary increase of the rms rectified current, in

order to balance that discharge and this, in turn, would impair efficiency too. Therefore, the

adaptive turn-on delay is aimed to maximize the efficiency in each load operating condition.

Figure 6. Capacitive current spike effect at turn-on