IR1168S - International Rectifier
IR1168S - International Rectifier
IR1168S - International Rectifier
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<strong>IR1168S</strong><br />
Since the device currents are sinusoidal here, the device VDS will cross the V TH1 threshold with a relatively low<br />
dV/dt. Once the threshold is crossed, the current will start flowing again through the body diode, causing the VDS<br />
voltage to jump negative. Depending on the amount of residual current, VDS may once again trigger the turn-on<br />
threshold; hence, VTH2 is blanked for a time duration t BLANK after VTH1 is triggered. When the device VDS<br />
crosses the positive reset threshold VTH3, t BLANK is terminated and the IC is ready for next conduction cycle as<br />
shown below.<br />
I DS<br />
V TH3<br />
V DS<br />
T1<br />
T2<br />
V TH1<br />
V TH2<br />
Gate Drive<br />
Blanking<br />
MOT<br />
t BLANK<br />
time<br />
Figure 2: Secondary currents and voltages<br />
www.irf.com<br />
14<br />
© 2009 <strong>International</strong> <strong>Rectifier</strong>
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