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