ir1168 International Rectifier Corp., ir1168 Datasheet - Page 14

• Manufacturer Part Number: ir1168
• Description: Dual Smart Rectifier Driver Ic
• Manufacturer: International Rectifier Corp.

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Since the device currents are sinusoidal here, the device VDS will cross the V
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
crosses the positive reset threshold VTH3, t
shown below.
Figure 2: Secondary currents and voltages
Gate Drive
Blanking
V
V
V
I
DS
TH1
TH2
DS
T1
BLANK
MOT
is terminated and the IC is ready for next conduction cycle as
14
T2
BLANK
after VTH1 is triggered. When the device VDS
V
TH3
t
BLANK
time
TH1
threshold with a relatively low
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