IRFR/U3709ZCPbF
Driver Gate Drive
P.W.
Period
D.U.T
Period
D =
P.W.
+
*
=10V
V
GS
Circuit Layout Considerations
• Low Stray Inductance
• Ground Plane
• Low Leakage Inductance
Current Transformer
-
D.U.T. I Waveform
SD
+
-
Reverse
Recovery
Current
Body Diode Forward
Current
-
+
di/dt
D.U.T. V Waveform
DS
Diode Recovery
dv/dt
V
DD
VDD
Re-Applied
Voltage
• dv/dt controlled by RG
RG
+
-
Body Diode
Forward Drop
• Driver same type as D.U.T.
• ISD controlled by Duty Factor "D"
• D.U.T. - Device Under Test
Inductor Curent
I
SD
Ripple
≤ 5%
* VGS = 5V for Logic Level Devices
Fig 15. Peak Diode Recovery dv/dt Test Circuit for N-Channel
HEXFET® Power MOSFETs
Id
Vds
Vgs
Vgs(th)
Qgs1
Qgs2
Qgd
Qgodr
Fig 16. Gate Charge Waveform
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KERSEMI [ Kersemi Electronic Co., Ltd. ]
