IRFR/U540Z
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 17. Peak Diode Recovery dv/dt Test Circuit for N-Channel
HEXFET® Power MOSFETs
RD
VDS
VGS
D.U.T.
RG
+VDD
-
10V
Pulse Width ≤ 1 µs
Duty Factor ≤ 0.1 %
Fig 18a. Switching Time Test Circuit
V
DS
90%
10%
V
GS
t
t
r
t
t
f
d(on)
d(off)
Fig 18b. Switching Time Waveforms
8 / 11
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