IRFP4227PbF
Driver Gate Drive
P.W.
P.W.
Period
Period
D =
D.U.T
+
*
=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
• di/dt controlled by RG
RG
+
-
Body Diode
Inductor Current
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 18. Diode Reverse Recovery Test Circuit for N-Channel HEXFET® Power MOSFETs
V
(BR)DSS
15V
t
p
DRIVER
+
L
V
DS
D.U.T
AS
R
G
V
DD
-
I
A
V
20V
GS
0.01Ω
t
p
I
AS
Fig 19b. Unclamped Inductive Waveforms
Fig 19a. Unclamped Inductive Test Circuit
Id
Vds
Vgs
L
VCC
DUT
Vgs(th)
0
1K
Qgs1
Qgs2
Qgd
Qgodr
Fig 20a. Gate Charge Test Circuit
Fig 20b. Gate Charge Waveform
6
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