IRF840S Datasheet, PDF (6/8 Pages) International Rectifier – Power MOSFET(Vdss=500V, Rds(on)=0.85ohm, Id=8.0A)

IRF840S, SiHF840S
Vishay Siliconix
V_DS
Vary t_p to obtain
required I_AS
R_G
10 V
t_p
L
D.U.T.
I_AS
0.01 Ω
+
- ^{V DD}
Fig. 12a - Unclamped Inductive Test Circuit
V_DS
V_DS
t_p
V_DD
I_AS
Fig. 12b - Unclamped Inductive Waveforms
Fig. 12c - Maximum Avalanche Energy vs. Drain Current
10 V
Q_GS
V_G
Q_G
Q_GD
Charge
Fig. 13a - Basic Gate Charge Waveform
Current regulator
Same type as D.U.T.
12 V
50 kΩ
0.2 µF
0.3 µF
+
D.U.T. - ^VDS
V_GS
3 mA
I_G
I_D
Current sampling resistors
Fig. 13b - Gate Charge Test Circuit
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Document Number: 91071
S-81432-Rev. A, 07-Jul-08