APPLICATION DATA (Cont’d)
Fig. F: TURN-OFF CHARACTERISTICS
V
IL
TRANSISTOR
I
t
STTA9012TV1/2
Turn-on losses :
(in the transistor, due to the diode)
P5 = VR
×
IRM 2 × ( 3 + 2 × S ) × F
6 x dIF ⁄ dt
+ VR
×
IRM × IL × ( S + 2 ) × F
2 x dIF ⁄ dt
I
dI F /dt
DIODE
V
ta tb
t
I RM
dIR /dt
VR
trr = ta + tb S = tb / ta
I
dIF /dt = VR /L
RECTIFIER
OPERATION
V
ta tb
IRM
dI R /dt
trr = ta + tb
S = tb/ta
t
VR
Fig. G: TURN-ON CHARACTERISTICS
IF
dIF /dt
I Fmax
0
t
VF
V Fp
1.1V F
0
VF
t
tfr
Turn-off losses (in the diode) :
P3 = VR
× IRM 2 × S
6 x dIF ⁄ dt
×
F
Turn-off losses :
(with non negligible serial inductance)
P3’ = VR
× IRM 2 × S
6 x dIF ⁄ dt
×F +
L × IRM 2 × F
2
P3,P3’ and P5 are suitable for powerMOSFET and
IGBT
Turn-on losses :
P4 = 0.4 (VFP - VF) . IFmax . tfr . F
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