Vishay 8ETL06FPPbF - Manual (Page 5)

Document Number: 94028 For technical questions, contact: [email protected] www.vishay.com
Revision: 08-Apr-08 5
8ETL06PbF/8ETL06FPPbF
Ultralow V
F
Hyperfast Rectifier for
Discontinuous Mode PFC, 8 A FRED Pt TM
Vishay High Power Products
Fig. 9 - Typical Reverse Recovery Time vs. dI
F
/dt Fig. 10 - Typical Stored Charge vs. dI
F
/dt
Fig. 11 - Reverse Recovery Parameter Test Circuit
Fig. 12 - Reverse Recovery Waveform and Definitions
100 1000
t rr
(ns)
dI
F
/dt (A/µs)
450
0
I
F
= 16 A
I
F
= 8 A
V
R
= 390 V
T
J
= 125 °C
T
J
= 25 °C
400
300
200
100
50
150
250
350
100 1000
Q
rr
(nC)
dI
F
/dt (A/µs)
5000
500
I
F
= 16 A
I
F
= 8 A
3500
2500
1500
1000
V
R
= 390 V
T
J
= 125 °C
T
J
= 25 °C
4500
3000
2000
4000
IRFP250
D.U.T.
L = 70 µH
V
R
= 200 V
0.01 Ω
G
D
S
dI
F
/dt
adjust
Q
rr
0.5 I
RRM
dI
(rec)M
/dt
0.75 I
RRM
I
RRM
t
rr
t
b
t
a
I
F
dI
F
/dt
0
(1)
(2)
(3)
(4)
(5)
(1) dI
F
/dt - rate of change of current
through zero crossing
(2) I
RRM
- peak reverse recovery current
(3) t
rr
- reverse recovery time measured
from zero crossing point of negative
going I
F
to point where a line passing
through 0.75 I
RRM
and 0.50 I
RRM
extrapolated to zero current.
(4) Q
rr
- area under curve defined by t
rr
and I
RRM
t
rr
x I
RRM
2
Q
rr
=
(5) dI
(rec)M
/dt - peak rate of change of
current during t
b
portion of t
rr