H - 7
© 2000 IXYS All rights reserved
Notice
1. A IXBOD element has a maximum reverse
blocking voltage of 10V.
2. For higher reverse voltages a fast, soft recovery
diode must be connected in series (Fig. 9).
This diode must fulfill the conditions of Fig. 10.
T : Thyristor
R
1
: Current limiting resistance (0 - 200 Ω)
D
1
: Series-diode (fast recovery diode)
D
3
: Protection diode
D
4
: Zener diode, typical V
Z
: 3-6 V
R
2
, C
2
: Protection against parasitic triggering;
recommended values:
R
2
: 100 - 1000 Ω
C
2
: 22 - 47 nF
R
3
, C
3
: Snubber network of the thyristor
Example of a circuit
A simple emergency triggering circuit.
Fig. 9 IXBOD protection by a fast recovery
diode.
Fast recovery IXBOD single
diode or
IXBOD module
C
3
T
D
4
D
3
C
2
R
2
IXBOD
D
1
z
R
3
R
1
Fig. 10 Maximum peak value of the
reverse current admissible for a given
pulse-width t
B
, which is required for the
suitable fast recovery series-diode.
I
R
t
B
0,1 µs 1 2 3 5 7 10
I
R
t
B
t
i
40
20
10
8
6
4
2
1
A
