Datasheet

13
Figure 21. Optocoupler input to output capacitance model
for unshielded optocouplers.
Figure 22. Optocoupler input to output capacitance model
for shielded optocouplers.
Figure 23. Equivalent circuit for Figure 17 during common mode transient.
Figure 24. Not recommended open collector drive circuit.
Figure 25. Recommended LED drive circuit for ultra-high CMR IPM
dead time and propagation delay specifications.
1
3
2
4
8
6
7
5
C
LEDP
C
LEDN
1
3
2
4
8
6
7
5
C
LEDP
C
LEDN
SHIELD
C
LEDO1
C
LEDO2
Rg
1
3
V
SAT
2
4
8
6
7
5
+
V
CM
I
LEDP
C
LEDP
C
LEDN
SHIELD
* THE ARROWS INDICATE THE DIRECTION
OF CURRENT FLOW DURING dV
CM
/dt.
+5 V
+
V
CC
= 18 V
0.1
µF
+
1
3
2
4
8
6
7
5
C
LEDP
C
LEDN
SHIELD
+5 V
Q1
I
LEDN
1
3
2
4
8
6
7
5
C
LEDP
C
LEDN
SHIELD
+5 V