IL410/ IL4108

Document Number 83627

Rev. 1.4, 26-Apr-04

Vishay Semiconductors

www.vishay.com

7

Technical Information

Commutating Behavior

The use of a triac at the output creates difficulties in

commutation due to both the built-in coupled thyristor

systems. The triac can remain conducting by parasitic

triggering after turning off the control current. How-

ever, if the IL410/4108 is equipped with two separate

thyristor chips featuring high dv/dt strength, no RC cir-

cuit is needed in case of commutation.

Current commutation:

The values 100 A/ms with following peak reverse

recovery current > 80 mA should not be exceeded.

Avoiding high-frequency turn-off current

oscillations:

This effect can occur when switching a circuit. Current

oscillations which appear essentially with inductive

loads of a higher winding capacity result in current

commutation and can generate a relatively high peak

reverse recovery current. The following alternating

protective measures are recommended for the indi-

vidual operating states:

Note: Measures 2 to 3 are especially required for the load sepa-

rated from the IL410/ IL4108 during operation. The above men-

tioned effects do not occur with IL410/ IL4108 circuits which are

Figure 12. Typical Static Inhibit Voltage Limit

iil410_12

Device zero voltage

switch can be triggered

only in hatched area

below Tj curves.

Figure 13. 1- Apply a Capacitor to the Supply Pins at the Load-Side

Figure 14. 2 - Connect a Series Resistor to the Output and Bridge

Both by a Capacitor

Figure 15. 3 - Connect a Choke of Low Winding Cap. in Series,

e.g., a Ringcore Choke, with Higher Load Currents

iil410_13

0.1

µF

220 V~

1

2

3

6

5

4

iil410_14

22 nF

220 V~

2

1

3

5

6

4

33

Ω

iil410_15

22 nF

220 V~

1

2

3

5

4

6

500

µH