ACS108-8TN

Alternating current mains switch - basic

application

DocID029064 Rev 1

9/14

2.1.2

Alternating current mains transient voltage ruggedness

The ACS108-8TN switch is able to withstand safely the AC mains transients either by

clamping the low energy spikes or by breaking-over when subjected to high energy shocks,

even with high turn-on current rises.

The test circuit shown in Figure 18 is representative of the final ACS108-8TN application,

and is also used to test the AC switch according to the IEC 61000-4-5 standard conditions.

Thanks to the load limiting the current, the ACS108-8TN switch withstands the voltage

spikes up to 2 kV above the peak mains voltage. The protection is based on an overvoltage

crowbar technology. Actually, the ACS108-8TN breaks over safely as shown in Figure 19.

The ACS108-8TN recovers its blocking voltage capability after the surge (switch off back at

the next zero crossing of the current).

Such non-repetitive tests can be done 10 times on each AC mains voltage polarity.

(conditions equivalent to IEC 61000-4-5 standard)

= 18 μF.

OUT

COM

GATE

Filtering unit

Rgenerator

Model of the load

L

R

Rg

Surge generator

Cc