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ACS1086S

Transient voltage protected AC Switch (ACS™)

STMicroelectronics 

ACS108-6S

AC line switch - basic application

Figure 14. Effect of the switching off of a high Figure 15. Description of the different steps

inductive load - typical clamping

during switching off of a high

capability of ACS108-6S

inductive load

I OUT

(5 mA/div)

1

IH

4

3

2

VPEAK = V CL

VOUT

(200 V/div)

I OUT

1

2

IH

5

3

4

VOUT

VCL

5

100µs/div

2.1.2

AC line transient voltage ruggedness

The ACS108-6S switch is able to withstand safely the AC line transients either by clamping

the low energy spikes or by breaking over under high energy shocks, even with high turn-on

current rises.

The test circuit shown in Figure 16 is representative of the final ACS108-6S application, and

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

Thanks to the load limiting the current, the ACS108-6S switch withstands the voltage spikes

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

technology. Actually, the ACS108-6S breaks over safely as shown in Figure 17. The

ACS108-6S 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 line voltage polarity.

Figure 16.

Overvoltage ruggedness test circuit Figure 17.

for resistive and inductive loads

with conditions equivalent to

IEC 61000-4-5 standards

Typical current and voltage

waveforms across the ACS108-6S

during IEC 61000-4-5 standard test

Surge generator

"1.2/50 waveform"

Rgene

2

2.4 kV surge

Model of the load

R

L

150 5µH

ACS108-6Sx

Rg

220

VPEAK

VOUT

(200 V/div)

I OUT

(2 A/div)

200ns/div

7/11

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