DocID024500 Rev 1

7/12

ACS302

AC line switch basic application

2.1

High Inductive switch-off operation

In Figure 17, at the end of the last conduction half-cycle, the load current reaches the

current flows through the avalanche diode D and decreases linearly to zero. During this

(

Figure 18

) and the inductance (up to 10 H). The energy stored can reach about 20 mJ and

is dissipated in the clamping diode section that is especially designed for that purpose.

2.2

AC line transient voltage ruggedness

The ACS302 is able to withstand safely the AC line transient voltages either by clamping the

low energy spikes or by breaking over under high energy shocks.

The test circuit shown in Figure 19 is representative of the final ACS application and is also

used to stress the ACS according to the IEC 61000-4-5 standard conditions. Thanks to the

load, the ACS withstands the voltage spikes up to 2 kV above the peak line voltage. It will

break over safely even on resistive load where the turn on current rise is high as shown in

Figure 20

. Such non repetitive test can be done 10 times on each AC line voltage polarity.

Figure 17. Turn-off operation of the ACS302

with an electro-valve: waveform of the pin OUT

Figure 18. ACS302 switch static characteristic

IH

TCL

VCL

VOUT

IOUT

VOUT

IOUT

VCL

IH