AN1379

Fast transient immunity tests

Doc ID 8317 Rev 5

5/10

Figure 6.

Line to neutral voltage during 2 kV burst with mains filter

2.2

ACS / Triac comparison

The tests are carried out in the following conditions:

chosen in order not to reduce dI/dt rates in case of firing)

470 ohm resistor (to be free of spurious firings coming from the microcontroller)

duration, 3 Hz burst frequency, 5 kHz spike frequency, one second test duration).

Figure 7.

Mains filter for IEC 61000-4-4 test

584 V

584 V

0.47 µ F

X2

2.5 nF

Y2

2.5 nF

Y2

2 x 1 mH

680 k

L

N

Mains filter

Reference plane

10 cm

Burst

generator

A2

Rg

100 pF

100 pF

100 pF

GND