AN1379 datasheet(5/10 Pages) STMICROELECTRONICS

5 / 10 page

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:

■ Printed circuit board 10 cm above reference plane

■ A mains filter (as described in Figure 7) connected to the mains plug

■ Board embeds four Triacs (or ACSs)

■ Each Triac-A2 (or ACS-OUT) terminal linked to a 25 W light bulb (resistive loads are

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

■ Each gate connected to A1 or COM terminals respectively, for Triac and ACS, through a

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

■ No snubber circuits added across the Triacs or ACSs

■ Ambient temperature 25 °C.

■ Burst generator programmed as required in the IEC 61000-4-4 standard (15 ms burst

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

0.47 µ F

2.5 nF

2 x 1 mH

680 k

Mains filter

Reference plane

10 cm

Burst

generator

100 pF

GND

AN1379 데이터시트(PDF) 5 Page - STMicroelectronics