Burst Tests Results; Test Procedure; Test Results Of The Board Without Hardware Modifications; Input Filter Influence - STMicroelectronics STEVAL-IHT005V2 User Manual

UM1631
6.3

Burst tests results

6.3.1

Test procedure

Standard IEC 61000-4-4 tests were implemented. The tests were performed at a frequency
of 100 kHz and power supply voltage of 254 Vrms/50 Hz. Parameters of the spikes:
T = 0.7 ms, T
d
the plate and related polarity (+/-) and the mains wire is mentioned: L+, L-, N+, N-, LN+,
LN-. The board was tested during OFF state (all AC switches were turned OFF).
Protective earth (PE) wire is not connected on the board which is why the couplings with PE
were not tested.
6.3.2

Test results of the board without hardware modifications

The target voltage level of the board immunity against burst spikes was 4 KV without any
influence on the board performance (class A).
MCU STM32F100C4T6B was not disturbed by the burst spikes up to 6 kV (class A). Burst
spikes up to 8 kV caused the MCU to reset but it recovers without external intervention
(class B). Reset procedure did not influence the immunity of the devices with higher
immunity.
Table 4 shows immunity level of the ACS/Triacs against the burst spikes. The immunity is
defined by voltage level of spurious triggering.
STEVAL-IHT005V2 V
T1635H (150 W light bulb load)
ACST16 (150 W light bulb load)
Z0109 (75 W light bulb load)
ACS1 (75 W light bulb load)
ACS2 (150 W light bulb load)
ACS3 (150 W light bulb load)
6.3.3

Input filter influence

A 47 nF, X2 capacitor is implemented as the input filter. To achieve 4 kV immunity against
the burst spikes for all the AC switches, it was necessary to add two other X2 capacitors:
100 nF and 220 nF, as each of them influenced a different type of coupling. These two
capacitors are not included on the STEVAL-IHT005V2 board as only Z0109 was below 4 kV
level.
= 300 ms. All affected couplings were tested. Spikes were applied against
r
Table 4. Immunity level of ACS/Triacs in class A
254 VAC - 50 Hz
IN
DocID024503 Rev 1
Board immunity performances
L+ L- N+
> 8 kV > 8 kV > 8 kV
> 8 kV > 8 kV > 8 kV
4.5 kV 4.1 kV 3.7 kV
7.4 kV 6.7 kV > 8 kV
> 8 kV > 8 kV > 8 kV
> 8 kV > 8 kV > 8 kV
N- LN+ LN-
> 8 kV > 8 kV > 8 kV
> 8 kV > 8 kV > 8 kV
4.6 kV 4.0 kV 3.7 kV
7.1 kV 7.3 kV 7.0 kV
> 8 kV 7.6 kV 7.1 kV
> 8 kV 7.6 kV 7.1 kV
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