Surge tests

AN4160

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3.3

Test results

Tests results given in this chapter should be understood as follows:

The results, listed by TVS type used and surge level applied, are reported in the following

table.

Based on EN50065-2-3 requirement, it appears that all tested products can protect the PLM

circuitry.

Note that all primary side and receiver side TVS have been chosen to provide the same

actual clamp voltage as in the original EVALKITST7580-1 configuration. This is evident by

comparing the datasheet values.

The following oscilloscope screenshots show a comparison of residual disturbance level

and duration on the two most sensitive points of the PLC coupling circuit, i.e. the transmitted

signal output (PA_OUT) and the received signal input (RX_IN), using both original TVS and

alternative TVS part numbers.

The measurements prove that all the TVS types give equivalent protection to the PLC

device.

Table 3. Surge test result definition

Results

Details

OK

The EUT is still operating and able to communicate after the surge

test, as required by EN50065-2-x.

KO

The EUT is NOT operating and/or able to communicate after the

surge test.

Table 4. Surge test report

TVS

Test results

Primary side

Receiver side

±4 kV level

±6 kV level

1.

EVALKITST7580-1 original configuration

SM6T6V8CA(1)

OK

OK

SMA6J13CA

SMAJ5.0CA

OK

OK

SMAJ13CA

SMAJ5.0CA

OK

OK