AN3213 datasheet(31/64 Pages) STMICROELECTRONICS

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AN3213

ST7570 demonstration board description

Doc ID 17429 Rev 1

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In Figure 21 the measured response of the whole transmission coupling, loaded with the

LISN impedance as set by the EN50065-1 document, is given. The image highlights a

further filtering effect added by the passive L-C series resonant combined with the LISN

reactive load.

Figure 21.

Measured frequency response of the Tx active + passive filter loaded with

the EN50065-1 LISN impedance (typical)

Figure 22 represents the Montecarlo simulation of the cumulated response of transmission

active and passive filters, loaded with the LISN impedance, as set by the EN50065-1

document (References 3). Due to the response slope and the effect of power components,

the in-band variation is within +/-1.5 dB.

Table 5.

Line coupling transformer specifications

Parameter

Value

Turn ratio

1:1

Shunt inductance

≥ 1 mH

Leakage inductance

≤ 1.5 µH

DC total resistance

≤ 0.5 Ω

DC saturation current

≥ 15 mA

Inter-winding capacitance

< 30 pF

Withstanding voltage

≥ 4 kV

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