AN2744 datasheet(22/56 Pages) STMICROELECTRONICS

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Board description

AN2744

22/56

Figure 10

and Figure 11 show the measured response of the filter for both channels, loaded

with the CISPR reference network and with 5

Ω impedance. When loaded with the CISPR

network, the Tx passive filter gives an almost flat gain of nearly 3.5 dB around the

transmission carrier frequency. Applying a heavier load makes the frequency response

sharper and the gain at carrier frequency lower. This effect leads to a loss of about 7-8 dB

with a 5

Ω load for both channels.

Table 5.

Line coupling transformer specifications

Parameter

Value

Turn Ratio

1:1

Magnetizing Inductance

> 1 mH

Leakage Inductance

< 1 µH

DC total resistance

< 0.5

DC saturation current

> 2 mA

Interwinding capacitance

< 50 pF

Withstanding Voltage

4 kV

Figure 10.

Measured frequency response of the Tx passive filter for 72 kHz channel (typical)

-40

-35

-30

-25

-20

-15

-10

-5

1E+04

1E+05

1E+06

Freq (Hz)

CISPR

Ω load

-40

-35

-30

-25

-20

-15

-10

-5

1E+04

1E+05

1E+06

Freq (Hz)

CISPR

Ω load

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