KSZ8041NL/RNL
8.0
SELECTION OF ISOLATION TRANSFORMER
A 1:1 isolation transformer is required at the line interface. An isolation transformer with integrated common-mode
chokes is recommended for exceeding FCC requirements.
Table 8-1 gives the recommended transformer characteristics.
TABLE 8-1:
TRANSFORMER SELECTION CRITERIA
Parameter
Value
Test Condition
Turns Ratio
1 CT : 1 CT
350 H
0.4 H
—
Open-Circuit Inductance (minimum)
Leakage Inductance (maximum)
Inter-Winding Capacitance (typical)
DC Resistance (typical)
100 mV, 100 kHz, 8 mA
1 MHz (minimum)
12 pF
—
0.9
—
0 MHz – 65 MHz
—
Insertion Loss (maximum)
HIPOT (minimum)
1.0 dB
1500 VRMS
TABLE 8-2:
QUALIFIED SINGLE PORT MAGNETICS
Magnetic Manufacturer
Part Number
Auto MDI-X
Number of Ports
Bel Fuse
S558-5999-U7
SI-46001
SI-50170
LF8505
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
1
1
1
1
1
1
1
1
1
Bel Fuse (Mag Jack)
Bel Fuse (Mag Jack)
Delta
LanKom
LF-H41S
H1102
Pulse
Pulse (low cost)
Transpower
TDK (Mag Jack)
H1260
HB726
TLA-6T718
DS00002245B-page 50
2017 Microchip Technology Inc.
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