Selection of Isolation Transformer(1) One simple 1:1 iso" />
參數(shù)資料
型號: KS8995XA
廠商: Micrel Inc
文件頁數(shù): 46/51頁
文件大?。?/td> 0K
描述: IC SWITCH 10/100 5PORT 128PQFP
標(biāo)準(zhǔn)包裝: 66
系列: *
類型: *
應(yīng)用: *
安裝類型: 表面貼裝
封裝/外殼: 128-BFQFP
供應(yīng)商設(shè)備封裝: 128-PQFP(14x20)
包裝: 散裝
配用: 576-1604-ND - EVAL KIT EXPERIMENTAL KS8995XA
KS8995XA
Micrel, Inc.
M9999-051305
50
May 2005
Selection of Isolation Transformer(1)
One simple 1:1 isolation transformer is needed at the line interface. An isolation transformer with integrated common-mode
choke is recommended for exceeding FCC requirements. The following table gives recommended transformer characteristics.
Characteristics Name
Value
Test Condition
Turns Ratio
1 CT : 1 CT
Open-Circuit Inductance (min.)
350H
100mV, 100kHz, 8mA
Leakage Inductance (max.)
0.4H
1MHz (min.)
Inter-Winding Capacitance (max.)
12pF
D.C. Resistance (max.)
0.9
Insertion Loss (max.)
1.0dB
0MHz to 65MHz
HIPOT (min.)
1500Vrms
Note:
1. The IEEE 802.3u standard for 100BASE-TX assumes a transformer loss of 0.5dB. For the transmit line transformer, insertion loss of up to 1.3dB can
be compensated by increasing the line drive current by means of reducing the ISET resistor value.
The following transformer vendors provide compatible magnetic parts for Micrel’s device:
4-Port Integrated
Auto
Number
Single-Port
Auto
Number
Vendor
Part
MDIX
of Ports
Vendor
Part
MDIX
of Ports
Pulse
H1164
Yes
4
Pulse
H1102
Yes
1
Bel Fuse
558-5999-Q9
Yes
4
Bel Fuse
S558-5999-U7
Yes
1
YCL
PH406466
Yes
4
YCL
PT163020
Yes
1
Transpower
HB826-2
Yes
4
Transpower
HB726
Yes
1
Delta
LF8731
Yes
4
Delta
LF8505
Yes
1
LanKom
SQ-H48W
Yes
4
LanKom
LF-H41S
Yes
1
Table 12. Qualified Magnetics Lists
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