Ethernet Transformer Characteristics; Bill Of Materials (Critical Components); Ethernet Led Buffer Schematic - Novatel OEM6 Series User Manual

Turns ratio
Open-CCT inductance (minimum)
Leakage inductance (maximum)
Inter-winding capacitance (minimum)
DC resistance (maximum)
Insertion loss (maximum)
HIPOT (minimum)
FFB100, FB101, FB102 TDK
U100
U101, U102
C105, C106, C107
The OEM628 Ethernet LED control lines must be buffered. The buffer structure in the figure below shows
a sample LED drive circuit. Do not use the Ethernet bias 3.3 V (P1502, pins 3 and 6) to drive the LEDs.
The Ethernet bias should only be routed to the Ethernet magnetics.
CHN_ETH_LED_A
P1502, pin 7
Link/Act Indicator
136
Table 28: Ethernet Transformer Characteristics
Parameter
Table 29: Bill of Materials (critical components)
Designator Manufacturer
Halo
Semtech
Bourns
OnSemi
AVX
Figure 68: Ethernet LED Buffer Schematic
3V3
R100
10K-1%
Q100
MMBT2907A
R101
R102
10K-1%
220
D
Value
1 CT : 1 CT
350 uH
0.4 uH
12 pF
0.9 Ω
1.0 dB
1500 Vrms
Manufacturer Part Number
MMZ1005B800C
TG110-E050N5RL
LC03-6.TBT
CDNBS08-PLC03-6
LC03-6R2G
1206GC102KAT1A
CHN_ETH_LED_B
P1502, pin 8
D100
Green
OEM6 Family Installation and Operation User Manual Rev 7
Test Condition
100 mV, 100 kHz, 8 mA
1 MHz (minimum)
0 MHz – 65 MHz
3V3
R103
10K-1%
Q101
MMBT2907A
R104
R105
10K-1%
220
100BT Indicator
D
D101
Yellow