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LM5072 датащи(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
номер детали LM5072
подробное описание детали  Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux Support
PDF  24 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM5072 датащи(HTML) 11 Page - National Semiconductor (TI)

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Modes of Operation
Per the IEEE 802.3af specification, when a PD is connected
to a PoE system it transitions through several operating
modes in sequence including detection, classification (op-
tional), turn on, normal operation, and power removal. Each
operating mode corresponds to a specific PoE voltage range
fed through the Ethernet cable. Figure 3 shows the IEEE
802.3af specified sequence of operating modes and the
corresponding PD input voltages.
Current steering diode-bridges are required for the PD inter-
face to accept all allowable connections and polarities of
PoE voltage from the RJ-45 connector (see the example
application circuits in Figures 18, 19, 20 and 21). The bridge
will cause some reduction of the input voltage sensed by the
LM5072. To guarantee full compliance to the specification in
all operating modes, the LM5072 takes into account the
voltage drop across the bridge diodes and responds appro-
priately to the voltage received from the PoE cable. Table 1
presents the response in each operating mode to voltages
across the VIN and VEE pins.
TABLE 1. Operating Modes With Respect To Input Voltage
Mode of Operation
Voltage from PoE Cable per
IEEE 802.3af
LM5072 Input Voltage
(V
IN pin to VEE pin)
Detection (Signature)
2.7V to 10.0V
1.5V to 10.0V
Classification
14.5V to 20.5V
12V to 23.5V
Startup
42V max
38V (UVLO Release, V
IN Rising)
Normal Operation
57V to 36V
75V to 32V (UVLO, V
IN Falling)
20184617
FIGURE 3. Sequence of PoE Operating Modes
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