MAX5940A(2003) Ver la hoja de datos (PDF) - Maxim Integrated

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Fabricante

MAX5940A
(Rev.:2003)

IEEE 802.3af PD Interface Controller For Power-Over-Ethernet

Maxim Integrated 

IEEE 802.3af PD Interface Controller

For Power-Over-Ethernet

Typical Application Circuits

Application Circuit 1

RJ-45

POWER-OVER

SIGNAL PAIRS

3

RX

6

1

2

4

TX

5

7

8

VREG

PHY

+

-

GND

+

-

-48V

POWER-OVER

SPAIR PAIRS

DC-DC CONVERTER

GND

60V

-48V

RDISC

25.5kΩ

R1*

68nF

R2*

RCL

V+

1

UVLO

8

GND

2

RCLASS

7

PGOOD

MAX5940B

3 GATE

6

PGOOD

4 VEE

OUT 5

MAX5014

COUT

GND

SS_SHDN

CGATE

*R1 AND R2 ARE OPTIONAL AND WHEN USED, THEY MUST TOTAL 25.5kΩ AND REPLACE THE 25.5kΩ RESISTOR.

VREG

LOAD

Figure 4. PD with Power-Over-Ethernet (Power is Provided by Either the Signal Pairs or the Spare Pairs)

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