MAX5952CUAX+【PDF 13/50 页】IC PSE CNTRLR FOR POE 36-SSOP

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Sheet目录43

9页 10页 11页 12页 [13页]14页 15页 16页 17页

High-Power, Quad, PSE Controller

for Power-Over-Ethernet

______________________________________________________________________________________ 13

Pin Description (continued)

NAME

FUNCTION

710

A3A0

Address Bits. A3A0 form the lower part of the devices address. Address inputs default high with an

internal 50k& pullup resistor to V

. The address values latch when V

or V

ramps up and exceeds

its UVLO threshold or after a reset. The 3 MSBs of the address are set to 010.

1114

DET1DET4

Detection/Classification Voltage Outputs. Use DET1 to set the detection and classification probe voltages

on port 1. Use DET1 for the AC voltage sensing of port 1 when using the AC disconnect scheme (see the

Typical Operating Circuits).

DGND

Digital Ground. Connect to digital ground.

Positive Digital Supply. Connect to a digital power supply (reference to DGND).

17 20 SHD1SHD4

Port Shutdown Inputs. Pull SHD_ low to turn off the external FET on port_. Internally pulled up to V

with

a 50k& resistor.

AGND

Analog Ground. Connect to the high-side analog supply.

22, 25,

29, 32

SENSE4,

SENSE3,

SENSE2,

SENSE1

MOSFET Source Current-Sense Negative Inputs. Connect to the source of the power MOSFET and

connect a current-sense resistor between SENSE_ and V

(see the Typical Operating Circuits).

23, 26,

30, 33

GATE4,

GATE3,

GATE2,

GATE1

Port_ MOSFET Gate Drivers. Connect GATE_ to the gate of the external MOSFET (see the Typical

Operating Circuits).

24, 27,

31, 34

OUT4, OUT3,

OUT2, OUT1

MOSFET Drain-Output Voltage Senses. Connect OUT_ to the power MOSFET drain through a resistor

(100& to 100k&). The low leakage at OUT_ limits the drop across the resistor to less than 100mV (see the

Typical Operating Circuits).

Low-Side Analog Supply Input. Connect the low-side analog supply to V

(-48V). Bypass with a 1礔

capacitor between AGND and V

AUTO

Auto or Shutdown Mode Input. Force AUTO high to enter auto mode after a reset or power-up. Drive low

to put the MAX5952 into shutdown mode. In shutdown mode, software controls the operational modes of

the MAX5952. A 50k& internal pulldown resistor defaults to AUTO low. AUTO latches when V

or V

ramps up and exceeds its UVLO threshold or when the device resets. Software commands can take the

MAX5952 out of AUTO while AUTO is high.

OSC

Oscillator Input. AC-disconnect detection function uses OSC. Connect a 100Hz ?0%, 2V

P-P

?%, +1.2V

offset sine wave to OSC. If the oscillator positive peak falls below the OSC_FAIL threshold of 2V, the ports

that have the AC function enabled shut down and are not allowed to power-up. When not using the AC-

disconnect detection function, leave OSC unconnected.

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