MAX5982CEVKIT#【PDF 13/17 页】EVAL KIT MAX5982C

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IEEE 802.3af/at-Compliant, Powered Device Interface

Controllers with Integrated 70W High-Power MOSFET

I LED =

(in amperes)

Alternatively, the 2EC output also serves as a wall adapt-

er detection output when the MAX5982A/MAX5982B/

MAX5982C are powered by an external wall power

adapter. See the Wall Power Adapter Detection and

Operation section for more information.

Power Mode (Wake Mode)

The MAX5982A/MAX5982B/MAX5982C enter power

mode when V IN rises above the undervoltage-lock-

out threshold (V ON ). When V IN rises above V ON , the

MAX5982A/MAX5982B/MAX5982C turn on the internal

n-channel isolation MOSFET to connect V SS to RTN with

inrush current limit internally set to 53mA when V RTN -

V SS > 7V and 135mA when V RTN - V SS < 7V. The isola-

tion MOSFET is fully turned on when the voltage at RTN

is near V SS and the inrush current is reduced below the

inrush limit. Once the isolation MOSFET is fully turned

on, the MAX5982A/MAX5982B/MAX5982C change the

current limit to 1900mA (typ). The open-drain power-

good output (PG) remains low for a minimum of t DELAY

until the power MOSFET fully turns on to keep the down-

stream DC-DC converter disabled during inrush.

Undervoltage Lockout

The MAX5982A/MAX5982B/MAX5982C operate up to a

60V supply voltage with a turn-on UVLO threshold (V ON )

at 35.4V and a turn-off UVLO threshold (V OFF ) at 31V.

When the input voltage is above V ON , the MAX5982A/

MAX5982B/MAX5982C enter power mode and the inter-

nal MOSFET is turned on. When the input voltage goes

below V OFF for more than t OFF_DLY , the MOSFET turns off.

Sleep and Ultra-Low-Power

Sleep Modes (MAX5982A/MAX5982B)

The MAX5982A/MAX5982B feature a sleep mode, which

pulls PG low while keeping the internal n-channel isola-

tion MOSFET turned on. The PG output is used to dis-

able downstream DC-DC converters reducing the power

consumption of the overall PD system in sleep mode. In

sleep mode, the LED driver output (LED) sources peri-

odic current pulses. The LED current (I LED ) is set by an

external resistor (R SL ); see the Applications Information

section for more information. To enable sleep mode,

apply a falling edge to SL (MAX5982B) or hold SL low for

a minimum of 6 seconds after a falling edge.

An ultra-low-power sleep mode allows the MAX5982A/

MAX5982B to further reduce power consumption while

maintaining the power signature of the standard. The

ultra-low-power sleep enable input ULP is internally

held high with a 50kΩ pullup resistor to the internal 5V

bias of the MAX5982A/MAX5982B. To enable ultra-low-

power sleep sleep mode, set ULP to logic-low and apply

a falling edge to SL (MAX5982B) or hold SL low for a

minimum of 6s (MAX5982A). Apply a falling edge on the

wake-mode enable input ( WK ) to disable sleep or ultra-

low-power sleep mode and resume normal operation.

LED Driver ( MAX5982A/MAX5982B )

The MAX5982A/MAX5982B drive an LED connected

from the output LED to V SS . During sleep mode/ultra-low-

power sleep mode, the LED is driven by current pulses

with the amplitude set by the resistor connected from SL

to V SS . The LED driver current amplitude is program-

mable from 10mA to 20mA using R SL according to the

following formula:

645.75

R SL + 1200

Power-Good Output

An open-drain output (PG) is used to allow disabling

downstream DC-DC converter until the n-channel isola-

tion MOSFET is fully turned on. PG is pulled low to V SS

for a period of t DELAY and until the internal isolation

MOSFET is fully turned on. The PG is also pulled low

during sleep mode and coming out of thermal shutdown.

Thermal-Shutdown Protection

The MAX5982A/MAX5982B/MAX5982C include thermal

protection from excessive heating. If the junction tempera-

ture exceeds the thermal-shutdown threshold of +150 N C,

the MAX5982A/MAX5982B/MAX5982C turn off the internal

power MOSFET, LED driver, and 2EC current sink. When

the junction temperature falls below +120 N C, the devices

enter inrush mode and then return to power mode. Inrush

mode ensures the downstream DC-DC converter is turned

off as the internal power MOSFET is turned on.

Wall Power Adapter Detection and Operation

For applications where an auxiliary power source such

as a wall power adapter is used to power the PD,

the MAX5982A/MAX5982B/MAX5982C feature wall

power adapter detection. The MAX5982A/MAX5982B/

MAX5982C give highest priority to the WAD and smooth-

ly switch the power supply to WAD when it is detected.

Once the input voltage (V DD - V SS ) exceeds the mark

event threshold, the MAX5982A/MAX5982B/MAX5982C

enable wall adapter detection. The wall power adapt-

er is connected from WAD to RTN. The MAX5982A/

MAX5982B/MAX5982C detect the wall power adapter

when the voltage from WAD to RTN is greater than 9V.

When a wall power adapter is detected, the internal

n-channel isolation MOSFET turns off, 2EC current sink

turns on, and classification current is disabled if V IN is in

the classification range.

______________________________________________________________________________________

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