MAX5922AEUI+【PDF 11/21 页】IC NETWORK PWR SW +48V 28-TSSOP

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Sheet目录43

7页 8页 9页 10页 [11页]12页 13页 14页 15页

+48V, Single-Port Network Power Switch

For Power-Over-LAN

______________________________________________________________________________________ 11

NAME

FUNCTION

ZC_EN

Zero-Current-Detection Enable Logic Input. Referenced to DGND. Connect ZC_EN to a logic high to

enable the zero-current detection circuitry. Connect ZC_EN to a logic low to disable this function.

ON/OFF Control-Logic Input. Referenced to DGND. Connect to a logic high to enable the device.

Connect to a logic low to disable the device and reset a latched-off condition.

DIG

Digital Supply Voltage. V

DIG

is the supply voltage for the internal digital logic circuity. EN, LATCH,

CLASS, DET_DIS, DCA, and ZC_EN input logic thresholds are automatically scaled to the voltage on

DIG

. See the Typical Application Circuit for proper filtering.

CLASS

Classification Enable Digital Input. Connect to DGND to disable the classification function. Connect to

DIG

to enable the classification function.

DET_DIS

PD Detection Disable Logic Input. When DET_DIS is connected to a logic high, the part skips the

detection and classification (regardless of the status of CLASS) phases and powers on immediately

after EN = high (MAX5922B/MAX5922C only).

DCA

Detection Collision Avoidance Logic Input. Connect to a logic high to activate the detection collision

avoidance circuitry for midspan system. Connect to DGND to disable this function. (MAX5922A only).

See the Detection Collision Avoidance section.

27, 28

OUT

Output Voltage

Pin Description (continued)

CLASS

POK

VDIG

LATCH

ZC_EN

DCA

CL2

CL1

CL0

DGND

FAULT

LOGIC-

LEVEL

TRANSLATOR

LOGIC

CONTROL

ANALOG

CONTROL

VOLTAGE

REGULATOR

OSC

DETECTION

AND

CLASSIFICATION

CIRCUITRY

CHARGE

PUMP

CSP

DRAIN

OUT

UVLO

RCL

RDT

AGND

MAX5922

Figure 1. MAX5922 Block Diagram

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