+48V, Single-Port Network Power Switch

For Power-Over-LAN

10

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PIN

NAME

FUNCTION

*AGND

Analog Ground. This is the return of analog power input. AGND can vary ±4V from DGND. AGND and

DGND must be connected together at a single point in the system.

1, 2

DRAIN

and open-circuit detection threshold. These two pins must be connected together.

3, 6, 26

N.C.

No Connection. Not internally connected. Leave pins 6 and 26 open. Pins 6 and 26 are left

unconnected to provide additional spacing between the high-voltage pins and other pins.

4IN

Input Voltage. Connect to a positive voltage source between +32V to +60V from IN to AGND. This is

the current-sense resistor positive terminal. Bypass to AGND with a 47µF, 100V electrolytic capacitor

and a 0.1µF, 100V ceramic capacitor. Place the ceramic capacitor close to this pin.

5

RCL

Classification Sense Resistor. Connect a 150

Ω ±1% resistor from RCL to IN for sensing the

classification current. Leave RCL floating when the PD classification function is not used.

7

AGND_S

Analog Ground Sense. Connect a 1

Ω resistor from AGND_S to AGND. This resistor protects the IC

during an output short-circuit condition.

8

UVLO

Undervoltage Lockout Adjustment Input. Referenced to AGND. Connect to the center point of a

resistive-divider from IN to AGND to adjust the UVLO threshold. Leave open for default value.

9

RDT

Detection Sense Resistor. Connect an 18.2k

Ω ±1% resistor from RDT to AGND for sensing the PD

detection current. Add a 680nF capacitor in parallel to this resistor to filter out the power-line noise.

Connect RDT to AGND when the PD detection function is not used.

10

FAULT

Fault Signal Open-Drain Logic Output. Reference to DGND.

FAULT is latched low when:

1. An overtemperature condition occurs and/or,

11

POK

12

ZC

Zero-Current Fault Signal. Open-drain logic output. Reference to DGND.

ZC is latched low when there

detection circuit is enabled immediately after the POK signal goes high. The

ZC is unlatched after a

valid PD has been detected and eventually classified.

13

TP1

Must be Left Open or Connected to AGND

14

TP2

Must be Left Open or Connected to AGND

15

TP3

Must be Left Open or Connected to AGND

16

CL2

Classification Report Logic Output Bit 2. See the PD Classification section (Table 2).

17

CL1

Classification Report Logic Output Bit 1. See the PD Classification section (Table 2).

18

CL0

Classification Report Logic Output Bit 0. See the PD Classification section (Table 2).

19

DGND

Digital Ground. DGND can vary

±4V from AGND. DGND and AGND must to be connected together at

a single point in the system.

20

LATCH

Fault Management Selection Digital Input. Referenced to DGND. Connect to a logic high to latch off

after a fault condition. Connect to a logic low for automatic restart after a fault condition (see the Fault

Management section).

Pin Description

*This is not a device pin.