PD64012 datasheet(4/16 Pages) ETC

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PD64012

12-CHANNEL PoE MANAGER

Electrical Characteristics for Analog I/O Pads

PARAMETER

MIN.

MAX.

UNIT

REMARKS

(continued)

Pin Name

ASICINI, I2CINI

Operating voltage

ADC2p5

Current consumption

-1

µA

Pin Name

IREF

Output voltage

1.21

1.34

With external 24.9 k

Ω resistor to ground

Dynamic Characteristics

The PD64012 is an advanced power-limiting device that uses three programmable current level thresholds (Imin, Icut,

Ilim) and two timers (Tmin, Tcut ), to operate as shown in Figure 2. Loads that dissipate more than Icut for longer than

Tcut (OVL_S to OVL) are classified as overloads and are automatically shutdown. Output power dissipation below

Imin for during more than Tmin (UDL_S to UDL) will be classified as no-load and will also be shutdown. Automatic

recovery from overload and no-load conditions are attempted every TOVLREC and TUDLREC periods (typically 5 and 1

seconds, respectively). In any case, output power is limited to Ilim, which is a maximum peak power allowed at the

port.

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Automatic recovery from

overload shutdown

TOVLREC value, measured from port shutdown

(can be modified through control port)

Automatic recovery from

no-load shutdown

TUDLREC value, measured from port shutdown

(can be modified through control port)

Cutoff timers accuracy

Typical accuracy of Tcut

Inrush current

IInrsh

For t=50 ms, Cload=180 uF max.

400

450

Output current

operating range

Iport

Continuous operation after

startup period.

350

Output power available,

operating range

Pport

Continuous operation after

startup period, at port output.

0.57

15.4

Imin1

Must disconnect for t greater than

TUVL

Off mode current

Imin2

May or may not disconnect for t

greater than TUVL

7.5

PD power maintenance

request drop-out time

limit

TPMDO

Buffer period to handle

transitions

300

400

Over load current

detection range

Icut

Time limited to TOVL

350

400

Over load time limit

TOVL

Turn on rise time

Trise

From 10% to 90% of Vport

(specified for PD load consisting

of 100 uF capacitor in parallel to

200

Ω).

Turn off time

Toff

From Vport to 5 Vdc

500

Thermal Data

Power consumption – the internal power consumption of a single device from the DC input is based on:

Input voltage range………… 44 to 57 VDC

Input current………………… 10 mA typ.; 15 mA max.

www.powerdsine.com

Information in this document subject

06-0003-058 (Rev. 2.8) / 5 August 2004

to change without prior notice.

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