PD69012 datasheet(10/18 Pages) MICROSEMI

10 / 18 page

PD69012 - 12 Ports Power Over Ethernet Manager

Microsemi

Analog Mixed Signal Group

2381 Morse Avenue, Irvine, CA 92614, USA; Phone (USA): (800) 713-4113, (ROW): (949) 221-7100 Fax: (949) 756-0308

Page 10

Rev. 1.0, 2009-03-03

Dynamic Characteristics

The PD69012 utilizes three programmable current level thresholds (Imin, Icut, Ilim) and three timers (Tmin, Tcut, Tlim).

Loads that dissipate more than Icut for longer than Tcut are classified as ‘overloads’ and are automatically shutdown.

Loads that consume Ilim current for more than Tlim are shutdown and classified as 'short circuits'. If the PD69012 is

configured to operate in DC-Disconnect mode and the output power is below Imin for more than Tmin, the PD is

classified as ‘no-load’ and is shutdown. If the PD69012 is configured to operate in AC-Disconnect mode, then if the

load's impedance is above a pre-defined impedance for more than Tmin, the PD is classified as ‘no-load’ and is

shutdown.

Automatic recovery from overload and no-load conditions is attempted every period of TOVLREC and TUDLREC (typically

5 and 1 seconds respectively). Output power is limited to Ilim, which is a maximum peak current allowed at the port.

AF PORTS PARAMETERS

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.

375

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 2.8 Vdc

500

Time Maintain Power Signature

TMPS

DC modulation time for dc disconnect

AC disconnect impedance

Zac

600

2000

KΩ

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