PD69012 Datasheet, PDF (10/18 Pages) Microsemi Corporation – 12 Ports Power Over Ethernet Manager

PD69012 - 12 Ports Power Over Ethernet Manager
Dynamic Characteristics
The PD69012 utilizes three programmable current level thresholds (I_min, I_cut, I_lim) and three timers (T_min, T_cut, T_lim).
Loads that dissipate more than I_cut for longer than T_cut are classified as ‘overloads’ and are automatically shutdown.
Loads that consume I_lim current for more than T_lim are shutdown and classified as 'short circuits'. If the PD69012 is
configured to operate in DC-Disconnect mode and the output power is below I_min for more than T_min, 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 T_min, the PD is classified as ‘no-load’ and is
shutdown.
Automatic recovery from overload and no-load conditions is attempted every period of T_OVLREC and T_UDLREC (typically
5 and 1 seconds respectively). Output power is limited to I_lim, 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 TUDLREC value, measured from port shutdown
shutdown
(can be modified through control port)
Cutoff timers accuracy
Typical accuracy of Tcut
4
Inrush current
IInrsh
For t=50 ms, Cload=180 uF max.
400
Output current operating range Iport
Continuous operation after startup period.
10
Output power available,
operating range
Pport
Continuous operation after startup period,
at port output.
0.57
Off mode current
Imin1
Must disconnect for t greater than TUVL
0
Imin2
May or may not disconnect for t greater
than TUVL
5
PD power maintenance request
drop-out time limit
TPMDO
Buffer period to handle transitions
300
Over load current detection range Icut
Time limited to TOVL
350
Over load time limit
TOVL
50
Turn on rise time
Trise
From 10% to 90% of Vport
(Specified for PD load consisting of 100 uF 15
capacitor in parallel to 200 Ω).
Turn off time
Toff
From Vport to 2.8 Vdc
Time Maintain Power Signature TMPS
DC modulation time for dc disconnect
AC disconnect impedance
Zac
27
5
s
1
s
2
0
ms
450 mA
375 mA
15.4
W
5
mA
7.5
10
mA
400 ms
400 mA
75
ms
us
500 ms
49
ms
600
2000 KΩ
Copyright © 2009
Rev. 1.0, 2009-03-03
Microsemi
Analog Mixed Signal Group
2381 Morse Avenue, Irvine, CA 92614, USA; Phone (USA): [phone], (ROW): [phone] Fax: [phone]
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