PD671XXX-8 Datasheet, PDF (6/14 Pages) Microsemi Corporation – 24-Channel PoE AF and AT DIMM

PD671xxx - 8 / 12 / 24-Channel PoE AF and AT DIMM
Data Sheet (Non-confidential)
Dynamic Characteristics____________
The PD671xxx DIMMs utilize three programmable
current level thresholds (I_min, I_cut, I_lim) and two timers
(T_min, T_cut), to operate as shown in Figure 4. Loads
that consume more than I_cut for longer than T_cut
(OVL_S to OVL) are categorized as ‘overloads’ and
are automatically shutdown. Automatic recovery
from overload and no-load conditions is attempted
every T_OVLREC and T_UDLREC periods (typically 5 and 1
seconds, respectively). Output current is limited to
I_lim, which is the maximum peak current allowed at
each port.
DC Disconnect
Output current consumption below I_min for more
than TPMDO (UDL_S to UDL) is categorized as
‘no-load’ and is shutdown.
AC Disconnect
A port maintains power if Zac < 27 KΩ
A port shutdowns power if Zac > 1980 KΩ for a
time period greater than TPMDO.
PARAMETER
CONDITIONS
Automatic
recovery from
Automatic
recovery from no-
Inrush current
Output current
operating range
Output power
available,
operating range
DC disconnect
OFF mode
AC Disconnect
OFF mode
PD power
maintenance
Over load current
detection range
Over load time
limit
Turn on rise time
Port turn off time
T_OVLREC value, measured from port shutdown
(can be modified via control port)
T_UDLREC value, measured from port shutdown
point (can be modified via control port)
I_Inrsh For t = 50 ms, C_load =180 uF max.
I_port Continuous operation after startup
period
P_port Continuous operation after startup
period, at port output (@ Vport =
57 VDC)
I_min1
I_min2
Zac1
Must disconnect for t greater than T_UVL
May or may not disconnect for t greater
than T_UVL
Does not remove power
Zac2 Remove power
T_{PMD Buffer period to handle transitions}
I_cut
T_OVL
Time limited to T_OVL
Typical timer accuracy is 2 ms
T_rise From 10% to 90% of V_port (specified for
PD load consisting of 100 uF capacitor
Toff From V_port to 5 Vdc
MIN.
10
0.57
0
5
1980
300
660
50
15
TYP. MAX. UNIT
5
s
1
s
750
mA
700
mA
30
W
5
mA
7.5
10
mA
27
KΩ
KΩ
400
ms
680
700
mA
75
ms
us
500
ms
I _lim
I_{c u t}
O VL_S
T _cut
OVL
I_{c h a n n e l}
P o rt 1
P o rt 2
I_{m in}
P o rt o ff
U D L_S
UDL
T _{m in}
Figure 4: Power Limits
Copyright © 2009
Microsemi
Page 6
Rev. 1.0 / 17-March-10
Analog Mixed Signal Group
2381 Morse Avenue, Irvine, CA 92614, USA; Within the USA: [phone], Outside the USA: [phone] Fax: [phone]