SI3452 SILABS [Silicon Laboratories], SI3452 Datasheet - Page 7

• Manufacturer Part Number: SI3452
• Description: QUAD HIGH-VOLTAGE PORT CONTROLLER FOR POE AND POE+ PSES
• Manufacturer: SILABS [Silicon Laboratories]

Table 7. DC- and dV/dt Disconnect Specifications
Table 6. VOUT Drive and Power-on Specifications
Description
Load current to prevent
disconnect
Load current to
guarantee disconnect
Disconnect delay
Description
Max output resistance
(port on)
Current limit
Change in current limit
Current limit
Change in current limit
Current limit
Overload current
threshold
Over current time limit
VOUTn turn-on slew
Power turn on timing
VOUTn leakage current
Notes:
1. T
2. 1x mode current limit is enforced during the 60 ms T
3. In auto mode, class policing is automatically enabled. In manual mode, I
4. 600 mA is consistent with the IEEE 802.3at draft standard. I
5. For 2x mode and extreme overload or short-circuit events, T
See "5.4. Port Configuration (Registers 0x0A–0x11)" on page 18 for more information.
800 mA for non-standard applications.
heating. This is consistent with the 802.3at draft.
J
>25 °C, –35 V over the full temperature range.
5
I
OUT_LEAK
Symbol
T
T
T
T
I
I
R
I
I
I
I
OVLD
CUT
RISE
LIM
LIM
LIM
PON
Symbol
DCDV_DLY
ON
LIM
LIM
I
I
OFF
ON
1x mode, V
2x mode, V
1x mode or 2x mode, V
Class 1 (class policing enabled)
Class 2 (class policing enabled)
Time from I
Time from end of valid detect to
1x mode, V
2x mode, V
Load current ≥ I
Test Conditions
Port in shutdown
Rev. 1.0
I
port
port
Test Conditions
dV/dt disconnect
Port
START
10% to 90%
dc disconnect
power on
OFF
Class 4
Class 0
Class 3
= V
= V
≤ 720 mA
port
port
turn off
time.
load current to port
EE
EE
CUT
OVLD
= V
= V
CUT
+ 1 V to –30 V
+ 1 V to –40 V
4
is user-programmable in 3.2 mA increments to over
EE
EE
will dynamically decrease to prevent excessive FET
port
or I
+ 1 V
+ 1 V
= –10 V
LIM
CUT
3
3
must be programmed manually.
1
2
Min
400
800
350
160
350
600
Min
300
–2
–2
60
91
50
15
—
—
—
10
—
—
Typ
425
860
Typ
0.3
70
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Si3452/3
Max
Max
450
920
400
400
0.6
75
10
—
—
—
—
—
—
—
—
2
2
5
2
Unit
Unit
mA
mA
mA
mA
mA
mA
ms
ms
µA
mA
ms
µs
%
%
Ω
7