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SI3452 Scheda tecnica(PDF) 7 Page - Silicon Laboratories

Il numero della parte SI3452
Spiegazioni elettronici  QUAD HIGH-VOLTAGE PORT CONTROLLER FOR POE AND POE PSES
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Produttore elettronici  SILABS [Silicon Laboratories]
Homepage  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI3452 Scheda tecnica(HTML) 7 Page - Silicon Laboratories

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Si3452/3
Rev. 1.0
7
Table 6. VOUT Drive and Power-on Specifications
Description
Symbol
Test Conditions
Min
Typ
Max
Unit
Max output resistance
(port on)
RON
IPort ≤ 720 mA
0.3
0.6
Current limit
ILIM
1x mode, Vport =VEE + 1 V
400
425
450
mA
Change in current limit
I
LIM
1x mode, Vport =VEE + 1V to –30V
1
–2
2
%
Current limit
ILIM
2x mode, Vport =VEE + 1 V
800
860
920
mA
Change in current limit
I
LIM
2x mode, Vport =VEE + 1V to –40V
2
–2
2
%
Current limit
ILIM
1x mode or 2x mode, Vport =–10 V
60
mA
Overload current
threshold
ICUT
Class 0
Class 1 (class policing enabled)3
Class 2 (class policing enabled)3
Class 3
Class 44
350
91
160
350
600
mA
Over current time limit5
TOVLD
Load current
≥ I
CUT or ILIM
50
75
ms
VOUTn turn-on slew
TRISE
10% to 90%
15
70
µs
Power turn on timing
TPON
Time from end of valid detect to
power on
——
400
ms
VOUTn leakage current
IOUT_LEAK
Port in shutdown
10
µA
Notes:
1. TJ >25 °C, –35 V over the full temperature range.
2. 1x mode current limit is enforced during the 60 ms TSTART time.
3. In auto mode, class policing is automatically enabled. In manual mode, ICUT must be programmed manually.
See "5.4. Port Configuration (Registers 0x0A–0x11)" on page 18 for more information.
4. 600 mA is consistent with the IEEE 802.3at draft standard. ICUT is user-programmable in 3.2 mA increments to over
800 mA for non-standard applications.
5. For 2x mode and extreme overload or short-circuit events, TOVLD will dynamically decrease to prevent excessive FET
heating. This is consistent with the 802.3at draft.
Table 7. DC- and dV/dt Disconnect Specifications
Description
Symbol
Test Conditions
Min
Typ
Max
Unit
Load current to prevent
disconnect
ION
10
mA
Load current to
guarantee disconnect
IOFF
dc disconnect
5
mA
dV/dt disconnect
2
mA
Disconnect delay
TDCDV_DLY
Time from IOFF load current to port
turn off
300
400
ms


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