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SI3401 Fiches technique(PDF) 6 Page - Silicon Laboratories

No de pièce SI3401
Description  FULLY-INTEGRATED 802.3-COMPLIANT PD INTERFACE AND SWITCHING REGULATOR
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Fabricant  SILABS [Silicon Laboratories]
Site Internet  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI3401 Fiches technique(HTML) 6 Page - Silicon Laboratories

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Si3400/Si3401
6
Rev. 0.9
Table 4. Electrical Characteristics
Parameter
Description
Min
Typ
Max
Unit
VPORT
Detection
2.7
11
V
Classification
14
22
UVLO Turn Off
42
UVLO Turn On
30
36
Transient Surge1
62
79
Input Offset Current
VPORT < 10 V
10
µA
Diode bridge leakage
VPORT = 57 V
25
µA
IPORT Classification2
Class 0
0
4
mA
Class 1
9
12
Class 2
17
20
Class 3
26
30
Class 4
36
44
IPORT Operating Current3
36 V < VPORT < 57 V
2
3.1
mA
Current Limit4
Inrush
130
mA
Operating
350 (Si3400)
470 (Si3401)
525
550
—mA
Hotswap FET On-Resistance +
RSENSE
36 V < VPORT < 57 V
0.5
1.4
Power loss VPORT Threshold
27
30
33
V
Switcher Frequency
350
kHz
Maximum Switcher Duty Cycle5
ISOSSFT connected to
VDD
—50
%
Switching FET On-Resistance
0.3
0.86
Regulated Feedback @ pin FB6
DC Avg.
1.23
V
Regulated Output Voltage Tolerance6
Output voltage tolerance @
VOUT
–5
5
%
Notes:
1. Transient surge defined in IEC60060 as a 1000 V impulse of either polarity applied to CT1–CT2 or SP1–SP2. The
shape of the impulse shall have a 300 ns full rise time and a 50 µs half fall time with 201
Ω source impedance.
2. The classification currents are guaranteed only when recommended RCLASS resistors are used, as specified in
Table 10.
3. IPORT includes full operating current of switching regulator controller.
4. The PD interface includes dual-level input current limit. At turn-on, before the HSO load capacitor is charged, the
current limit is set at the inrush level. After the capacitor has been charged within ~1.25 V of VNEG, the operating
current limit is engaged. This higher current limit remains active until the UVLO lower limit has been tripped or until the
hotswap switch is sufficiently current-limited to cause a foldback of the HSO voltage.
5. See “AN296: Using the Si3400/01 PoE PD Controller in Isolated and Non-Isolated Designs” for more information.
6. Applies to non-isolated applications only (VOUT on schematic in Figure 1).


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