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SI3462 Datasheet(PDF) 7 Page - Silicon Laboratories

No. de pieza SI3462
Descripción Electrónicos  SINGLE-PORT IEEE 802.3AT POE/POE PSE INTERFACE
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Fabricante Electrónico  SILABS [Silicon Laboratories]
Página de inicio  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI3462 Datasheet(HTML) 7 Page - Silicon Laboratories

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Si3462
Rev. 1.0
7
Classification
Current Region
ICLASS_REGION
Class 0
0
5
mA
Class 1
8
13
mA
Class 2
16
21
mA
Class 3
25
31
mA
Class 4
35
45
mA
Mark Voltage6
VMARK
78.5
10
V
Mark Current6
IMARK_LIM
Short circuit
9
mA
Protection and Current Control
Overload Current
Threshold2,3
ICUT
Class 0 and
Class 4 PoE
15,400/VOUT 16,170/VOUT 17,600/VOUT mA
Class 1
4,000/VOUT
4,200/VOUT
4,600/VOUT
mA
Class 2
7,000/VOUT
7,350/VOUT
8,000/VOUT
mA
Class 3
15,400/VOUT 16,170/VOUT 17,600/VOUT mA
Class 4 PoE+
30,000/VOUT 31,500/VOUT 34,200/VOUT mA
Overload Current
Limit4
ILIM
Class 0/1/2/3 and Class 4
PoE; Output = 100  across
VOUT
400
425
450
mA
ILIM PoE+
Class 4 PoE+; Output = 50 
across VOUT
684
750
825
mA
Overload Time
TLIM
Class 0/1/2/3 and Class 4
PoE; Output = 100  across
VOUT
50
60
75
ms
Class 4 PoE+;
Output = 50  across VOUT
14
17
20
ms
Disconnect Current
IMIN
Disconnect current
5
7.5
10
mA
Efficiency
System Efficiency
(PIN @ VIN) to
(POUT @ VOUT)
93
%
Table 3. Selected Electrical Specifications (Si3462-EVB) (Continued)
Description
Symbol
Test Conditions
Min
Typ1
Max
Unit
Notes:
1. Typical specifications are based on an ambient operating temperature of 25 °C and VIN = +50 V unless otherwise
specified.
2. Absolute classification current limits are configurable. See “5.2. Classification” and "5.3. Power-Up" on page 14.
3. Typical ICUT values are adjusted according to the input voltage to provide power limiting with approximately 5% margin
against the 802.3 requirements. The maximum ICUT values are consistent with the IEEE requirement that Icut
maximum is less than 400 mA at the minimum allowed Vout of 44 V or 684 mA for PoE+ mode at the minimum allowed
Vout of 50 V.
4. Overload current is within limits, typically in less than 1 ms.
5. Classification is optional in some operating modes. Refer to Table 6 for operating modes.
6. Classification Mark is only required for Type 2/Class 4 support


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