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SI3461-E01-GM

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
Si3461
Rev. 1.0 7
2.1. Si3461-EVB Performance Characteristics
When implemented according to the recommended external component and layout guidelines for the Si3461-EVB,
the Si3461 enables the following performance specifications in single-port PSE applications. Refer to the Si3461-
EVB User's Guide and schematics for details.
Table 4. Selected Electrical Specifications (Si3461-EVB)
Description
Symbol Test Conditions Min
Typ
1
Max Unit
Power Supplies
V
IN
Input Supply
Range
V
IN
–40 to +85 °C
ambient range
45 50 57 V
V
IN
Input UVLO
Voltage
UVLO UVLO turn-off
voltage at V
IN
— 4245 V
V
IN
Input OVLO
Voltage
OVLO OVLO turn-off
voltage at V
IN
57 60 — V
VDD Supply Voltage
Range
V
DD
Si3461 supply
voltage range
3.15 3.3 3.45 V
Output Supply
Voltage
V
OUT
PSE output
voltage at V
IN
= 50 V and
I
OUT
= 350 mA
—49—V
Supply Current I
IN
Current into the V
DD
node
(not including shunt regulator)
— 8.0 10.5 mA
Detection Specifications
Detection Voltage V
DET
Detection point 1
Detection point 2
Detection point 3
—4.0
8.0
4.0
—V
Detection Current I
DET
Short circuit — — 3 mA
Minimum Signature
Resistance
R
DETmin
15 17 19 k
Maximum Signature
Resistance
R
DETmax
26.5 29 33 k
Classification Specifications
Classification Voltage V
CLASS
0mA < I
CLASS
< 45 mA 15.5 — 20.5 V
Classification Cur-
rent Limit
I
CLASS
Measured with 100
across V
OUT
55 75 95 mA
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 13.
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.
Si3461
8 Rev. 1.0
Classification
Current Region
I
CLASS
_
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 Voltage V
MARK
78.510V
Mark Current I
MARK_LIM
Short circuit — — 9 mA
Protection and Current Control
Overload Current
Threshold
2,3
I
CUT
Class 0 and
Class 4 PoE
15,400/V
OUT
16,170/V
OUT
17,600/V
OUT
mA
Class 1 4,000/V
OUT
4,200/V
OUT
4,600/V
OUT
mA
Class 2 7,000/V
OUT
7,350/V
OUT
8,000/V
OUT
mA
Class 3 15,400/V
OUT
16,170/V
OUT
17,600/V
OUT
mA
Class 4 PoE+ 30,000/V
OUT
31,500/V
OUT
34,200/V
OUT
mA
Overload Current
Limit
4
I
LIM
Class 0/1/2/3 and Class 4
PoE; Output = 100 across
V
OUT
400 425 450 mA
I
LIM
PoE+
Class 4 PoE+; Output = 50
across V
OUT
684 750 825 mA
Overload Time T
LIM
Class 0/1/2/3 and Class 4
PoE; Output = 100 across
V
OUT
50 60 75 ms
Class 4 PoE+;
Output = 50 across V
OUT
14 17 20 ms
Disconnect Current I
MIN
Disconnect current 5 7.5 10 mA
Efficiency
System Efficiency
(P
IN
@ V
IN
) to
(P
OUT
@ V
OUT
)
—
93
—
%
Table 4. Selected Electrical Specifications (Si3461-EVB) (Continued)
Description
Symbol Test Conditions Min
Typ
1
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 13.
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.
Si3461
Rev. 1.0 9
2.2. PSE Timing Characteristics
When implemented in accordance with the recommended external components and layout guidelines, the Si3461
controller enables the following typical performance characteristics in single-port PSE applications. Refer to the
Si3461-EVB applications note, schematics, and user's guide for more details.
Table 5. PSE Timing
Description Symbol Test Conditions Min Typ Max Unit
Endpoint Detection
Delay Cycle
t
DET_CYCLE
Time from PD connection to port to
completion of detection process.
90
—
460 ms
Detection Time
t
DETECT
Time required to measure PD
signature resistance.
—
90
—
ms
Classification Delay
Cycle
t
CLASS_CYCLE
Class 0/1/2/3;
Time from successful detect mode
to classification complete.
—
60
—
ms
Class 4, two event classification;
Time from successful detect mode
to classification complete.
—
99
—
ms
Classification Time
t
CLASS
Class 0/1/2/3 and Class 4 PoE;
—
30
—
ms
Class 4 PoE+
—
69
—
ms
Power-Up Turn-On
Delay
t
PWRUP
Class 0/1/2/3 and Class 4 PoE;
Time from when a valid detection is
completed until V
OUT
power is
applied
—
76
—
ms
Class 4 PoE+;
Time from when a valid detection is
completed until V
OUT
power is
applied
—
112
—
ms
Midspan Detect Back-
off Time
t
BOM
2.0
— —
s
Error Delay Time
T
ed
Time from error to restart of detec-
tion in auto-restart mode.
2.0
— —
s
Disconnect Delay
t
DC_DIS
—
350
—
ms
Note: These typical specifications are based on an ambient operating temperature of 25 °C and V
IN
=+50V.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

SI3461-E01-GM

Mfr. #:
Buy SI3461-E01-GM
Manufacturer:
Silicon Labs
Description:
Power Switch ICs - POE / LAN Single-port PoE / PoE+ PSE interface
Lifecycle:
New from this manufacturer.
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