SI3460 Silicon Laboratories, SI3460 Datasheet - Page 8

• Manufacturer Part Number: SI3460
• Description: IEEE 802.3af PSE INTERFACE AND DC-DC CONTROLLER
• Manufacturer: Silicon Laboratories

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Si3460
4. Si3460-EVB Performance Characteristics
When implemented in accordance with the recommended external components and layout guidelines, the Si3460
controller enables the following typical performance characteristics in single-port PSE applications. Refer to the
Si3460-EVB applications note, schematics, and user's guide for more details.
8
Protection and Current Control
Overload current threshold
Overload current limit
Overload time
Output power at overload
Disconnect current
Detection Specifications
Detection voltage
Minimum signature
resistance
Maximum signature
resistance
Classification Specifications
Classification voltage
Classification current limit
Classification current
region
Notes:
1. Typical specifications are based on an ambient operating temperature of 25 ºC and V
2. See “4. Si3460-EVB Performance Characteristics” for more details.
3. Absolute classification current limits are programmable.
3
specified.
Parameter
2
I
CLASS_REGION
2
Table 5. PSE Performance Characteristics
R
Symbol
R
V
I
V
DETmax
CLASS
DETmin
CLASS
P
I
T
I
I
CUT
MIN
LIM
DET
LIM
LIM
All class levels
Output = 100 Ω across V
Output = 100 Ω across V
Disconnect current
Detection point 1 (w/ 10 kΩ source)
Detection point 2 (w/ 10 kΩ source)
Detection point 3 (w/ 10 kΩ source)
0 mA < ICLASS < 45 mA
Measured with 200 Ω across V
Preliminary Rev. 0.4
Conditions
Class 0
Class 1
Class 2
Class 3
Class 4
OUT
OUT
OUT
1
15,400/
IN
–20.5
V
26.5
Min
15.4
400
15
55
16
25
35
= +12 V unless otherwise
OUT
50
5
0
8
Typ
340
425
4.5
7.5
4.5
7.5
17
29
60
17
–15.5
Max
400
450
10
19
33
95
13
21
31
45
75
—
5
Unit
mA
mA
mA
mA
mA
mA
mA
mA
mA
kΩ
kΩ
ms
W
V
V
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